基于秸秆固废资源化的水泥辅助胶凝材料制备与性能  

Preparation and properties of supplementary cementing materials based on recycling of straw solid wastes

作　　者：商效瑀[1] 史华彤 龚彬 陈钰琦 SHANG Xiaoyu;SHI Huatong;GONG Bin;CHEN Yuqi(School of Civil Engineering and Architecture,Northeast Electric Power University,Jilin 123012,China)

机构地区：[1]东北电力大学建筑工程学院,吉林123012

出　　处：《复合材料学报》2025年第3期1566-1577,共12页Acta Materiae Compositae Sinica

基　　金：吉林省教育厅重大科技项目(JJKH20240155KJ)。

摘　　要：针对双碳目标下水泥及其复材降低碳排放问题,本研究以玉米秸秆固废(CSW)为原料,发展预处理-热解-研磨三步工艺,制备一种可作为水泥辅助胶凝材料的可持续生物质灰材料。重点研究了预处理方式(未处理,蒸馏水洗涤,盐酸洗涤)、热解温度(500℃、600℃、700℃)和热解时间(1 h、2 h、3 h)对CSA性能的影响,以及不同预处理类型和玉米秸秆灰(CSA)掺量对水泥砂浆性能的影响。实验结果表明,随着热解温度的升高和热解时间的增长,CSA中SiO_(2)含量逐渐增加,且热解温度对SiO_(2)结晶的影响远大于热解时间的影响。掺入量为5wt%的CSA可使砂浆抗压强度提高11.7%。当CSA掺入量超过5wt%时,过多的多孔结构导致抗压强度降低。未处理、水洗和酸洗CSA的复掺,依次引发水泥基体内水化硅酸钙(C-S-H)形貌从蜂窝状、纤维状转变为致密的凝胶状,CSW经酸洗预处理、600℃下热解2 h制备的CSA具有优异的火山灰活性,可作为良好的水泥辅助胶凝材料。This paper is aimed at the problem of reducing carbon emissions of cement and its composites under the carbon peaking and carbon neutrality goals.This study used corn straw waste(CSW)as raw material to develop a three-step process of pretreatment-pyrolysis-grinding to prepare a sustainable corn straw ash(CSA)material that can be used as supplementary cementing materials.The study focused on studying the effects of pretreatment methods(untreated,distilled water washing,hydrochloric acid washing),pyrolysis temperature(500℃,600℃,700℃)and pyrolysis durations(1 h,2 h,3 h)on CSA activity,as well as the effects of different pretreatment types and blending amounts of CSA on the performance of prepared mortars.The experimental results show that the content of SiO_(2) of CSA increases with the enhancement of pyrolysis temperature and duration.And the effect of pyrolysis temperature on SiO_(2) crystallization is much greater than that of pyrolysis durations.The incorporation of 5wt%CSA increases the compressive strength of mortar by 11.7%.The incorporation of over 5wt%CSA decreases the compressive strength due to the porous structure of CSA.The incorporation of untreated,distilled water washing and hydrochloric acid washing CSA demonstrated causes the hydrate calcium silicate(C-S-H)morphology in the cement matrix to change from honeycomb and fibrous to dense gel.The CSA treated by acid washing and pyrolysis at 600℃for 2 h shows excellent pozzolanic activity and can be used as good supplementary cementing materials.

关 键 词：辅助胶凝材料 生物质灰 火山灰活性 处理工艺 材料表征 

分 类 号：TU526[建筑科学—建筑技术科学] TB332[一般工业技术—材料科学与工程]