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Carbonation curing of alkaline industrial waste for binders: comparison of different wastes
Magazine of Concrete Research ( IF 2.7 ) Pub Date : 2021-01-04 , DOI: 10.1680/jmacr.20.00133
Yanfeng Fang 1 , Yuzhuo Zhang 2 , Miao Zhang 1 , Mingyu Zhao 1 , Qinghe Wang 3
Affiliation  

The potential of utilising alkaline industrial waste with weak or no cementitious properties for carbon dioxide (CO2) capture and for new binders by accelerated carbonation was studied; steel slag (SS), calcium carbide residue (CCR) and waste hydrated cement (WHC) were compared. The carbon dioxide uptake and strength development of SS, CCR and WHC were studied and the relationship of strength development with carbon dioxide uptake and characteristics of carbonation products was analysed. The results indicate that carbon dioxide uptake of SS, CCR and WHC strongly depends on the mineral composition: calcium hydroxide (Ca(OH)2) and calcium silicate hydrate (C–S–H) show relatively higher carbonation activity; dicalcium silicate (Ca2SiO4) absorbs less carbon dioxide than calcium hydroxide and C–S–H. The carbon dioxide uptake of SS, CCR and WHC are 6.1, 23.2 and 17.9%, respectively, after 2 h carbonation curing. Compacted SS, CCR and WHC specimens displayed a compressive strength of 74.9, 20.5 and 28.6 MPa after carbonation for 2 h. Compressive strength development depends on carbon dioxide uptake and mechanical properties of raw materials and carbonation products. Calcium carbonate (CaCO3) and amorphous products fill the pore structure, making the matrix denser; improvement of pore structure relates positively to carbon dioxide uptake. The highest compressive strength of compacted SS is mainly caused by the high elastic modulus of SS and formation of C–S–H gel in the carbonation process.

中文翻译:

用于粘合剂的碱性工业废物的碳化固化:不同废物的比较

研究了利用具有弱胶结性质或没有胶结性质的碱性工业废物捕获二氧化碳 (CO 2 ) 和通过加速碳酸化制备新粘合剂的潜力;比较了钢渣(SS)、电石渣(CCR)和废弃水化水泥(WHC)。研究了SS、CCR和WHC的二氧化碳吸收和强度发展,分析了强度发展与二氧化碳吸收和碳酸化产物特性的关系。结果表明,SS、CCR 和 WHC 的二氧化碳吸收在很大程度上取决于矿物组成:氢氧化钙 (Ca(OH) 2 ) 和水合硅酸钙 (C–S–H) 显示出相对较高的碳化活性;硅酸二钙(Ca 2 SiO 4) 吸收的二氧化碳少于氢氧化钙和 C–S–H。碳化固化 2 小时后,SS、CCR 和 WHC 的二氧化碳吸收率分别为 6.1%、23.2% 和 17.9%。压实的 SS、CCR 和 WHC 试样在碳化 2 小时后显示出 74.9、20.5 和 28.6 MPa 的抗压强度。抗压强度的发展取决于二氧化碳吸收量以及原材料和碳酸化产品的机械性能。碳酸钙(CaCO 3)和无定形产物填充孔隙结构,使基体更加致密;孔结构的改善与二氧化碳的吸收呈正相关。压实的 SS 的最高抗压强度主要是由于 SS 的高弹性模量和碳化过程中形成的 C-S-H 凝胶。
更新日期:2021-01-04
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