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Preparation method of machine-made sand fine aggregate

A technology of machine-made sand and fine aggregate, applied in the direction of grain processing, etc., can solve the problems of unfavorable fine aggregate fineness modulus, affecting the workability of ready-mixed concrete pumping concrete construction, and accurate control.

Active Publication Date: 2012-07-18
CHONGQING NO 3 CONSTR
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Problems solved by technology

At present, with the continuous increase of ready-mixed concrete production, the demand for machine-made sand has increased sharply, but its production technology is relatively backward, and the sieve residue less than 5.0mm in the crushed stone production process will also be used as machine-made sand, which is not conducive to all industries. The precise control of the fineness modulus of the fine aggregate affects the pumping of ready-mixed concrete and the workability of concrete, and there are hidden dangers in the quality of concrete

Method used

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Embodiment Construction

[0017] Such as figure 1 As shown, the present invention produces machine-made sand fine aggregate with a certain fineness modulus through the sand making process. For realizing flow process technology of the present invention, it has present embodiment as follows:

[0018] (1) The loader puts the raw materials that have been preliminarily cleaned into the feeding bin;

[0019] (2) The feeding bin enters the impact crusher through the feeder, and the gap between the blow bar and the impact plate is initially set to 70mm, and the gap is continuously adjusted according to the discharge situation during the working period;

[0020] (3) After the first crushing, the belt conveyor is transported to the sand screening machine with two layers of screens, and the broken pebbles larger than 45mm are privately returned to the impact crusher through the belt conveyor; the pebbles that meet the requirements enter the second layer of screen The natural sand and machine-made sand less than...

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Abstract

The invention discloses a preparation method of fine aggregate in concrete, specially relating to a preparation method of machine-made sand fine aggregate. The method adopts sand preparing technology; when preparing machine-made sand fine aggregate, the machine-made sand is combined with special fine sand with smallest grain diameter to produce the machine-made sand fine aggregate with certain fineness modulus. The method overcomes the deficiency that in traditional technology, the fineness modulus of the machine-made sand fine aggregate can not be accurately regulated and controlled, and themethod of the invention can directly produce the machine-made sand fine aggregate satisfying premixed concrete pumping as well as construction and easy performance requirements.

Description

technical field [0001] The invention belongs to a preparation method of fine aggregate in concrete, in particular to a preparation method of machine-made sand fine aggregate. Background technique [0002] With the development of high-rise buildings and long-span buildings, as well as the progress of construction technology, the requirements for concrete, a bulk building material, are also high-performance, that is, concrete is required to have high strength, high workability and excellent durability. In the "Ordinary Concrete Mix Proportion Design Regulations" JGJ55-2000 stipulates: 1. Portland cement or ordinary Portland cement with stable quality and strength grade not lower than 42.5 should be selected; 2. For cement with strength grade C60 For concrete, the maximum particle size of the coarse aggregate should not be greater than 31.5mm; for concrete with a strength grade higher than C60, the maximum particle size of the coarse aggregate should not be greater than 25mm; t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B14/02B02C23/08
Inventor 杨帆张纯洁熊渝兴蒋红庆杨光余刘敏郑无容雷文胜熊昭王晓辉
Owner CHONGQING NO 3 CONSTR
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