Mechanical properties of nano-SiO2 reinforced engineered cementitious composites after exposure to high temperatures

Zhang, Peng; Han, Qiaoyi; Wu, Jingjiang; Zhang, Yong; Zhang, Tianhang

doi:10.1016/j.conbuildmat.2022.129123

Cited by 25 publications

(10 citation statements)

References 60 publications

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“…Evaporating water causes shrinkage in UHPGPC mixtures. The shrinkage caused by the loss of water and the vapor pressure formed in the UHPGPC mixtures causes the evaluation of micro and macro cracks in the interior complex of the specimens 56–59 . While the reduction in RCS values of the M0 control sample after 300°C is 10.67%, the decline in RCS of single M1–M4 ST and BA fiber‐reinforced UHPGPC samples is between 6.43% and 9.01%.…”

Section: Resultsmentioning

confidence: 99%

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%

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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“…The mass loss rate is small and lower than 5%, and the growth rate is relatively gradual. When the temperature increases from 200 °C to 400 °C, large amounts of free water and chemical crystal water evaporate or decompose [ 36 ]. At this stage, the mass loss rate of specimens increases significantly, and the rate of change accelerates.…”

Section: Resultsmentioning

confidence: 99%

Mechanical Properties of Polyvinyl Alcohol Fiber-Reinforced Cementitious Composites after High-Temperature Exposure

Zhang

et al. 2022

Gels

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The mechanical properties of cementitious composites before and after exposure to high temperature are affected by calcium–silicate–hydrate (C–S–H) gels. To evaluate the effects of high temperature, plyvinyl alcohol (PVA) fiber content, and the cooling method on properties of cementitious composites, physical, mechanical, and microscopic tests were performed in this study. The target temperatures were 25, 100, 200, 300, 400, 600, and 800 °C. The PVA fiber contents were 0.0, 0.3, 0.6, 0.9, 1.2, and 1.5 vol%. The high-temperature resistance of PVA fiber-reinforced cementitious composite (PVA-FRCC) specimens was investigated through changes in their appearance, mass loss, compressive strength, splitting tensile strength, flexural strength, and microstructure. The results showed that PVA fibers reduced the probability of explosion spalling in the PVA-FRCC specimens exposed to high temperatures. The mass loss rate of samples exposed to temperatures below 200 °C was small and lower than 5%, whereas a significant mass loss was observed at 200 °C to 800 °C. A small rise in the cubic compressive and splitting tensile strengths of samples was found at 400 °C and 300 °C, respectively. Below 400 °C, the fibers were beneficial to the mechanical strength of the PVA-FRCC specimens. Nevertheless, when the temperature was heated above 400 °C, melted fibers created many pores and channels, which caused a decrease in the strength of the specimens. The method of cooling with water could aggravate the damage to the cementitious composites exposed to temperatures above 200 °C. High temperature could lead to the decomposition of the C–S–H gels of the PVA-FRCC samples, which makes C–S–H gels lose their bonding ability. From the perspective of the microstructure, the structure of PVA-FRCC samples exposed to 600 °C and 800 °C became loose and the number of microcracks increased, which confirmed the reduction in macro-mechanical properties.

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“…This observation indicates the paddy straw fiber-reinforced particle board can be considered as a cost competitive material for thermal insulation application. As the thermal conductivity of sample wall panel boards developed in the present work is within the acceptable limit, these boards can be considered as possible and promising thermal insulation materials [70,71].…”

Section: Thermal Propertiesmentioning

confidence: 97%

Impact of Eggshell Powder on the Mechanical and Thermal Properties of Lightweight Geopolymer

Rathinavel,

Kannadasan,

Mohamed Ismail

et al. 2023

Advances in Civil Engineering

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Adopting proper waste management technology in the place of the construction industry to the extent possible to lower the production of new materials and intern reduces the environmental impact pertaining to the industry. In this work, eggshell powder (ESP; waste from the poultry industry) and fly ash (FA; waste from combustion of coal) were utilized as precursors for producing geopolymer and to substitute conventional cement-based construction materials. Three different weight percentage ratios of precursors, namely, 90FA:10ESP, 80FA:20ESP, and 70FA:30ESP were reinforced with two different weight percentages, namely, 15 and 30 wt% of paddy straw in the presence of suitable combinations of sodium silicate and sodium hydroxide to obtain lightweight geopolymer panels. Results received from different analytical tests, namely, density, water absorption, compressive strength, and flexural strength infer that the incorporation of ESP enhances the performance of the geopolymer products to a considerable extent. The specimen sample made using 70FA:30ESP in the absence of paddy straw reinforcement possesses a compressive strength value of 15.64 MPa, which is higher than that of paddy straw reinforced panels. It was observed that there was a reverse trend noticed in the case of flexural behavior on reinforcement of paddy straw, namely, 15 wt% possesses a higher value than that of the panel (70FA:30ESP) made using in the absence of reinforcement. The lowest thermal conductivity value was observed at 0.0633 W/m·K for the sample 90FA:10ESP reinforced with 30% paddy straw. Data from different studies infer that using ESP and paddy straw reinforcement influences strength properties and thermal conductivity. The present study indicates valid information related to the using biowastes for the production of insulation materials and environmental preservation and energy conservation.

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Mechanical properties of nano-SiO2 reinforced engineered cementitious composites after exposure to high temperatures

Cited by 25 publications

References 60 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

Mechanical Properties of Polyvinyl Alcohol Fiber-Reinforced Cementitious Composites after High-Temperature Exposure

Impact of Eggshell Powder on the Mechanical and Thermal Properties of Lightweight Geopolymer

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