Multi-scale effects of tensile properties of lightweight engineered geopolymer composites reinforced with MWCNTs and steel-PVA hybrid fibers

Cheng, Zhijun; Liu, Zhenzhen; Hao, Huali; Lu, Yiyan; Li, Shan

doi:10.1016/j.conbuildmat.2022.128090

Cited by 19 publications

(5 citation statements)

References 45 publications

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“…Six‐millimeter‐thick micro‐BA fibers more effectively limited the formation and uncontrolled propagation of micro‐cracks in the matrix compared to 12‐ and 13‐mm‐length BA and ST fibers. Therefore, it was more beneficial to use micro‐BA fibers as hybrid forms with BA and ST fibers with 12‐ and 13‐mm lengths to improve the RCS capacities of mortar samples exposed to high‐temperature effects 64–68 …”

Section: Resultsmentioning

confidence: 99%

“…Therefore, it was more beneficial to use micro-BA fibers as hybrid forms with BA and ST fibers with 12-and 13-mm lengths to improve the RCS capacities of mortar samples exposed to hightemperature effects. [64][65][66][67][68] Additionally, ST fibers appear to have slightly higher RCS values in both single (M1-M2) and hybrid uses (M5-M6) compared to single (M3-M4) and hybrid (M7-…”

Section: F I G U Ementioning

confidence: 95%

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The single and hybrid use of steel and basalt fibers on high‐temperature resistance of sustainable ultra‐high performance geopolymer cement mortars

Güler

Akbulut

2023

Structural Concrete

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This paper primarily examines the flowability, physical appearance, mass loss, residual compressive strength (RCS), and residual flexural strength (RFS) properties of steel (ST) and basalt (BA) fiber-added sustainable ultra-high performance geopolymer cement (UHPGPC) mortars exposed to hightemperature effects. According to the results obtained, ST and BA fibers adversely influence the workability properties of UHPGPC mortars and thus significantly reduce the spreading diameters of the mortars. However, ST and BA fibers substantially improve the RCS and RFS capacities of UHPGPC specimens exposed to high temperatures because they have a powerful bonding effect with the matrix and effectually restrict the development of micro-and macro-cracks with their bridging effect. Furthermore, this phenomenon is slightly more effective in hybrid form than using ST and BA fibers.

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Section: Resultsmentioning

confidence: 99%

Section: F I G U Ementioning

confidence: 95%

The single and hybrid use of steel and basalt fibers on high‐temperature resistance of sustainable ultra‐high performance geopolymer cement mortars

Güler

Akbulut

2023

Structural Concrete

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“…From Figure 4 , ECC showed obvious strain hardening characteristics after cracking, the ultimate strain (the corresponding strain when the stress drops to 85% of the peak stress) reached 3.12%, and the peak tensile stress reached 4.25 MPa. In addition, the curve fluctuated obviously, and each fluctuation indicates a new crack appeared in the specimen [ 39 ]. Nickel–titanium superelastic SMA fibers were used in this test, with diameters of 1.0 mm, 1.2 mm, and 1.5 mm, respectively.…”

Section: Experiments Designmentioning

confidence: 99%

Bonding Mechanical Properties between SMA Fiber and ECC Matrix under Direct Pullout Loads

Yang

Gong

et al. 2023

Materials

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SMAF-ECC material composed of shape memory alloy fiber (SMAF) and engineered cementitious composite (ECC) has good bending and tensile properties, as well as good crack self-healing ability, energy consumption, and self-centering ability. The bond behavior between fiber and matrix is crucial to the effective utilization of the superelasticity of SMAF. The experimental study considered three variables: SMA fiber diameter, fiber end shape, and bond length. The pullout stress–strain curve of SMAF was obtained, and the maximum pullout stress, maximum bond stress, and fiber utilization rate were analyzed. Compared with the straight end and the hook end, the maximum pullout stress of the specimen using the knotted end SMAF is above 900 MPa, the fiber undergoes martensitic transformation, and the fiber utilization rate is above 80%, indicating that the setting of the knotted end can give full play to the superelasticity of the SMAF. Within the effective bond length range, increasing the bond length can increase the maximum anchorage force of the knotted end SMAF. Increasing the fiber diameter can increase the maximum pullout stress and maximum anchoring force of the knotted end SMAF but reduce the utilization rate of SMA fiber. This study provides a reliable theoretical basis for the bonding properties between SMAF and ECC.

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“…The sample without rGFRP fiber and with 15% foaming agent achieved the highest drying shrinkage rate of 0.46%, while the smallest drying shrinkage rate of 0.10% was obtained by the sample with 20% foaming agent and 6% rGFRP fiber. The possible reason is that the interlocking and bridging effect between the fiber and the matrix might inhibit the shrinkage of the geopolymer [56].…”

Section: Drying Shrinkagementioning

confidence: 99%

“…The possible reason is that the interlocking and bridging effect between the fiber and the matrix might inhibit the shrinkage of the geopolymer [56].…”

Section: Drying Shrinkagementioning

confidence: 99%

Mechanical and Thermal Insulation Properties of rGFRP Fiber-Reinforced Lightweight Fly-Ash-Slag-Based Geopolymer Mortar

Zhang

Qiu

et al. 2023

Sustainability

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As a lightweight cementitious material for thermal insulation, the mechanical performance of foamed geopolymer is always compromised by its density reduction. In this study, recycled-glass-fiber-reinforced plastic (rGFRP) fiber was used to reinforce the fly ash-slag based foamed geopolymer, and vitrified micro bubbles (VMB) were applied to further decrease the thermal conductivity and modify the resistance of the lightweight mortar against drying shrinkage. The results revealed that the density, compressive strength, and thermal conductivity of the foamed geopolymer with/without VMB decreased with the increase in foaming agent content. By adding 2~6% of rGFRP fiber, the compressive strength was increased by 25~165%, and the drying shrinkage was reduced the most, by 55%. After the addition of 10% of VMB, the density, thermal conductivity, and drying shrinkage of foamed geopolymer mortar were further decreased, with the highest reductions of 8%, 26%, and 64%, respectively, due to the reduced pore volume and increase proportion of closed pores. With 6% of rGFRP fiber and 25% of foaming agent, the lightweight geopolymer mortar had the optimum performance, with compressive strength of 1.343 MPa, thermal conductivity of 0.134 W/(m·K), and drying shrinkage of 0.095%. This study developed a sustainable lightweight mortar with multiple types of industrial by-products, which benefit both the development of thermal insulation materials and reuse of solid wastes.

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Multi-scale effects of tensile properties of lightweight engineered geopolymer composites reinforced with MWCNTs and steel-PVA hybrid fibers

Cited by 19 publications

References 45 publications

The single and hybrid use of steel and basalt fibers on high‐temperature resistance of sustainable ultra‐high performance geopolymer cement mortars

The single and hybrid use of steel and basalt fibers on high‐temperature resistance of sustainable ultra‐high performance geopolymer cement mortars

Bonding Mechanical Properties between SMA Fiber and ECC Matrix under Direct Pullout Loads

Mechanical and Thermal Insulation Properties of rGFRP Fiber-Reinforced Lightweight Fly-Ash-Slag-Based Geopolymer Mortar

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