CN118878283A - A crack-proof and impermeable concrete - Google Patents

Abstract

The invention discloses a crack-proof and impermeable concrete, which specifically relates to the field of concrete, and includes the following raw materials in parts by weight: 200-300 parts of silicate cement, 780-920 parts of mixed stone, 560-840 parts of filling powder aggregate, 1-1.5 parts of waterproof sealant, 0.7-1.4 parts of modified fiber, and the rest is water, wherein the mixed stone includes 40wt%-50wt% of crushed stone and 50wt%-60wt% of broken concrete blocks by weight percentage. On the one hand, the invention can reuse waste materials, reduce the cost of building construction, and soak in water before use, on the other hand, the water absorption capacity of glass and mica is weaker than that of sand, and the thermal expansion coefficient of the glass and mica is small, thereby effectively avoiding the occurrence of cracking of the concrete body caused by shrinkage; adding modified fiber, the flake monomer is easily dispersed into fiber monofilaments under the action of water immersion and the friction of the mixer, thereby playing an anti-cracking effect, and further effectively improving the mechanical properties of concrete, such as freeze-thaw resistance and impermeability.

Description

A crack-proof and impermeable concrete

Technical Field

The present invention relates to the technical field of concrete, and more particularly to a crack-proof and impermeable concrete.

Background Art

Concrete refers to a mixture of binder (organic, inorganic or organic-inorganic composite), granular aggregate, water, and chemical admixtures and mineral admixtures that need to be added in appropriate proportions, or a composite material with a stacking structure formed after hardening (usually cementitious materials, water, fine aggregate, coarse aggregate, admixtures and mineral admixtures are added when necessary, and mixed in appropriate proportions. Concrete has the characteristics of abundant raw materials, low price and simple production process, so its usage is increasing. At the same time, concrete also has the characteristics of high compressive strength, good durability and a wide range of strength grades. These characteristics make it widely used. It is not only used in various civil engineering projects, but also in shipbuilding, machinery industry, marine development, geothermal engineering, etc. Concrete is also an important material.

Anti-crack and anti-seepage concrete plays an important role in construction projects. With the continuous improvement of building structure requirements, ordinary concrete is prone to cracking and water seepage under the influence of factors such as shrinkage, temperature changes and water pressure. The use of anti-crack and anti-seepage concrete can effectively prevent these problems and improve the durability and service life of concrete.

Summary of the invention

In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a crack-resistant and impermeable concrete. The technical problem to be solved by the present invention is: how to improve the crack-resistant and impermeable performance of the existing concrete.

To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a crack-proof and impermeable concrete, comprising the following raw materials in parts by weight: 200-300 parts of silicate cement, 780-920 parts of mixed stone, 560-840 parts of filling powder aggregate, 1-1.5 parts of waterproof sealant, 0.7-1.4 parts of modified fiber, and the remainder is water, the mixed stone comprises 40wt%-50wt% of crushed stone and 50wt%-60wt% of crushed concrete blocks by weight percentage, and the filling powder aggregate comprises 20wt%-40wt% of siliceous glass fragments and 60wt%-80wt% of mica powder by weight percentage.

In a preferred embodiment, the waterproof sealant is configured as AJ-18 YFP inorganic water-based cement sealing waterproof agent or organic silicon waterproof compacting agent FS102; the modified fiber is configured as any one of polyvinyl alcohol fiber and polypropylene engineering fiber.

In a preferred embodiment, the crushed concrete blocks are made of concrete crushed material with a grade not lower than C25, and the crushed stones and crushed concrete blocks are both set to have a particle size of 5-10 mm.

In a preferred embodiment, the siliceous glass scraps are crushed materials of non-tempered glass waste, and the particle sizes of the siliceous glass scraps and mica powder are set to 0.25 mm-0.5 mm.

In a preferred embodiment, the following raw materials are included in weight proportions: 200 parts of silicate cement, 780 parts of mixed stone, 560 parts of filler powder aggregate, 1.5 parts of waterproof sealant, 1.4 parts of modified fiber, and the remainder is water. The mixed stone comprises 40wt% crushed stone and 60wt% broken concrete blocks by weight percentage, and the filler powder aggregate comprises 20wt% siliceous glass fragments and 80wt% mica powder by weight percentage.

In a preferred embodiment, the following raw materials are included in weight proportions: 250 parts of silicate cement, 850 parts of mixed stone, 700 parts of filler powder aggregate, 1.25 parts of waterproof sealant, 1 part of modified fiber, and the remainder is water. The mixed stone includes 45wt% crushed stone and 55wt% broken concrete blocks by weight percentage, and the filler powder aggregate includes 30wt% siliceous glass fragments and 70wt% mica powder by weight percentage.

In a preferred embodiment, the following raw materials are included in weight proportions: 300 parts of silicate cement, 920 parts of mixed stone, 840 parts of filler powder aggregate, 1 part of waterproof sealant, 0.7 parts of modified fiber, and the remainder is water. The mixed stone comprises 50wt% crushed stone and 50wt% crushed concrete blocks by weight percentage, and the filler powder aggregate comprises 40wt% siliceous glass fragments and 60wt% mica powder by weight percentage.

The present invention also includes a method for preparing crack-proof and impermeable concrete, and the specific steps are as follows:

S1. Prepare raw materials: crush silica glass, mica, crushed stone and broken concrete blocks respectively, and screen the particle size, and completely immerse the screened crushed materials in water to absorb water;

S2, mixing: weigh the following raw materials according to mass proportion: 200-300 parts of Portland cement, 780-920 parts of mixed stone, 560-840 parts of filler powder aggregate, 1-1.5 parts of waterproof sealant, 0.7-1.4 parts of modified fiber, 160-180 parts of water, and put them into a mixer for thorough mixing for 30min-40min;

S3: The mixture is passed into a pouring machine for pouring and demoulding.

Technical effects and advantages of the present invention:

1. The present invention replaces traditional bluestone with a mixed stone material composed of crushed stone and crushed concrete blocks, and uses a filler powder aggregate composed of siliceous glass fragments and mica powder to replace the medium sand raw material in traditional concrete. On the one hand, it can reuse waste materials. The use of recycled sand and gravel can reduce the cost of construction because the price of recycled sand and gravel is relatively low and does not require a large amount of new material procurement. The use of large-grade waste concrete blocks as raw materials can also ensure the firmness of the aggregate, and they are all soaked in water before use. On the other hand, the water absorption capacity of glass and mica is weaker than that of sand, and their own thermal expansion coefficient is small, thereby effectively avoiding the occurrence of cracking of the concrete body caused by shrinkage;

2. In the present invention, modified fibers are added, and the flake monomers are easily dispersed into fiber monofilaments under the action of water immersion and the friction of the mixer, thereby playing an anti-cracking effect and further effectively improving the mechanical properties of concrete, such as freeze-thaw resistance and impermeability.

DETAILED DESCRIPTION

The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Embodiment 1:

The invention provides a crack-proof and seepage-proof concrete, which comprises the following raw materials in parts by weight: 200-300 parts of silicate cement, 780-920 parts of mixed stone, 560-840 parts of filling powder aggregate, 1-1.5 parts of waterproof sealant, 0.7-1.4 parts of modified fiber, and the rest is water, wherein the mixed stone comprises 40wt%-50wt% of crushed stone and 50wt%-60wt% of broken concrete blocks by weight percentage, and the filling powder aggregate comprises 20wt%-40wt% of siliceous glass fragments and 60wt%-80wt% of mica powder by weight percentage; the waterproof sealant is AJ-18 YFP inorganic water-based cement sealing waterproof agent or organic silicon waterproof compacting agent FS102; the modified fiber is any one of polyvinyl alcohol fiber and polypropylene engineering fiber; the broken concrete blocks are selected from concrete crushed materials with a grade not less than C25, and the crushed stone and the broken concrete blocks are both set to 5-10 The siliceous glass scraps are set as the crushed material of the non-tempered glass waste, and the particle sizes of the siliceous glass scraps and the mica powder are set to 0.25mm-0.5mm;

Specifically in this embodiment, the following raw materials are included in weight proportions: 200 parts of silicate cement, 780 parts of mixed stone, 560 parts of filling powder aggregate, 1.5 parts of waterproof sealant, 1.4 parts of modified fiber, and the remainder is water. The mixed stone includes 40wt% crushed stone and 60wt% broken concrete blocks by weight percentage, and the filling powder aggregate includes 20wt% siliceous glass fragments and 80wt% mica powder by weight percentage.

The present invention also includes a method for preparing crack-proof and impermeable concrete, and the specific steps are as follows:

S1. Prepare raw materials: crush silica glass, mica, crushed stone and broken concrete blocks respectively, and screen the particle size, and completely immerse the screened crushed materials in water to absorb water;

S2. Mixing: Weigh the following raw materials according to their mass fractions: 200 parts of Portland cement, 780 parts of mixed stone, 560 parts of filler powder aggregate, 1.5 parts of waterproof sealant, 1.4 parts of modified fiber, and 170 parts of water, and put them into a mixer for thorough mixing for 30-40 minutes;

S3: The mixture is passed into a pouring machine for pouring and demoulding.

Embodiment 2:

The invention provides a crack-proof and seepage-proof concrete, which comprises the following raw materials in parts by weight: 200-300 parts of silicate cement, 780-920 parts of mixed stone, 560-840 parts of filling powder aggregate, 1-1.5 parts of waterproof sealant, 0.7-1.4 parts of modified fiber, and the rest is water, wherein the mixed stone comprises 40wt%-50wt% of crushed stone and 50wt%-60wt% of broken concrete blocks by weight percentage, and the filling powder aggregate comprises 20wt%-40wt% of siliceous glass fragments and 60wt%-80wt% of mica powder by weight percentage; the waterproof sealant is AJ-18 YFP inorganic water-based cement sealing waterproof agent or organic silicon waterproof compacting agent FS102; the modified fiber is any one of polyvinyl alcohol fiber and polypropylene engineering fiber; the broken concrete blocks are selected from concrete crushed materials with a grade not less than C25, and the crushed stone and the broken concrete blocks are both set to 5-10 The siliceous glass scraps are set as the crushed material of the non-tempered glass waste, and the particle sizes of the siliceous glass scraps and the mica powder are set to 0.25mm-0.5mm;

Specifically in this embodiment, the following raw materials are included in weight proportions: 250 parts of silicate cement, 850 parts of mixed stone, 700 parts of filling powder aggregate, 1.25 parts of waterproof sealant, 1 part of modified fiber, and the remainder is water. The mixed stone includes 45wt% crushed stone and 55wt% crushed concrete blocks by weight percentage, and the filling powder aggregate includes 30wt% siliceous glass fragments and 70wt% mica powder by weight percentage.

The present invention also includes a method for preparing crack-proof and impermeable concrete, and the specific steps are as follows:

S1. Prepare raw materials: crush silica glass, mica, crushed stone and broken concrete blocks respectively, and screen the particle size, and completely immerse the screened crushed materials in water to absorb water;

S2. Mixing: Weigh the following raw materials according to their mass fractions: 250 parts of Portland cement, 850 parts of mixed stone, 700 parts of filler powder aggregate, 1.25 parts of waterproof sealant, 1 part of modified fiber, and 170 parts of water, and put them into a mixer for thorough mixing for 30-40 minutes;

S3: The mixture is passed into a pouring machine for pouring and demoulding.

Embodiment 3:

The invention provides a crack-proof and seepage-proof concrete, which comprises the following raw materials in parts by weight: 200-300 parts of silicate cement, 780-920 parts of mixed stone, 560-840 parts of filling powder aggregate, 1-1.5 parts of waterproof sealant, 0.7-1.4 parts of modified fiber, and the rest is water, wherein the mixed stone comprises 40wt%-50wt% of crushed stone and 50wt%-60wt% of broken concrete blocks by weight percentage, and the filling powder aggregate comprises 20wt%-40wt% of siliceous glass fragments and 60wt%-80wt% of mica powder by weight percentage; the waterproof sealant is AJ-18 YFP inorganic water-based cement sealing waterproof agent or organic silicon waterproof compacting agent FS102; the modified fiber is any one of polyvinyl alcohol fiber and polypropylene engineering fiber; the broken concrete blocks are selected from concrete crushed materials with a grade not less than C25, and the crushed stone and the broken concrete blocks are both set to 5-10 The siliceous glass scraps are set as the crushed material of the non-tempered glass waste, and the particle sizes of the siliceous glass scraps and the mica powder are set to 0.25mm-0.5mm;

Specifically in this embodiment, the following raw materials are included in weight proportions: 300 parts of silicate cement, 920 parts of mixed stone, 840 parts of filling powder aggregate, 1 part of waterproof sealant, 0.7 parts of modified fiber, and the remainder is water. The mixed stone includes 50wt% crushed stone and 50wt% broken concrete blocks by weight percentage, and the filling powder aggregate includes 40wt% siliceous glass fragments and 60wt% mica powder by weight percentage.

The present invention also includes a method for preparing crack-proof and impermeable concrete, and the specific steps are as follows:

S1. Prepare raw materials: crush silica glass, mica, crushed stone and broken concrete blocks respectively, and screen the particle size, and completely immerse the screened crushed materials in water to absorb water;

S2, mixing: weigh the following raw materials according to their mass fractions: 300 parts of Portland cement, 920 parts of mixed stone, 840 parts of filler powder aggregate, 1 part of waterproof sealant, 0.7 parts of modified fiber, and 170 parts of water, and send them into a mixer for thorough mixing for 30min-40min;

S3: The mixture is passed into a pouring machine for pouring and demoulding.

Embodiment 4:

The concrete prepared in the above-mentioned Examples 1-3 was taken and the conventional siliceous concrete was added as a comparative example to cast test blocks. The test was carried out according to GBJ82-85 "Test Method for Long-term Performance and Durability of Ordinary Concrete". The test blocks were demoulded 1 day after molding and placed in a constant temperature and humidity chamber with a room temperature of (20±2)°C and a relative humidity of (60±5)%. The test data were tested and the following data were obtained:

3d shrinkage value/mm 7d shrinkage value/mm Water seepage rate/% Example 1 0.019 0.055 44 Example 2 0.018 0.053 42 Example 3 0.023 0.057 46 Comparative Example 0.035 0.075 57

It can be seen from the above table that the raw material mix ratio in Example 2 is moderate. Compared with traditional concrete, the concrete prepared therefrom has improved the density of concrete, thereby improving its own impermeability, and reducing the strength of concrete shrinkage at various stages, effectively avoiding the occurrence of cracking caused by rapid volume shrinkage of concrete.

Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. An anticracking impervious concrete, characterized in that: the material comprises the following raw materials in parts by weight: 200-300 parts of Portland cement, 780-920 parts of mixed stone, 560-840 parts of filler powder aggregate, 1-1.5 parts of waterproof sealant, 0.7-1.4 parts of modified fiber and the balance of water, wherein the mixed stone comprises 40-50 wt% of broken stone and 50-60 wt% of broken concrete blocks by weight percent, and the filler powder aggregate comprises 20-40 wt% of siliceous glass fragments and 60-80 wt% of mica powder by weight percent.

2. The anti-cracking and anti-permeation concrete according to claim 1, wherein: the waterproof sealant is set as AJ-18 YFP inorganic water-based cement sealing waterproof agent or organosilicon waterproof compacting agent FS102; the modified fiber is any one of polyvinyl alcohol fiber or polypropylene engineering fiber.

3. The anti-cracking and anti-permeation concrete according to claim 1, wherein: the broken concrete blocks are made of concrete broken materials with the number not lower than C25, and the broken stone and the broken concrete blocks are respectively set to have the particle sizes of 5-10 mm.

4. The anti-cracking and anti-permeation concrete according to claim 1, wherein: the siliceous glass scraps are arranged as crushed materials of non-toughened glass waste, and the particle sizes of the siliceous glass scraps and the mica powder are set to be 0.25-0.5 mm.

5. The anti-cracking and anti-permeation concrete according to claim 1, wherein: the material comprises the following raw materials in parts by weight: 200 parts of Portland cement, 780 parts of mixed stone, 560 parts of filler powder aggregate, 1.5 parts of waterproof sealant, 1.4 parts of modified fiber and the balance of water, wherein the mixed stone comprises 40 weight percent of broken stone and 60 weight percent of broken concrete blocks, and the filler powder aggregate comprises 20 weight percent of siliceous glass fragments and 80 weight percent of mica powder.

6. The anti-cracking and anti-permeation concrete according to claim 1, wherein: the material comprises the following raw materials in parts by weight: 250 parts of silicate cement, 850 parts of mixed stone, 700 parts of filler powder aggregate, 1.25 parts of waterproof sealant, 1 part of modified fiber and the balance of water, wherein the mixed stone comprises 45 weight percent of broken stone and 55 weight percent of broken concrete blocks, and the filler powder aggregate comprises 30 weight percent of siliceous glass fragments and 70 weight percent of mica powder.

7. The anti-cracking and anti-permeation concrete according to claim 1, wherein: the material comprises the following raw materials in parts by weight: 300 parts of Portland cement, 920 parts of mixed stone, 840 parts of filling powder aggregate, 1 part of waterproof sealant, 0.7 part of modified fiber and the balance of water, wherein the mixed stone comprises 50 weight percent of broken stone and 50 weight percent of broken concrete blocks, and the filling powder aggregate comprises 40 weight percent of siliceous glass fragments and 60 weight percent of mica powder.

8. A method for preparing the anti-cracking and anti-permeability concrete according to any one of claims 1 to 7, characterized in that: the method comprises the following specific steps:

S1, preparing raw materials: respectively crushing siliceous glass, mica, broken stone and crushed concrete blocks, screening particle sizes, and completely soaking the screened crushed materials in water to absorb water;

S2, mixing: 200-300 parts of silicate cement, 780-920 parts of mixed stone, 560-840 parts of filling powder aggregate, 1-1.5 parts of waterproof sealant, 0.7-1.4 parts of modified fiber and 160-180 parts of water are weighed according to parts by weight, and are sent into a stirrer to be fully stirred for 30-40 min;

s3: and (5) introducing the mixture into a casting machine for casting and stripping.