A method for measuring water absorption under pressure of ceramsite and a method for reducing slump loss of ceramsite concrete under pump pressure

A technology for ceramsite concrete and slump loss, which is applied in chemical instruments and methods, clay preparation devices, mixing operation control, etc., and can solve problems such as increased slump loss of concrete

Active Publication Date: 2017-11-07
济南四建(集团)有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A method for measuring water absorption under pressure of ceramsite and a method for reducing slump loss of ceramsite concrete under pump pressure
  • A method for measuring water absorption under pressure of ceramsite and a method for reducing slump loss of ceramsite concrete under pump pressure
  • A method for measuring water absorption under pressure of ceramsite and a method for reducing slump loss of ceramsite concrete under pump pressure

Examples

Experimental program
Comparison scheme
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 1MPa, 1.5 MPa, 2 MPa, 2.5 MPa, 3.5 MPa, 4 MPa, 4.5 MPa, 5MPa, 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 place it in a contai...

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 satu...

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 size ...

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Abstract

The invention discloses a method for measuring the pressure water absorption rate of ceramsite and a method for reducing the slump loss of ceramsite concrete pump pressure, and proposes the concept of ceramsite pressure water absorption rate and adopts the method of immersing the sample in water and weighing together. Determination, and provides a method for determining the appropriate mixing water margin to reduce the slump loss of ceramsite concrete through the measured ceramsite pressure water absorption rate. The problem of increased slump loss of concrete is caused by ceramsite absorbing a large amount of water in concrete slurry.

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 closed m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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