纳米C-S-H晶核早强剂对水泥早期水化的影响  

Effect of Nano-C-S-H Seeds Early-Strength Agent on Early Hydration of Cement

作　　者：张金龙 唐孟雄 衷从浩 胡家兵 邵强 钟开红 ZHANG Jinlong;TANG Mengxiong;ZHONG Conghao;HU Jiabing;SHAO Qiang;ZHONG Kaihong(Guangzhou Institute of Building Science Group Co.,Ltd.,Guangzhou 510440,China;Guangzhou Municipal Construction Group Co.,Ltd.,Guangzhou 510030,China)

机构地区：[1]广州市建筑科学研究院集团有限公司,广州510440 [2]广州建筑股份有限公司,广州510030

出　　处：《硅酸盐通报》2025年第1期21-30,共10页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(52341801,52378332);广东省住房和城乡建设厅科技创新计划项目(2021-K25-284959,2022-K25-212467);广州市建筑集团有限公司科技计划项目(〔2021〕-KJ015,〔2023〕-KJ020);广州市建筑科学研究院集团有限公司科技计划项目(2022Y-KJ03,2023Y-KJ03)。

摘　　要：探究纳米水化硅酸钙(C-S-H)晶核早强剂对水泥早期水化的影响机理有助于推动纳米C-S-H晶核早强剂在实际工程中的应用。本文首先通过共沉淀法合成了尺寸均匀分布的纳米C-S-H晶核早强剂,借助力学性能、水化热测试对比分析了所合成纳米C-S-H掺量变化的作用规律及其与常用早强剂的效果差异,并通过XRD、TG-DTG、SEM测试分析了纳米C-S-H对水泥水化历程的影响。结果表明:随着所合成纳米C-S-H晶核早强剂掺量的增加,混凝土1 d抗压强度、水化放热速率及水化放热量的提升幅度先增加后减小,在纳米C-S-H掺量为0.6%(质量分数)时,早强剂的早强效果最佳,且对7、28 d抗压强度无负面影响;相比空白组,纳米C-S-H的加入显著提升了水泥诱导期的水化速率,以及1 d龄期内AFm、AFt及C-S-H凝胶的生成量和密集程度,但对中后期龄期水化产物的生成无明显促进作用。Investigating the impact mechanisms of nano-C-S-H seeds early-strength agent on the early hydration of cement is pivotal for advancing their application in practical engineering.By comparing mechanical properties and hydration heat tests,the effect of varying content of synthesized nano-C-S-H and the differences in effects compared to commonly early-strength agents were analyzed.Additionally,XRD,TG-DTG and SEM were employed to elucidate the effect of nano-C-S-H on the cement hydration process.The results demonstrate that increasing the content of the synthesized nano-C-S-H seeds early-strength agent leads to an initial rise in 1 d compressive strength,hydration heat release rate,and total hydration heat,followed by a decline.The optimal early-strength effect is observed at content of 0.6% by mass of the cementitious materials.When the content of nano-C-S-H is 0.6%,the nano-C-S-H seeds early-strength agent has the best early-strength effect and has no negative effect on the compressive strength at 7 and 28 d.Compared to the blank group,the addition of nano-C-S-H significantly enhances the hydration rate during the cement induction period,as well as the formation and density of AFm,AFt and C-S-H gels during the 1 d age,but has no significant effect on the formation of hydration products at the middle and late ages.

关 键 词：纳米C-S-H晶核早强剂 成核位点 抗压强度 水化热 水化产物 微观形貌 

分 类 号：TU528[建筑科学—建筑技术科学]