Abstract
The performance of cover concrete is acknowledged as a major factor governing the degradation of concrete structures. Curing plays a vital role in the development of concrete durability. 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. 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 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. 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 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. 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 results provide a theoretical basis for the fine control of a concrete curing system.
Highlights
With the continuous development of modern construction technology, the design strength grade of concrete is constantly improving, especially in terms of the early increase in strength grade [1]
With the cement hydration and the secondary hydration of mineral admixtures, the water on the concrete surface will constantly move inward, resulting in the loss of the surface water too rapidly, which if serious will lead to surface quality problems of concrete, such as low hydration degree, increased shrinkage and even cracking [7]
The test results obtained by Chrisp et al [12,13,14] show that the quality of the concrete surface layer is affected by mix ratio, material properties, molding, vibration and curing conditions, among which curing has the greatest influence on the performance of concrete surface layer
Summary
With the continuous development of modern construction technology, the design strength grade of concrete is constantly improving, especially in terms of the early increase in strength grade [1]. With the cement hydration and the secondary hydration of mineral admixtures, the water on the concrete surface will constantly move inward, resulting in the loss of the surface water too rapidly, which if serious will lead to surface quality problems of concrete, such as low hydration degree, increased shrinkage and even cracking [7]. The test results obtained by Chrisp et al [12,13,14] show that the quality of the concrete surface layer is affected by mix ratio, material properties, molding, vibration and curing conditions, among which curing has the greatest influence on the performance of concrete surface layer. Lura et al [15,16]
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