碳化养护对含再生微粉泡沫混凝土性能的影响  

Effect of Carbonation Curing on Properties of Foam Concrete Containing Recycled Concrete Powder

作　　者：叶涛华 周子晗 肖建庄[1,2] 段珍华 YE Taohua;ZHOU Zihan;XIAO Jianzhuang;DUAN Zhenhua(Department of Structural Engineering,College of Civil Engineering,Tongji University,Shanghai 200092,China;Institute of Dual Carbon Science and Technology,Guangxi University,Nanning 530004,China)

机构地区：[1]同济大学土木工程学院建筑工程系,上海200092 [2]广西大学双碳科学与技术研究院,南宁530004

出　　处：《硅酸盐通报》2025年第3期872-882,共11页Bulletin of the Chinese Ceramic Society

基　　金：新疆维吾尔自治区重点研发任务专项项目(2022B03036-3);广西重大科技专项(桂科AA24263035)。

摘　　要：泡沫混凝土因具有优异的保温性能而被广泛应用,但其生产过程中大量使用水泥导致碳排放量较高。本文研究了废弃混凝土再生微粉取代和碳化养护技术对泡沫混凝土性能的影响。28 d标准养护下,与未取代的试件相比,当再生微粉质量取代率为10%时,试件的性能相似,当取代率为30%时,试件的孔隙率增幅为10.9%,抗压强度降幅为21.3%,导热系数降幅为11.7%。与28 d标准养护的同类试件相比,当碳化养护龄期为3 d时,试件的性能差异较小,当碳化养护龄期为7 d时,试件的孔隙率降幅为4.6%~13.4%,抗压强度增幅为9.8%~16.7%,导热系数增幅为6.4%~11.3%。所有试件均满足非承重保温隔热外墙材料的规范要求,且性能优于现有文献报道的泡沫混凝土。此外,本文表征了上述技术对泡沫混凝土物相组成的影响,并强调了新型泡沫混凝土的高固碳率,约为12.99%(以5 mm表层计)。综上所述,再生微粉取代与碳化养护的结合显著提高了泡沫混凝土的性能和固碳效果,有助于制备新型低碳泡沫混凝土产品。Foam concrete is widely used due to its excellent thermal insulation properties,but the large amount of cement used in its production process leads to high carbon emissions.This study investigated the effects of recycled concrete powder(RCP)replacement and carbonation curing technology on the properties of foam concrete.After 28 d of standard curing,compared with unsubstituted specimens,the properties of specimens containing 10%(mass fraction)RCP are similar.When the RCP replacement rate is 30%(mass fraction),the porosity of specimens increases by 10.9%,the compressive strength decreases by 21.3%,and the thermal conductivity decreases by 11.7%.Compared with counterparts with 28 d standard curing,the properties differences are minimal after 3 d of carbonation curing.After 7 d of carbonation curing,the porosity of specimens decreases by 4.6%~13.4%,the compressive strength increases by 9.8%~16.7%,and the thermal conductivity increases by 6.4%~11.3%.All specimens meet the specification requirements for non-loadbearing thermal insulation exterior wall materials,surpassing the properties of foam concrete reported in the existing literature.Additionally,this study characterizes the phase assemblage of foam concrete,highlighting the high carbon fixation rate of this novel foam concrete,about 12.99%measured using 5 mm of the surface layer.In summary,combining RCP replacement and carbonation curing significantly improves foam concrete properties and carbon fixation capacity,which helps to prepare a novel low-carbon foam concrete product.

关 键 词：泡沫混凝土 废弃混凝土 再生微粉 碳化养护 抗压强度 导热系数 

分 类 号：TU528[建筑科学—建筑技术科学]