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Method for producing concrete mixture by using machine-made sand to substitute natural sand

A technology for machine-made sand and natural sand is applied in the field of using machine-made sand to replace natural sand to produce concrete mixtures, which can solve the problems affecting the production and construction of commercial concrete, obstacles to the popularization and application of artificial machine-made sand, large fluctuations in concrete strength, and the like. The program has strong controllability, easy popularization, and good liquidity.

Inactive Publication Date: 2008-05-28
CHONGQING DAYE CONCRETE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the mixing time is insufficient, it is easy to agglomerate (block), and the mixture settles and grabs the bottom, resulting in large fluctuations in concrete strength
Severe segregation and bleeding are prone to occur after pumping, resulting in poor pumpability, pipe plugging, pipe bursting, etc., which affect the production and construction of ready-made concrete, and cause obstacles to the popularization and application of artificial machine-made sand.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0017] The sand and gravel in the mechanism are measured and sent to the mixer through the belt conveyor to mix evenly, and the water with 70% of the total water consumption is sent to the mixer by the booster water pump, and the stirring is continued to moisten the sand and gravel in the mechanism. The cement is put into the mixer through the screw conveyor and stirred, so that the cement is wrapped on the surface of the sand and gravel in the mechanism to form a slurry shell, and 30% of the total water consumption and the air-entraining and retarding high-efficiency water reducer are sent in by the booster water pump. Stir and homogenize in a mixer to obtain a finished concrete mixture.

[0018] The sand in the above mechanism is a calcareous material with a fineness modulus of 2.2-2.6 and a stone powder content of less than 4-6%, which is crushed from the limestone parent rock and meets the requirements of the national standard.

[0019] The above-mentioned crushed stone is...

Embodiment approach 2

[0021] After the machine-made coarse sand and gravel are measured, they are sent to the mixer through the belt conveyor and stirred evenly. 80% of the total water consumption is sent to the mixer by the booster water pump, and the stirring is continued to moisten the machine-made coarse sand and gravel. The measured The mixture of cement and slag powder is put into the mixer through the screw conveyor and stirred, so that the mixture of cement and slag powder is wrapped on the surface of the machine-made coarse sand and gravel to form a slurry shell, and the total water consumption is reduced by 20% of water and polycarboxylic acid. The water agent is sent into the mixer by the booster water pump, stirred and homogenized to obtain the finished concrete mixture.

[0022] The above-mentioned machine-made coarse sand is a material with a fineness modulus of 3.2-3.4 and a stone powder content of less than 8-12%, which is crushed from pebbles and meets the requirements of the nation...

Embodiment approach 3

[0025] The medium, coarse sand and gravel in the mechanism are measured and sent to the mixer through the belt conveyor to mix evenly, and the water with 75% of the total water consumption is sent to the mixer by the booster water pump, and the stirring is continued to moisten the medium, coarse sand and gravel in the mechanism. Put the measured mixture of cement, slag powder, fly ash, silica fume, limestone powder, and expansion agent into the mixer through the screw conveyor, so that the mixture is wrapped in the machine, the surface of coarse sand and gravel to form a slurry For the shell, 30% of the total water consumption and the air-entraining and retarding high-efficiency superplasticizer are sent into the mixer by the booster water pump to stir and homogenize to obtain the finished concrete mixture.

[0026] The sand in the above mechanism is a calcareous material with a fineness modulus of 2.2-2.6 and a stone powder content of less than 4-6%, which is crushed from the ...

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Abstract

The invention relates to a production method of a concrete mixture, in particular to a method of producing concrete mixture by using machine-made sand instead of natural sand. The machine-made sand and gravel after being measured are fed into a stirrer to be stirred uniformly, then 70-80 percent of water of the total water is added into the mixture, which is stirred again so as to lead the mixture to become wet; measured cementing materials are put into the stirrer, and the residual water of the total water and concrete additive are added into the stirrer to be stirred uniformly. The concrete mixture prepared by the invention overcomes the defects existed in the concrete mixture which is prepared by employing machine-made sand instead of natural sand with the existing traditional technology, thus improving the property of the concrete mixture which is produced by adopting machine-made sand.

Description

technical field [0001] The invention relates to a production method of concrete mixture, in particular to a method for producing concrete mixture by using machine-made sand instead of natural sand. Background technique [0002] Concrete is widely used in construction engineering. In the traditional process of preparing concrete mixture, sand, stone, water, cement and other materials are put into the mixer in a certain proportion and mixed at one time, and the sand (fine aggregate) used is natural sand. It is one of the most important raw materials indispensable for the production of concrete mixture, and based on the application of local resources is the basic economic attribute of concrete raw materials. However, due to the unprecedented increase in the use of concrete due to the rapid development of urban construction, natural sand resources are facing depletion, and for the protection of the ecological environment, it is the general trend to li...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B14/06C04B24/04
Inventor 邸春福杨文烈
Owner CHONGQING DAYE CONCRETE
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