SUGGESTIONS FOR CALCULATION OF RELATIVE STRAIN OF THE TOTAL SHRINKAGE OF EXPANDED CLAY CONCRETE

Abstract

The article provides an analytical review of studies on the shrinkage strain development of expanded clay concrete, based on which it was established that a significant factor is the local raw material base. It means that for each region it is important to accumulate experimental data and correct design models for the analytical determination of the total shrinkage strain. In this regard, the task of the study was to develop suggestions for calculating the relative strain of the total shrinkage of expanded clay concrete, made on the basis of the local raw material base. Predicated on the results of the study and according to the provisions of SP 5.03.01 and Eurocode 2, the improved model for the analytical determination of the values of relative strain of the total shrinkage of structural expanded clay concrete was developed. The proposed model takes into account the value of cement activity as a determining factor of the cement stone strength, and it takes into account the water-cement ratio and the coarse aggregate volume. The proposed design model makes it possible to determine with sufficient accuracy the value of the relative strain of the total shrinkage of expanded clay concrete at the age of 28 to 120 days.