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碱激发粉煤灰在水下浇筑时的性能

Behavior of Alkali-Activated Fly Ash through Underwater Placement.

作者信息

Yahya Zarina, Abdullah Mohd Mustafa Al Bakri, Li Long-Yuan, Burduhos Nergis Dumitru Doru, Hakimi Muhammad Aiman Asyraf Zainal, Sandu Andrei Victor, Vizureanu Petrica, Razak Rafiza Abd

机构信息

Centre of Excellence Geopolymer and Green Technology (CEGeoGTech), Universiti Malaysia Perlis (UniMAP), Perlis 01000, Malaysia.

Faculty of Civil Engineering Technology, Universiti Malaysia Perlis (UniMAP), Perlis 01000, Malaysia.

出版信息

Materials (Basel). 2021 Nov 14;14(22):6865. doi: 10.3390/ma14226865.

DOI:10.3390/ma14226865
PMID:34832267
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8622101/
Abstract

Underwater concrete is a cohesive self-consolidated concrete used for concreting underwater structures such as bridge piers. Conventional concrete used anti-washout admixture (AWA) to form a high-viscosity underwater concrete to minimise the dispersion of concrete material into the surrounding water. The reduction of quality for conventional concrete is mainly due to the washing out of cement and fine particles upon casting in the water. This research focused on the detailed investigations into the setting time, washout effect, compressive strength, and chemical composition analysis of alkali-activated fly ash (AAFA) paste through underwater placement in seawater and freshwater. Class C fly ash as source materials, sodium silicate, and sodium hydroxide solution as alkaline activator were used for this study. Specimens produced through underwater placement in seawater showed impressive performance with strength 71.10 MPa on 28 days. According to the Standard of the Japan Society of Civil Engineers (JSCE), the strength of specimens for underwater placement must not be lower than 80% of the specimen's strength prepared in dry conditions. As result, the AAFA specimens only showed 12.11% reduction in strength compared to the specimen prepared in dry conditions, thus proving that AAFA paste has high potential to be applied in seawater and freshwater applications.

摘要

水下混凝土是一种具有粘性的自密实混凝土，用于浇筑水下结构，如桥墩。传统混凝土使用抗冲刷外加剂（AWA）来形成高粘度的水下混凝土，以尽量减少混凝土材料分散到周围水中。传统混凝土质量下降主要是由于在水中浇筑时水泥和细颗粒被冲走。本研究着重对碱激活粉煤灰（AAFA）浆体在海水和淡水中水下浇筑后的凝结时间、冲刷效果、抗压强度和化学成分分析进行详细研究。本研究使用C类粉煤灰作为原料，硅酸钠和氢氧化钠溶液作为碱性激发剂。在海水中水下浇筑制成的试件在28天时表现出令人印象深刻的性能，强度达到71.10MPa。根据日本土木工程师协会（JSCE）的标准，水下浇筑试件的强度不得低于在干燥条件下制备的试件强度的80%。结果，与在干燥条件下制备的试件相比，AAFA试件的强度仅降低了12.11%，从而证明AAFA浆体在海水和淡水应用中具有很高的应用潜力。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8dfb/8622101/ecdf1de7604c/materials-14-06865-g009a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8dfb/8622101/cb8893f141e1/materials-14-06865-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8dfb/8622101/40bd6bf2f7b2/materials-14-06865-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8dfb/8622101/aea4d411f5d7/materials-14-06865-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8dfb/8622101/39afa8b55aec/materials-14-06865-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8dfb/8622101/66225e90e403/materials-14-06865-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8dfb/8622101/e9d6c6c9c7ed/materials-14-06865-g006a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8dfb/8622101/6f7eb5900bb8/materials-14-06865-g007a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8dfb/8622101/28a341d68f8e/materials-14-06865-g008a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8dfb/8622101/ecdf1de7604c/materials-14-06865-g009a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8dfb/8622101/cb8893f141e1/materials-14-06865-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8dfb/8622101/40bd6bf2f7b2/materials-14-06865-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8dfb/8622101/aea4d411f5d7/materials-14-06865-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8dfb/8622101/39afa8b55aec/materials-14-06865-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8dfb/8622101/66225e90e403/materials-14-06865-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8dfb/8622101/e9d6c6c9c7ed/materials-14-06865-g006a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8dfb/8622101/6f7eb5900bb8/materials-14-06865-g007a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8dfb/8622101/28a341d68f8e/materials-14-06865-g008a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8dfb/8622101/ecdf1de7604c/materials-14-06865-g009a.jpg

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Materials (Basel). 2020 Jul 18;13(14):3211. doi: 10.3390/ma13143211.
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Comparison of Effects of Sodium Bicarbonate and Sodium Carbonate on the Hydration and Properties of Portland Cement Paste.碳酸氢钠和碳酸钠对波特兰水泥浆体水化及性能影响的比较
Materials (Basel). 2019 Mar 28;12(7):1033. doi: 10.3390/ma12071033.
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Material and structural characterization of alkali activated low-calcium brown coal fly ash.
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