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1 Prace Naukowe Instytutu Budownictwa Politechniki Wrocławskiej. Konferencje

1 2001

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Volume changes of cement composites at early stages of setting and hardening

Kolar K., Klecka T., Kolisko J.

Prace Naukowe Instytutu Budownictwa Politechniki Wrocławskiej. Konferencje

2001

Vol. 80, nr 29

99-104

The course of volume changes of binding systems and composites on their base, processed so called "wet way", is one of very important factors that have a significant influence on a long durability of their hardened products. Details of a time-course and a size of volume changes are as important for design of building constructions as proper strength-elastic characteristics of building materials and structures are. It's necessary to look at a time-course of strength-elastic characteristics of hydraulic hardened composites in their direct connection with a time-course of their volume changes. There are concerned especially a course and a size of volume changes at an initial state of hydration, i.e. at the moment of a transition of a suspension form of a binder into a rigid phase, when the solid structure of the material begins to form itself. Volume changes (expansion or shrinkage) can be manifested by cracks influencing negatively all utility properties of the composite, if m! aximal tensile stress of formed rigid structure is exceeded. Some results of experimental measurements of a course and a size of volume changes at an initial state of hydration are presented in the following text and figures.