Abstract
Strain hardening cementitious composites (SHCCs) with superior tensile strength and ductility have been utilized as an effective repair material. A corrosion-resistant binder, calcium aluminate cement (CAC)–ground granulated blast-furnace slag (GGBFS) blends, has been introduced into SHCC to expand its application in the concrete sewage network rehabilitation. As a repair material, the lightweight property is particularly favorable as it can broaden its functionality. This article presents a study on developing a novel lightweight CAC-GGBFS-blended SHCC using hollow glass microsphere (HGM), namely, HGMLW-SHCCs. The fine silica sand content was substituted with HGM at 25, 50, 75, and 100 vol% in HGMLW-SHCC. We examined flowability, density, uniaxial compressive behavior, direct tensile behavior, and pseudo strain-hardening indices. Microstructure analysis was also conducted to understand the meso-scale behavior of this new lightweight composite. The newly developed HGMLW-SHCC had a 28-day density of only 1756 kg/m3. Compressive and tensile strengths were determined in the range of 62.80–49.39 MPa and 5.81–4.19 MPa, respectively. All mixtures exhibited significant strain-hardening behavior. Even though the increased HGM content negatively affected the tensile strength of HGMLW-SHCC, it had a positive effect on its ductility. In addition, HGM can reduce crack width and tensile stress fluctuations significantly. The results showed that HGM was a promising material for producing strong and lightweight corrosion-resistant SHCCs to be used as a retrofitting material in the wastewater industry.
Highlights
Concrete sewerage pipe has been used extensively ascribed to its high strength, versatility, and cost efficiency (Song et al, 2021)
Calcium aluminate cement (CAC)-based mortar lining has been adopted for sewerage pipe rehabilitation Two decades ago (El-Hemaly et al, 2008), the brittleness nature of the mortar material is prone to crack under tension load, when repairing the pipe crown and invert
To improve the durability and mechanical properties of the CAC mortar lining material, the authors have taken a pilot step to tailor this material into a high performance fiber-reinforced cementitious material, namely, PE fiber-reinforced CAC-ground granulated blastfurnace slag (GGBFS)-blended strain hardening cementitious composite (SHCC) (Fan et al, 2020; Fan et al, 2020)
Summary
Concrete sewerage pipe has been used extensively ascribed to its high strength, versatility, and cost efficiency (Song et al, 2021). To improve the durability and mechanical properties of the CAC mortar lining material, the authors have taken a pilot step to tailor this material into a high performance fiber-reinforced cementitious material, namely, PE fiber-reinforced CAC-ground granulated blastfurnace slag (GGBFS)-blended strain hardening cementitious composite (SHCC) (Fan et al, 2020; Fan et al, 2020). This newly developed cementitious composite can achieve 5% tensile strain capacity with only 1% PE fiber reinforcement, with an excellent strain-hardening behavior under tension. The lightweight property is greatly preferred and favored, and efforts must be made to further develop the PE fiber-reinforced CAC-GGBFS-blended SHCC with the lightweight characteristic
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