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High-strength and vibration-free self-compacting concrete prepared from machine-made sand

A technology of concrete and machine-made sand, which is applied in the field of machine-made sand with high-strength, vibration-free self-compacting concrete, and high-strength concrete. It can solve the problems of high-strength concrete such as easy bleeding, segregation, and sensitivity to admixtures, and achieve superior performance and good fluidity. , the effect of reducing the amount of labor

Inactive Publication Date: 2014-12-24
CHINA RAILWAY HI TECH IND CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the prejudice of the prior art on machine-made sand, aiming at the problems that the high-strength concrete prepared with machine-made sand is easy to bleed, segregate, and is sensitive to admixtures, etc., to provide a kind of concrete prepared with machine-made sand with superior performance, especially A high-strength, vibration-free self-compacting concrete prepared from machine-made sand

Method used

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  • High-strength and vibration-free self-compacting concrete prepared from machine-made sand
  • High-strength and vibration-free self-compacting concrete prepared from machine-made sand
  • High-strength and vibration-free self-compacting concrete prepared from machine-made sand

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Screening and testing of machine-made sand raw materials (analysis of machine-made sand characteristics)

[0076] Since the lithology and physical and mechanical properties of sand-making mother rocks vary widely, and the processes and equipment of each sand factory also have similarities and differences, resulting in differences in the indicators of the produced sand. The following 15 sand samples are random sampling. From the test results and pictures It can be seen that the sand gradation produced by the vertical cone crushing process of dolomite parent rock is basically close to the requirements of the sand in Zone II of JGJ52-2006, with good particle fullness, stone powder content of about 10.0%, and small porosity. The dolomitic moderately weathered parent rock produced by the hammer crushing process has a large diameter, the particles on the 0.63mm sieve exceed the standard curve, the particles are more needle-like, and the stone powder content is about 8.5%. Lim...

Embodiment 2

[0081] Study on the effect of different machine-made sand and its stone powder on the performance of concrete

[0082] Combined with the test results of Zhaofu, Yachong and Ruibang sand, the influence of different rocks to produce machine-made sand and the stone powder produced in the production process on the workability and strength of C60 pumped concrete was compared. Compared with natural sand, the machine-made sand particles Rough, angular, and poor gradation. In addition, the higher the content of stone powder in the machine-made sand, the lower the fluidity of its mortar. In order to improve the reduction of fluidity caused by the content of stone powder, the concrete prepared in the test is made of polycarboxylate with high performance. Water reducer, related parameters are shown in Table 3. The influence of test machine-made sand on the workability and strength of C60 pumped concrete.

[0083] table 3

[0084]

[0085]

[0086]It can be seen from Table 3 that ...

Embodiment 5

[0089] Determine the water-binder ratio and the composition of the cementitious material

[0090] Admixtures are one of the indispensable components of high-performance concrete. Using their physical effects and filling effects can not only improve the workability of fresh concrete, but also improve the durability of hardened concrete. The admixture can greatly reduce the micro-cracks inside the concrete due to temperature and shrinkage stress, and improve the compactness and impermeability of the concrete. In this project, Class II F fly ash, S95 class granulated blast furnace slag and silica Ash as an admixture.

[0091] According to the principle of mix ratio design, the water consumption is initially selected as 150kg, the water-binder ratio is 0.23, 0.24, and 0.25 respectively, the tentative sand ratio is 50%, and the concrete bulk density is assumed to be 2520kg / m3. and workability, the test data, workability and strength are shown in Table 4.

[0092] Table 4

[009...

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Abstract

The invention discloses high-strength and vibration-free self-compacting concrete prepared from machine-made sand. The high-strength and vibration-free self-compacting concrete mainly comprises water, a cementing material, machine-made sand and gravels and is characterized in that the main technical parameters of the concrete are as follows: in the concrete, the water-binder ratio is 0.21-0.32, the water-powder ratio is 0.65-0.83, the sand ratio is 44-60%, and the unit paste volume dose is 0.45-0.53. The high-strength and vibration-free self-compacting concrete prepared from the machine-made sand, which is disclosed by the invention, has high flowability, non-segregation, uniformity and stability, flows relying on the self weight of the concrete in the process of pouring, and achieves a compacted effect without vibrating, so that the problem of cracking in section conversion in the process of construction is solved, and thus a series of purposes of reducing the amount of labor, accelerating the construction speed, reducing the construction noise, saving the construction cost, and the like are achieved.

Description

technical field [0001] The invention relates to a concrete prepared with machine-made sand, in particular to a high-strength concrete prepared with machine-made sand, especially high-strength, vibration-free self-compacting concrete made with machine-made sand. Background technique [0002] Concrete is the largest consumable material in the construction market, and high-strength concrete is a basic building material widely used in super high-rise buildings. With the acceleration of urban construction in our country, the consumption of concrete and sand is extremely alarming. At present, natural sand is used to prepare high-strength concrete in most areas of our country, but the resource of natural sand is not renewable in a short time. For this reason, the State Council and local governments have successively adopted a series of control measures, and issued regulations prohibiting or restricting the mining of natural sand. The quantity is controlled at 5000t per year. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B14/06
Inventor 蒲建明钟之义邓美球薛晓芳
Owner CHINA RAILWAY HI TECH IND CORP LTD
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