10/29/2022 0 Comments Bs en 12390 1![]() ![]() ![]() To mitigate this impact, the components of waste tires can be used in the production of green concrete. The safe disposal of waste tires has been seen as having a negative impact on the environment. The results provide a theoretical basis for the fine control of a concrete curing system. Moreover, there is a strong correlation between the cumulative curing water demand and the chemically bound water content, indicating that the power of water migration mainly comes from the hydration activity of the cementing material system. The curing water demand of cover concrete decreases with the increase of mineral admixture content, and the curing water demand of pure water is the maximum and that of mix FA and GGBS is the minimum. Due to the filling effect and active effect, the addition of fly ash (FA) and ground granulated blast slag (GGBS) reduces the curing water demand. The results show that the addition of mineral admixtures can reduce the early hydration rate and hydration exothermic characteristics, and the hydration degree decreases with the increase of mineral admixtures. Combined with the characteristics of the hydration heat and chemically bound water of the composition cementing material system, the law of variation for curing water demand was analyzed. The effects of different water-binder ratios and mineral admixtures on the curing water demand of concrete were studied by the surface water absorption test. Curing plays a vital role in the development of concrete durability. The performance of cover concrete is acknowledged as a major factor governing the degradation of concrete structures. It was found that the presence of admixtures had a greater impact on the quantitative composition of the cement paste in the case of samples made with CEM I. The quantitative composition of hardened cement paste depends mainly on the kind of cement used. In general, the same kinds of hydration products were identified in all the hardened samples after long time of hydration. The rate of heat release during hydration and the related parameters depend primarily on the type of cement, and in the case of admixtures, the use of plasticiser has a much greater effect than VMA. The effect of VMA application on concrete permeability is negative in most cases and is most evident in the specimens tested after drying at 65 VMA admixture did not significantly affect the sorptivity of the CEM I series, while in the case of the CEM III series, the sorptivity increased with increasing admixture dosage. Used admixtures decreases 28 day compressive strength and the reduction depends on the kind of cement and curing conditions. The main goal of this research was to determine the effect of viscosity modifying agent admixture and specimen curing conditions on air permeability, sorptivity and mechanical properties of concrete and determining the effect of the admixture on the intensity of early cement hydration and the phase composition of the hardened cement paste. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |