Designing of mix ratio of high-performance recycled concrete

A technology of recycled concrete and mix ratio design, applied in the field of concrete

Inactive Publication Date: 2017-06-30
HUNAN CITY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, this status quo is difficult to achieve fundamental breakthroughs in large-scale engineering applications and commercial concrete levels

Method used

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  • Designing of mix ratio of high-performance recycled concrete
  • Designing of mix ratio of high-performance recycled concrete
  • Designing of mix ratio of high-performance recycled concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-8

[0041] A high-performance recycled concrete mix design, the method is as follows:

[0042] (1) Determine the preparation strength f′ of recycled concrete cu,0 :

[0043] The formula is as described in (I), f' cu,0 =f' cu,k +tσ (I);

[0044] (2) Determine the compressive strength of cement f ce :

[0045] The formula is as described in (II), f ce = γ c f ce,k (II);

[0046] (3) Regression coefficient of recycled aggregate α′ a ,α′ b value;

[0047] (4) Determine and calculate the water-cement ratio of recycled concrete

[0048] The formula is as described in (III),

[0049] (5) Calculation of additional water consumption of recycled concrete:

[0050] The formula is as described in (IV), m Δw =2.15%m RCAm Δw =2.15%m RCA (IV);

[0051] (6) Determine the unit water consumption of recycled concrete:

[0052] The formula is as described in (V), m' w0 =165+m Δw (V);

[0053] (7) Determine the amount of recycled concrete cement:

[0054] The formula is ...

Embodiment 8

[0064] Ordinary Concrete Mix Ratio

[0065] The basic idea of ​​the mix ratio design of ordinary concrete in my country is: the mix ratio design of concrete depends on the three parameters of water-cement ratio, water consumption and sand rate. According to the preparation strength of concrete and the actual strength of cement, the water-cement ratio is calculated by the Bolomy formula; the water consumption per unit cubic concrete is determined according to the slump and the maximum particle size of coarse aggregate, and then according to the coarse aggregate According to the maximum particle size and water-cement ratio, select the appropriate sand rate, and finally determine the amount of sand and gravel according to the volume method or mass method, and complete the mix ratio of concrete after trial mixing and adjustment. The following takes the preparation of ordinary concrete with a strength grade of C30 as an example to design the mix ratio of ordinary concrete.

[0066...

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Abstract

The invention discloses designing of the mix ratio of high-performance recycled concrete. Unlike common concrete, the aggregate of recycled concrete has high porosity and water absorption rate, coarse aggregates of different sources are greatly different in performance, and the particle strength and elastic modulus of the recycled concrete are thus low; so it is impossible for usage of a universally accepted strength formula as a base for designing of the mix ratio of the recycled concrete. Although a variety of strength formulas are brought forward at home and abroad, the strength formulas are all limited and cannot be practically applied since the problem of great difference among the performances of recycled aggregates cannot be handled.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a mix ratio design of high-performance recycled concrete. Background technique [0002] Since the durability and deformation properties of recycled concrete are lower than those of ordinary concrete, the structural performance of recycled concrete is reduced to varying degrees compared with ordinary concrete structures, which has become the biggest obstacle for the application of recycled concrete in structural engineering. The combined structure can make the strengths and weaknesses of two different materials, concrete (or reinforced materials such as steel fibers) and concrete, play their respective strengths and have a series of advantages. If the recycled concrete is applied to the composite structure, the structure can have the advantages of the composite structure and make up for the deficiency of the recycled concrete. Therefore, this will provide a broad prospect for th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B28/04C04B111/20
CPCC04B28/00C04B28/04C04B2111/00017C04B2111/20C04B14/06C04B14/02C04B18/16C04B2103/302C04B18/08C04B18/146
Inventor 余方殷灿彬
Owner HUNAN CITY UNIV
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