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Grade-C30 single-particle regenerated self-compaction concrete and preparation method thereof

A self-compacting concrete and single-grain technology, which is applied in the field of building materials, can solve the problems of high raw material costs and complicated procedures, and achieve the effects of simplifying processing procedures, solving environmental and social problems, and saving resources

Active Publication Date: 2014-07-23
镇江建工建设集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a C30 grade single-grain grade recycled self-compacting concrete, which solves the technical problems in the prior art that self-compacting concrete requires continuously graded recycled aggregates for production, complicated procedures, and high cost of raw materials.

Method used

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  • Grade-C30 single-particle regenerated self-compaction concrete and preparation method thereof
  • Grade-C30 single-particle regenerated self-compaction concrete and preparation method thereof
  • Grade-C30 single-particle regenerated self-compaction concrete and preparation method thereof

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Embodiment

[0050] (1) Prepare raw materials:

[0051] Cement: P O42.5 ordinary Portland cement, apparent density is 3.10g / cm 3 .

[0052] Fly ash: Class 1 fly ash, apparent density 2.04g / cm 3 .

[0053] Sand: medium sand with a fineness modulus of 2.36 and an apparent density of 2.65g / cm 3 , bulk density is 1.45g / cm 3 , with a moisture content of 0.4%.

[0054] Natural coarse aggregate: crushed stone with a continuous particle size of 5-20mm, and an apparent density of 2.75g / cm 3 , bulk density is 1.35g / cm 3 , The water absorption rate is 0.45%.

[0055] Regenerated coarse aggregate: After sorting, crushing and screening the waste concrete in construction waste, and sieving out particles smaller than 9.50mm and larger than 20mm, the aggregate particle size is processed into recycled coarse aggregate with a particle size of 10mm to 20mm Aggregate, the apparent density is 2.35g / cm 3 , bulk density is 1.23g / cm 3 , The water absorption rate is 4.76%.

[0056] Admixture: polycarbox...

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Abstract

The invention discloses a Grade-C30 single-particle regenerated self-compaction concrete. The invention is characterized in that the Grade-C30 single-particle regenerated self-compaction concrete is prepared from the following raw materials in parts by weight: 1 part of cement, 0.70-1.53 parts of regenerated coarse aggregate, 0.66-1.64 parts of natural coarse aggregate, 1.90 parts of fine aggregate, 0.47 part of water, 0.04-0.08 part of additional water, 0.26 part of fly ash and 0.006-0.007 part of admixture. The water-binder ratio of the self-compaction concrete is 0.37. The flowability, filling property, segregation resistance, gradual loss and strength of the regenerated self-compaction concrete satisfy related requirements. The regenerated self-compaction concrete is convenient for construction, and lowers the production cost of the concrete. The regenerated self-compaction concrete solves the problem of treatment of construction waste, relieves the pressure of resource depletion, and is green and environment-friendly; and the preparation method is simple and suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of building materials, and specifically relates to a method for preparing recycled self-compacting concrete by using waste concrete containing a small amount of broken bricks in building demolition objects as single-grain recycled coarse aggregate to replace part of natural coarse aggregate. Background technique [0002] Self-compacting concrete (Self Compacting Concrete or Self-Consolidating Concrete referred to as SCC) refers to the ability to flow and compact under its own gravity, even if there are dense steel bars, it can completely fill the formwork, while obtaining good homogeneity, and does not require additional vibrating concrete. The preparation of self-compacting concrete generally reduces the yield stress of the concrete enough to be overcome by the shear stress due to its own weight through the selection and matching of admixtures, cementing materials, coarse and fine aggregates, and careful mi...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B18/16C04B14/06
CPCY02W30/91
Inventor 潘志宏吴春杨马剑张硕吴晨邱涛
Owner 镇江建工建设集团有限公司
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