硅酸盐学报

极低水胶比下含钢渣粉复合浆体和含石灰石粉复合浆体的流变性能

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韩方晖 ¹^,² , 朱紫琴 ¹ , 韩雨宸 ¹ , 李雨辰 ¹ , 张增起 ³

硅酸盐学报 | 研究论文 2025,53(11): 3190-3205

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硅酸盐学报 |研究论文 2025 , 53 (11) : 3190 -3205

极低水胶比下含钢渣粉复合浆体和含石灰石粉复合浆体的流变性能

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韩方晖¹^,², 朱紫琴¹, 韩雨宸¹, 李雨辰¹, 张增起³

作者信息

^1．北京科技大学未来城市学院，北京 100083

^2．北京科技大学，城市地下空间工程北京市重点实验室，北京 10083

^3．北京科技大学冶金与生态工程学院，北京 100083

作者简介:

韩方晖（1988—），女，副教授。

Rheological Properties of Composite Pastes with Steel Slag Powder or Limestone Powder at Very Low Water/Binder Ratio

Fanghui HAN¹^,², Ziqin ZHU¹, Yuchen HAN¹, Yuchen LI¹, Zengqi ZHANG³

Affiliations

^1.School of Future Cities, University of Science and Technology Beijing, Beijing 100083, China

^2.Beijing Key Laboratory of Urban Underground Space Engineering, University of Science and Technology Beijing, Beijing 100083, China

^3.School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China

HAN Fanghui (1988-), female, Associate Professor. E-mail: hanyang-1120@163.com

出版时间: 2025-11-20 doi: 10.14062/j.issn.0454-5648.20250324

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摘要

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石灰石粉和钢渣粉作为辅助性胶凝材料广泛应用于现代混凝土中，但是极低水胶比下石灰石粉或钢渣粉对复合水泥浆体流变性能的影响仍缺乏深入研究。通过测定流动度、凝结时间、Marsh筒流动时间、流变性能和总有机碳含量，对石灰石粉和钢渣粉在极低水胶比下对复合浆体流变性能的影响进行了比较研究。结果表明，添加石灰石粉的复合浆体的流动度损失率低于添加钢渣粉的复合浆体。与添加钢渣粉相比，添加石灰石粉显著缩短了复合浆体的凝结时间和Marsh筒流动时间，且添加石灰石粉的复合浆体具有更好的流变性能和更强的触变性。添加钢渣粉的复合浆体的总有机碳含量低于添加石灰石粉的复合浆体，但添加石灰石粉的样品中自由水含量更高。与添加钢渣粉相比，在极低水胶比下，石灰石粉对复合浆体流变性能的影响更有利。

关键词

复合浆体 / 石灰石粉 / 钢渣粉 / 流变性能 / 极低水胶比

Abstract

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Introduction

The widespread use of cement in concrete leads to increased carbon emissions, so the demand for supplementary cementitious materials increases significantly. Limestone powder and steel slag powder are widely used as supplementary cementitious materials in modern concrete. However, for UHPC and self-compacting concrete, an extremely low water/binder (W/B) ratio is on one hand a key factor in achieving ultra-high strength and ultra-low porosity of the materials, on the other hand, also leads to the deterioration of the rheological properties of the fresh paste. Meanwhile, the existing researches focus on the influence of single limestone powder or steel slag powder on the mechanical properties or microstructure of cement-based materials. Little work on the influence of steel slag powder or limestone powder on the rheological properties of composite paste at an extremely low water/binder ratio has been investigated quantitatively. The mechanism of the effect of steel slag powder or limestone powder on the rheological properties of composite paste at extremely low water/binder ratios is still unclear. In this work, the effects of steel slag powder and limestone powder on the rheological properties of composite paste at different low water/binder ratios were analyzed via determining the flow diameter, setting time, marsh cone flow time, rheological parameters, and total organic carbon content.

Methods

A composite paste was prepared with P.I 42.5 ordinary Portland cement, steel slag powder, limestone powder, blast furnace slag and silica fume as raw materials in a certain proportion. To achieve the preparation of composite paste with extremely low water/binder ratios, a polycarboxylate superplasticizer with a water/reducing rate of 40% (Jiangsu Subot New Materials Co., Ltd., China) was used. The dosage of polycarboxylate superplasticizer for the composite paste with different water/binder ratios of 0.16 and 0.21 was 2% and 0.8%, respectively.

Composite pastes with different proportions of steel slag powder or limestone powder at water/binder ratios of 0.16 and 0.21 were prepared. The flow diameter (i.e., the larger the flow diameter, the better the fluidity), setting time (i.e., the time when the fluidity is lost) and marsh cone flow time (i.e., the shorter the flow time, the better the fluidity) were determined to analyze the fluidity of the composite pastes. the rheological properties of composite paste at a water/binder ratio of 0.16 for rheological properties tests were determined, and the rheological parameters were obtained by the H-B model. The adsorption performance of the polycarboxylate superplasticizer was analyzed by testing the TOC content.

Results and discussion

When the ratio of water/binder is 0.16, both limestone powder and steel slag powder initially increase the flow diameter of the composite paste. However, the fluidity of the composite paste decreases over time, and the reduction is more pronounced with steel slag powder. This is because the nucleation and hydration promotion effect of limestone powder can reduce the loss rate of flow diameter, while the rough particles of steel slag powder increase the internal friction force, resulting in a decrease in the flow diameter of composite paste. Adding limestone powder and steel slag powder both shortens the setting time and marsh cone flow time of the composite paste. However, the steel slag powder addition of 30 % delays the final setting time due to its delaying effect. Also, limestone powder can enhance the thixotropy and reduce the yield stress and plastic viscosity, thereby improving the rheological properties. In contrast, steel slag powder can increase the yield stress and plastic viscosity, thereby weakening the rheological properties and thixotropy. Steel slag powder and limestone powder both can enhance the adsorption effect of polycarboxylate superplasticizer. Steel slag powder has a stronger adsorption effect. The composite paste containing limestone powder has a higher free water content. This is because the rough and porous surface of steel slag itself and the uneven particle shape lead to the physical adsorption of polycarboxylate superplasticizer molecules on the surface of steel slag particles, thereby reducing the effective content of the water reducer dispersion. Increasing the water/binder ratio to 0.21 results in a decrease in the flow diameter of the composite paste. Furthermore, the setting time and marsh cone flow time can prolong due to the reduction in the dosage of polycarboxylate superplasticizer.

Conclusions

The results showed that the fluidity loss rate of composite paste with limestone powder could be lower than that of composite paste with steel slag powder. Compared to steel slag powder, the addition of limestone powder reduced the setting time and marsh cone flow time of the composite paste. The addition of limestone powder could shorten the yield stress and plastic viscosity of the composite paste. Therefore, the composite paste with limestone powder had better rheological properties and stronger thixotropy rather than that with steel slag powder. The addition of limestone powder could improve the rheological properties of the composite paste. Compared to composite paste with limestone powder, a better adsorption effect of polycarboxylate superplasticizer on the surface of the composite binder with steel slag powder could be obtained. The free water content of the composite paste with limestone powder was still higher than that of the composite paste with steel slag powder. The fluidity and rheological properties of the composite paste with limestone powder could be better. The comprehensive analysis indicated that a positive effect of limestone powder on rheological properties of composite paste at an extremely low water/binder ratio could be more dominant than that of steel slag powder.

Key words

composite paste / limestone powder / steel slag powder / rheological properties / extremely low water/binder ratio

引用本文

韩方晖, 朱紫琴, 韩雨宸, 李雨辰, 张增起. 极低水胶比下含钢渣粉复合浆体和含石灰石粉复合浆体的流变性能. 硅酸盐学报, 2025 , 53 (11) : 3190 -3205 . DOI: 10.14062/j.issn.0454-5648.20250324

Fanghui HAN, Ziqin ZHU, Yuchen HAN, Yuchen LI, Zengqi ZHANG. Rheological Properties of Composite Pastes with Steel Slag Powder or Limestone Powder at Very Low Water/Binder Ratio[J]. Journal of the Chinese Ceramic Society, 2025 , 53 (11) : 3190 -3205 . DOI: 10.14062/j.issn.0454-5648.20250324

基金

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国家自然科学基金(52293433; 52478232)

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2025年第53卷第11期

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文章信息

doi: 10.14062/j.issn.0454-5648.20250324

接收时间：2025-04-22
首发时间：2026-10-21
出版时间：2025-11-20

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收稿日期：2025-04-22
修回日期：2025-05-25

基金

国家自然科学基金(52293433; 52478232)

作者信息

^1．北京科技大学未来城市学院，北京 100083

^2．北京科技大学，城市地下空间工程北京市重点实验室，北京 10083

^3．北京科技大学冶金与生态工程学院，北京 100083

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2种不同金属材料的力学参数

科 Family	属数 Number of genus	种数 Number of species	占总种数比例 Percentage of total species (%)	属 Genus	种数 Number of species	占总种数比例 Percentage of total species (%)
鹅膏菌科Amanitaceae	2	11	5.26	鹅膏菌属 Amanita	10	4.78
小菇科 Mycenaceae	2	12	5.74	丝盖伞属 Inocybe	5	2.39
多孔菌科 Polyporaceae	8	14	6.70	蜡蘑属 Laccaria	5	2.39
红菇科 Russulaceae	3	23	11.00	小皮伞属 Marasmius	6	2.87
				小菇属 Mycena	11	5.26
				光柄菇属 Pluteus	5	2.39
				红菇属 Russula	17	8.13
				栓菌属 Trametes	5	2.39

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