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化学煅烧电石渣的性质及其对水泥性能的影响。

Properties of Chemically Combusted Calcium Carbide Residue and Its Influence on Cement Properties.

作者信息

Sun Hongfang, Li Zishanshan, Bai Jing, Memon Shazim Ali, Dong Biqin, Fang Yuan, Xu Weiting, Xing Feng

机构信息

Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, College of Civil Engineering, Shenzhen University, Shenzhen 518060, Guangdong, China.

Department of Civil Engineering, COMSATS Institute of Information Technology, Abbottabad 22010, Pakistan.

出版信息

Materials (Basel). 2015 Feb 13;8(2):638-651. doi: 10.3390/ma8020638.

DOI:10.3390/ma8020638
PMID:28787963
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5455282/
Abstract

Calcium carbide residue (CCR) is a waste by-product from acetylene gas production. The main component of CCR is Ca(OH)₂, which can react with siliceous materials through pozzolanic reactions, resulting in a product similar to those obtained from the cement hydration process. Thus, it is possible to use CCR as a substitute for Portland cement in concrete. In this research, we synthesized CCR and silica fume through a chemical combustion technique to produce a new reactive cementitious powder (RCP). The properties of paste and mortar in fresh and hardened states (setting time, shrinkage, and compressive strength) with 5% cement replacement by RCP were evaluated. The hydration of RCP and OPC (Ordinary Portland Cement) pastes was also examined through SEM (scanning electron microscope). Test results showed that in comparison to control OPC mix, the hydration products for the RCP mix took longer to formulate. The initial and final setting times were prolonged, while the drying shrinkage was significantly reduced. The compressive strength at the age of 45 days for RCP mortar mix was found to be higher than that of OPC mortar and OPC mortar with silica fume mix by 10% and 8%, respectively. Therefore, the synthesized RCP was proved to be a sustainable active cementitious powder for the strength enhanced of building materials, which will result in the diversion of significant quantities of this by-product from landfills.

摘要

电石渣是乙炔气生产过程中产生的一种废弃副产品。电石渣的主要成分是Ca(OH)₂，它可以通过火山灰反应与硅质材料发生反应，生成类似于水泥水化过程中得到的产物。因此，有可能用电石渣替代波特兰水泥用于混凝土中。在本研究中，我们通过化学燃烧技术合成了电石渣和硅灰，以制备一种新型活性胶凝粉末（RCP）。评估了用RCP替代5%水泥时新拌及硬化状态下的浆体和砂浆的性能（凝结时间、收缩率和抗压强度）。还通过扫描电子显微镜（SEM）研究了RCP和普通波特兰水泥（OPC）浆体的水化情况。试验结果表明，与对照OPC混合料相比，RCP混合料的水化产物形成时间更长。初凝和终凝时间延长，而干燥收缩显著降低。发现RCP砂浆混合料在45天时的抗压强度分别比OPC砂浆和掺硅灰的OPC砂浆高10%和8%。因此，合成的RCP被证明是一种可持续的活性胶凝粉末，可用于增强建筑材料的强度，这将使大量这种副产品从垃圾填埋场转移。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/df13/5455282/839f02f5736b/materials-08-00638-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/df13/5455282/8f0a63940f2c/materials-08-00638-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/df13/5455282/74abbf22e06d/materials-08-00638-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/df13/5455282/e1c7edf2fa21/materials-08-00638-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/df13/5455282/874f469560f5/materials-08-00638-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/df13/5455282/80ce20ef4acf/materials-08-00638-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/df13/5455282/518bffa7e06f/materials-08-00638-g006a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/df13/5455282/f961ff005959/materials-08-00638-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/df13/5455282/839f02f5736b/materials-08-00638-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/df13/5455282/8f0a63940f2c/materials-08-00638-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/df13/5455282/74abbf22e06d/materials-08-00638-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/df13/5455282/e1c7edf2fa21/materials-08-00638-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/df13/5455282/874f469560f5/materials-08-00638-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/df13/5455282/80ce20ef4acf/materials-08-00638-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/df13/5455282/518bffa7e06f/materials-08-00638-g006a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/df13/5455282/f961ff005959/materials-08-00638-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/df13/5455282/839f02f5736b/materials-08-00638-g008.jpg

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