Experimental Investigation of Material Properties and Self-Healing Ability in a Blended Cement Mortar with Blast Furnace Slag

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.

Enhancing Freeze–Thaw Resistance of Alkali-Activated Slag by Metakaolin

“… 22 Its compressive strength is much higher than that of cement mortar containing diatomite (<60 MPa) 27 and cement mortar (blended with BFS) with a compressive strength of 72.8 MPa. 28 The strength loss of the specimens without MK was closer to the rating index of 15% for F–T loss. The lowest was 3.3% at 20 wt % MK, and the rate of strength loss increased when the dosing amount was too high.…”

“…The possible reason is that the substitution of BFS by MK leads to a decrease in the solubility of Ca . Its compressive strength is much higher than that of cement mortar containing diatomite (<60 MPa) and cement mortar (blended with BFS) with a compressive strength of 72.8 MPa . The strength loss of the specimens without MK was closer to the rating index of 15% for F–T loss.…”

“…The main bands of samples M2, M3, E3, and T3 were narrowed. This is likely caused by the continuous increase of silicates or substitution of tetrahedral Al in the gel structure. , The gray dotted lines labeled non-dominant peaks in the figure at about 450, 710, 1430, and 1650 cm –1 correspond to O–Si–O bond bending vibrations, Si–O–Al bond bending vibrations, C–O bond stretching vibrations in CO, − and O–H bending vibrations in calcium silica–aluminate hydrate, respectively.…”

Smart Self-Healing Capability of Asphalt Material Using Bionic Microvascular Containing Oily Rejuvenator

“…(a) (b) (c) When the rejuvenator molecules diffuse into asphalt, the movement ability of bituminous molecules is also greatly enhanced at the same time [21]. Through entanglement and collusion of molecular segments, bituminous molecules can make cracks disappear quickly [37].…”

“…Su et al [20] studied and improved a 3PB test system to evaluate asphalt mixtures containing microcapsules with rejuvenator. Researchers [21] also used the above system to evaluate the self-healing effect of mortar mixtures. It is disappointing that the 3PB experiment can only provide relatively macroscopic evidence for self-healing efficiency.…”