Vibration-free self-compacting concrete composition

A self-compacting concrete and composition technology, applied in the field of infrastructure construction materials, can solve problems such as pollution, land occupation, waste of resources and the environment, and achieve the effects of alleviating scarcity, low cost, and ensuring project quality

Inactive Publication Date: 2013-03-06
SHANGHAI ERSHIYE CONSTR CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large amount of waste is produced in the production process of crushed stone and machine-made sand,

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0021] Prepare the concrete composition according to the following formulas:

[0022] Example 1 Example 2 Example 3 Example 4 cement 100 100 100 100 fly ash 10 25 30 30 limestone powder 20 25 30 50 Polycarboxylate superplasticizer 0.8 1.3 1.7 2.0 Machine-made sand 250 253 258 300 gravel 250 261 269 300

[0023] Water was added to the compositions of each example at a weight ratio of water to cement of 0.4:1, stirred for 2 minutes, and solidified after 12 hours. Concrete workability and compressive strength experiments were carried out:

[0024] Slump / mm Slump spread / mm 7d Strength / MPa 28d Strength / MPa Example 1 270 615 44.5 61.5 Example 2 265 605 40.3 54.4 Example 3 270 615 44.5 61.5 Example 4 285 620 36.2 38.2

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PUM

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Abstract

The invention relates to infrastructure construction materials, particularly to a concrete composition. A vibration-free self-compacting concrete composition is formed by mixing of the following components by weight: 100 parts of cement, 10-30 parts of fly ash, 20-50 parts of limestone powder, 0.8-2 parts of a polycarboxylic acid water reducer, 250-350 parts of machine-made sand obtained by crushing gravel, and 250-350 parts of gravel. The limestone powder is made by processing the waste material generated in the gravel and machine-made sand production process. The invention realizes complete utilization of limestone resources, not only reduces the project cost, but also realizes the energy saving and environmental protection, thus being in line with the development requirements of green concrete.

Description

technical field [0001] The invention relates to foundation construction materials, in particular to a concrete composition. Background technique [0002] Self-compacting concrete means that the mixture has high fluidity. In the traditional slump test, the slump reaches more than 250mm, the slump expansion reaches more than 600mm, and it does not segregate or bleed during the pouring process. Concrete that can fill formwork and wrap steel bars without vibration is a high-end part of high-fluidity concrete. It is especially suitable for engineering reinforcement and the construction of complex special-shaped structures where dense steel bars are not conducive to vibration and compaction. It has become a research hotspot of new concrete. [0003] Self-compacting concrete has high requirements on raw materials. Generally, high-quality river sand is used, and the mineral admixture is double-mixed with high-quality fly ash and slag technology. With the expansion of the domestic c...

Claims

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Application Information

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IPC IPC(8): C04B28/00
Inventor 武猛
Owner SHANGHAI ERSHIYE CONSTR CO LTD
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