Desert sand concrete with high substitution rate as well as preparation method and application of desert sand concrete

A desert sand, replacement rate technology, applied in the field of building materials, can solve the problems of performance improvement, etc., to achieve the effect of increasing the replacement rate and fly ash content, improving the anti-chloride ion penetration performance, and improving the anti-chloride ion penetration performance

Pending Publication Date: 2022-05-27
RES INST OF HIGHWAY MINIST OF TRANSPORT
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the replacement rate of desert sand is less than 40%; the amount of fly ash is less than 15%, and the performance needs to be improved

Method used

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  • Desert sand concrete with high substitution rate as well as preparation method and application of desert sand concrete
  • Desert sand concrete with high substitution rate as well as preparation method and application of desert sand concrete
  • Desert sand concrete with high substitution rate as well as preparation method and application of desert sand concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The present embodiment provides a desert sand concrete with a high substitution rate, and the raw materials are as follows: the cement adopts P.O 42.5R cement produced by Conch Cement Co., Ltd.; the fly ash adopts II grade fly ash. The fine aggregates are respectively used: ordinary sand with a fineness modulus of 3.12 and ultra-fine desert sand with a fineness modulus of 0.27. The physical properties of the two are shown in Table 1. The coarse aggregate uses a particle size range of 4 -20mm artificial crushed stone, the particle size range of the specific coarse aggregate is shown in Table 2;

[0035] Table 1 Physical properties of ordinary sand and desert sand

[0036]

[0037] Table 2 Particle size range of coarse aggregate

[0038] Coarse aggregate Particle size range dashi 19~9.5mm small stone 9.5~4.75mm

[0039] The design concrete strength grade of the desert sand concrete with high substitution rate in this embodiment is C40, the ...

Embodiment 2-6

[0045] This embodiment provides a desert sand concrete with a high replacement rate, which is different from Example 1 only in that the replacement rate of desert sand and the content of fly ash are: 60% and 10%, 80% and 10%, and 60%, respectively. and 20%, 80% and 20%, 80% and 30%, as shown in Table 3; marked as FA1DS6, FA1DS8, FA2DS6, FA2DS8, FA3DS8, respectively.

experiment example 1

[0058] In this experimental example, the electro-flux method and the RCM method were used to evaluate the resistance to chloride ion penetration of the example and the comparative example respectively. The concrete specimen for the resistance to chloride ion penetration performance test was a cylinder with a diameter of 100 mm and a height of 50 mm, with a total of 9 in each group. According to the electric flux method and RCM (rapid chloride ion migration coefficient) method in the standard "Standard for Long-term Performance and Durability Performance of Ordinary Concrete" GB / T50082-2009, measure the 0% and 3% of each concrete specimen respectively. , electric flux and chloride ion diffusion coefficient in 6% NaCl solution. The test results are shown in Table 4.

[0059] The electric flux and chloride ion migration coefficient of concrete provided by the embodiment and comparative example of table 4

[0060]

[0061]

[0062] The desert sand replacement rate and the a...

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Abstract

The invention relates to the technical field of building materials, in particular to high-substitution-rate desert sand concrete as well as a preparation method and application thereof. The high-substitution-rate desert sand concrete is prepared from raw materials including cement, fly ash, fine aggregate and coarse aggregate, the fine aggregate is common sand and desert sand, and the desert sand accounts for 60-80% of the total mass of the fine aggregate; the fly ash accounts for 10-30% of the total mass of the cement and the fly ash, the water-binder ratio is 0.42-0.55, and the sand ratio is 33-37%. According to the desert sand concrete with the high substitution rate, desert sand resources can be fully utilized under the condition that the performance of the concrete is guaranteed, and the chloride ion penetration resistance of the concrete can be remarkably improved.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a desert sand concrete with a high replacement rate and a preparation method and application thereof. Background technique [0002] Sand is an extremely important part of concrete preparation. Desert sand is abundant in storage, and the phenomenon of land desertification continues. Sandstorms that occur from time to time also have a bad impact on the environment. Desert sand is everywhere, but no one cares. At the same time, over-exploitation of river sand damages the structure of the river bed, affects the natural settlement of sediment, changes the surface water environment, and even causes river bank collapse accidents, affecting flood control safety. Disturbance will reduce fish and vegetation, and have a great impact on the aquatic ecological environment. Taking the Mu Us Desert as an example, it has an area of ​​42,200 square kilometers and is rich in sand reser...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B111/20
CPCC04B28/04C04B2111/20C04B14/02C04B14/06C04B14/068C04B18/08Y02W30/91
Inventor 贾磊
Owner RES INST OF HIGHWAY MINIST OF TRANSPORT
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