活性炭及其碱改性对超硫酸盐水泥抗碳化性能的影响  

Influence of Activated Carbon and Its Alkaline Treatment on Carbonation Resistance of Supersulfated Cement

作　　者：宋中旭 王洋 陈衡 葛勇[2] SONG Zhongxu;WANG Yang;CHEN Heng;GE Yong(Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials,Jinan University,Jinan 250022,China;School of Transportation Science and Engineering,Harbin Institute of Technology,Harbin 150090,China)

机构地区：[1]济南大学山东省建筑材料制备与测试技术重点实验室,济南250022 [2]哈尔滨工业大学交通科学与工程学院,哈尔滨150090

出　　处：《硅酸盐学报》2025年第2期406-415,共10页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(52102021);山东省自然科学基金(ZR2021QE058)。

摘　　要：超硫酸盐水泥(SSC)是一种由矿粉、石膏以及少量碱激发剂(5%以内,质量分数)组成的低碳胶凝材料,其抗碳化性能极差,已为其规模化应用重要瓶颈。将具有高CO_(2)吸附能力的活性炭和经氢氧化钙(CH)改性的活性炭掺入SSC(0.5%和1.0%,质量分数),探究它们对SSC碳化前后力学性能、碳化深度、物相组成、微观形貌的影响规律和机理。结果表明,活性炭可为SSC中C-(A)-S-H凝胶提供成核位点,增加C-(A)-S-H凝胶的生成量,提升C-(A)-S-H凝胶的Ca/Si比,密实孔隙结构,改善SSC的力学性能与抗碳化性能。然而,CH改性活性炭降低C-(A)-S-H凝胶的含量,增加浆体的碳化深度和孔隙率,显著降低SSC的力学性能与抗碳化性能。活性炭作为一种提升SSC抗碳化性能的有效组分,在其孔内负载其他功能组分,亦有望为SSC乃至其他水泥基材料的功能化提供重要手段。Introduction Supersulfated cement(SSC)is a low-carbon material made from slag,gypsum,and a small amount of alkali activator.However,the poor carbonation resistance limits its large-scale application.In this study,activated carbon with high CO_(2)adsorption capacity,as well as activated carbon modified by calcium hydroxide(CH),were doped into SSC(0.5%and 1.0%,in mass)to investigate the effects on the mechanical properties,carbonation depth,phase composition and microscopic morphology before and after the carbonation of SSC.This research aims at providing a effective methond to increase the carbonation resistance of SSC.Methods P·I 42.5 Portland cement(conforming to GB 175—2023),S95 powder,gypsum and coconut shell-based activated carbon particles(Jiangsu Hartel Carbon Materials Technology Co.,Ltd.)were used.The activated carbon powder particles were ball-milled and passed through a 150μm sieve.The activated carbon particles were immersed in saturated CH solution for 48 h and dried to obtain CH-modified activated carbon.The water-cement ratio of both paste and mortar specimens was 0.4.The dosage of activated carbon was 0,0.5%,and 1.0%of the total mass,respectively.The compressive strength of mortar specimens(40 mm×40 mm×160mm)were tested after curing for standard cured for 3,28 d and after carbonation for 1,3,7,14 d.The hydration degree of slag in SSC before carbonation was analyzed by EDTA method.The phase composition of hardened SSC before and after carbonation were measured by combination of a thermal gravimetric analyzer(TGA)and X-ray diffraction(XRD),The pore structure and micro-morphology hardened SSC before and after carbonation was tested by low-field nuclear magnetic resonance(LF-NMR,field emission scanning electron microscopy(ZEISS GeminiSEM 560),respectively.Results and Discussion Activated carbon significantly improved the carbonation resistance and mechanical properties of SSC.Similar to nanomaterials such as carbon nanotubes,the active functional groups on the surface of activated carbon can prov

关 键 词：超硫酸盐水泥 活性炭 抗碳化性能 微观结构 

分 类 号：TQ172.1[化学工程—水泥工业]