Method used for measuring cement mortar rheological parameters

A technology of cement mortar and rheological parameters, which is applied in the field of testing the plastic viscosity and yield stress of cement mortar, can solve the problems of complex data processing, unsuitability for measuring rheological parameters of mortar, and complicated testing process, and achieve good repeatability, It is conducive to popularization and use, and the effect of simplifying the data processing process

Inactive Publication Date: 2017-04-19
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the test process is relatively complicated, and a camera with a frame rate of not less than 60 frames or a camera with a camera function is required. The data processing is relatively complicated, and it is not suitable for rapid determination of the rheological parameters of mortar at the engineering site.

Method used

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  • Method used for measuring cement mortar rheological parameters
  • Method used for measuring cement mortar rheological parameters
  • Method used for measuring cement mortar rheological parameters

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Such as figure 1 As shown, the charging device selected in this embodiment is that the inner diameter of the cylinder part is 70mm, and the height is 236mm; The diameter is 80mm, and the height from the inner bottom of the receiving measuring cylinder to the outlet of the funnel is 348mm.

[0037] The mortar mix ratio used is: China Resources 42.5R cement 328kg / m 3 , ISO standard sand 1336kg / m 3 , Class II fly ash 164kg / m 3 grams, finely ground slag powder (S95) 109kg / m 3 , Polycarboxylate superplasticizer 5.8kg / m 3 , water 282kg / m 3 . The measured density of cement mortar is 2226kg / m 3 .

[0038] 1) The test data according to DV playback and calculation are shown in Table 1, figure 1 shown.

[0039] Among them, shear stress = measured density of mortar × volume of upper mortar

[0040]Shear rate = falling distance of the i-th 100ml mortar / falling time of the i-th 100ml mortar = [348-23(i-1)] / Ti

[0041] i refers to the i-th 100mL mortar, T i Refers to the ...

Embodiment 2

[0054] Such as figure 1 As shown, the charging cylinder is vertically fixed on the central axis of the bracket, the receiving measuring cylinder is placed directly below the charging cylinder, the axes of the charging cylinder and the receiving measuring cylinder coincide, and the stopwatch is placed on the outer circumference of the receiving measuring cylinder; The upper part of the material cylinder is cylindrical, and the lower part is funnel-shaped; the height from the inner bottom of the receiving measuring cylinder to the outlet of the funnel is 348mm; first block the outlet of the funnel, mix 1000mL of mortar and put it into the upper charging cylinder; then loosen Open the outlet of the funnel and let the mortar drop freely into the lower receiving measuring cylinder; use a stopwatch to record the total time T of 800ml mortar falling 总 .

[0055] Specifically, the charging device selected in this embodiment is that the inner diameter of the cylinder part is 70mm, and...

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Abstract

The invention discloses a method used for measuring cement mortar rheological parameters. According to the method, mortar plastic viscosity mu and yield stress tau<0> are calculated based on a formula 1 and a formula 2 respectively; dispersion degree K is measured via a method disclosed in GB 50119-2013 <concrete additive application technical standards>; the total time T<total> of 800ml cement mortar falling is measured via following steps: the outlet of a funnel is blocked firstly, 1000ml of mortar is prepared via stirring, and is delivered into an upper loading barrel, then the outlet is unblocked so as to realize free falling of the mortar into a lower material receiving measuring cylinder, and the total time T<total> of 800ml cement mortar falling is recorded using a second chronograph. According to the method, no DV is needed to record the whole experiment process; data processing is simplified; detection results can be obtained conveniently and rapidly; and it is more beneficial for popularization and application in engineering field. The measuring results of the method are not influenced by the size of sand particles of mortar; mortar using amount of each time is small; and both manpower and material resources are saved.

Description

technical field [0001] The invention relates to a method for testing the rheological properties of cement mortar, in particular to an engineering practical method for testing the plastic viscosity and yield stress of cement mortar. Background technique [0002] The working performance of a concrete mixture is a general term for its consistency, plasticity and ease of modification; for high-performance concrete, it should also include the concepts of filling, pumpability and stability. At present, concrete slump and expansion methods are widely used in engineering to characterize the working performance of concrete, but concrete slump and expansion can only reflect the fluidity of concrete, and cannot reflect the consistency, filling and stability of concrete. This will lead to the occurrence of concrete segregation, bleeding and other phenomena because the consistency of some concrete meets the requirements, although its fluidity is too small. [0003] Cement mortar is the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N11/06
CPCG01N11/06
Inventor 吴笑梅高强刘沙沙黄定策田亚坡樊粤明
Owner SOUTH CHINA UNIV OF TECH
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