Reducing Thermal and Autogenous Shrinkage Contributions to Early-Age Cracking
作者：
DOI: 10.14359/19904
关键词: Materials science 、 Microstructure 、 Compressive strength 、 Cement 、 Cracking 、 Curing (chemistry) 、 Portland cement 、 Composite material 、 Mortar 、 Shrinkage
摘要: Early-age cracking continues to be a significant problem for new concrete construction. Two of the major contributors such are heat released by cement hydration during first few days curing and autogenous shrinkage that often occurs same time frame. In this paper, three potential alternatives reducing these contributions modifying mixture proportions investigated, namely increasing water-cement ratio (w/c), using coarser cement, or replacing portion portland with coarse limestone powder. Each alternative reduces generated per unit volume either volumetric content its early-age reactivity, interparticle spacing between grains in three-dimensional microstructure. These reductions quantified paste mortar systems measuring their semi-adiabatic temperature rise deformation along measurements compressive strength indicate trade-off will experienced risk cracking. mixtures each have additional advantage they should result cost savings comparison an initial (control) mixture.
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