Abstract
This paper presents the results of an experimental investigation on the material properties and self-healing ability of a blended cement mortar incorporating blast furnace slag (BFS). The effect of different types and Blaine fineness of BFS on the material properties and self-healing was investigated. Thirteen cement mixtures with BFS of different types and degrees of Blaine fineness are tested to evaluate the mechanical properties, namely compressive strength, bending strength, freeze–thaw, and accelerated carbonation. The pore structure is examined by means of mercury intrusion porosimetry. Seven blended mortar mixtures incorporating BFS for cement are used to evaluate the mechanical properties after applying freeze–thaw cycles until the relative dynamic modulus of elasticity reached 60%. The experimental results reveal that incorporating BFS improves the mechanical properties and self-healing ability. In the investigation of self-healing, smaller particle and high replacement ratios of BFS contribute to increasing the relative dynamic modulus of elasticity and decreasing the carbonation coefficient in the mortar after re-water curing. Moreover, BFS’s larger particles and high replacement ratio are found to provide better self-healing ability. A regression equation is created to predict the relative dynamic modulus of elasticity in mortar considering the Blaine fineness, BFS replacement ratio, and curing conditions.
Highlights
Concrete has been widely used for a long time in the civil engineering and construction fields, and it has many benefits, such as high durability, low cost, and high compressive strength
The decreasing performance due to micro cracks generated by freeze–thaw cycles reduces the lifetime of the concrete structure
The blast furnace slag (BFS) replacement ratios were set at 45 wt % and 70 wt % for cement, and 20 wt % and 45 wt % for sand in the mortar
Summary
Concrete has been widely used for a long time in the civil engineering and construction fields, and it has many benefits, such as high durability, low cost, and high compressive strength. The researchers have studied the self-healing ability of cement-based materials that are damaged by freeze–thaw. Incorporating fly ash in the mortar was reported to lead to an increase in the relative dynamic modulus of elasticity and a decrease in the carbonation coefficient, and it was reported that cracks occurring after frost damage are filled by hydration products of the fly ash [12]. The purpose of this study is to investigate the material properties and self-healing ability of blended cement mortar incorporating BFS of different types and degrees of Blaine fineness. A regression equation was created to predict the relative dynamic modulus of elasticity in mortar considering the Blaine fineness, BFS replacement ratio, and curing conditions
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