CN107500653A - For high and cold, high altitude localities cement concrete and preparation method thereof - Google Patents

Abstract

The invention discloses a cement concrete used in high-cold and high-altitude regions and a preparation method thereof. 0.4%-0.6% dodecylbenzenesulfonic acid, 1.2%-2% biological glue, 2%-4% early strength agent, 1.8%-2.2% cellulose fiber, 0.8%-1.2% poly It is prepared from ethylene glycol, 0.4%-0.6% initiator, 2%-4% stearic acid, 2%-4% fatty acid and 0.2%-0.4% potassium permanganate. The cement concrete can be used It is used in high-cold and high-altitude areas, and has the characteristics of early strength, early crack resistance, and excellent frost resistance, and its preparation method is relatively simple.

Description

Cement concrete used in high cold and high altitude areas and preparation method thereof

technical field

The invention belongs to the field of building materials, and relates to a cement concrete and a preparation method thereof, in particular to a cement concrete used in high cold and high altitude regions and a preparation method thereof.

Background technique

With the continuous in-depth implementation of my country's western development strategy, the western infrastructure is gradually improving. However, due to the complex and harsh natural environment in western my country, especially the high-altitude and high-altitude areas such as Qinghai, concrete structures in such areas are more likely to be damaged than other areas. In order to prevent the country's finances from being severely damaged due to the safety and service life of concrete structures, it is necessary to pay attention to the durability of concrete in cold and high altitude areas.

Compared with ordinary areas, the alpine and high-altitude areas have longer sunshine hours and larger daily average temperature differences, which can reach 20-30 °C. The regions are more frequent; and the average temperature in the alpine and high altitude regions is low, which affects the cement hydration process, and the concrete strength develops slowly. Introducing small closed air bubbles is a common measure to improve the frost resistance of concrete. Due to the thin atmosphere and low air pressure in high altitude areas, the air-entraining ability of the air-entraining agent decreases, and the stability of the introduced air bubbles is poor. The longer the mixing time, the more serious the loss of air content. However, the simple addition of air-entraining agent cannot effectively improve the frost resistance of concrete. It can be seen that the durability of high-cold and high-altitude concrete is mainly reflected in the frost resistance performance. Previous studies mainly started from several aspects: adding air-entraining agent and water reducing agent; changing the water-binder ratio, cementitious material, fly ash content, sand rate and other indicators; adding other materials as reinforcing phases to improve the concrete’s resistance. Freezing; improve mixing methods, construction methods, etc., but the effect is not satisfactory.

In view of the above problems of the service environment and technical status of concrete in the high cold and high altitude areas, it is urgent to develop a functional concrete with early strength, early crack resistance and good frost resistance for the high cold and high altitude areas.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned shortcoming of prior art, provide a kind of cement concrete and preparation method thereof for high cold and high altitude area, this cement concrete can be used in high cold and high altitude area, and has early strength, early stage It has the characteristics of excellent crack resistance and frost resistance, and the preparation method is relatively simple.

In order to achieve the above object, the cement concrete used in the alpine and high altitude regions according to the present invention is composed of 25% to 40% cement, 25% to 40% river sand, 15% to 20% water, 0.4 %～0.6% dodecylbenzenesulfonic acid, 1.2%～2% biological glue, 2%～4% early strength agent, 1.8%～2.2% cellulose fiber, 0.8%～1.2% polyethylene It is prepared from diol, 0.4%-0.6% initiator, 2%-4% stearic acid, 2%-4% fatty acid and 0.2%-0.4% potassium permanganate.

The bio-glue is prepared by mixing 60%-70% xanthan gum and 30%-40% Brunei gum.

The initiator is prepared by mixing 40%-60% of benzoyl peroxide and 40%-60% of sucrose.

The cement is Portland cement of 42.5 strength grade or Portland cement of 52.5 strength grade;

The fineness modulus of river sand is 2.3-2.8.

The early strength agent is made by mixing 70%-80% of sodium nitrate and 20%-30% of triethanolamine.

The elastic modulus of the cellulose fiber is 8-10GPa, the tensile strength of the cellulose fiber is 500-1000MPa, the length of the cellulose fiber is 2-3mm, and the aspect ratio of the cellulose fiber is 130-150;

The relative molecular weight of polyethylene glycol is 1000-1200, and polyethylene glycol is light white waxy solid.

The fatty acid is a medium-chain fatty acid lauric acid with 12 carbon atoms, and the fatty acid is a saturated fatty acid, the density of the fatty acid is 0.8830 g/mL, and the melting point of the fatty acid is 44°C.

The preparation method of the cement concrete that is used for alpine, high-altitude area of the present invention comprises the following steps:

1) Weighing cement, river sand, water, dodecylbenzenesulfonic acid, biological glue, early strength agent, cellulose fiber, polyethylene glycol, initiator, stearic acid, fatty acid and potassium permanganate;

2) adding cellulose fiber, polyethylene glycol and initiator in sequence to a heated reaction kettle at a temperature of 70-80°C, and then stirring evenly to obtain a mixture A;

3) Add stearic acid, fatty acid and potassium permanganate sequentially into a stirring device at a temperature of 110-120°C, stir evenly and cool to room temperature to obtain mixture B;

4) Mix and stir dodecylpropanesulfonic acid, biological glue, early strength agent and water evenly to obtain dilute solution C;

5) Mix cement, river sand, mixture B and dilute solution C evenly, then add mixture A while stirring, and then stir evenly, it can be used for cement concrete in cold and high altitude areas.

In step 2), the cellulose fiber, polyethylene glycol and initiator are sequentially added into a heating reaction kettle at a temperature of 70-80°C, and then stirred at a speed of 150r/min under normal pressure for 10-15min, Mixture A is obtained.

Stir evenly in step 3) and then cool to room temperature to obtain the mixture B. The specific operation is: stir at a speed of 200 r/min for 10 minutes under normal pressure, and then cool to room temperature to obtain the mixture B.

The present invention has the following beneficial effects:

The cement concrete used in the high cold and high altitude areas of the present invention consists of cement, river sand, water, dodecylbenzenesulfonic acid, biological glue, early strength agent, cellulose fiber, polyethylene glycol, initiator, Stearic acid, fatty acid and potassium permanganate are mixed in a specific way. Among them, dodecylpropanesulfonic acid can introduce a large number of tiny closed air bubbles when mixing concrete. The retention time is short, and the invention thickens the cement concrete with biological glue, thereby forming a film with certain mechanical strength and elasticity around the introduced air bubbles, so as to increase the surface viscosity of the bubble film, thereby increasing the retention rate of the air bubbles. In addition, the cellulose fibers form a three-dimensional network structure inside the concrete, making it more difficult for air bubbles to overflow, thereby releasing the frost heave stress generated by the freeze-thaw cycle. The generation of micro-cracks and the synergistic effect of bio-glue make the concrete more compact; under the action of the initiator, the cellulose fiber can react with polyethylene glycol to make the polyethylene glycol cross-linked and adsorbed on the surface of the cellulose fiber, In this way, a fiber material with temperature regulation similar to phase change materials can be obtained. The fiber material can absorb heat when the temperature rises due to strong sunlight during the day, and keep its own temperature and volume shape unchanged, and release heat when the temperature is cold and negative at night. , so as to effectively improve the concrete freeze-thaw damage caused by the special environment.

In addition, under the catalysis of potassium permanganate, stearic acid and fatty acid are wrapped on the surface of the sand to form a stable substance with SiO ₂ as the core and wrapped with fatty acid molecules. The fatty acid can change phase with the change of temperature. When the temperature is high, it absorbs heat without changing its shape, and when it is low temperature, it slowly releases the temperature. This stable substance can be used as a concrete fine aggregate, and it can also work together with cellulose fibers with polyethylene glycol adsorbed on the surface to regulate. The effect of the internal temperature of concrete can effectively improve the service state of concrete that frequently experiences freeze-thaw cycles in high-cold and high-altitude environments.

In addition, the hydration process of concrete is accelerated by the early strength agent, so that the concrete can form strength earlier, so that the concrete can resist the stress generated in the special environment earlier, and realize early crack resistance, which is beneficial to concrete in cold and high altitude areas. Late growth in strength. Simultaneously owing to along with the quickening of hydration process, cause internal and external temperature gap to be big, thereby produce temperature stress, and then produce micro _- crack in concrete interior, the cellulose fiber that surface is adsorbed with polyethylene glycol in the present invention and take SiO as core, The stable substance wrapped with fatty acid molecules can self-regulate the temperature and absorb part of the heat generated by the addition of accelerators.

To sum up, the present invention effectively improves the freeze-thaw damage phenomenon of concrete in high cold and high altitude areas through the synergistic effect of foam stabilization, early strength, increase of concrete density and self-regulation of concrete internal temperature.

At the same time, in the preparation process of the cement concrete used in high cold and high altitude regions, each raw material can be heated and mixed, and the preparation method is relatively simple.

Description of drawings

Fig. 1 is a comparison result diagram of the crack resistance performance of cement concrete obtained in Comparative Example 1, Embodiment 1, Embodiment 2 and Embodiment 3.

detailed description

The present invention is described in further detail below in conjunction with accompanying drawing:

Comparative example one

Comparative Example 1 selects ordinary cement concrete, which is composed of 30% cement, 21.8% river sand, 40% coarse aggregate, 8% water, 0.1% air-entraining agent and 0.1% water-reducing agent. agent.

Embodiment one

The cement concrete used in the alpine and high-altitude areas of the present invention is characterized in that it is composed of 35% cement, 30% river sand, 16% water, and 0.6% dodecylbenzenesulfonic acid. , 2% biological glue, 4% early strength agent, 2.2% cellulose fiber, 1.2% polyethylene glycol, 0.6% initiator, 4% stearic acid, 4% fatty acid and 0.4% Prepared from potassium permanganate.

The bio-glue is mixed with 65% xanthan gum and 35% Brunei gum.

The initiator is prepared by mixing 55% benzoyl peroxide and 45% sucrose.

The cement is Portland cement of 42.5 strength grade;

The fineness modulus of river sand is 2.5.

The early strength agent is mixed with 80% sodium nitrate and 20% triethanolamine.

The modulus of elasticity of the cellulose fiber is 10GPa, the tensile strength of the cellulose fiber is 1000MPa, the length of the cellulose fiber is 3mm, and the aspect ratio of the cellulose fiber is 150;

The relative molecular weight of polyethylene glycol is 1000, and polyethylene glycol is light white waxy solid.

The fatty acid is a medium-chain fatty acid lauric acid with 12 carbon atoms, and the fatty acid is a saturated fatty acid, the density of the fatty acid is 0.8830 g/mL, and the melting point of the fatty acid is 44°C.

The preparation method of the cement concrete used in the high cold and high altitude areas comprises the following steps:

1) Weighing cement, river sand, water, dodecylbenzenesulfonic acid, biological glue, early strength agent, cellulose fiber, polyethylene glycol, initiator, stearic acid, fatty acid and potassium permanganate;

2) adding cellulose fiber, polyethylene glycol and initiator in sequence to a heated reaction kettle at a temperature of 70° C., and then stirring evenly to obtain a mixture A;

3) Stearic acid, fatty acid and potassium permanganate were sequentially added to a stirring device at a temperature of 110°C, stirred evenly and then cooled to room temperature to obtain a mixture B;

4) Mix and stir dodecylpropanesulfonic acid, biological glue, early strength agent and water evenly to obtain dilute solution C;

5) Mix cement, river sand, mixture B and dilute solution C evenly, then add mixture A while stirring, and then stir evenly, it can be used for cement concrete in cold and high altitude areas.

In step 2), the cellulose fiber, polyethylene glycol and initiator were sequentially added to a heating reaction kettle at a temperature of 70°C, and then stirred at a speed of 150r/min under normal pressure for 15min to obtain a mixture A .

Stir evenly in step 3) and then cool to room temperature to obtain the mixture B. The specific operation is: stir at a speed of 200 r/min for 10 minutes under normal pressure, and then cool to room temperature to obtain the mixture B.

Embodiment two

The cement concrete used in the alpine and high altitude areas of the present invention is composed of 39% cement, 30% river sand, 15% water, 0.4% dodecylbenzenesulfonic acid, 1.2% biological Glue, 3% early strength agent, 1.8% cellulose fiber, 0.8% polyethylene glycol, 0.4% initiator, 4% stearic acid, 4% fatty acid and 0.4% potassium permanganate made.

The bio-glue is made by mixing 60% xanthan gum and 40% Brunei gum.

The initiator is prepared by mixing 55% benzoyl peroxide and 45% sucrose.

The cement is Portland cement of 52.5 strength grade;

The fineness modulus of river sand is 2.5.

The early strength agent is mixed with 70% sodium nitrate and 30% triethanolamine.

The elastic modulus of the cellulose fiber is 8GPa, the tensile strength of the cellulose fiber is 500MPa, the length of the cellulose fiber is 2mm, and the aspect ratio of the cellulose fiber is 130;

The relative molecular weight of polyethylene glycol is 1200, and polyethylene glycol is light white waxy solid.

The fatty acid is a medium-chain fatty acid lauric acid with 12 carbon atoms, and the fatty acid is a saturated fatty acid, the density of the fatty acid is 0.8830 g/mL, and the melting point of the fatty acid is 44°C.

The preparation method of described cement concrete that is used for alpine, high altitude area comprises the following steps:

1) Weighing cement, river sand, water, dodecylbenzenesulfonic acid, biological glue, early strength agent, cellulose fiber, polyethylene glycol, initiator, stearic acid, fatty acid and potassium permanganate;

2) adding cellulose fiber, polyethylene glycol and initiator in sequence to a heated reaction kettle at a temperature of 80° C., and then stirring evenly to obtain a mixture A;

3) Stearic acid, fatty acid and potassium permanganate were sequentially added to a stirring device at a temperature of 120° C., stirred evenly and then cooled to room temperature to obtain a mixture B;

4) Mix and stir dodecylpropanesulfonic acid, biological glue, early strength agent and water evenly to obtain dilute solution C;

5) Mix cement, river sand, mixture B and dilute solution C evenly, then add mixture A while stirring, and then stir evenly, it can be used for cement concrete in cold and high altitude areas.

In step 2), the cellulose fiber, polyethylene glycol and initiator were sequentially added to a heating reaction kettle at a temperature of 80°C, and then stirred at a speed of 150r/min under normal pressure for 10min to obtain a mixture A .

Stir evenly in step 3) and then cool to room temperature to obtain the mixture B. The specific operation is: stir at a speed of 200 r/min for 10 minutes under normal pressure, and then cool to room temperature to obtain the mixture B.

Embodiment Three

The cement concrete used in the alpine and high-altitude areas of the present invention is composed of 40% cement, 30% river sand, 15% water, 0.4% dodecylbenzenesulfonic acid, 1.2% biological Glue, 3% early strength agent, 2.2% cellulose fiber, 1.2% polyethylene glycol, 0.6% initiator, 3% stearic acid, 3% fatty acid and 0.4% potassium permanganate made.

The bio-glue is made by mixing 60% xanthan gum and 40% Brunei gum.

The initiator is prepared by mixing 60% benzoyl peroxide and 40% sucrose.

The cement is Portland cement of 42.5 strength grade or Portland cement of 52.5 strength grade;

The fineness modulus of river sand is 2.5.

The early strength agent is mixed with 75% sodium nitrate and 25% triethanolamine.

The modulus of elasticity of the cellulose fiber is 9GPa, the tensile strength of the cellulose fiber is 800MPa, the length of the cellulose fiber is 25mm, and the aspect ratio of the cellulose fiber is 140;

The relative molecular weight of polyethylene glycol is 1100, and polyethylene glycol is light white waxy solid.

The fatty acid is a medium-chain fatty acid lauric acid with 12 carbon atoms, and the fatty acid is a saturated fatty acid, the density of the fatty acid is 0.8830 g/mL, and the melting point of the fatty acid is 44°C.

The preparation method of the cement concrete that is used for alpine, high-altitude area of the present invention comprises the following steps:

1) Weighing cement, river sand, water, dodecylbenzenesulfonic acid, biological glue, early strength agent, cellulose fiber, polyethylene glycol, initiator, stearic acid, fatty acid and potassium permanganate;

2) adding cellulose fiber, polyethylene glycol and initiator in sequence to a heated reaction kettle at a temperature of 75° C., and then stirring evenly to obtain a mixture A;

3) Stearic acid, fatty acid and potassium permanganate were sequentially added to a stirring device at a temperature of 115°C, stirred evenly and then cooled to room temperature to obtain a mixture B;

4) Mix and stir dodecylpropanesulfonic acid, biological glue, early strength agent and water evenly to obtain dilute solution C;

5) Mix cement, river sand, mixture B and dilute solution C evenly, then add mixture A while stirring, and then stir evenly, it can be used for cement concrete in cold and high altitude areas.

In step 2), the cellulose fiber, polyethylene glycol and initiator were sequentially added into a heating reaction kettle at a temperature of 75° C., and then stirred at a speed of 150 r/min under normal pressure for 13 minutes to obtain a mixture A .

Stir evenly in step 3) and then cool to room temperature to obtain the mixture B. The specific operation is: stir at a speed of 200 r/min for 10 minutes under normal pressure, and then cool to room temperature to obtain the mixture B.

The cement concrete obtained in comparative example one, embodiment one, embodiment two and embodiment three is carried out freeze-thaw cycle test respectively. Put them into a low-pressure curing box with a temperature of 10±2°C and an air pressure of 60kPa for curing until the age of 28 days, and the obtained test parameters are shown in Table 1 and Table 2.

The crack resistance of the cement concrete obtained in the first, second, third and comparative example 1 test using the ring method, because the time for cracks to appear in the concrete is relatively long, in order to accelerate the cracks, the cracks in the first and second examples were combined 1. The coarse aggregate in Example 3 and Comparative Example was removed, the water reducer was adjusted appropriately, and the cement mortar with good properties was used to replace the concrete. The crack resistance test results are shown in Figure 1.

Table 1

Table 2

As can be seen from Table 1 and Table 2, the cement concrete of the present invention undergoes 300 times of freeze-thaw cycles after maintenance in a low-pressure environment, and the loss of dynamic elastic modulus and quality is relatively small, and the relative dynamic elastic modulus can be maintained at About 90%, the quality loss is about 1%. After 300 freeze-thaw cycles, the relative dynamic elastic modulus of ordinary concrete added with air-entraining agent and water-reducing agent drops to about 60%, and the mass loss is close to 5%, which is equivalent to completely losing its function. Big security risk. As can be seen from Figure 1, the present invention has not yet cracked at 55 days, and the induced strain of the steel ring has been very low, indicating that the present invention has excellent crack resistance, can adapt to the special environment and climate of high cold and high altitude areas, and has excellent frost resistance. Good, in summary, the cement concrete of the present invention has a higher ability to withstand various complex stresses in harsh environments, lower maintenance costs in the later period, higher durability and safety factor of the concrete structure, and is suitable for the special environment in the west of the country. The infrastructure construction has practical significance.

Embodiment Four

The cement concrete used in the alpine and high-altitude areas of the present invention is composed of 40% cement, 30% river sand, 15% water, 0.4% dodecylbenzenesulfonic acid, 1.2% biological Glue, 3% early strength agent, 2.2% cellulose fiber, 1.2% polyethylene glycol, 0.6% initiator, 3% stearic acid, 3% fatty acid and 0.4% potassium permanganate made.

The bio-glue is formed by mixing 62% xanthan gum and 38% Brunei gum.

The initiator is prepared by mixing 55% benzoyl peroxide and 45% sucrose.

The cement is Portland cement of 42.5 strength grade;

The fineness modulus of river sand is 2.5.

The early strength agent is mixed with 72% sodium nitrate and 28% triethanolamine.

The modulus of elasticity of the cellulose fiber is 8.5GPa, the tensile strength of the cellulose fiber is 700MPa, the length of the cellulose fiber is 2.25mm, and the aspect ratio of the cellulose fiber is 135;

The relative molecular weight of polyethylene glycol is 1150, and polyethylene glycol is light white waxy solid.

The fatty acid is a medium-chain fatty acid lauric acid with 12 carbon atoms, and the fatty acid is a saturated fatty acid, the density of the fatty acid is 0.8830 g/mL, and the melting point of the fatty acid is 44°C.

The preparation method of described cement concrete that is used for alpine, high altitude area comprises the following steps:

1) Weighing cement, river sand, water, dodecylbenzenesulfonic acid, biological glue, early strength agent, cellulose fiber, polyethylene glycol, initiator, stearic acid, fatty acid and potassium permanganate;

2) Add cellulose fiber, polyethylene glycol and initiator in sequence to a heated reaction kettle at a temperature of 72°C, and then stir evenly to obtain a mixture A;

3) Stearic acid, fatty acid and potassium permanganate were sequentially added to a stirring device at a temperature of 118°C, stirred evenly and then cooled to room temperature to obtain a mixture B;

4) Mix and stir dodecylpropanesulfonic acid, biological glue, early strength agent and water evenly to obtain dilute solution C;

5) Mix cement, river sand, mixture B and dilute solution C evenly, then add mixture A while stirring, and then stir evenly, it can be used for cement concrete in cold and high altitude areas.

In step 2), the cellulose fiber, polyethylene glycol and initiator were sequentially added to a heating reaction kettle at a temperature of 72°C, and then stirred at a speed of 150r/min under normal pressure for 14min to obtain a mixture A .

Stir evenly in step 3) and then cool to room temperature to obtain the mixture B. The specific operation is: stir at a speed of 200 r/min for 10 minutes under normal pressure, and then cool to room temperature to obtain the mixture B.

Embodiment five

The cement concrete used in the alpine and high-altitude areas of the present invention is composed of 28.3% cement, 40% river sand, 20% water, 0.5% dodecylbenzenesulfonic acid, 1.5% biological Glue, 2% accelerator, 2% cellulose fiber, 1% polyethylene glycol, 0.5% initiator, 2% stearic acid, 2% fatty acid and 0.2% potassium permanganate made.

The bio-glue is mixed with 68% xanthan gum and 32% Brunei gum.

The initiator is prepared by mixing 45% benzoyl peroxide and 55% sucrose.

The cement is Portland cement of 52.5 strength grade;

The fineness modulus of river sand is 2.7.

The early strength agent is made by mixing 77% of sodium nitrate and 23% of triethanolamine.

The modulus of elasticity of the cellulose fiber is 9GPa, the tensile strength of the cellulose fiber is 800MPa, the length of the cellulose fiber is 2.5mm, and the aspect ratio of the cellulose fiber is 145;

The relative molecular weight of polyethylene glycol is 1050, and polyethylene glycol is light white waxy solid.

The fatty acid is a medium-chain fatty acid lauric acid with 12 carbon atoms, and the fatty acid is a saturated fatty acid, the density of the fatty acid is 0.8830 g/mL, and the melting point of the fatty acid is 44°C.

The preparation method of described cement concrete that is used for alpine, high altitude area comprises the following steps:

1) Weighing cement, river sand, water, dodecylbenzenesulfonic acid, biological glue, early strength agent, cellulose fiber, polyethylene glycol, initiator, stearic acid, fatty acid and potassium permanganate;

2) Add cellulose fiber, polyethylene glycol and initiator in sequence to a heated reaction kettle at a temperature of 78° C., and then stir evenly to obtain a mixture A;

3) Stearic acid, fatty acid and potassium permanganate were sequentially added to a stirring device at a temperature of 118°C, stirred evenly and then cooled to room temperature to obtain a mixture B;

4) Mix and stir dodecylpropanesulfonic acid, biological glue, early strength agent and water evenly to obtain dilute solution C;

5) Mix cement, river sand, mixture B and dilute solution C evenly, then add mixture A while stirring, and then stir evenly, it can be used for cement concrete in cold and high altitude areas.

In step 2), the cellulose fiber, polyethylene glycol and initiator were sequentially added into a heating reaction kettle with a temperature of 78°C, and then stirred at a speed of 150r/min under normal pressure for 13min to obtain the mixture A .

Stir evenly in step 3) and then cool to room temperature to obtain the mixture B. The specific operation is: stir at a speed of 200 r/min for 10 minutes under normal pressure, and then cool to room temperature to obtain the mixture B.

Embodiment six

The cement concrete used in the alpine and high-altitude areas of the present invention is composed of 25% cement, 40% river sand, 16.9% water, 0.6% dodecylbenzenesulfonic acid, 1.5% biological Glue, 4% early strength agent, 2% cellulose fiber, 1.2% polyethylene glycol, 0.5% initiator, 4% stearic acid, 4% fatty acid and 0.3% potassium permanganate made.

The bio-glue is prepared by mixing 60% xanthan gum and 40% Brunei gum.

The initiator is prepared by mixing 40% benzoyl peroxide and 60% sucrose.

The cement is Portland cement of 52.5 strength grade;

The fineness modulus of river sand is 2.7.

The early strength agent is made by mixing 76% of sodium nitrate and 24% of triethanolamine.

The modulus of elasticity of the cellulose fiber is 8.5GPa, the tensile strength of the cellulose fiber is 600MPa, the length of the cellulose fiber is 2.2mm, and the aspect ratio of the cellulose fiber is 135;

The relative molecular weight of polyethylene glycol is 1180, and polyethylene glycol is light white waxy solid.

The fatty acid is a medium-chain fatty acid lauric acid with 12 carbon atoms, and the fatty acid is a saturated fatty acid, the density of the fatty acid is 0.8830 g/mL, and the melting point of the fatty acid is 44°C.

The preparation method of described cement concrete that is used for alpine, high altitude area comprises the following steps:

1) Weighing cement, river sand, water, dodecylbenzenesulfonic acid, biological glue, early strength agent, cellulose fiber, polyethylene glycol, initiator, stearic acid, fatty acid and potassium permanganate;

2) Add cellulose fiber, polyethylene glycol and initiator in sequence to a heated reaction kettle at a temperature of 72°C, and then stir evenly to obtain a mixture A;

3) Stearic acid, fatty acid and potassium permanganate were sequentially added to a stirring device at a temperature of 110°C, stirred evenly and then cooled to room temperature to obtain a mixture B;

4) Mix and stir dodecylpropanesulfonic acid, biological glue, early strength agent and water evenly to obtain dilute solution C;

5) Mix cement, river sand, mixture B and dilute solution C evenly, then add mixture A while stirring, and then stir evenly, it can be used for cement concrete in cold and high altitude areas.

In step 2), the cellulose fiber, polyethylene glycol and initiator were sequentially added to a heated reaction kettle at a temperature of 72°C, and then stirred at a speed of 150r/min under normal pressure for 12min to obtain a mixture A .

Stir evenly in step 3) and then cool to room temperature to obtain the mixture B. The specific operation is: stir at a speed of 200 r/min for 10 minutes under normal pressure, and then cool to room temperature to obtain the mixture B.

Embodiment seven

The cement concrete used in the alpine and high-altitude areas of the present invention is composed of 40% cement, 25% river sand, 16.9% water, 0.5% dodecylbenzenesulfonic acid, 1.6% biological Glue, 4% early strength agent, 2% cellulose fiber, 1.2% polyethylene glycol, 0.5% initiator, 4% stearic acid, 4% fatty acid and 0.3% potassium permanganate made.

The bio-glue is made by mixing 70% xanthan gum and 30% Brunei gum.

The initiator is prepared by mixing 40% benzoyl peroxide and 60% sucrose.

The cement is Portland cement of 52.5 strength grade;

The fineness modulus of river sand is 2.8.

The early strength agent is mixed with 70% sodium nitrate and 30% triethanolamine.

The modulus of elasticity of the cellulose fiber is 10GPa, the tensile strength of the cellulose fiber is 1000MPa, the length of the cellulose fiber is 3mm, and the aspect ratio of the cellulose fiber is 150;

The relative molecular weight of polyethylene glycol is 1200, and polyethylene glycol is light white waxy solid.

The fatty acid is a medium-chain fatty acid lauric acid with 12 carbon atoms, and the fatty acid is a saturated fatty acid, the density of the fatty acid is 0.8830 g/mL, and the melting point of the fatty acid is 44°C.

The preparation method of described cement concrete that is used for alpine, high altitude area comprises the following steps:

1) Weighing cement, river sand, water, dodecylbenzenesulfonic acid, biological glue, early strength agent, cellulose fiber, polyethylene glycol, initiator, stearic acid, fatty acid and potassium permanganate;

2) adding cellulose fiber, polyethylene glycol and initiator in sequence to a heated reaction kettle at a temperature of 80° C., and then stirring evenly to obtain a mixture A;

3) Stearic acid, fatty acid and potassium permanganate were sequentially added to a stirring device at a temperature of 120° C., stirred evenly and then cooled to room temperature to obtain a mixture B;

4) Mix and stir dodecylpropanesulfonic acid, biological glue, early strength agent and water evenly to obtain dilute solution C;

5) Mix cement, river sand, mixture B and dilute solution C evenly, then add mixture A while stirring, and then stir evenly, it can be used for cement concrete in cold and high altitude areas.

In step 2), the cellulose fiber, polyethylene glycol and initiator were sequentially added to a heating reaction kettle at a temperature of 80° C., and then stirred at a speed of 150 r/min under normal pressure for 15 minutes to obtain a mixture A .

Stir evenly in step 3) and then cool to room temperature to obtain the mixture B. The specific operation is: stir at a speed of 200 r/min for 10 minutes under normal pressure, and then cool to room temperature to obtain the mixture B.

Claims (10)

1. A kind of cement concrete that is used for alpine, high-altitude area is characterized in that, be 25%～40% cement, 25%～40% river sand, 15%～20% water, 0.4% by mass percent ~0.6% dodecylbenzenesulfonic acid, 1.2%~2% biological glue, 2%~4% early strength agent, 1.8%~2.2% cellulose fiber, 0.8%~1.2% polyethylene glycol Alcohol, 0.4%-0.6% initiator, 2%-4% stearic acid, 2%-4% fatty acid and 0.2%-0.4% potassium permanganate. 2. The cement concrete for alpine and high altitude areas according to claim 1, wherein the biological glue is mixed with 60% to 70% xanthan gum and 30% to 40% Brunei gum by mass percentage made. 3. the cement concrete for alpine and high altitude regions according to claim 1, characterized in that the initiator is mixed with benzoyl peroxide and 40% to 60% sucrose by mass percentage made. 4. The cement concrete for high cold and high altitude regions according to claim 1, wherein the cement is Portland cement of 42.5 strength grade or Portland cement of 52.5 strength grade; The fineness modulus of river sand is 2.3-2.8. 5. The cement concrete for alpine and high altitude regions according to claim 1, characterized in that the early strength agent is mixed with 70% to 80% sodium nitrate and 20% to 30% triethanolamine by mass percentage become. 6. The cement concrete for alpine and high-altitude regions according to claim 1, characterized in that the modulus of elasticity of the cellulose fibers is 8 to 10GPa, the tensile strength of the cellulose fibers is 500 to 1000MPa, and the cellulose fibers The length of the fiber is 2-3mm, and the aspect ratio of the cellulose fiber is 130-150; The relative molecular weight of polyethylene glycol is 1000-1200, and polyethylene glycol is light white waxy solid. 7. The cement concrete for alpine and high altitude regions according to claim 1, wherein the fatty acid is a medium-chain fatty acid lauric acid containing 12 carbon atoms, and the fatty acid is a saturated fatty acid, and the density of the fatty acid is 0.8830g /mL, the melting point of fatty acid is 44°C. 8. a preparation method for the cement concrete of the high cold, high altitude area as claimed in claim 1, is characterized in that, comprises the following steps: 1) Weighing cement, river sand, water, dodecylbenzenesulfonic acid, biological glue, early strength agent, cellulose fiber, polyethylene glycol, initiator, stearic acid, fatty acid and potassium permanganate; 2) adding cellulose fiber, polyethylene glycol and initiator in sequence to a heated reaction kettle at a temperature of 70-80°C, and then stirring evenly to obtain a mixture A; 3) Add stearic acid, fatty acid and potassium permanganate sequentially into a stirring device at a temperature of 110-120°C, stir evenly and cool to room temperature to obtain mixture B; 4) Mix and stir dodecylpropanesulfonic acid, biological glue, early strength agent and water evenly to obtain dilute solution C; 5) Mix cement, river sand, mixture B and dilute solution C evenly, then add mixture A while stirring, and then stir evenly, it can be used for cement concrete in cold and high altitude areas. 9. the preparation method for the cement concrete of alpine, high altitude area according to claim 8, it is characterized in that, in step 2), described cellulose fiber, polyethylene glycol and initiator are added successively to temperature In a heated reaction kettle at 70-80°C, stir at a speed of 150r/min for 10-15min under normal pressure to obtain the mixture A. 10. the preparation method for the cement concrete of alpine, high altitude area according to claim 1, it is characterized in that, in step 3) after stirring evenly, be cooled to room temperature, the concrete operation that obtains mixture B is: under normal pressure Stir at a speed of 200r/min for 10min, then cool to room temperature to obtain mixture B.