Abstract
In this research the equivalent age concept was used, in order to simulate strength development of heat treated sand concrete compared with ordinary concrete at different temperature, 35, 55, and 70°C, and validate the simulation results with our experimental results. Sand concrete is a concrete with a lower or without coarse aggregate dosage; it is used to realize thin element as small precast prestressed beams, in injected concrete or in regions where sand is in extra quantity and the coarse aggregate in penury. This concrete is composed by principally sand, filler, superplasticizer, water, and cement. The results show that the simulation of ordinary concrete was acceptable with an error lower than 20%. But the error was considerable for the sand concrete. The error was due to large superplasticizer dosage, which modified the hardening of sand concrete; the most influent parameter in Arrhenius law is apparent energy activation, to search for the value of the activation energy which gives the best simulation; a superposition is used of two curves of different temperature and with superplasticizer dosage 4% and several values of activation energy, 15, 20, 25, and 30 × 10 kcal. The simulation becomes ameliorated with the adequate value of activation energy.
Highlights
It is known that there is a relationship between temperature and characteristics of concrete, that is why many researchers had studied strength development of concrete based on temperature history and comes the maturity term [1] in the field of concrete industry
In this research the equivalent age concept was used, in order to simulate strength development of heat treated sand concrete compared with ordinary concrete at different temperature, 35, 55, and 70∘C, and validate the simulation results with our experimental results
The results show that the simulation of ordinary concrete was acceptable with an error lower than 20%
Summary
It is known that there is a relationship between temperature and characteristics of concrete, that is why many researchers had studied strength development of concrete based on temperature history and comes the maturity term [1] in the field of concrete industry. It has been shown that the development of cement hydration reactions as a function of time, expressed in produced heat quantity and for isothermal curing temperatures (of 20, 60, and 80∘C), has refined curves [2], which confirm that heat emission phase has independent variables system behavior (temperature and time) [2]. If the strength development of concrete can be considered as independent variables system (time/temperature), maturity of concrete in real age (t) exposed to a temperature history θ(t) can be expressed by an equivalent age (te) determined at fixed reference temperature (θr): Fc (θr, tr) = K (θ (t) , t). Equivalent age concept was applied to calculate the strength development of sand concrete compared to ordinary concrete, with different curing temperature, 35, 55, and 70∘C. Sand concrete is used in case of penury of coarse aggregate or, when sand is in extra quantity
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