C25 green high-performance concrete prepared from all recycled coarse aggregate

A technology of high-performance concrete and recycled coarse aggregate, which is applied in climate sustainability, sustainable waste treatment, solid waste management, etc. Achieve the effect of green environmental protection, convenient production and easy construction in the preparation process

Inactive Publication Date: 2015-08-26
GUANGSHA CONSTR GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disposal of these construction wastes is a problem that plagues the world. The traditional open-air stacking or landfilling causes damage to th

Method used

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  • C25 green high-performance concrete prepared from all recycled coarse aggregate
  • C25 green high-performance concrete prepared from all recycled coarse aggregate
  • C25 green high-performance concrete prepared from all recycled coarse aggregate

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0013] Example 1

[0014] In the preferred embodiment of the present invention, after crushing the waste concrete, a continuous gradation with a particle size of 5-31.5 mm, a mud content of 0.4%, a needle-like particle content of 8%, a crushing index of 11.3%, and a replacement rate are obtained. For 100% recycled coarse aggregate, the indicators of recycled coarse aggregate shall meet the "Quality Standards and Inspection Methods for Common Concrete Stones", and the recycled coarse aggregate shall meet the requirements of "Specifications for Recycled Coarse Aggregates for Concrete". Prepare concrete according to the ratio shown in Table 1.

[0015] Table 1 Concrete mix ratio

[0016] Cement P.O42.5

[0017] The method is: put 738kg of natural sand, 1018kg of recycled coarse aggregate and 25.5kg of water into a stationary mixer, and mix for 15s; then add 310kg of cement, 80kg of mineral powder, 9kg of water reducing agent, 60kg of fly ash and 59.5kg of water, continue to mix for...

Example Embodiment

[0021] Example 2

[0022] In the second embodiment of the present invention, a recycled coarse aggregate with a replacement rate of 100% is used. The indicators of the recycled coarse aggregate should comply with the "Quality Standards and Inspection Methods for Common Concrete Stones", and the recycled coarse aggregate should Meet the requirements of "Specification for Recycled Coarse Aggregate for Concrete". Prepare concrete according to the ratio shown in Table 3.

[0023] Table 3 Concrete mix ratio

[0024] Cement P.O42.5

[0025] The method is: put 771kg of natural sand, 970kg of recycled coarse aggregate and 57.3kg of water into a stationary mixer, and mix for 15s; then add 237kg of cement, 45kg of mineral powder, and 6.6kg of water reducing agent , 69kg of fly ash and 133.7kg of water, continue to mix for 85-105s, and get C25 green high-performance concrete after exiting the machine.

[0026] The C25 green high-performance concrete prepared according to the above method is...

Example Embodiment

[0029] Example 3

[0030] In the third embodiment of the present invention, a recycled coarse aggregate with a replacement rate of 100% is used. The indicators of the recycled coarse aggregate should meet the "Quality Standards and Inspection Methods for Common Concrete Stones", and the recycled coarse aggregate should Meet the requirements of "Specification for Recycled Coarse Aggregate for Concrete". The concrete was prepared according to the ratio shown in Table 5.

[0031] Table 5 Concrete mix ratio

[0032] Cement P.O42.5

[0033] The method is: put 776kg of natural sand, 1005kg of recycled coarse aggregate and 57.3kg of water into a stationary mixer, and mix for 15s; then add 230kg of cement, 51kg of mineral powder, and 6.27kg of water reducing agent , 61kg of fly ash and 133.7kg of water, continue to mix for 85-105s, and get C25 green high-performance concrete after exiting the machine.

[0034] The C25 green high-performance concrete prepared by the above method is subjec...

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Abstract

The invention relates to C25 green high-performance recycled concrete. The concrete is mainly prepared by crushing, cleaning and grading waste concrete and taking recycled aggregate obtained through mixing in a certain ratio as all coarse aggregate to replace pebbles. 100% of the recycled coarse aggregate is added, the waste concrete is used secondarily, and meanwhile, the strength of the concrete is guaranteed. The concrete is doped with mineral powder and fly ash, the usage amount of cement is reduced, the workability of the green high-performance concrete is higher than that of ordinary concrete, the water demand is low, the compactness is good, and various technical indexes meet production, transportation and pumping requirements of the concrete. The concrete is easy to construct, the preparation process is green, and the cost is reduced.

Description

technical field [0001] The invention belongs to the field of building materials and relates to a C25 high-performance concrete configured with recycled coarse aggregate made of construction waste. Background technique [0002] my country's construction industry has entered a stage of development by leaps and bounds. At the same time as new buildings are produced, most old buildings and structures are demolished, so a large amount of concrete material waste will be generated in the project. The disposal of these construction wastes is a problem that plagues the world. The traditional open-air stacking or landfilling causes damage to the natural environment and human living environment to varying degrees, and does not conform to the world trend of sustainable utilization of resources. The sustainable utilization of resources is to reapply the discarded garbage to production and construction after treatment. The green high-performance concrete configured with fully recycled agg...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B18/16C04B18/08C04B18/14
CPCY02W30/91
Inventor 李智慧谢云飞金振潘国华夏建俊
Owner GUANGSHA CONSTR GROUP
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