10℃条件下纳米C-S-H掺量对水泥早期水化的影响  

Effects of Nano C-S-H Content on Early Hydration of Cement at 10℃

作　　者：房延凤 惠一心 尚小朋 丁向群[1] 佟钰[1] FANG Yanfeng;HUI Yixin;SHANG Xiaopeng;DING Xiangqun;TONG Yu(School of Materials Science and Engineering,Shenyang Jianzhu University,Shenyang,China,110168;Department of Architectural Engineering,Shandong Urban Construction Vocational College,Ji′nan,China,250103)

机构地区：[1]沈阳建筑大学材料科学与工程学院,辽宁沈阳110168 [2]山东城市建设职业学院建筑工程系,山东济南250103

出　　处：《沈阳建筑大学学报（自然科学版）》2024年第3期505-512,共8页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(51808354)。

摘　　要：目的探究10℃条件下不同掺量纳米C-S-H对水泥早期水化进程及强度发展的影响,并分析其早强剂作用机理。方法通过溶液共沉淀法制备纳米C-S-H悬浮液,将其掺入到普通硅酸盐水泥中,在10℃条件下进行养护,分析其对水泥凝结时间、抗折强度、抗压强度的影响;通过XRD、TG等检测手段分析水泥的水化进程及对水化产物的影响。结果掺入0.05%纳米C-S-H,可使水泥初凝时间缩短9.9%,终凝时间缩短10.4%;24 h时抗折强度和抗压强度分别提高了34%和33.5%。纳米C-S-H的掺入造成水泥3 d抗折强度略有降低。水化产物中Ca(OH)2质量分数在12 h、16 h和24 h时较参比样分别提高了17.6%、21.3%和29.6%。结论在10℃条件下,纳米C-S-H的加入能够有效促进C 3S和C 2S的水化过程,形成更多的水化产物,从而缩短水泥凝结时间,提高24 h内水泥砂浆强度,28 d强度没有显著降低。The influence of nano C-S-H on the hydration process and development of early strength of cement at 10℃was explored,and the mechanism of its early strength enhancement was analyzed.In this paper,nano C-S-H suspension was prepared by solution coprecipitation method,and it was mixed with ordinary Portland cement.The effects of nano C-S-H on setting time,flexural strength and compressive strength at 10℃were analyzed;Its effects on hydration process and hydration products were tested by XRD and TG.The initial setting time and final setting time were reduced by 9.9%and 10.4%when 0.05%of nano C-S-H was doped.Corresponding,the 24 h flexural strength and compressive strength increased by 34%and 33.5%.The addition of nano C-S-H resulted in a slight decrease in the 3 d strength.The content of Ca(OH)2 at 12 h,16 h and 24 h increased by 17.6%,21.3%and 29.6%,respectively,compared to the reference specimen.The addition of nano C-S-H can effectively promote the hydration process of C 3S to form more hydration products,shorten the setting time of cement and improve the strength of cement mortar within 24 h at 10℃.And no obvious decrease in 28 d compressive strength was observed.

关 键 词：纳米C-S-H 稳定性 10℃ 早期水化 抗压强度 

分 类 号：TU528.041[建筑科学—建筑技术科学]