Concrete containing machine-made sand and preparation method thereof

Abstract

The invention discloses concrete containing machine-made sand. The concrete is prepared from the following raw materials in parts by weight: 300 to 500 parts of cement, 45 to 60 parts of fly ash, 55 to 75 parts of mineral powder, 600 to 900 parts of fine aggregate, 35 to 45 parts of silica fume, 600 to 660 parts of machine-made sand, 60 to 75 parts of rubber particles, 40 to 50 parts of admixture and 8 to 15 parts of water reducing agent. According to the concrete containing the machine-made sand and the preparation method of the concrete, by adding the fly ash, the mineral powder, the fine aggregate, the silica fume, the rubber particles and the admixture, the tensile strength, the compressive strength and the flexibility of the concrete are enhanced, meanwhile, the cohesiveness of the concrete can be improved, the layering phenomenon of the concrete is improved, and therefore the concrete is not prone to cracking, and the service life of the concrete is prolonged. The anti-seepage concrete has the advantages of improving the crack generation condition of the anti-seepage concrete, reducing the hydration heat of the concrete, replacing the river sand without three-waste discharge, and adding the rubber particles prepared from waste rubber products, thereby having favorable economic and social benefits.

Description

Technical Field

[0001] The invention relates to the technical field of concrete, in particular to concrete containing machine-made sand and a preparation method thereof. Background Art

[0002] With the development and progress of human society, human beings have the ability to expand their living space. At present, people are advancing into the sky, underground and the ocean. Modern buildings are becoming higher and higher, larger and lighter. Large structures are being built in the deep ocean and huge working platforms are being built on the sea surface. More and more large-span bridges and undersea tunnels are being built across rivers, deep valleys and straits. All of these require higher and higher quality concrete.

[0003] River sand is a natural resource. Its formation process is long and its total amount is limited. Moreover, when scooping natural river sand, it is easy to cause damage to river courses, farmland, water conservancy and other problems, which seriously restricts the use of natural sand resources in concrete. The contradiction between the limited natural sand resources and the large market demand, coupled with the constraints of quality factors and the guidance of price factors, has led to the gradual transfer of construction sand from natural river sand to artificial sand.

[0004] Among them, the pebble-like machine-made sand used in underwater concrete has unsatisfactory fluidity and cohesiveness, which can easily lead to pipe blockage, floating cages and other adverse consequences during construction. In order to meet good construction requirements, it must be matched with natural sand, which will inevitably increase the cost of fine aggregate, significantly reduce profits, increase factors affecting the fluctuation of concrete quality, and make concrete quality control more difficult. Summary of the invention

[0005] 1. Technical issues to be solved

[0006] In view of the shortcomings of the prior art, the present invention provides a concrete containing machine-made sand and a preparation method thereof, which has the advantages of high strength and good durability, low production cost, economy and environmental protection.

[0007] (II) Technical solution

[0008] To achieve the above object, the present invention provides the following technical solution: a concrete containing machine-made sand, comprising the following raw materials in proportion by weight: 300-500 parts of cement, 45-60 parts of fly ash, 55-75 parts of mineral powder, 600-900 parts of fine aggregate, 35-45 parts of silica fume, 600-660 parts of machine-made sand, 60-75 parts of rubber particles, 40-50 parts of admixture and 8-15 parts of water reducing agent;

[0009] The machine-made sand is made of the following components:

[0010] Granite, rhyolite, diabase, diorite, sandstone, limestone, adhesives and silane coupling agents.

[0011] Preferably, the fly ash is primary fly ash.

[0012] Preferably, the fineness modulus of the machine-made sand is 2.2-1.6, and the average particle size is 0.35 mm-0.25 mm.

[0013] Preferably, the water reducer is a polycarboxylic acid high performance water reducer, the admixture includes lime powder and slag powder, and the ratio of the lime powder to the slag powder is 5:2.

[0014] Preferably, the mesh size of the rubber particles is 60 to 75 meshes.

[0015] Another technical problem to be solved by the present invention is to provide a method for preparing concrete containing machine-made sand, comprising the following steps:

[0016] 1) Soak the rubber particles in a 15% to 20% KOH solution for 3 to 5 minutes, wash with clean water, and dry in the sun for later use;

[0017] 2) Use a meter to weigh cement, fly ash, mineral powder, fine aggregate, silica fume, machine-made sand, rubber particles, admixtures and water reducer according to the proportion;

[0018] 3) Mixing cement and water to form cement slurry;

[0019] 4) Add fly ash and water reducing agent to cement slurry and mix well to form mixed slurry.

[0020] 5) Add mineral powder, fine aggregate, silica fume, machine-made sand, rubber particles and admixtures to the mixed slurry to form cement mortar;

[0021] 6) Pour cement mortar into the mold, cure, and demould to obtain concrete containing machine-made sand.

[0022] (III) Beneficial effects

[0023] Compared with the prior art, the present invention provides a concrete containing machine-made sand and a preparation method thereof, which has the following beneficial effects:

[0024] The concrete containing machine-made sand and the preparation method thereof are beneficial to enhancing the tensile strength, compressive strength and flexibility of the concrete by adding fly ash, mineral powder, fine aggregate, silica fume, rubber particles and admixtures, and can also improve the cohesiveness of the concrete and improve the stratification of the concrete, thereby making the concrete less likely to crack, improving the cracking of the impermeable concrete, and reducing the hydration heat of the concrete. Secondly, river sand is replaced without the discharge of three wastes, and rubber particles made of waste rubber products can be added, which has good economic and social benefits. DETAILED DESCRIPTION

[0025] 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.

[0026] Embodiment 1:

[0027] A concrete containing machine-made sand, comprising the following raw materials in proportion by weight: 300 parts of cement, 45 parts of fly ash, 55 parts of mineral powder, 600 parts of fine aggregate, 35 parts of silica fume, 600 parts of machine-made sand, 60 parts of rubber particles, 40 parts of admixtures and 8 parts of water reducer, the fly ash is first-grade fly ash, the fineness modulus of the machine-made sand is: 2.2-1.6, the average particle size is 0.35mm-0.25mm, the water reducer is a polycarboxylic acid high-performance water reducer, the admixture comprises lime powder and slag powder, the ratio of lime powder to slag powder is 5:2, and the mesh number of the rubber particles is 60 meshes;

[0028] Machine-made sand is made from the following components:

[0029] Granite, rhyolite, diabase, diorite, sandstone, limestone, adhesives and silane coupling agents.

[0030] A method for preparing concrete containing machine-made sand comprises the following steps:

[0031] 1) Soak the rubber particles in a 15% KOH solution for 3 minutes, wash them with clean water, and dry them in the sun for later use;

[0032] 2) Use a meter to weigh 300 parts of cement, 45 parts of fly ash, 55 parts of mineral powder, 600 parts of fine aggregate, 35 parts of silica fume, 600 parts of machine-made sand, 60 parts of rubber particles, 40 parts of admixture and 8 parts of water reducer according to the proportion;

[0033] 3) Mixing cement and water to form cement slurry;

[0034] 4) Add 45 parts of fly ash and 8 parts of water reducing agent into the cement slurry, mix well to form a mixed slurry;

[0035] 5) Add 55 parts of mineral powder, 600 parts of fine aggregate, 35 parts of silica fume, 600 parts of machine-made sand, 60 parts of rubber particles and 40 parts of admixture into the mixed slurry to form cement mortar;

[0036] 6) Pour cement mortar into the mold, cure, and demould to obtain concrete containing machine-made sand.

[0037] Embodiment 2:

[0038] A concrete containing machine-made sand, comprising the following raw materials in proportion by weight: 500 parts of cement, 60 parts of fly ash, 75 parts of mineral powder, 900 parts of fine aggregate, 45 parts of silica fume, 660 parts of machine-made sand, 75 parts of rubber particles, 50 parts of admixtures and 15 parts of water reducer, the fly ash is first-grade fly ash, the fineness modulus of the machine-made sand is: 2.2-1.6, the average particle size is 0.35mm-0.25mm, the water reducer is a polycarboxylic acid high-performance water reducer, the admixture comprises lime powder and slag powder, the ratio of lime powder to slag powder is 5:2, and the mesh number of the rubber particles is 60-75 meshes;

[0039] Machine-made sand is made from the following components:

[0040] Granite, rhyolite, diabase, diorite, sandstone, limestone, adhesives and silane coupling agents.

[0041] A method for preparing concrete containing machine-made sand comprises the following steps:

[0042] 1) Soak the rubber particles in a 20% KOH solution for 5 minutes, take them out, wash them with clean water, and dry them in the sun for later use;

[0043] 2) Use a meter to weigh 500 parts of cement, 60 parts of fly ash, 75 parts of mineral powder, 900 parts of fine aggregate, 45 parts of silica fume, 660 parts of machine-made sand, 75 parts of rubber particles, 50 parts of admixture and 15 parts of water reducer according to the proportion;

[0044] 3) Mixing cement and water to form cement slurry;

[0045] 4) Add 60 parts of fly ash and 15 parts of water reducing agent to the cement slurry and mix well to form a mixed slurry.

[0046] 5) Add 75 parts of mineral powder, 900 parts of fine aggregate, 45 parts of silica fume, 660 parts of machine-made sand, 75 parts of rubber particles and 50 parts of admixture into the mixed slurry to form cement mortar;

[0047] 6) Pour cement mortar into the mold, cure, and demould to obtain concrete containing machine-made sand.

[0048] Embodiment three:

[0049] A concrete containing machine-made sand, comprising the following raw materials in proportion by weight: 400 parts of cement, 50 parts of fly ash, 60 parts of mineral powder, 800 parts of fine aggregate, 40 parts of silica fume, 630 parts of machine-made sand, 60 parts of rubber particles, 43 parts of admixtures and 10 parts of water reducer, the fly ash is first-grade fly ash, the fineness modulus of the machine-made sand is: 2.2-1.6, the average particle size is 0.35mm-0.25mm, the water reducer is a polycarboxylic acid high-performance water reducer, the admixture comprises lime powder and slag powder, the ratio of lime powder to slag powder is 5:2, and the mesh number of the rubber particles is 60-75 meshes;

[0050] Machine-made sand is made from the following components:

[0051] Granite, rhyolite, diabase, diorite, sandstone, limestone, adhesives and silane coupling agents.

[0052] A method for preparing concrete containing machine-made sand comprises the following steps:

[0053] 1) Soak the rubber particles in a 20% KOH solution for 3 minutes, wash them with clean water, and dry them in the sun for later use;

[0054] 2) Use a meter to weigh 400 parts of cement, 50 parts of fly ash, 60 parts of mineral powder, 800 parts of fine aggregate, 40 parts of silica fume, 630 parts of machine-made sand, 60 parts of rubber particles, 43 parts of admixtures and 10 parts of water reducer according to the proportion;

[0055] 3) Mixing cement and water to form cement slurry;

[0056] 4) Add 50 parts of fly ash and 10 parts of water reducing agent to the cement slurry and mix well to form a mixed slurry.

[0057] 5) Add 60 parts of mineral powder, 800 parts of fine aggregate, 40 parts of silica fume, 630 parts of machine-made sand, 60 parts of rubber particles and 43 parts of admixture into the mixed slurry to form cement mortar;

[0058] 6) Pour cement mortar into the mold, cure, and demould to obtain concrete containing machine-made sand.

[0059] The beneficial effects of the present invention are as follows: the concrete containing machine-made sand and the preparation method thereof, by adding fly ash, mineral powder, fine aggregate, silica fume, rubber particles and admixtures, are conducive to enhancing the tensile strength, compressive strength and flexibility of the concrete, and can also improve the cohesiveness of the concrete, improve the stratification phenomenon of the concrete, thereby making the concrete less likely to crack, improving the cracking of the impermeable concrete, and reducing the hydration heat of the concrete. Secondly, river sand is replaced without the discharge of three wastes, and rubber particles made of waste rubber products can be added, which has good economic and social benefits.

[0060] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A concrete containing machine-made sand, characterized in that: The raw materials include the following weight proportions: 300-500 parts of cement, 45-60 parts of fly ash, 55-75 parts of mineral powder, 600-900 parts of fine aggregate, 35-45 parts of silica fume, 600-660 parts of machine-made sand, 60-75 parts of rubber particles, 40-50 parts of admixture and 8-15 parts of water reducing agent; The machine-made sand is made of the following components: Granite, rhyolite, diabase, diorite, sandstone, limestone, adhesives and silane coupling agents.

2. The concrete containing machine-made sand according to claim 1, characterized in that: The fly ash is primary fly ash.

3. The concrete containing machine-made sand according to claim 1, characterized in that: The fineness modulus of the machine-made sand is 2.2-1.6, and the average particle size is 0.35mm-0.25mm.

4. The concrete containing machine-made sand according to claim 1, characterized in that: The water reducer is a polycarboxylic acid high-performance water reducer, and the admixture includes lime powder and slag powder, and the ratio of the lime powder to the slag powder is 5:

2.

5. The concrete containing machine-made sand according to claim 1, characterized in that: The mesh number of the rubber particles is 60 to 75 meshes.

6. The concrete containing machine-made sand according to claim 1, characterized in that: The raw materials include the following proportions by weight: 300 parts of cement, 45 parts of fly ash, 55 parts of mineral powder, 600 parts of fine aggregate, 35 parts of silica fume, 600 parts of machine-made sand, 60 parts of rubber particles, 40 parts of admixture and 8 parts of water reducing agent.

7. The concrete containing machine-made sand according to claim 1, characterized in that: The material comprises the following raw materials in the following proportions by weight: 500 parts of cement, 60 parts of fly ash, 75 parts of mineral powder, 900 parts of fine aggregate, 45 parts of silica fume, 660 parts of machine-made sand, 75 parts of rubber particles, 50 parts of admixture and 15 parts of water reducing agent.

8. The concrete containing machine-made sand according to claim 1, characterized in that: The material comprises the following raw materials in the following proportions by weight: 400 parts of cement, 50 parts of fly ash, 60 parts of mineral powder, 800 parts of fine aggregate, 40 parts of silica fume, 630 parts of machine-made sand, 60 parts of rubber particles, 43 parts of admixture and 10 parts of water reducing agent.

9. A method for preparing concrete containing machine-made sand, characterized in that: The following steps are involved: 1) Soak the rubber particles in a 15% to 20% KOH solution for 3 to 5 minutes, wash with clean water, and dry in the sun for later use; 2) Use a meter to weigh cement, fly ash, mineral powder, fine aggregate, silica fume, machine-made sand, rubber particles, admixtures and water reducer according to the proportion; 3) Mixing cement and water to form cement slurry; 4) Add fly ash and water reducing agent to cement slurry and mix well to form mixed slurry. 5) Add mineral powder, fine aggregate, silica fume, machine-made sand, rubber particles and admixtures to the mixed slurry to form cement mortar; 6) Pour cement mortar into the mold, cure, and demould to obtain concrete containing machine-made sand.