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Method for measuring pressure water absorption rate of haycite and method for reducing pressure slump loss of haycite concrete pump

A technology of ceramsite concrete and measurement method, which is applied in the direction of chemical instruments and methods, clay preparation equipment, mixing operation control, etc., and can solve the problems of increased slump loss of concrete

Active Publication Date: 2015-10-07
济南四建(集团)有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the above-mentioned problems existing in the prior art, and provides a method for measuring the pressure water absorption rate of ceramsite in concrete and determining the appropriate mixing water surplus through the measured ceramsite pressure water absorption rate to reduce the slump of ceramsite concrete The method of slump loss, the method of the present invention can solve the problem that the slump loss of concrete is increased due to the large amount of water absorbed by ceramsite in the concrete cement slurry during transportation and pumping

Method used

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  • Method for measuring pressure water absorption rate of haycite and method for reducing pressure slump loss of haycite concrete pump
  • Method for measuring pressure water absorption rate of haycite and method for reducing pressure slump loss of haycite concrete pump
  • Method for measuring pressure water absorption rate of haycite and method for reducing pressure slump loss of haycite concrete pump

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Example 1: Reducing the slump loss of ceramsite concrete under pump pressure by measuring the pressure water absorption rate of ceramsite

[0036] The raw material is shale ceramsite concrete, and the steps are:

[0037] 1) Determination of pressure water absorption of ceramsite: uniformly select 8 pressure values ​​P in the range of 0-5MPa 1 ~P 8 , followed by 1 MPa, 1.5 MPa, 2 MPa, 2.5 MPa, 3.5 MPa, 4 MPa, 4.5 MPa, 5MPa, respectively measured P 1 ~P 8 Corresponding ceramsite pressure water absorption under pressure W Y1 ~W Y8 ;

[0038] The method for measuring water absorption under pressure of ceramsite in step 1) is as follows: a) Take a sample of shale ceramsite with a particle size of 5-10mm to be tested, dry it in a blast dryer at 105±5°C to constant weight, and weigh it to obtain a dry ceramsite sample. Grain sample mass m 0 ; b) Soak the weighed dry ceramsite sample in water for 24 ± 2 hours, absorb water to saturation under normal pressure, then pl...

Embodiment 2

[0053] Example 2: Decreasing the slump loss of ceramsite concrete under pump pressure by measuring the pressure water absorption rate of ceramsite

[0054] Raw material is clay ceramsite concrete, and step is with embodiment 1:

[0055] According to the test pressure of 1 MPa, 1.5 MPa, 2 MPa, 2.5 MPa, 3.5 MPa, 4 MPa, 4.5 MPa, and 5 MPa, the same batch of clay ceramsite was tested for pressure water absorption. The test results are shown in Table 4.

[0056] Table 4 Pressure water absorption of shale ceramsite under different pressures

[0057]

[0058] With the test pressure P i The increase of the measured ceramsite pressure water absorption w Yi Gradually increase, when the test pressure increases to above 2.5MPa, the range of increase of ceramsite pressure water absorption becomes flat, and the second derivation of ceramsite pressure water absorption to test pressure (ie △ 2 w Yi / △P i 2 ) is the inflection point of the pole curve when it is zero, that is, the ...

Embodiment 3

[0066] Example 3: Comparison of the effects of the conventional method and the method of the present invention for determining the pressure water absorption of ceramsite

[0067] The pressure water absorption test was carried out on the same batch of shale ceramsite, and the measured pressure was 3.0MPa (see Table 1 for the measurement results). The pressure water absorption of ceramsite was measured according to the conventional method and the method of the present invention respectively. The number of samples is not less than 3 groups), the number of samples determined by the two methods is statistically calculated, and the standard deviation of the samples is compared.

[0068] 1. Conventional method to measure water absorption of ceramsite

[0069] (1) The specific method is:

[0070] The first step is to measure the saturated water absorption W of ceramsite under normal pressure G , take about 3000g~4000g of the shale ceramsite sample to be tested, with a particle si...

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Abstract

The invention discloses a method for measuring the pressure water absorption rate of haycite and a method for reducing the pressure slump loss of a haycite concrete pump, provides a haycite pressure water absorption rate concept, realizes measurement by a method for jointly measuring a test sample by soaking the test sample in water, and further provides a method for reducing the slump loss of haycite concrete by determining a corresponding mixing water surplus according to the measured pressure water absorption rate of the haycite. According to the method, the problem of increase of the slump loss of concrete caused by a fact that the haycite adsorbs a large amount of water in concrete cement slurry easily in conveying and pumping processes can be solved.

Description

technical field [0001] The invention belongs to the technical field of detection methods for concrete working performance and preparation control of ceramsite concrete, and relates to a method for measuring the pressure water absorption rate of ceramsite in concrete and a method for determining the appropriate mixing water abundance through the measured ceramsite pressure water absorption rate To reduce the slump loss of ceramsite concrete. Background technique [0002] Ceramsite concrete is a kind of lightweight aggregate concrete. The internal structure of lightweight ceramsite is characterized by fine and dense honeycomb micropores that are not connected to each other. These micropores are formed due to the gas being enclosed in the shell, and include open pores and closed pores. Due to the loose and porous structure inside the ceramsite, the ceramsite concrete is pumped to the formwork pouring process, and the water in the cement slurry will gradually enter the clos...

Claims

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Application Information

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IPC IPC(8): G01N5/02B28C7/04
Inventor 李海波张冬陈朋强邢庆毅宫文晋
Owner 济南四建(集团)有限责任公司
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