Developing High-Strength Geopolymer using Least Activator and Pressure-Applied Casting: Techno-Enviro-Economic Performance

IF 1.6 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY
Khuram Rashid, Fahad Masud
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引用次数: 0

Abstract

This work is designed by coupling fly ash (FA) with dune sand (DS) for high-strength geopolymer activated in an alkaline environment under pressure-applied casting. Initially, the proportion of FA and DS is optimized with the least activator dosage to obtain higher than the compressive strength of 50 MPa. A uniaxial pressure is applied on a semi-dry mixture containing the least activators and immediately demolded, involving rapid production for the industrialization purpose of the paving blocks. The experimental study revealed that the FA-DS proportion of 1:1, with a liquid-to-solid ratio of 0.16, achieved a compressive strength of 54.4 MPa. Consequently, the coupling of DS provides an occupying effect and reduces the required activator quantity. The strength gain mechanism is discussed at the molecular level by analyzing Fourier-transform infrared. Finally, the technical performance of the strength and the density is evaluated on the real size 203 × 101 × 80 mm prism and compared with the commercially available conventional concrete blocks. Besides, the enviro-economic performance in terms of CO2 emissions and the cost are analysed as well. It is concluded that the developed block is a more environmentally sustainable and economically viable alternative to conventional concrete blocks.

利用最少活化剂和压力浇注法开发高强度土工聚合物:技术-环境-经济性能
这项工作旨在将粉煤灰(FA)与沙丘砂(DS)结合起来,在碱性环境中通过加压浇注活化高强度土工聚合物。最初,以最少的活化剂用量优化粉煤灰和沙丘砂的比例,以获得高于 50 兆帕的抗压强度。在含有最少活化剂的半干混合物上施加单轴压力,然后立即脱模,实现铺路砖工业化的快速生产。实验研究表明,FA-DS 的比例为 1:1,液固比为 0.16,抗压强度达到 54.4 兆帕。因此,DS 的耦合提供了占位效应,减少了所需的活化剂数量。通过分析傅立叶变换红外线,从分子层面探讨了强度增加的机理。最后,在实际尺寸为 203 × 101 × 80 毫米的棱柱上对强度和密度的技术性能进行了评估,并与市售的传统混凝土砌块进行了比较。此外,还分析了二氧化碳排放量和成本方面的环境经济性能。结论是,与传统混凝土砌块相比,所开发的砌块在环境上更具可持续性,在经济上也更加可行。
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来源期刊
Journal of Advanced Concrete Technology
Journal of Advanced Concrete Technology 工程技术-材料科学:综合
CiteScore
3.70
自引率
10.00%
发文量
45
审稿时长
3.5 months
期刊介绍: JACT is fast. Only 5 to 7 months from submission to publishing thanks to electronic file exchange between you, the reviewers and the editors. JACT is high quality. Peer-reviewed by internationally renowned experts who return review comments to ensure the highest possible quality. JACT is transparent. The status of your manuscript from submission to publishing can be viewed on our website, greatly reducing the frustration of being kept in the dark, possibly for over a year in the case of some journals. JACT is cost-effective. Submission and subscription are free of charge . Full-text PDF files are available for the authors to open at their web sites. Scope: *Materials: -Material properties -Fresh concrete -Hardened concrete -High performance concrete -Development of new materials -Fiber reinforcement *Maintenance and Rehabilitation: -Durability and repair -Strengthening/Rehabilitation -LCC for concrete structures -Environmant conscious materials *Structures: -Design and construction of RC and PC Structures -Seismic design -Safety against environmental disasters -Failure mechanism and non-linear analysis/modeling -Composite and mixed structures *Other: -Monitoring -Aesthetics of concrete structures -Other concrete related topics
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