CN104230239B - Ground ready-mixed mortar and production method thereof - Google Patents

Abstract

The invention relates to ground ready-mixed mortar and a production method thereof, which are characterized in that: the composite material comprises the following raw materials in parts by weight: wherein, the artificial sand is 60 to 70 parts, the cement is 12 to 13 parts, the second-level fly ash is 10 to 12 parts, the polypropylene fiber is 2 to 3 parts, the nylon short fiber is 2 to 3 parts, and the additive is 0.1 to 0.5 part. The invention can obviously improve the performances of the mortar such as compressive strength, impermeability, crack resistance, shrinkage reduction, water retention rate and the like, and has long-term durability; the chemical corrosion resistance is strong, and the method can be used in various special projects; the water reducing agent has excellent construction performance such as excellent working performance, easy pumping and easy compaction on the basis of high water reducing rate and high strength.

Description

Ground ready-mixed mortar and production method thereof

technical field

The invention belongs to the processing field of ready-mixed mortar, in particular to a kind of ready-mixed mortar which can be widely used on the ground of buildings and a production method thereof.

Background technique

Mortar is one of the most widely used building materials in construction engineering, and it is widely used in masonry and plastering of buildings. In my country's current construction projects, more than 60% of buildings still use wall materials such as bricks and blocks, and the construction mortar used in masonry and plastering construction is still mainly cement mortar or mixed mortar.

With the technological progress of the construction industry and the improvement of civilized construction requirements, the on-site mixed mortar has increasingly shown its inherent defects, such as unstable mortar quality, large waste of materials, single type of mortar, low degree of civilized construction, and environmental pollution. Therefore, it is imperative to adopt industrialized ready-mixed mortar. It is an item to ensure the quality of construction projects, improve the modernization level of construction, realize the comprehensive utilization of resources, reduce urban pollution, improve the atmospheric environment, develop bulk cement, and achieve sustainable development. concrete measures.

In addition, at present, my country needs about 600 million tons of sand for construction every year, and most of the areas use natural river sand. Natural river sand resource is a kind of local resource, which is non-renewable in a short time and not suitable for long-distance transportation. With the implementation of environmental protection policies, and because the excessive exploitation of natural river sand will cause damage to the ecological environment, many areas in my country have begun to restrict or ban the mining of natural river sand. The available natural river sand resources have decreased, and the quality of sand has declined and the price Higher and higher. And along with the quickening of urban construction pace, the construction rubbish after the demolition of old house is more and more, handles these construction rubbish to expend a large amount of manpower and material resources, and pollutes the environment.

Mortar cracks and water seepage are very common phenomena in construction engineering. The occurrence and expansion of cracks will cause leakage of the building wall and peeling off of the plaster layer, which will lead to carbonation erosion of the inner concrete or masonry, and make the later buildings The overall strength of the building is reduced, endangering the service life of the building, and in severe cases, it will cause the loss of the building's use function. Cracks and leaks in housing construction not only bring inconvenience to people's lives, but also cause great economic losses to the country. According to statistics, my country spends more than 2,000,000,000 yuan on maintenance of leaking water every year. The annual usage of mortar will reach 750 million m3. If the building mortar has anti-crack and anti-seepage performance, it will reduce the huge maintenance and repair costs caused by mortar cracking and leakage, and save a lot of construction funds. Therefore, mortar has higher requirements for anti-crack and anti-seepage functions.

The ground mortar is to apply a certain thickness of mortar on the indoor and outdoor ground of the building. After hardening, it has a certain compressive strength and bonding strength, which can protect and modify the ground. The ground mortar is directly covered on the ground structure, and is directly bonded with the ground structure, and the thickness is generally 5-30mm.

Since the ground mortar has high requirements for water retention, layering and fluidity during application, and also has high requirements for compressive strength and durability in the later use process, so in order to make the mortar have a better work and The use performance, the type and amount of admixtures such as water-retaining thickening materials added to the ground mortar need to be strictly controlled.

At present, most of the ready-mixed mortars on the market have poor fluidity, easy cracking, low strength, large shrinkage, and high cost. These problems limit the promotion and application of ready-mixed floor mortars. Therefore, it is imperative to develop a ready-mixed mortar with good quality and low cost.

Contents of the invention

The purpose of the present invention is to provide a ground prefabricated concrete structure that significantly improves the properties of compressive strength, impermeability, crack resistance, shrinkage reduction and water retention, and has excellent construction performance such as excellent work performance, easy pumping, and easy compaction. Mixing mortar and its production method.

The present invention is achieved like this:

A ground ready-mixed mortar, characterized in that it includes the following raw materials in parts by weight: 60-70 parts of artificial sand, 12-13 parts of cement, 10-12 parts of grade II fly ash, 2-2 parts of polypropylene fiber 3 parts, 2-3 parts of nylon staple fiber, 0.1-0.5 parts of additives.

The artificial sand is made from waste construction waste, metallurgical slag, ore, refractory materials, bauxite clinker, carborundum and glass raw materials through crushing, sand making, drying and screening through a 2.5mm sieve.

The additives mentioned above include raw materials in the following weight ratio, the weight ratio of high-performance polycarboxylate superplasticizer: ferric chloride: sodium gluconate: defoamer: air-entraining agent is 50-55:15-20:5 —10:2:0.5, the high-performance polycarboxylate water reducer has a polyester structure; or a polyether structure.

The air-entraining agent mentioned above is papermaking black liquor and molasses reaction liquid, and its preparation method is: solid content is 40-60% papermaking black liquor weight 1 part and sugarcane molasses weight 1 part adds 70-90% of weight 1 part The concentrated sulfuric acid is reacted for 0.5-1 hour to obtain.

The percentage by weight of the stone powder of the artificial sand mentioned above is 8-15%.

The production method of the ground ready-mixed mortar of the present invention comprises the following steps: after weighing the artificial sand, cement, class II fly ash, functional additives and additives according to parts by weight, first mix the class II fly ash, functional Auxiliaries and additives are put into the mixer for stirring and mixing, then cement is added into the mixer for stirring and mixing, and finally artificial sand is added into the mixer for mixing and then put into the finished product packaging tank for inspection and packaging to obtain the product.

The present invention adopts two types of high-performance polycarboxylate superplasticizers, one with methacrylic acid as the main chain, carboxylic acid groups and MPEG (Methoxypolyethyleneglycol) as the side chain, polyester structure; the other as the main chain It is polyacrylic acid, the side chain is Vinylalcoholpolyethyleneglycol, polyether structure; the solid content of high-performance polycarboxylate water reducer is 40%.

The outstanding substantive features and remarkable progress of the present invention are:

1. The industrialized production of the ground ready-mixed mortar of the present invention ensures the quality of the mortar, simplifies the preparation process at the construction site, greatly improves the working environment at the construction site, improves the quality of the building, and saves a lot of manpower . At the same time, use fly ash to save energy and reduce environmental pollution; take as much as you can on the construction site to avoid waste of on-site materials; in addition, it can reduce the pollution of construction site noise and dust, and promote the construction of civilized construction sites.

2. The polypropylene fiber of the ground ready-mixed mortar of the present invention is a high-strength bundled monofilament fiber made of polypropylene as a raw material, and a kind of nylon short fiber can be effectively added to the mortar as a functional auxiliary agent. Control the micro-cracks caused by factors such as solid-plastic shrinkage, dry shrinkage, and temperature changes of the mortar, prevent and inhibit the formation and development of cracks, and greatly improve the crack resistance and impermeability, compressive strength and earthquake resistance of concrete.

3. The additives of the ground ready-mixed mortar of the present invention can significantly improve the impermeability, crack resistance, shrinkage reduction, and water retention rate of the mortar, and the impermeability level reaches 12, which can make the mortar particles bond more closely and form a package. It can reduce shrinkage by more than 30% while achieving impermeability, especially in harsh environments, which can reduce shrinkage, which is extremely important for effective crack control.

4. The early strength of the ground ready-mixed mortar of the present invention develops rapidly, and it only needs a short curing period even in winter, which ensures the progress of the project; it has long-term durability; it has strong chemical corrosion resistance and can be used for various special In engineering; on the basis of high water reducing rate and high strength, it also has excellent construction performance such as excellent work performance, easy pumping, and easy compaction.

5. The air-entraining agent and defoamer selected in the present invention have good effects, especially the reaction liquid of papermaking black liquor and molasses, which is low in cost and can be used for waste utilization. Papermaking black liquor contains a large amount of lignin, which can resist the penetration of water molecules after reacting with molasses and sulfuric acid, and can also make the mortar produce a certain sticky substance, which is not easy to crack.

6. The air-entraining agent of the present invention also utilizes the sugar and inorganic salt contained in the papermaking black liquor itself, wherein the sugar can reduce the cracks in the hardened mortar due to the hydration temperature rise, which is beneficial to improve the impermeability of the mortar; while the inorganic salt component Make the mortar strong early, which is beneficial to improve the compressive strength of the mortar.

7. The artificial sand and fly ash in the ground ready-mixed mortar of the present invention utilize ironworks waste slag, desulfurization ash and steel slag, industrial tailings and abandoned construction waste slag, metallurgical slag, ore, refractory material, aluminum where the soil clinker, The production of general industrial solid waste such as corundum and glass raw materials can reduce the use of natural sand. The comprehensive utilization of industrial waste not only promotes sustainable social development, but also plays a major role in promoting circular economy.

detailed description

The present invention is described below in conjunction with embodiment.

Example 1

(1) Raw material and weight:

60 parts of artificial sand, 12 parts of cement, 10 parts of class II fly ash, 2 parts of redispersible latex powder, 2 parts of cold-melt polyvinyl alcohol powder, 0.1 part of additive;

The additive includes raw materials in the following weight ratio: high-performance polycarboxylate water reducer: ferric chloride: sodium gluconate: defoamer: air-entraining agent in a weight ratio of 50:15:5:2:0.5, so The above-mentioned high-performance polycarboxylate water reducer has a polyester structure; or a polyether structure.

(2) Production

After weighing the artificial sand, cement, class II fly ash, functional additives and additives by weight, first put the class II fly ash, functional additives and additives into the mixer for stirring and mixing, and then put Cement is added to the mixer and mixed, and finally the artificial sand is added to the mixer and mixed into the finished product packaging tank, and the package is inspected to obtain the product. When the ready-mixed mortar of the present invention is used, it only needs to add 12-16% of the total mortar. water, stir well and use.

Example 2

(1) Raw material and weight:

65 parts of artificial sand, 12 parts of cement, 11 parts of class II fly ash, 2 parts of redispersible latex powder, 3 parts of cold-melt polyvinyl alcohol powder, 0.2 parts of additives;

The additive includes raw materials in the following weight ratio: high-performance polycarboxylate water reducer: ferric chloride: sodium gluconate: defoamer: air-entraining agent in a weight ratio of 52:16:6:2:0.5, so The above-mentioned high-performance polycarboxylate water reducer has a polyester structure; or a polyether structure.

(2) Production

After weighing the artificial sand, cement, class II fly ash, functional additives and additives by weight, first put the class II fly ash, functional additives and additives into the mixer for stirring and mixing, and then put Cement is added to the mixer and mixed, and finally the artificial sand is added to the mixer and mixed into the finished product packaging tank, and the package is inspected to obtain the product. When the ready-mixed mortar of the present invention is used, it only needs to add 12-16% of the total mortar. water, stir well and use.

Example 3

(1) Raw material and weight:

68 parts of artificial sand, 13 parts of cement, 11 parts of class II fly ash, 3 parts of redispersible latex powder, 2 parts of cold-melt polyvinyl alcohol powder, 0.4 parts of additives;

The additive includes raw materials in the following weight ratio: high-performance polycarboxylate water reducer: ferric chloride: sodium gluconate: defoamer: air-entraining agent in a weight ratio of 54:18:8:2:0.5, so The above-mentioned high-performance polycarboxylate water reducer has a polyester structure; or a polyether structure.

(2) Production

After weighing the artificial sand, cement, class II fly ash, functional additives and additives by weight, first put the class II fly ash, functional additives and additives into the mixer for stirring and mixing, and then put Cement is added to the mixer and mixed, and finally the artificial sand is added to the mixer and mixed into the finished product packaging tank, and the package is inspected to obtain the product. When the ready-mixed mortar of the present invention is used, it only needs to add 12-16% of the total mortar. water, stir well and use.

Example 4

(1) Raw material and weight:

70 parts of artificial sand, 13 parts of cement, 12 parts of class II fly ash, 3 parts of redispersible latex powder, 3 parts of cold-melt polyvinyl alcohol powder, 0.5 parts of additives;

The additive includes raw materials in the following weight ratio: high-performance polycarboxylate water reducer: ferric chloride: sodium gluconate: defoamer: air-entraining agent in a weight ratio of 55:20:10:2:0.5, so The above-mentioned high-performance polycarboxylate water reducer has a polyester structure; or a polyether structure.

(2) Production

After weighing the artificial sand, cement, class II fly ash, functional additives and additives by weight, first put the class II fly ash, functional additives and additives into the mixer for stirring and mixing, and then put Cement is added to the mixer and mixed, and finally the artificial sand is added to the mixer and mixed into the finished product packaging tank, and the package is inspected to obtain the product. When the ready-mixed mortar of the present invention is used, it only needs to add 12-16% of the total mortar. water, stir well and use.

Engineering application examples

The second phase project of Longchi New Town in Hengxian County, Nanning City, has a total construction area of 190,000 m ² . The ground pre-mixed plastering mortar of the present invention is used for the foundation floor, floor floor, and basement floor of the building. The project quality is good, and the setting time, consistency, and Water retention rate, compressive strength, shrinkage rate and other properties meet the standards, and users have no complaints during use.

Main technical index of the present invention:

It shows that the technical indicators such as setting time, consistency, water retention rate, compressive strength, shrinkage rate and the like of the ready-mixed mortar of the present invention are in line with national standards and industry standards.

Comprehensive comparison between traditional mortar and ready-mixed mortar:

traditional mortar ready-mixed mortar to stir On-site manual mixing and stirring lead to unstable quality, and it is difficult to control the use time. Often, on-site watering increases the plasticity, resulting in a decrease in the quality of the slurry. The factory is ready-mixed, no on-site mixing is required, just add an appropriate amount of water for a little mixing, and enough use time can use large-scale professional mixing equipment. construction It often requires a lot of base surface watering or interface treatment, mechanical construction is not possible, the labor intensity is high, the construction efficiency is low, the technical dependence on the construction personnel is strong, the deformation is prone to drop and multi-layer construction is required, and watering and maintenance are required. The bottom layer does not need special treatment and can be mechanically constructed with high efficiency. The slurry itself has a strong sticking force, which reduces slurry scattering, has good construction and anti-fall performance, and excellent water retention performance. quality High shrinkage, often cracks, loose structure, easy to leak, weak adhesion with the bottom layer, high hollowing rate. Reduce cracks, have high adhesion to the bottom layer, no hollowing, low shrinkage, high density, strong impermeability, and high durability. loss The adhesion is poor, the construction is easy to scatter, and the water retention capacity is poor, which is easy to cause water loss, air drying, and waste. The adhesion is large, reducing the slurry scattering during construction, the loss is extremely low, the water retention is strong, and it is not easy to cause waste. Storage and transportation of materials To store a variety of raw materials on the construction site and require a large storage space to transport the mortar to the construction site requires additional processes and procedures. Unified packaging or bulk delivery to the construction site, easy storage and loading and unloading, flexible control of dosage, ready-to-use, and ready-to-use, materials are stored near the construction site, easy to manage, and mixed at the construction site without transportation. Civilization Construction A lot of scattered waste materials are left in the process of mixing, storage and construction, and there is a lot of dust, which requires a lot of labor to clean up the dry and hard slurry remaining on the construction site. Reduces the need to clean up waste, just clear out the wrapping paper bag for a clean spot.

Construction comparison of 100 square meters of ground mortar in the second phase of Longchi New Town Project in Hengxian County, Nanning City:

On-site preparation of mortar Ready-Mixed Mortar - Manual Construction Ready-mixed mortar - mechanical construction Mortar dosage 4 tons 3.2 tons 3.2 tons Mortar unit price 205 yuan 300 yuan 300 yuan mortar cost 820 yuan 960 yuan 960 yuan construction speed 25 square meters/person/day 50 square meters/person/day 140 square meters/person/day construction efficiency 100% 200% 560% Machinery cost —— —— 1 yuan/square meter Labor costs 9 yuan/square meter 4.5 yuan/square meter 1.6 yuan/square meter total cost 1720 yuan 1410 yuan 1220 yuan performance no guarantee of quality All indicators meet the requirements All indicators meet the requirements

Claims (2)

1. A ground ready-mixed mortar, characterized in that it comprises the following raw materials in parts by weight: wherein, 60-70 parts of artificial sand, 12-13 parts of cement, 10-12 parts of Ⅱ grade fly ash, polypropylene fiber 2-3 parts, 2-3 parts of nylon staple fiber, 0.1-0.5 parts of additives; The artificial sand is made from waste construction waste, metallurgical slag, ore, refractory materials, bauxite clinker, corundum and glass raw materials through crushing, sand making, drying, and screening through a 2.5mm sieve; The additives include raw materials in the following weight ratios, high-performance polycarboxylate water reducer: ferric chloride: sodium gluconate: defoamer: air-entraining agent in a weight ratio of 50-55:15-20:5- 10:2:0.5, the high-performance polycarboxylate water reducer has a polyester structure or a polyether structure; The air-entraining agent is the reaction liquid of papermaking black liquor and sugarcane molasses, and its preparation method is: 1 part by weight of papermaking black liquor with a solid content of 40-60% and 1 part by weight of sugarcane molasses are added to 70-90% by weight of 1 part The concentrated sulfuric acid reaction 0.5-1 hour obtains; The production method of the ground ready-mixed mortar comprises the following steps: after weighing the artificial sand, cement, class II fly ash, polypropylene fiber, nylon short fiber and additives according to parts by weight, first mix the class II fly ash, The polypropylene fiber, nylon short fiber and additives are put into the mixer for stirring and mixing, then the cement is added into the mixer for stirring and mixing, and finally the artificial sand is put into the mixer for mixing and then put into the finished product packaging tank, and the package is inspected to obtain the product. 2. The ground ready-mixed mortar according to claim 1, characterized in that: the weight percentage of stone powder in the artificial sand is 8-15%.