碱激发再生微粉-矿渣制备泡沫保温材料及其性能  

Preparation and Properties of Foam Insulation Material by Alkali-activate Recycled Powder-ground Granulated Blast Furnace Slag

作　　者：姚田帅 田青 张苗 祁帅 王成 阮梦月 YAO Tianshuai;TIAN Qing;ZHANG Miao;QI Shuai;WANG Cheng;RUAN Mengyue(School of Civil Engineering and Architecture,Henan University,Kaifeng 475004,Henan,China;State Key Laboratory of Green Building Materials,Beijing 100024,China;Anhui Institute of Strategic Study in Carbon Emissions Peak and Carbon Neutrality in Urban-rural Development,Hefei 230601,China)

机构地区：[1]河南大学土木建筑学院,河南开封475004 [2]绿色建筑材料国家重点实验室,北京100024 [3]安徽省建设领域碳达峰碳中和战略研究院,合肥230601

出　　处：《硅酸盐学报》2023年第11期2966-2977,共12页Journal of The Chinese Ceramic Society

基　　金：绿色建筑材料国家重点开放基金(2021GBM01);河南省高等学校重点科研项目计划(22B560002);安徽省建设领域碳达峰碳中和战略研究院开放课题资助(AHSTY-2022-02)。

摘　　要：采用物理发泡法以再生微粉和矿渣为主要原料,NaOH溶液为碱激发剂,制备了泡沫保温材料,通过测试泡沫的失活过程与浆体的流变特性,并结合硬化后试件的物理力学性能,探讨了碱激发剂掺量、CaCl_(2)·6H_(2)O掺量以及预制泡沫掺量对泡沫保温材料性能的影响,并借助图像分析法与X射线衍射分析了其微观结构及反应机理。结果表明:试样的抗压强度随碱激发剂掺量的增加先增大后减小,并在碱掺量为5%时达到最大值,但碱掺量对孔隙率与干密度的影响较小。CaCl_(2)·6H_(2)O的加入显著缩短了浆体的凝结时间,使得浆体与预制泡沫达到较好的匹配状态,可有效细化孔隙并提高试件的抗压强度与热惰性。改变泡沫掺量可有效调控材料的密度等级,随着泡沫掺量的增加,孔隙分布逐渐粗化,抗压强度及导热系数不断下降。矿渣与再生微粉的活性皆可被有效激发,两者可起到协调补充的作用,达到协同利用固废的效果。A foam insulation material was prepared by a wet foam mixing method with recycled powder and slag as main raw materials.The effects of alkali activator CaCl_(2)⋅6H_(2)O dosage and the preformed foam on the performance of foam insulation materials were investigated via testing the stabilization time of the foam,the condensing characteristics of the slurry,as well as the compressive strength,dry density,porosity and thermal conductivity of the specimens.The pore structure and reaction mechanism were analyzed by image analysis and X-ray diffraction.The results show that the compressive strength of the specimens firstly increases and then decreases with the increase of alkali exciter,and it reaches the maximum value at 5%of alkali activator,but the dosage of alkali activator has little effect on the porosity and dry density.The addition of CaCl_(2)⋅6H_(2)O significantly shortens the setting time of the slurry,thus favoring that the slurry and the prefabricated foam reach a better matching state,effectively refine the pores and improve the compressive strength and thermal inertia of the specimens.Different density grades of foam insulation materials can be prepared at different amounts of foam admixture.The pore size distribution becomes wider and the compressive strength and thermal conductivity decrease with the increase of foam admixture.The activity of both slag and recycled powder can be effectively stimulated,which can play a coordinating and complementary role to achieve the effect of synergistic utilization of solid waste.

关 键 词：再生微粉 矿渣 碱激发 泡沫保温材料 

分 类 号：TU528[建筑科学—建筑技术科学]