Abstract
In this study, we investigated the effects of mineral admixtures on the autogenous healing of flexural mortar members through a chloride ion penetration test. The mineral admixtures used were ground granulated blast-furnace slag (GGBS), fly ash, silica fume (SF), clinker binder, and clinker sand. Through a four-point bending test, a crack of approximately 100 μm was induced at the bottom of the flexural mortar member, and the chloride ion penetration depth through the crack was measured to evaluate the self-healing performance. Additionally, we analyzed the correlation between the self-healing performances, which was measured through water flow and water absorption tests. The experimental results showed that the chloride ion penetration depth decreased due to crack healing, and the self-healing performance of the GGBS and SF was the highest. It was found that the subtle change in the self-healing performance was more accurately evaluated by the chloride ion penetration test.
Highlights
The strengths of Plain, S30, and S60 decreased as the mixing ratio of ground granulated blast-furnace slag (GGBS) increased
Compared with Plain, the compressive strengths of SF10 and CKB10 that used a clinker binder increased; there was no significant difference between the strengths of Plain and CKB10
The initial and secondary slopes are parameters influenced by the microstructure of cementitious materials
Summary
OPC, GGBS, FA, SF, and clinker binder were used as binders Their respective densities were 3.14 g/cm3 , 2.9 g/cm3 , 2.15 g/cm3 , 2.35 g/cm , and 3.16 g/cm. CKB and CKS represent illustrates the particle size distribution of the clinker binder and clinker sand. The clinker sand was replace the fine aggregates when making the mortar specimens. The average particle sizes manufactured to replace the fine aggregates when making the mortar specimens. Fine aggregates and a chemical admixture were added and mixed for 2 min, and min, and PVA fibers were slowly added and mixed for 1 min when an appropriate flow.
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