负温条件下不同溶液拌合硫铝酸盐水泥性能演化规律及机制  

Performance Evolution Laws and Mechanisms of Calcium Sulphoaluminate Cement Mixed with Different Solutions at Sub-Zero Temperature

作　　者：张鸿飞 任俊儒 叶家元 任雪红 张洪滔 翟牧楠 栾政彬 ZHANG Hongfei;REN Junru;YE Jiayuan;REN Xuehong;ZHANG Hongtao;ZHAI Munan;LUAN Zhengbin(State Key Laboratory of Green Building Materials,China Building Materials Academy,Beijing 100024,China;Department of Military Installations,Army Logistics Academy of PLA,Chongqing 401331,China)

机构地区：[1]中国建筑材料科学研究总院有限公司,绿色建筑材料国家重点实验室,北京100024 [2]中国人民解放军陆军勤务学院军事设施系,重庆401311

出　　处：《硅酸盐学报》2024年第2期624-640,共17页Journal of The Chinese Ceramic Society

基　　金：军队后勤科研项目(BLJ18C014);国家自然科学基金重点项目(51832006);中国建材集团攻关专项资助项目(2021HX0304)。

摘　　要：负温条件下将与环境等温的物料现场直接拌合、浇筑、免加热养护的低温施工技术称为冷施工。为了探寻负温条件下使用冷施工方案时适合硫铝酸盐水泥水化及性能发展的拌合溶液,采用水化温升表征、力学性能测试、X射线衍射结合Rietveld精修分析、扫描电子显微镜观察等方法,研究了-10℃条件下有机与无机2大类共10种溶液拌合硫铝酸盐水泥的性能演化规律及机制。结果表明:氯化钙和硝酸钙溶液可促进水化,表现为水化温升大、早期强度高,试样峰值温度分别可达23.6℃和20.4℃,12 h抗压强度分别可达21.5 MPa和16.5 MPa;两者28 d抗压强度分别为101.8 MPa和19.6 MPa。碳酸钾溶液拌合试样水化温升较大、早期强度较高,试样峰值温度可达7.7℃,12 h抗压强度可达13.9MPa,但28d抗压强度仅增长至19.3MPa。氯化镁、氯化钠和亚硝酸钠溶液水化促进作用不明显,水化温升小、早期强度低,试样峰值温度均低于5℃,12 h抗压强度均小于5 MPa,但28 d抗压强度增长明显,分别达到74.0、42.7 MPa和39.2 MPa。甲醇、乙醇、乙二醇和丙三醇溶液几乎不具备水化促进作用,水化温升不明显(试样峰值温度不超过–5℃)、12 h几乎不具备强度,且28 d后甲醇、乙醇和乙二醇溶液拌合试样的抗压强度也极低;然而,丙三醇溶液拌合试样28 d抗压强度可达到23.5 MPa。-10℃条件下宜采用氯化钙溶液拌合硫铝酸盐水泥,此条件下可获得足够高的早、后期强度。Introduction Calcium sulphoaluminate cement has a potential application in sub-zero temperature environments due to its rapid hydration,rapid setting,fast strength development,and high early strength.In cold construction sites,such as polar regions,the materials and the concrete both are exposed to sub-zero temperatures for extended periods.It is thus necessary to investigate the formation,condensation,hardening and microstructures of calcium sulphoaluminate cement at sub-zero temperatures.Cold concreting method widely recognized involves directly blending raw materials on-site at the same temperature as the ambient environment,even at sub-zero temperatures,follows via pouring and curing fresh concrete without supplemental heating.Choosing a suitable mixing solution is crucial for the effective cold concreting technology.The mixing solution must prevent freezing of both the solution and the cement pastes at sub-zero temperatures,initiating the cement hydration reaction and enabling continuous progression.Also,the properties of the mixing solution(i.e.,p H value and ion concentration)affect the dissolution and hydration of clinker minerals,leading to consequential changes in cement characteristics.In this paper,the performance evolution laws and mechanisms of calcium sulphoaluminate cement mixed with different mixing solutions at sub-zero temperatures were investigated.Methods Deionized water was used as a solvent.Six inorganic analytical pure chemical reagents and four organic analytical pure chemical reagents were used as solutes.Each of these reagents was dissolved individually in deionized water at room temperature.The solution was stirred until in a homogeneous state and left standing for 24 h.To ensure the temperature of the materials as the environmental temperature,the calcium sulphoaluminate cement and the mixing solution both were placed in a sub-zero temperature experimental system for a storage period of at least 24 h.All processes,i.e.,sample shaping and curing,were carried out in the sub-zero tempera

关 键 词：冷施工 拌合溶液 硫铝酸盐水泥 水化 

分 类 号：TQ172[化学工程—水泥工业]