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A method of preparing components of railroad engineering machine-made sand pump concrete

A technology for pumping concrete, railway engineering, applied in the field of concrete, can solve problems such as not grasping

Active Publication Date: 2016-04-06
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, these problems have occurred in machine-made sand pumping concrete. The essence is that the essence of the problem has not been grasped or the essential problem has not been solved well during the preparation.

Method used

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  • A method of preparing components of railroad engineering machine-made sand pump concrete
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  • A method of preparing components of railroad engineering machine-made sand pump concrete

Examples

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Effect test

Embodiment 1

[0051] Example 1: C25 machine-made sand pumping concrete, σ is 5.0MPa, and the required slump is 180-200mm.

[0052] The use of raw materials in the following implementation is as follows: Sichuan Esheng Cement Co., Ltd. P.O42.5 ordinary Portland cement, density 3.10g / cm 3 ; Sichuan Juxing New Material Co., Ltd. JX-GBNHy2 high-performance polycarboxylate superplasticizer, the recommended dosage is 0.8%; Suining thermal power plant Ⅱ grade fly ash, density 2.45g / cm 3 , 14.6% fineness, 25% internally mixed; burnt clay from Sichuan Donglanxing Technology Development Co., Ltd., with a density of 2.65g / cm 3 , mixed with 5%; Guanghan machine-made sand, fineness modulus 2.67, apparent density 2680kg / m 3 , the loose bulk density is 1450kg / m 3 ; The content of fine grains (particles less than 0.15mm) in the sand is 12.0%, and the density is 2.7g / cm 3 ; 5 ~ 25mm continuous gravel, the apparent density is 2680kg / m 3 , loose bulk density 1530kg / m 3 , the porosity is 43%, and the crus...

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Abstract

A method of preparing components of railroad engineering machine-made sand pump concrete is disclosed. The novel method of preparing the railroad engineering machine-made sand pump concrete is provided from the point of view of an optimal equivalent fine-grain volume. The railroad engineering machine-made sand pump concrete with good comprehensive performances can be prepared by the method no matter how raw material variety, grades and producing factories change, thus avoiding a practical problem that a mixing ratio needs repeated testing and repeated verification when raw materials change in engineering, making up disadvantages of preparing methods at present, and creating a railroad engineering machine-made sand pump concrete preparing technique which is more scientific, more reasonable and stabler.

Description

technical field [0001] The technology of the invention belongs to the field of concrete, and in particular relates to a preparation method for concrete pumped with machine-made sand in railway engineering. Background technique [0002] With the rapid development of the economy, natural sand resources are also becoming increasingly exhausted, and my country's infrastructure projects are increasing day by day, so the production and application of machine-made sand are increasing. When designing the mix ratio of railway machine-made sand pumping concrete, in addition to meeting the requirements of the strength grade and elastic modulus of the concrete design, the pumpability of the concrete should also be ensured, that is, the concrete should have certain fluidity and workability. , Water retention, to ensure that the concrete does not segregate and bleed during the continuous pouring process, and prevent the concrete from being stuck and blocked during the pumping process, whi...

Claims

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Application Information

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IPC IPC(8): C04B28/04G06F17/50
CPCC04B28/04C04B2111/00146G06F30/13C04B2103/302C04B18/08C04B18/025C04B14/048C04B14/28C04B20/0076
Inventor 李固华崔圣爱李福海曾晓辉宋登富叶跃忠
Owner SOUTHWEST JIAOTONG UNIV
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