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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 the natural environment and human living environment to varying degrees, and does not conform to the world trend of sustainable resource utilization.

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

Embodiment 1

[0014] In a preferred embodiment of the present invention, after the waste concrete is crushed, the obtained particle size is 5-31.5mm in continuous gradation, the mud content is 0.4%, the needle flake particle content is 8%, the crushing index is 11.3%, and the replacement rate is 100% recycled coarse aggregate, the indicators of recycled coarse aggregate should meet the "General Concrete Stone Quality Standards and Inspection Methods", and the recycled coarse aggregate should meet the requirements of "Specification for Recycled Coarse Aggregate for Concrete". Concrete was prepared according to the ratio shown in Table 1.

[0015] Table 1 Concrete mix ratio

[0016] Cement P.O42.5

310kg

Class II fly ash

60kg

S95 grade mineral powder

80kg

SP404 superplasticizer

9kg

water

85kg

Sand in zone II with a fineness modulus of 2.8

738kg

recycled coarse aggregate

1018kg

[0017] The method is: put 73...

Embodiment 2

[0022] In the second embodiment of the present invention, the recycled coarse aggregate with a replacement rate of 100% is used, and the indicators of the recycled coarse aggregate should comply with the "General Concrete Stone Quality Standards and Inspection Methods", and the recycled coarse aggregate should be It meets the requirements of "Specification for Recycled Coarse Aggregate for Concrete". Concrete was prepared according to the ratio shown in Table 3.

[0023] Table 3 concrete mix ratio

[0024] Cement P.O42.5

237kg

Class II fly ash

69kg

S95 grade mineral powder

45kg

SP404 superplasticizer

6.6kg

water

191kg

Sand in zone II with a fineness modulus of 2.8

771kg

recycled coarse aggregate

970kg

[0025] The method is: put 771kg of natural sand, 970kg of regenerated coarse aggregate and 57.3kg of water into a stationary mixer, and stir for 15s; then add 237kg of cement, 45kg of minera...

Embodiment 3

[0030] In the third embodiment of the present invention, the recycled coarse aggregate with a substitution rate of 100% is used, and the indicators of the recycled coarse aggregate should comply with the "General Concrete Stone Quality Standards and Inspection Methods", and the recycled coarse aggregate should be It meets the requirements of "Specification for Recycled Coarse Aggregate for Concrete". Concrete was prepared according to the proportion shown in Table 5.

[0031] Table 5 concrete mix ratio

[0032] Cement P.O42.5

230kg

Class II fly ash

61kg

S95 grade mineral powder

51kg

SP404 superplasticizer

6.27kg

water

191kg

Sand in zone II with a fineness modulus of 2.8

776kg

recycled coarse aggregate

1005kg

[0033] The method is as follows: put 776kg of natural sand, 1005kg of recycled coarse aggregate and 57.3kg of water into a stationary mixer, and stir for 15 seconds; then add 230kg of...

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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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