不同养护条件下C-S-H/PCE晶种对C3S早期水化产物微观结构的影响

doi:10.16552/j.cnki.issn1001-1625.2025.0465

硅酸盐通报 ›› 2025, Vol. 44 ›› Issue (10): 3517-3524.DOI: 10.16552/j.cnki.issn1001-1625.2025.0465

不同养护条件下C-S-H/PCE晶种对C₃S早期水化产物微观结构的影响

王彦荣¹, 伍勇华¹, 易昂², 王欣¹, 陈舒文¹

1.西安建筑科技大学材料科学与工程学院,西安 710055;
2.中材建设有限公司,北京 100176

收稿日期:2025-05-05 修订日期:2025-06-07 出版日期:2025-10-15 发布日期:2025-11-03
通信作者: 伍勇华,博士,副教授。E-mail:wuyonghua@xauat.edu.cn
作者简介:王彦荣(2003—),男。主要从事水泥基材料方面的研究。E-mail:486307205@qq.com
基金资助:
陕西省自然科学基础研究计划项目(2021JM-353);西安建筑科技大学本科生科研训练项目(X202410703276)

Influences of C-S-H/PCE Seed Crystals on Microstructure of Early Hydration Products of C₃S under Different Curing Conditions

WANG Yanrong¹, WU Yonghua¹, YI Ang², WANG Xin¹, CHEN Shuwen¹

1. College of Materials Science and Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China;
2. CBMI Construction Co., Ltd., Beijing 100176, China

Received:2025-05-05 Revised:2025-06-07 Published:2025-10-15 Online:2025-11-03

摘要/Abstract

摘要： 硅酸三钙(C₃S)是硅酸盐水泥的主要矿物相,其水化产物决定着硅酸盐水泥基材料的性能。添加水化硅酸钙(C-S-H)晶种可以调控C₃S水化产物的微观结构。本文采用共沉淀法,以聚羧酸(PCE)为分散剂合成不同钙硅摩尔比的水化硅酸钙/PCE(C-S-H/PCE)晶种,通过XRD、热重分析及SEM表征,研究了C-S-H/PCE晶种对C₃S单矿物早期水化产物微观结构的影响机制。结果表明:20 ℃标养24 h时掺入C-S-H/PCE晶种可以促进C₃S水化,生成更多的氢氧化钙(CH),晶种钙硅摩尔比为1.2时诱导生成的C-S-H凝胶数量最多,结构最为致密;70 ℃蒸养24 h后,C-S-H/PCE晶种的掺入进一步提高C₃S水化产物的生成量并提高微观结构致密性。研究揭示了钙硅摩尔比与温度协同作用对C₃S水化产物数量和形貌的调控机制,为C-S-H/PCE晶种合理应用提供参考。

关键词: C₃S, C-S-H/PCE晶种, 钙硅比, 养护条件, 水化产物, 微观结构

Abstract: Tricalcium silicate (C₃S) is the main mineral phase of ordinary Portland cement (OPC), and its hydration products determine the properties of OPC-based materials. The addition of hydrated calcium silicate (C-S-H) seed crystals can regulate the microstructure of hydration products of C₃S. In this paper, polycarboxylate acid (PCE) was used as the dispersant, and the hydrated calcium silicate/PCE (C-S-H/PCE) seed crystals with different Ca/Si molar ratios were synthesized by co-precipitation method. The influence mechanism of C-S-H/PCE seed crystals on the microstructure of the early hydration products of C₃S single minerals was investigated by using XRD, thermogravimetric analysis and SEM characterization. The results show that when standard cured at 20 ℃ for 24 h, the incorporation of C-S-H/PCE seed crystals can promote the hydration of C₃S and more calcium hydroxide (CH) is formed. When the Ca/Si molar ratio of seed crystals is 1.2, the highest amount of C-S-H gel is induced and the structure is the most compact. When steam cured at 70 ℃ for 24 h, the addition of C-S-H/PCE seed crystals might further increase the quantity of C₃S hydration products and enhance the microstructure density. The study reveals the regulation mechanism of Ca/Si molar ratio and temperature synergistic effect on the quantity and morphology of C₃S hydration products, providing a reference for the rational application of C-S-H/PCE seed crystals.

Key words: C₃S, C-S-H/PCE seed crystal, calcium-silicon ratio, curing condition, hydration product, microstructure

中图分类号:

TQ172

王彦荣, 伍勇华, 易昂, 王欣, 陈舒文. 不同养护条件下C-S-H/PCE晶种对C₃S早期水化产物微观结构的影响[J]. 硅酸盐通报, 2025, 44(10): 3517-3524.

WANG Yanrong, WU Yonghua, YI Ang, WANG Xin, CHEN Shuwen. Influences of C-S-H/PCE Seed Crystals on Microstructure of Early Hydration Products of C₃S under Different Curing Conditions[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(10): 3517-3524.

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不同养护条件下C-S-H/PCE晶种对C₃S早期水化产物微观结构的影响

Influences of C-S-H/PCE Seed Crystals on Microstructure of Early Hydration Products of C₃S under Different Curing Conditions

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