摘要
研究了利用混凝土产品吸收二氧化碳的可行性。混凝土的3个基本组分:水泥、细沙和骨料,都可被用来作为二氧化碳吸附物以实现储留最大化,另外,可利用高钙钢渣等工业废料生产混凝土骨料。研究发现波特兰水泥2h碳化后吸收14%二氧化碳,碳化后的材料的强度与7d传统养护的强度相当。钢包钢渣细粉能吸收4%～12%二氧化碳,能用来替代河沙。吹氧高炉钢渣对二氧化碳吸收的能力超过12%。由此制成的粗骨料其强度可与石灰岩相比。如果混凝土砌块由这3组分组成,一块20cm×20cm×20cm的标准砌块能吸收1.39kg二氧化碳。二氧化碳在混凝土中的储留是一项经济可行、直接减排的有效技术。
The feasibility of using concrete products to uptake carbon dioxide emitted from cement production were investigated.All three primary ingredients of concrete：cement binder,fine aggregates and coarse aggregates,are considered as CO2 absorbents to maximize carbon sequestration in concrete and produce concrete aggregates from calcium-containing steel slag.It is found that two-hour carbonation enabled the Portland cement can consume ≥14% of CO2,and its strength is comparable to that after 7 d conventional curing.Ladle slag fines could take 4%-12% of CO2 due to their smaller particle size and can be used as a substitution to natural river sand.Basic oxygen furnace（BOF） slag shows an excellent reactivity with CO2.The CO2 uptake capacity in manufactured coarse BOF slag aggregates reaches 12%.The solid BOF steel slag compact produced has a strength compared to crushed limestone.If all three solid components of concrete can be used to uptake CO2,one typical concrete masonry unit（CMU,20 cm × 20 cm × 20 cm） can sequester 1.39 kg of CO2.Carbon sequestration in concrete is an economic and effective approach that directly reduces carbon emission from cement industry.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2010年第9期1645-1651,共7页
Journal of The Chinese Ceramic Society
关键词
二氧化碳养护
混凝土砌块
钢渣骨料
强度
减排
二氧化碳储留
carbon dioxide curing
concrete block
steel slag aggregate
strength
emission reduction
carbon sequestration
