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 ℃
房延凤 1惠一心 1尚小朋 2丁向群 1佟钰1
作者信息
- 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
- 折叠
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C3S和C2S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.
Abstract
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 C3 S 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Key words
Nano C-S-H/stability/10 ℃/early hydration/compressive strength引用本文复制引用
出版年
2024
NETL
NSTL
万方数据