Laboratory mix proportion design method of permeable recycled aggregate concrete

A technology of mix proportion design and recycled aggregate, applied in the direction of calculation, special data processing applications, instruments, etc., can solve the problems of many cracks in recycled aggregate, low reliability, large dispersion of design results, etc., and achieve small quality fluctuations. Effect

Active Publication Date: 2016-12-14
SHANDONG JIAOTONG UNIV
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Problems solved by technology

Europe, the United States, Japan and South Korea attach great importance to the recycling of construction waste, while my country's research and utilization started relatively late, and mature technical specifications have not yet been formed. The current design method of ordinary concrete is generally referred to in its mix design, but the recycled aggregate of construction waste Different from the characteristics of natural sand and gravel, such as recycled aggregates with many cracks, high water absorption, and large fluctuations in design mix test results, resulting in large dispersion of design results and reduced reliability, in order to better utilize buildings as resources Garbage, reduce waste, it is of great significance to invent a laboratory mix design method for permeable recycled aggregate concrete

Method used

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  • Laboratory mix proportion design method of permeable recycled aggregate concrete
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  • Laboratory mix proportion design method of permeable recycled aggregate concrete

Examples

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Embodiment 1

[0065] A design method for laboratory mix ratio of C15 permeable concrete using construction waste recycled aggregates, including the following parts by weight of raw materials: cement: water: natural sand: recycled sand: recycled coarse aggregate (1): recycled coarse aggregate ( 2)=252:51:63:57:1021:448. Among them, the target void ratio is 18%, the water-cement ratio is 0.20, the sand ratio is 8%, and the design quality of the recycled coarse aggregate (1), (2) is the surface dry quality.

[0066] Among them, the cement is ordinary Portland cement with a strength grade of P.O42.5; recycled coarse aggregate (1) is 5-25mm, recycled coarse aggregate (2) is 5-10mm, and its surface dry density is 2.314g / cm 3 , 2.286g / cm 3 , The water absorption rate is 5.8%, 8.3%, the blending ratio of recycled coarse aggregate (1), (2) is 70:30, and the tamped density of the mixed recycled coarse aggregate is 1407kg / m 3 ; Reclaimed sand is medium sand, fineness modulus is 2.87, apparent density is...

Embodiment 2

[0072] A design method for laboratory mix ratio of C20 permeable concrete using construction waste recycled aggregates, including the following parts by weight of raw materials: cement: water: natural sand: recycled sand: recycled coarse aggregate (1): recycled coarse aggregate ( 2)=310:84:126:116:1021:448. Among them, the target void ratio is 15%, the water-cement ratio is 0.27, the sand ratio is 15%, and the design quality of the recycled coarse aggregate (1), (2) is the surface dry quality.

[0073] Among them, the cement is ordinary Portland cement with a strength grade of P.O42.5; recycled coarse aggregate (1) is 5-25mm, recycled coarse aggregate (2) is 5-10mm, and its surface dry density is 2.314g / cm 3 , 2.286g / cm 3 , The water absorption rate is 5.8%, 8.3%, the blending ratio of recycled coarse aggregate (1), (2) is 50:50, and the tamped density of the mixed recycled coarse aggregate is 1298kg / m 3 ; Reclaimed sand is medium sand, fineness modulus is 2.87, apparent density...

Embodiment 3

[0080] A method for designing a laboratory mix ratio of C40 permeable concrete using construction waste recycled aggregates, including the following parts by weight of raw materials: cement: water: natural sand: recycled sand: recycled coarse aggregate (1): recycled coarse aggregate ( 2)=355:71:98:90:1021:448. Among them, the target void ratio is 10%, the water-cement ratio is 0.3, the sand ratio is 12%, and the design quality of the recycled coarse aggregates (1) and (2) are both surface dry quality.

[0081] Among them, the cement is Portland cement with a strength grade of P.Ⅱ52.5; recycled coarse aggregate (1) is 5-25mm, recycled coarse aggregate (2) is 5-10mm, and its surface dry density is 2.314g / cm. 3 , 2.286g / cm 3 , The water absorption rate is 5.8%, 8.3%, the blending ratio of recycled coarse aggregate (1), (2) is 60:40, and the tamped density of the mixed recycled coarse aggregate is 1349kg / m 3 ; Reclaimed sand is medium sand, fineness modulus is 2.87, apparent density i...

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Abstract

The invention provides a laboratory mix proportion design method of permeable recycled aggregate concrete. The laboratory mix proportion design method is adaptable to characteristics of more cracks, high water absorption rate and large design mix proportion experimental result volatility of building rubbish recycled aggregates. Compared with a common concrete mix proportion design method, by the aid of an experiment and calculation combined method and a framework volume filling method, double-control indexes design void ratio and compressive strength serve as a main design target, and a recycled coarse-fine aggregate and natural sand serve as design references of a surface dry state and an air drying state respectively. The design method is simple, practical, narrow in fluctuation range, less in cement content, high in recycling degree, economical and environmentally friendly, quality is easily controlled, and addition agents and admixtures are omitted.

Description

Technical field [0001] The invention is a simple, practical, easy-to-controllable quality laboratory mixing ratio design method for permeable recycled aggregate concrete with a small fluctuation range aiming at the characteristics of recycled aggregates mainly based on solid waste of construction concrete. Background technique [0002] With the rapid development of urban housing construction and infrastructure construction in China, a large number of buildings need to be demolished in urban expansion projects, and various solid wastes such as building slag and construction concrete waste are increasing. Europe, the United States, Japan, and South Korea attach great importance to the recycling of construction waste. However, China's research and utilization started late and have not yet formed a mature technical specification. In its mix design, the current design method of ordinary concrete is generally referred to, but construction waste is recycled aggregate The characteristics...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/13
Inventor 张爱勤王彦朱峰李传军张旭董波王晓龙阚涛
Owner SHANDONG JIAOTONG UNIV
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