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Test method for evaluating contractility of neat cement paste

A technology for cement slurry and shrinkage performance, applied in the field of concrete, can solve the problems of large difference in test results and high cost of test methods, and achieve the effects of low cost, stable test data and high precision

Pending Publication Date: 2017-07-07
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the cost of the current test method is high or the test result is greatly different from the real value, thereby proposing a test method for evaluating the shrinkage performance of cement paste, which can accurately measure the shrinkage performance of cement paste under the premise of low cost. The shrinkage of the whole process after the self-pouring of the clean slurry

Method used

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  • Test method for evaluating contractility of neat cement paste
  • Test method for evaluating contractility of neat cement paste
  • Test method for evaluating contractility of neat cement paste

Examples

Experimental program
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Effect test

Embodiment 1

[0021] like figure 1 Shown, be a kind of embodiment of the present invention, a kind of test method of evaluating the shrinkage performance of cement slurry, make detachable mold and fix it on the supporting structure; Make cement slurry and pour in the detachable mold, record The original length of the test piece is L; a sealant is poured on the cement paste to seal it, and a metal sheet 2 is placed after the sealant cools, and the length of the test piece is measured with a measuring device and the initial reading is recorded l 0 ; Every once in a while, record the reading l of the measuring device at time t t ;Remove the detachable mold 3 days after pouring, and continue to measure and record the length of the test piece until the test is terminated on 28 days, which can realize the shrinkage measurement of the whole process of cement paste self-pouring; calculate the strain ε of cement paste t , get the shrinkage strain of the cement paste at time t, and draw the strain c...

Embodiment 2

[0031] By adjusting the fineness and dosage of fly ash and slag, four groups of cementitious materials with a mineral admixture content of 60% were prepared to study the influence of mineral admixtures on the shrinkage value of cement paste. See Table 1 for details. Test results such as figure 2 shown.

[0032] Table 1 test mix ratio

[0033]

[0034] Depend on figure 2 It can be seen that the shrinkage values ​​of cement-based materials mixed with different finenesses and amounts of fly ash and slag are significantly different, and the shrinkage curves of cement pastes with different mix ratios are basically the same, and the stability of the test data is good.

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Abstract

The invention discloses a test method for evaluating the contractility of neat cement paste. The method comprises the steps of manufacturing a detachable mold and fixing the mold onto a supporting structure; preparing neat cement paste, pouring the neat cement paste into the detachable mold, and recording the original length L of a test piece; pouring a sealant onto the neat cement paste to seal the neat cement paste, and after the sealant is cooled, measuring the length of the test piece using a measuring device and recording the initial reading l0; recording the reading lt of the measuring device at the moment t every a period of time; detaching the detachable mold in 3 days after the pouring is ended, and continuously measuring and recording the length of the test piece till the test is terminated on the 28th day, thus realizing whole-process contractility measurement after pouring of the neat cement paste; and calculating the strain epsilon t of the neat cement paste to obtain the contraction strain of the neat cement paste at the moment t, and drawing a strain curve changing with time. Through simple experimental devices, the method can realize whole-process contractility measurement after pouring of the neat cement paste and evaluate the contractility of the neat cement paste having different proportions.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a test method for evaluating the shrinkage performance of cement paste. Background technique [0002] With the widespread application of reinforced concrete structures in construction projects, a series of durability problems are accompanied. Concrete cracking is an important cause of its durability deterioration, therefore, reducing or eliminating concrete cracks is very important to improve the durability of concrete structures. Shrinkage cracks caused by concrete shrinkage account for 80% of the total cracks. To reduce concrete cracks, the shrinkage deformation of concrete must be controlled first. Therefore, it is urgent to study the shrinkage deformation of cement paste. [0003] At present, the methods for testing the shrinkage deformation of cement paste at home and abroad include non-contact method and contact method. The non-contact method mainly pre-embeds the senso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/38
CPCG01N33/383
Inventor 赵庆新单心宇王冬丽潘慧敏兰永秋金鹭云毕弘毅
Owner YANSHAN UNIV
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