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Method for calculating compressive strength of pervious concrete

A technology of permeable concrete and compressive strength, which is applied in the direction of strength characteristics, the use of stable tension/pressure test material strength, and measuring devices, which can solve the problems of internal structure influence, large dispersion of results, etc., and achieve the effect of quality assurance

Pending Publication Date: 2022-01-28
MIANYANG LIANGGU TECH +1
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Problems solved by technology

[0006] Since the interior of permeable concrete is mostly point-to-point contact and the intercalation force between aggregates supports its overall structure, the distribution of aggregates and cementitious materials is also scattered, and the dispersion of test results is also large, and core drilling The sampling process will have a greater impact on its internal structure

Method used

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  • Method for calculating compressive strength of pervious concrete
  • Method for calculating compressive strength of pervious concrete
  • Method for calculating compressive strength of pervious concrete

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Embodiment

[0052] The relationship between the apparent density and compressive strength of permeable concrete for standard cubic specimens, drill core sampling specimens, and pre-embedded cylindrical specimens:

[0053] Drill core sample specimen:

[0054] h=100mm f=-30.84+0.17ρ B R 2 100 =0.66 (1)

[0055] h=150mm f=-27.09+0.15ρ B R 2 150 =0.72 (2)

[0056] h=200mm f=-24.16+0.14ρ B R 2 200 =0.73 (3)

[0057] Embedded cylindrical specimen:

[0058] h=100mm f=46.72+0.03ρ B R 2 100 =0.74 (4)

[0059] h=150mm f=-46.78+0.03ρ B R 2 150 =0.91 (5)

[0060] h=200mm f=-49.92+0.03ρ B R 2 200 =0.85 (6)

[0061] Standard cubic specimen: f=-93.95+0.05ρ B R 2 =0.83 (7)

[0062] In the formula:

[0063] f—compressive strength, MPa;

[0064] ρ B —Apparent density, kg / m 3 ;

[0065] R 2 - Goodness of fit (the closer the reading is to 1, the closer the fitted value is to the experimental value).

[0066] Table 1 Experimental Research Mix Ratio

[0067]

[0068]...

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Abstract

The invention provides a method for calculating the compressive strength of pervious concrete, which comprises the following steps of: on the basis of certain correlation between the strength of the concrete and the apparent density of the concrete, after the pervious concrete is formed, obtaining a test piece in a core drilling sampling or embedded part manner, testing the apparent density of the concrete test piece and the corresponding 28d-age compressive strength, and then performing linear regression analysis by taking the apparent density as a horizontal axis and the 28d-age compressive strength as a longitudinal axis to obtain a relational expression between the 28d-age compressive strength and the apparent density. Compared with an existing method for predicting the compressive strength of the on-site pervious concrete by using an indoor manufactured standard test piece, the method disclosed by the invention can avoid the influence of a size effect generated by non-uniform test pieces on the compressive strength, and whether the compressive strength of the premixed concrete at the 28d age meets the requirement can be predicted by substituting the apparent density obtained by testing into a fitting equation.

Description

technical field [0001] The invention belongs to the technical field of predicting the strength of permeable concrete on site, and in particular relates to a method for calculating the compressive strength of permeable concrete. Background technique [0002] Neithalath et al established an equation for estimating the permeability coefficient of pervious concrete by studying the pore structure (porosity, pore size, connectivity) and distribution of pervious concrete and combining the Kozeny-Carman equation. Rui Zhong studied the relationship between total porosity, aggregate particle size, average pore size and compressive strength of pervious concrete. The pore size distribution density is calculated from the statistically extracted pore size distribution and incorporated into a semi-empirical model to predict the compressive stress-strain behavior of pervious concrete. The accuracy of the prediction results is demonstrated by comparing the test results with the strength pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0003G01N2203/0019
Inventor 李谦陈代果杨航姚勇李秋实任耕北刘玲黄晓惠
Owner MIANYANG LIANGGU TECH
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