矿物掺合料对复合胶凝材料浆体静态屈服应力的影响

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (3): 922-928.

所属专题：资源综合利用

矿物掺合料对复合胶凝材料浆体静态屈服应力的影响

阎培渝¹, 刘宇^1,2

1.清华大学土木工程系,北京 100084;
2.中建一局集团建设发展有限公司,北京 100102

收稿日期:2023-09-15 修订日期:2023-11-20 出版日期:2024-03-15 发布日期:2024-03-27
作者简介:阎培渝(1955—),男,博士,教授。主要从事水泥基材料的研究。E-mail:yanpy@tsinghua.edu.cn
基金资助:
国家自然科学基金(51878381)

Effect of Mineral Admixture on Static Yield Stress of Complex Binder Paste

YAN Peiyu¹, LIU Yu^1,2

1. Department of Civil Engineering, Tsinghua University, Beijing 100084, China;
2. China Construction First Group Construction and Development Co., Ltd., Beijing 100102, China

Received:2023-09-15 Revised:2023-11-20 Online:2024-03-15 Published:2024-03-27

摘要/Abstract

摘要： 复合胶凝材料浆体的静态屈服应力可用于表征浆体内部微观结构建立的特性,且对新拌水泥基材料的施工与3D打印过程有很大影响。本文研究了矿物掺合料的种类和掺量对复合胶凝材料浆体静态屈服应力变化规律的影响。研究发现,矿物掺合料的细度增大使颗粒表面的水膜层厚度减小,导致浆体的静态屈服应力增大。复合胶凝材料浆体的静态屈服应力在加水搅拌后的一段时间内缓慢增加,浆体结构建立速率较小。在加水搅拌后大约1.5 h,复合胶凝材料浆体的静态屈服应力迅速增大,表明浆体内部结构的连接程度已接近不可破坏的程度,浆体开始凝结,向固体状态转变。

关键词: 静态屈服应力, 浆体结构建立, 复合胶凝材料, 矿物掺合料, 细度, 掺量, 水膜层厚度

Abstract: The static yield stress of complex binder paste characterizes its internal microstructure build-up process, which affects the construction and 3D printing process of fresh cementitious materials. The effects of kind and dosage of mineral admixture on the varying regular of the static yield stress of complex binder paste were studied. It is found that the increase of fineness of mineral admixture reduces the thickness of water film on the surface of particles and results in the increase of the static yield stress of complex binder paste. The static yield stress of complex binder paste increases slowly during the initial period after mixing with water, and the paste structure build-up rate is small. The static yield stress of complex binder paste increases quickly after mixing with water about 1.5 h. It means that the linking of paste internal structure is almost non-destroyable, and paste begins setting and transforming to a solid.

Key words: static yield stress, paste structure build-up, complex binder, mineral admixture, fineness, dosage, thickness of water film

中图分类号:

TU528

阎培渝, 刘宇. 矿物掺合料对复合胶凝材料浆体静态屈服应力的影响[J]. 硅酸盐通报, 2024, 43(3): 922-928.

YAN Peiyu, LIU Yu. Effect of Mineral Admixture on Static Yield Stress of Complex Binder Paste[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(3): 922-928.

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矿物掺合料对复合胶凝材料浆体静态屈服应力的影响

Effect of Mineral Admixture on Static Yield Stress of Complex Binder Paste

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