Chemical and thixotropic contribution to the structural build-up of cementitious materials

被引：10

作者：

Zhang, Kun ^{[1
]}

Mezhov, Alexander ^{[1
]}

Schmidt, Wolfram ^{[1
]}

机构：

[1] Bundesanstalt Mat Forsch & Prufung BAM, Unter Eichen 87, D-12205 Berlin, Germany

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2022年 / 345卷

关键词：

Thixotropy; Structural build-up; Penetration test; Rheological properties; DYNAMIC-MODE RHEOLOGY; YIELD-STRESS; ELASTIC-MODULUS; INDENTATION; BEHAVIOR; PASTE; PERFORMANCE; PRESSURE; CONCRETE; FLUID;

D O I：

10.1016/j.conbuildmat.2022.128307

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The structural build-up of fresh cement paste is often considered as a purely thixotropic phenomenon in literature even though cementitious materials undergo a non-reversible hydration process that can have an influence on the structuration process. In the current paper a method is proposed to validate the impact of the non-reversible structural build-up. It is shown that fresh cement paste samples lose their structural gain almost completely due to thixotropy while the structural build-up due to hydration can be observed but occurs in a significantly lower order of magnitude over the course of the first hours of hydration. In addition, it is shown, that the chemical component of the structural build-up accelerates with the onset of the acceleration period of hydration, while its contribution in the entire structural build-up remains constant.

引用

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页数：10

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