循环流化床多元固废粉煤灰基水泥胶砂固碳试验研究  

Experimental Study on Carbon Fixation of Circulating Fluidized Bed Multi-solid Waste Fly Ash-based Cement Mortar

作　　者：燕伟 李驰[1,2,3] 邢渊浩 高瑜[1,2,3] YAN Wei;LI Chi;XING Yuanhao;GAO Yu(College of Civil Engineering,Inner Mongolia University of Technology,Hohhot 010051,China;Inner Mongolia Engineering Research Center of Geological Technology and Geotechnical Engineering,Inner Mongolia University of Technology,Hohhot 010051,China;Key Laboratory of Geological Hazards and Geotechnical Engineering Defense in Sandy and Drought Regions at Universities of Inner Mongolia Autonomous Region,Inner Mongolia University of Technology,Hohhot 010051,China)

机构地区：[1]内蒙古工业大学土木工程学院,呼和浩特010051 [2]内蒙古工业大学地质技术与岩土工程内蒙古自治区工程研究中心,呼和浩特010051 [3]内蒙古工业大学沙旱地质灾害与岩土工程防御自治区高等学校重点实验室,呼和浩特010051

出　　处：《材料导报》2025年第9期99-105,共7页Materials Reports

基　　金：国家自然科学基金(12262031);内蒙古自治区科技计划(2021GG0344);自治区直属高校基本科研业务费项目(JY20220049,JY20220051,JY20220204)。

摘　　要：为提高循环流化床(CFB)固体废弃物—“非常规”粉煤灰(CFB-FA)、炉渣(CFB-S)、脱硫石膏(CFB-FGD)利用率,减少水泥建材中的水泥用量,以CFB-FA、CFB-S、CFB-FGD复合并替代40%水泥制备循环流化床多元固废粉煤灰基水泥胶砂,基于碳化养护技术提升其力学性能,并分析固碳效果。结果表明:(1)三种材料以m(CFB-FA)∶m(CFB-S)∶m(CFB-FGD)=3∶2∶1复合并替代40%水泥制备的胶砂试件碳化养护7 d时的抗压强度为43.8 MPa,满足普通水泥胶砂标准养护28 d时的抗压强度要求;(2)对比循环流化床多元固废粉煤灰基水泥胶砂碳化前后物相组成及微观形貌发现,碳化28 d后试件表层和内部有大量CaCO_(3)生成;(3)计算分析得出其自然养护28 d后CO_(2)吸收量为21.8%,较普通水泥胶砂28 d自然碳化吸收量高约10%。该种循环流化床多元固废粉煤灰基水泥胶砂经碳化养护后不仅具备较高力学性能,而且自身固碳能力突出,有一定的工程应用价值并发挥一定的“碳中和”效应。In order to improve the utilization rate of circulating fluidized bed(CFB)solid waste—fly ash(CFB-FA),slag(CFB-S)and desulfurization gypsum(CFB-FGD),and reduce the amount of cement used in cement building materials.In this study,CFB-FA,CFB-S and CFB-FGD were used to replace 40%cement to prepare circulating fluidized bed multi-solid waste fly ash-based cement mortar.The mechanical properties were improved based on carbonization curing technology,and the carbon fixation effect was analyzed.The test results show that:(ⅰ)the compressive strength of the mortar specimen prepared by replacing 40%of cement with the three materials in m(CFB-FA)∶m(CFB-S)∶m(CFB-FGD)=3∶2∶1 is 43.8 MPa with a carbonization curing age of 7 days,which can satisfy the compressive strength requirement of the standard ordinary cement mortar with an oridinary curing age of 28 days.(ⅱ)By comparing the phase composition and microstructure of fly ash-based cement mortar before and after carbonization,a large amount of CaCO_(3) is generated on the surface and inside of the specimen with a carbonization curing age of 28 days.(ⅲ)The calculation and analysis show that the CO_(2) absorption with an oridinary curing age of 28 days is 21.8%,which is about 10%higher than the natural carbon absorption of ordinary cement mortar.This circulating fluidized bed multi-solid waste fly ash-based cement mortar not only has high mechanical properties after carbonization curing,but also has outstanding carbon fixation ability,which has certain engineering application value and“carbon neutrality”effect.

关 键 词：固废利用 循环流化床(CFB) 粉煤灰基水泥胶砂 力学性能 固碳 

分 类 号：TU528.064[建筑科学—建筑技术科学] X705[环境科学与工程—环境工程]