Assessment of concrete strength development models with regard to concretes with low clinker cements

Complex Effect of Concrete Composition on the Thermo-Mechanical Behaviour of Mass Concrete

“…The research program covered the following tests: physical and mechanical properties of cements, hydration heat of cements, compressive and tensile strength of concretes, elasticity modulus of concrete, concrete hardening temperature, thermal conductivity and heat capacity of concretes, concrete shrinkage, and creep. Some results of this extensive research have been already presented, including physical and mechanical properties of cements [3,7], hydration heat evolution under adiabatic conditions and isothermal conditions at 20 °C and 50 °C [3,7], compressive strength development of concrete with different cements [3,9], hardening temperature of concrete [3], thermal conductivity, and heat capacity [3]. Details of these tests and their results have been extensively described in previous works [3,7,9].…”

“…Some results of this extensive research have been already presented, including physical and mechanical properties of cements [3,7], hydration heat evolution under adiabatic conditions and isothermal conditions at 20 °C and 50 °C [3,7], compressive strength development of concrete with different cements [3,9], hardening temperature of concrete [3], thermal conductivity, and heat capacity [3]. Details of these tests and their results have been extensively described in previous works [3,7,9]. Not reported results are: development of compressive strength of concrete with different aggregate types, tensile strength development, Young’s modulus development, shrinkage and creep development of concrete with different constituents.…”

“…Such a replacement creates a binder which produces much less heat [7,8]. There is no doubt that the drawback of cements with non-clinker constituents is the strength gain, which is slower at early ages and may lessen the load-bearing capacity of the structure [9,10,11]. The slower strength gains at early ages is explained by the slower pozzolanic reaction of the slag and fly ash compared to Portland clinker.…”

“…The slower strength gains at early ages is explained by the slower pozzolanic reaction of the slag and fly ash compared to Portland clinker. However, it was proved that pozzolanic reactivity of slag and fly ash contributes to strength gain at later ages [9,10]. Experimental results in this field visibly show the crucial effect of the amount of non-clinker constituents in cement on concrete strength development [12].…”

Numerical identification of the thermal properties of early age concrete using inverse heat transfer problem

“…A wellknown solution to reduce the amount of generated heat is a partial replacement of Portland cement with a supplementary cementitious materials. Obviously, such modification of the binder composition changes not only strength development of concrete [2] or its heat release characteristics but also the thermal properties of hardening cement paste. Their values and the character of their changes in early age concrete could be a good starting point to refine models of young concrete like the one used by Zhou [3].…”