Abstract
Incorporation of bacteria can realize self-healing and enhance strength of concrete, which has been drawn extensive attention in past decades. The studies focused on the properties of fiber reinforced concrete with bacterial addition are still very limited. In this paper, mechanical performance of strain hardening cementitious composites (SHCC) with directly adding vegetative bacterial cells was investigated. The experimental results revealed that the compressive, first cracking, and tensile strength of SHCCs was increased due to the addition of bacteria, while the tensile strain capacity tended to decline. At micro-scale level, the matrix containing bacteria has relative higher fracture toughness to that of reference mix. Interestingly, the bacteria notably lowered chemical bond between PVA fiber and its surrounding hydrates; on the other hand, the frictional bond was enhanced. The findings in this study can provide a reference for modifying the surface of hydrophilic fibers.
Highlights
Concrete is the second most consumed substance in the world only after water, duo to its high strength, low cost, and easy availability worldwide et al It contributes greatly to the infrastructures, and is the foundation of modern development, providing a solid and safe structure for the daily life of people
The results showed that the addition of bacteria could reduce the concrete penetrability because of the calcite sediments [20], the interfacial bond between fiber and cement matrix can be enhanced [21], and subsequently improved the flexural and split tensile strength of fiber reinforced concrete (FRC) [19, 22]
It is noted that the harden time of W-strain hardening cementitious composites (SHCC) and M-SHCC was delayed significantly due to the nutrient substances in bacterial culture, which was reflected that the specimens of W-SHCC and M-SHCC can’t be demolded until 3 curing days while that of Ref.-SHCC was demolded at 1 curing day
Summary
Concrete is the second most consumed substance in the world only after water, duo to its high strength, low cost, and easy availability worldwide et al It contributes greatly to the infrastructures, and is the foundation of modern development, providing a solid and safe structure for the daily life of people. The results showed that the addition of bacteria could reduce the concrete penetrability because of the calcite sediments [20], the interfacial bond between fiber and cement matrix can be enhanced [21], and subsequently improved the flexural and split tensile strength of FRC [19, 22]. The authors found that the bacterial incorporation promoted the multiple cracking phenomena in SHCC with high-volume fly ash, and showed a comparable strain capacity to that of control SHCC mixture [23].
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