Environment-friendly low-drying-shrinkage crack-resistant casting waste sand concrete

An environmentally friendly casting waste sand technology, which is applied in the field of building materials, can solve the problems of reducing the service life of concrete structures and aggravating the deterioration of concrete, and achieve the effects of reducing dry shrinkage and cracking sensitivity, expanding the scope of use, and reducing surface tension.

Active Publication Date: 2016-07-06
江苏鹿晶新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Cracks also become a direct channel for harmful substances to penetrate into the interior of the concrete, aggravating the deterioration of the concrete and greatly reducing the service life of the concrete structure

Method used

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  • Environment-friendly low-drying-shrinkage crack-resistant casting waste sand concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Calculated by weight, it includes 340 parts of cement, 60 parts of rice husk ash, 728 parts of fine aggregate, 1092 parts of coarse aggregate, 7.8 parts of shrinkage reducing agent, 4 parts of water reducing agent and 180 parts of water.

[0027] Performance testing: The compressive strength of concrete at 28 days is 47.2MPa, and its crack resistance grade and drying shrinkage value at different ages are shown in Table 1.

Embodiment 2

[0029] Calculated by weight, it includes 350 parts of cement, 70 parts of rice husk ash, 725 parts of fine aggregate, 1080 parts of coarse aggregate, 8 parts of shrinkage reducing agent, 4.6 parts of water reducing agent and 168 parts of water.

[0030] Performance testing: The compressive strength of concrete at 28 days is 52.9MPa, and its crack resistance grade and drying shrinkage value at different ages are shown in Table 1.

Embodiment 3

[0032] Calculated by weight, it includes 360 parts of cement, 80 parts of rice husk ash, 722 parts of fine aggregate, 1084 parts of coarse aggregate, 8.5 parts of shrinkage reducing agent, 5.2 parts of water reducing agent and 154 parts of water.

[0033] Performance testing: The compressive strength of concrete at 28 days is 57.7MPa, and its crack resistance grade and drying shrinkage value at different ages are shown in Table 1.

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Abstract

The invention discloses an environment-friendly low-drying-shrinkage crack-resistant casting waste sand concrete which is formed by mixing the following components in parts by weight: 330-370 parts of cement, 40-80 parts of rice hull ash, 700-780 parts of fine aggregate (formed by screening and mixing casting waste sand and river sand), 1080-1200 parts of coarse aggregate (macadam), 6-9 parts of shrinkage reducing agent, 3.5-5.5 parts of water reducing agent and 125-180 parts of water. The strength level of the environment-friendly low-drying-shrinkage crack-resistant casting waste sand concrete is C45-C55, the 7d drying shrinkage value is 75-100*10<-6>, the 28d drying shrinkage value is 200-250*10<-6>, the 90d drying shrinkage value is 260-300*10<-6>, and the drying shrinkage value trends to be stable; and the early crack resistance is Grade L-V. The environment-friendly low-drying-shrinkage crack-resistant casting waste sand concrete implements high-added-value recycling of the casting waste sand in concrete, and thus, has favorable environment-friendly effect. The fine aggregate, which is formed by screening and mixing the casting waste sand and river sand, effectively improves the grain size distribution of the aggregate. The rice hull ash, shrinkage reducing agent and other components are doped, thereby lowering the drying shrinkage value of the concrete and obviously enhancing the crack resistance from the angle of solid-liquid-phase optimum design.

Description

Technical field: [0001] The invention belongs to the field of building materials, and in particular relates to an environment-friendly low dry shrinkage and anti-crack casting waste sand concrete. Background technique: [0002] my country is a big country in the foundry industry. The annual output of castings is more than 10 million tons. Every ton of castings produced will produce about 1 ton of foundry waste sand, of which foundry waste silica sand is the main one. At present, except for a small amount of foundry waste sand that has been recycled and reused, most of it has not been effectively treated and utilized. Stacking or landfilling the foundry waste sand will cause direct man-made damage to the existing ecological resource environment, and improper treatment of the foundry waste sand will lead to serious pollution of the surrounding water quality and soil. Therefore, seeking an environment-friendly method and technology for high value-added utilization of foundry w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/02C04B14/02C04B14/06C04B18/16C04B18/24C04B103/30C04B103/56
CPCC04B28/02C04B2103/302C04B2103/58C04B18/24C04B18/165C04B14/06C04B14/02Y02W30/91
Inventor 杜时贵何智海何玲玲胡云进黄曼
Owner 江苏鹿晶新材料科技有限公司
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