A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Hydrothermal synthesis of sodium silicate from rice husk ash: Effect of synthesis on silicate structure and transport properties of alkali-activated concrete
Abstract Alkali-activated materials (AAMs) are increasingly being researched to reduce the reliance on conventional cements as building materials. However, expensive and energy-intensive alkaline activators curtail the usage of AAMs. Waste-derived alkaline activators are effective in mitigating the environmental concerns for alkaline activators, but their synthesis process and the transport properties of AAM concrete are yet to be fully understood. This paper presents comprehensive results of syntheses of alternative sodium silicates (SSs) from rice husk ash (RHA) using a hydrothermal process. The effect of mixing duration, temperature, and RHA/NaOH ratio on the availability and structure of silicate species in the extracted RHA SSs were investigated. Compressive strength, water absorption, sorptivity, and chloride resistance tests were carried out to assess the performance of RHA SS in AAM concrete. The results showed that all RHA SSs contain monomer, dimer, trimer, and tetramer silicate oligomers but their respective proportion primarily depends on the temperature and RHA/NaOH ratio. The recommended hydrothermal process in this study was 1 h of mixing at 80 °C. The 28-day compressive strength of AAM concrete made of RHA SS was only up to 5 % lower than the one made of commercial SS. In addition, the transport properties of AAM concrete made of RHA and commercial SSs were comparable, proving the feasibility of RHA-derived activators (filtered and unfiltered).
Hydrothermal synthesis of sodium silicate from rice husk ash: Effect of synthesis on silicate structure and transport properties of alkali-activated concrete
Abstract Alkali-activated materials (AAMs) are increasingly being researched to reduce the reliance on conventional cements as building materials. However, expensive and energy-intensive alkaline activators curtail the usage of AAMs. Waste-derived alkaline activators are effective in mitigating the environmental concerns for alkaline activators, but their synthesis process and the transport properties of AAM concrete are yet to be fully understood. This paper presents comprehensive results of syntheses of alternative sodium silicates (SSs) from rice husk ash (RHA) using a hydrothermal process. The effect of mixing duration, temperature, and RHA/NaOH ratio on the availability and structure of silicate species in the extracted RHA SSs were investigated. Compressive strength, water absorption, sorptivity, and chloride resistance tests were carried out to assess the performance of RHA SS in AAM concrete. The results showed that all RHA SSs contain monomer, dimer, trimer, and tetramer silicate oligomers but their respective proportion primarily depends on the temperature and RHA/NaOH ratio. The recommended hydrothermal process in this study was 1 h of mixing at 80 °C. The 28-day compressive strength of AAM concrete made of RHA SS was only up to 5 % lower than the one made of commercial SS. In addition, the transport properties of AAM concrete made of RHA and commercial SSs were comparable, proving the feasibility of RHA-derived activators (filtered and unfiltered).
Hydrothermal synthesis of sodium silicate from rice husk ash: Effect of synthesis on silicate structure and transport properties of alkali-activated concrete
Alnahhal, Mohammed Fouad (author) / Hamdan, Abdelrahman (author) / Hajimohammadi, Ailar (author) / Castel, Arnaud (author) / Kim, Taehwan (author)
2024-02-12
Article (Journal)
Electronic Resource
English
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