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Machine-made sand concrete and preparation process thereof

A technology for machine-made sand and concrete, applied in the field of concrete production, can solve the problems affecting the workability of concrete, limited quantity, etc., and achieve the effects of improving fluidity, slump retention, water retention, and excellent dispersibility.

Inactive Publication Date: 2019-04-19
陕西宏基混凝土构件有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since machine-made sand is broken by artificial machinery, there will be a certain amount of stone powder in it. The main chemical component of stone powder is calcium carbonate. Although some good results will be achieved by participating in the cement hydration reaction, it can participate in the cement hydration reaction. The amount of stone powder is very limited, and the excess stone powder will be free in the periphery, affecting the workability of concrete

Method used

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  • Machine-made sand concrete and preparation process thereof
  • Machine-made sand concrete and preparation process thereof
  • Machine-made sand concrete and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Machine-made sand concrete includes the following components: 350kg machine-made sand, 520kg river sand, 404kg cement, 40kg fly ash, 700kg gravel, 170kg water, 1kg polypropylene fiber, 40kg limestone powder, 30kg ceramic polishing powder, 7.8kg water reducer , 0.005kg retarder and 0.005kg defoamer;

[0040] The water reducer includes 7.5kg polycarboxylate water reducer, 0.21kg water-based polymer, 0.03kg gallic acid, and 0.06kg diethylene glycol.

[0041] Among them, the fly ash is selected from the fly ash modified by dolomite. The specific modification treatment steps include mixing dolomite, silica and fly ash in a weight ratio of 1:1:7, adding water and stirring evenly, so that dolomite and silica are coated on the surface of fly ash particles, and then Calcined at 920°C, kept for 1 hour, then quenched.

[0042] The production process of waterborne polymers includes:

[0043] (1) Dissolve 4 parts of hydrogen peroxide and 8 parts of water completely to obtain the ...

Embodiment 2

[0053] Machine-made sand concrete includes the following components: 380kg machine-made sand, 550kg river sand, 420kg cement, 47kg fly ash, 600kg gravel, 180kg water, 1kg polypropylene fiber, 43kg limestone powder, 34kg ceramic polishing powder, 7.6kg water reducer , 0.005kg retarder and 0.005kg defoamer;

[0054] The water reducer includes 7.5kg polycarboxylate water reducer, 0.07kg water-based polymer, 0.01kg gallic acid, and 0.02kg diethylene glycol.

[0055] Among them, the fly ash is selected from the fly ash modified by dolomite. The specific modification treatment steps include mixing dolomite, silica and fly ash in a weight ratio of 1:1:7, adding water and stirring evenly, so that dolomite and silica are coated on the surface of fly ash particles, and then Calcination at 930°C, heat preservation for 1 hour, then quenching.

[0056] The production process of waterborne polymers includes:

[0057] (1) Dissolve 5 parts of hydrogen peroxide and 8 parts of water complete...

Embodiment 3

[0067] Machine-made sand concrete includes the following components: 370kg machine-made sand, 512kg river sand, 380kg cement, 50kg fly ash, 680kg gravel, 175kg water, 2kg polypropylene fiber, 48kg limestone powder, 38kg ceramic polishing powder, 7.8kg water reducer , 0.006kg retarder and 0.0006kg defoamer;

[0068] The water reducer includes 7.7kg polycarboxylate water reducer, 0.07kg water-based polymer, 0.01kg gallic acid, and 0.02kg diethylene glycol.

[0069] Among them, the fly ash is selected from the fly ash modified by dolomite. The specific modification treatment steps include mixing dolomite, silicon dioxide and fly ash in a weight ratio of 1:1:8, adding water and stirring evenly, so that dolomite and silicon dioxide are coated on the surface of fly ash particles, and then Calcined at 940°C, kept for 1 hour, then quenched.

[0070] The production process of waterborne polymers includes:

[0071] (1) Dissolve 6 parts of hydrogen peroxide and 8 parts of water comple...

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Abstract

The invention relates to machine-made sand concrete and a preparation process thereof. The preparation process comprises the following steps: step one, a first mixture is obtained after a water reducing agent and a retarder are first added into 50-80 parts of water and stirred uniformly, and then fly ash, cement, limestone powder and ceramic polishing powder are added and mixed uniformly; step two, a second mixture is obtained after river sand, machine-made sand, crushed stone, polypropylene fiber and residual water are added into the first mixture; step three, after the second mixture is stirred uniformly, a defoaming agent is added and stirred uniformly, and the machine-made sand concrete is made. The addition of polypropylene fiber in the components can improve the strength of the concrete. The limestone powder and the ceramic polishing powder can play a certain role in reducing water and improve the conditions that the content of stone powder in the machine-made sand is high and alarge amount of water is needed to a certain extent. In addition, the composite water reducing agent is selected as the water reducing agent, so that the dosage of the water reducing agent is reduced,the hydration of cement can be delayed, and the concrete has higher slump retention property.

Description

technical field [0001] The invention relates to the technical field of concrete production, in particular to a machine-made sand concrete and a preparation process thereof. Background technique [0002] Concrete is generally composed of coarse aggregate, fine aggregate, cement, additives, water and admixtures. Among them, sand is a fine aggregate, and its mass accounts for about 30%. Sand plains are formed by rocks under natural conditions, and are solidly called natural sands. With the development of the economy, natural sand resources are becoming increasingly exhausted, and the excessive exploitation of natural sand has also caused great pressure on the environment and ecology. At the same time, the rapid increase of my country's infrastructure projects has brought about the emergence of machine-made sand. It has become a trend for machine-made sand to replace natural sand as construction sand. [0003] The shape of machine-made sand particles is rough and sharp, with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/02C04B111/20
CPCC04B28/02C04B2111/2038C04B14/06C04B14/02C04B14/28C04B16/0633C04B18/08C04B18/165C04B24/02C04B24/06C04B24/16C04B14/26C04B22/068C04B24/04C04B24/124C04B24/023C04B2103/0068C04B2103/22C04B2103/50C04B2103/302
Inventor 杨金平
Owner 陕西宏基混凝土构件有限责任公司
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