Method for testing maximum wrapping layer thickness of slurry at aggregate surface in permeable concrete

A technology of permeable concrete and testing method, applied in the direction of measuring device, specific gravity measurement, analyzing materials, etc., can solve the problems of complicated operation and poor flexibility, etc.

Active Publication Date: 2018-07-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is greatly affected by the subjective experience of the operator, the operation is complex and the flexibility is poor, and it is necessary to determine the ratio through multiple trial and error experiments

Method used

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  • Method for testing maximum wrapping layer thickness of slurry at aggregate surface in permeable concrete
  • Method for testing maximum wrapping layer thickness of slurry at aggregate surface in permeable concrete
  • Method for testing maximum wrapping layer thickness of slurry at aggregate surface in permeable concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] combine figure 2 As shown, the test method for the maximum coating thickness of aggregate surface slurry in pervious concrete includes the following steps:

[0029] The first step: prepare the slurry, and then test the density ρ of the slurry;

[0030] Step 2: Test the total surface area S of the aggregate;

[0031] Step 3: Test the maximum wrapping mass of aggregate surface slurry m P ;

[0032] Step 4: Calculate the maximum coating thickness of the slurry on the surface of the aggregate

[0033] Repeat the first step, the second step, the third step, and the fourth step several times; take the maximum coating layer thickness e of the aggregate surface slurry M average value.

[0034] The cement slurry is the slurry, and the test procedure of the slurry density ρ is as follows: prepare the slurry according to the GB / T 1346-2011 standard, and then divide the prepared slurry into a volume of V C , the mass is m c1 In the same container, use a concrete vibrating...

Embodiment 2

[0046] Except for the following technical features, the rest of the unsubmitted technical features are the same as in Embodiment 1.

[0047] 100 parts of Portland cement, 25 parts of water, and 1 part of water reducing agent were used to prepare slurry according to the method used in Example 1, and the density of the slurry was measured to be 2.211g / cm 3 . After cleaning and drying the aggregates with a particle size of 4.75-9.5mm, randomly select 200 aggregates, and use a hydrostatic balance to test the total volume of 41.4cm 3 , the average volume of the calculated aggregate is 0.207cm 3 ; Assuming the aggregate is an ideal spherical shape, the average radius of the aggregate is calculated to be 3.67mm; the surface area of ​​the aggregate per unit volume obtained is 8.174cm -1 (β=1) and the total surface area of ​​the aggregate is 338.4cm 2 . Wipe the aggregate with a towel until it is saturated and surface-dry, and weigh its mass of 106.62g; weigh 91.54g of clean pulp a...

Embodiment 3

[0049] Except for the following technical features, the rest of the unsubmitted technical features are the same as in Embodiment 1.

[0050] 60 parts of Portland cement, 40 parts of superfine slag, 25 parts of water, and 1 part of water reducing agent were used to prepare slurry according to the method used in Example 1, and the density of the slurry was measured to be 2.158g / cm 3 . Washed and dried volume is 154.3cm 3 aggregate. Use a sampling sieve to classify it into two particle size ranges of 5-10mm and 10-16mm, and use a hydrostatic balance to measure its volume as 27.0cm 3 and 127.3cm 3 . Randomly take 50 aggregates of 5-10mm, and measure its volume to be 11.6cm 3 , calculate its average volume to be 0.232cm 3 ; Assuming that the aggregate is an ideal spherical shape, the average radius of the aggregate is calculated to be 3.81mm, and the surface area per unit volume of the aggregate is 7.874cm -1 (β=1); then 27.0cm 3 The total surface area of ​​the 5 ~ 10mm agg...

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Abstract

The invention relates to a method for testing the maximum wrapping layer thickness of slurry at the aggregate surface in permeable concrete, which comprises the steps of first, preparing slurry, and then testing the density [rho] of the slurry; second, testing the total surface area S of aggregate; third, testing the maximum wrapping mass mP of the slurry at the aggregate surface; and fourth, calculating the maximum wrapping layer thickness eM of the slurry at the aggregate surface, wherein eM=mP / [rho]S. The testing method comprises slurry density testing, aggregate surface area testing and aggregate surface slurry maximum wrapping mass testing, and thus the actual maximum wrapping layer thickness of the slurry at the aggregate surface is calculated. The testing device and method providedby the invention can scientifically determine the maximum wrapping layer thickness of the slurry, thereby providing theoretical guidance for mix proportion design of the permeable concrete, and havingimportance practical significance.

Description

technical field [0001] The invention belongs to the technical field of building material testing, and in particular relates to a testing method for the maximum coating layer thickness of aggregate surface slurry in permeable concrete. Background technique [0002] Permeable concrete is a kind of porous lightweight concrete that is made by mixing coarse aggregate, a small amount of fine aggregate, cement and other cementitious materials, water and admixtures, and formed by vibrating or compacting. A thin layer of cement paste is bonded to each other to form a honeycomb structure with interconnected and evenly distributed pores, which endows concrete with good environmental compatibility such as air permeability and water permeability, and has attracted extensive attention from scholars and engineering fields. In recent years, with the gradual advancement of sponge city construction, the demand for high-strength and high-permeability concrete is increasing, and the design and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B21/08G01N9/04
CPCG01B21/08G01N9/04
Inventor 张同生谢晓庚杨永民林梓宇韦江雄余其俊罗宏鹏乔瑞龙颜华君龙坤明
Owner SOUTH CHINA UNIV OF TECH
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