Abstract
An experimental company was carried out to better understand the influence of curing temperature on the mechanical behaviour of cementitious materials, particularly compressive strength, the study focused on two types of mortars, the first containing polypropylene fibers while the second contains a proportion of PVC-type plastic grains from industrial waste, the hydration kinetics of the different components of the formulated mortar has been characterized by the isothermal calorimetric test, thus a history of the hydration degrees has been established, Afterwards, an attempt was made to correlate the compressive strength with the evolution of the degree of hydration for the different formulations, based on the results obtained, it is clearly observable that the compressive strength evolves with the degree of hydration and that the specimen containing the polypropylene fibers has the best mechanical performance with respect to compression.
Highlights
The degree of hydration is significantly independent of the curing temperature the increase in cure temperature causes a slight increase in absorbed sulphate and incorporated aluminium the polymerization of C-S-H increases with temperature the problem posed in this current research work is that we have other elements that are added in the reaction between cement and water, namely PVC-type plastic interposing through (C2H3Cl)n and polypropylene fibres embodying through (C3H6)n which have been used as substituents[14,15]
In this paper we will compare the evolution of hydration degree for different curing temperatures and for several mortars, among them those containing plastic additives and fibres and we will compare the results found with those of the reference mortar
We note from the results of the experimental company that the behaviour of concrete regarding the thermal effect remains relatively complicated, we note that the evolution of the degree of hydration registers a significant increase with the curing temperature for the different mortars formulated
Summary
The mechanical performance of structures based on cementitious materials is influenced by microstructural temperature and water behaviour[1], the departure of water during drying[2], understanding the behaviour of cementitious materials with regard to the thermal effect remains relatively complex, recent research works has shown that a high temperature at the fresh state has a negative impact on the final compressive strength of concrete, but a rise in the cured state has a positive effect[3,4,5,6,7]. The description of the thermal effect on the structural behaviour of concrete necessarily leads us to a thorough understanding of the hydration kinetics of cement and the reaction that governs this phenomenon and which is obviously C3A+C3S C-S-H+ettringities [8,9]. This reaction begins at the beginning of contact between cement and water, as C3S interacts with C3A and forms C-S-H and ettringites, previous studies have shown that this reaction is exothermic and thermoactivated [10,11], during concrete pouring, the heat released by this exothermic character causes thermodynamic effects whose damages are no longer negligible, especially when we talk about massive structures such as dams and road works or structures in aggressive environments such as port dams or reservoirs. In this paper we will compare the evolution of hydration degree for different curing temperatures and for several mortars, among them those containing plastic additives and fibres and we will compare the results found with those of the reference mortar
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