Method for evaluating soundness of high-MgO cement

A technology of stability and cement, applied in the field of evaluating the stability of high MgO cement, can solve the problem of inability to accurately evaluate the stability of high MgO cement, and achieve the effect of simple operation and stable reaction process.

Active Publication Date: 2014-04-09
CHINA BUILDING MATERIALS ACAD
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Problems solved by technology

[0007] The purpose of the present invention is to propose a method for evaluating the stability of high MgO cement to solve the pro

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  • Method for evaluating soundness of high-MgO cement

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Embodiment Construction

[0015] The present invention will be described in further detail below in conjunction with specific examples, but not as a limitation of the present invention.

[0016] In the low-heat Portland cement (KH=0.86+0.02, n=0.80+0.02, p=0.80+0.02) produced by Sichuan Jiahua Cement Co., Ltd., adjust the ratio of raw materials so that MgO in clinker=4.95%, 5.99 %, 7.03%, 7.43%, 8.06%, 8.16%. According to the traditional GB / T750 test method, the method for evaluating the stability of high MgO cement used in hydraulic concrete according to the present invention, and the concrete autogenous volume deformation test, the results are shown in Table 1.

[0017] The present invention evaluates the method for the high MgO cement stability of hydraulic concrete, comprises the following steps:

[0018] Step 1, mix the high MgO cement to be tested, ISO standard sand, and water according to the weight ratio of 450:1350:225 to prepare mortar;

[0019] Step 2, use the mortar prepared in step 1 to ...

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Abstract

The invention discloses a method for evaluating the soundness of high-MgO cement. The method comprises the following steps of 1. mixing high-MgO cement to be tested, ISO (international standard organization) standard sand and water in the weight ratio of 450:1,350:225 to prepare mortar; 2. preparing a specimen by utilizing the mortar prepared by the step 1, measuring the initial length of the specimen after the specimen is de-molded, boiling the specimen in water being 100 DEG C for 3 to 6 hours, and autoclaving the specimen at 216 DEG C for 3 to 6 hours; 3. measuring the length of the specimen which is autoclaved in the step 2, calculating a length change rate according to the length after autoclaving and the initial length, and representing the volume stability of the hardened high-MgO cement by using the calculated length change rate. The evaluation method is easy to operate and applicable to the evaluation of chilling shrinkage resisting cement soundness of mass concrete, a reaction process is stable, and complex reaction equipment is not required.

Description

technical field [0001] The invention relates to the technical field of cement performance detection, in particular to a method for evaluating the stability of high MgO cement. Background technique [0002] After cement and water are mixed, volume shrinkage occurs due to carbonization, chemical reactions and temperature changes during the hardening process. During the hardening process of hydraulic concrete, temperature shrinkage has a greater influence. The volume expansion of cement in hydraulic concrete can be improved by controlling MgO (periclase), CaO or sulfate in cement to a certain extent. This method is one of the important ways to counteract the shrinkage of hydraulic dam concrete due to temperature drop. If the hydration process of the expansion source is well controlled and can match the shrinkage of the cement mineral hydration process, it will have a positive effect on the volume stability of hydraulic concrete. Among CaO, MgO, and sulfate expansion sources,...

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Application Information

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IPC IPC(8): G01N33/38G01B21/02
Inventor 姚燕刘晨王显斌王昕刘云
Owner CHINA BUILDING MATERIALS ACAD
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