Alteration of cement rheological properties and setting-hardening: Novel insight into the impact of polyaluminum sulfate

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Construction and Building Materials Pub Date : 2024-09-12 DOI:10.1016/j.conbuildmat.2024.138281

Luqing Cheng , Hao Zhang , Yang Zhou , Yucheng Li , Chongxi Xu , Jianying Deng , Zhiqiang Yang , Zhonglai Yi , Huajian Li

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Abstract

The accelerator significantly influences the setting and hardening performance of shotcrete, in order to develop novel setting components, this study investigates the underlying mechanisms through which polyaluminum sulfate (PAS) facilitates the setting of cement paste. QXRD, Isothermal calorimetry, Zeta potential and Rheological test were employed to analyze the effects of PAS addition on the setting and hardening behavior, hydration kinetics, and rheological properties of cement paste. When the dosage of PAS is 10 %, the initial and final setting times are reduced by 54.39 % and 38.57 % respectively, meanwhile the compressive strength after 6 hours increases by 659.09 %. The influence of PAS on cement setting acceleration and rheological properties were analyzed using the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory and the Water Film Thickness (WFT) theory. PAS leads to an acceleration in particle aggregation rate and an increase in shear stress and plastic viscosity of the cement paste. Furthermore, the accelerated hydration effect of PAS promotes the formation of additional hydration products, strengthens the interparticle connectivity, and facilitates the formation of a rigid network. This study highlights a novel pathway for understanding the rapid setting mechanism of aluminum-based accelerators.

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改变水泥的流变特性和凝结硬化：聚合硫酸铝影响的新见解

促进剂对喷射混凝土的凝结和硬化性能有重大影响，为了开发新型凝结组分，本研究探讨了聚合硫酸铝（PAS）促进水泥浆凝结的内在机理。研究采用了 QXRD、等温线量热法、Zeta 电位和流变试验等方法，分析了添加 PAS 对水泥浆凝结硬化行为、水化动力学和流变特性的影响。当 PAS 的掺量为 10 % 时，初凝时间和终凝时间分别缩短了 54.39 % 和 38.57 %，6 小时后的抗压强度提高了 659.09 %。使用 Derjaguin-Landau-Verwey-Overbeek (DLVO) 理论和水膜厚度 (WFT) 理论分析了 PAS 对水泥凝结加速度和流变特性的影响。PAS 导致颗粒聚集速度加快，水泥浆的剪应力和塑性粘度增加。此外，PAS 的加速水化效应促进了额外水化产物的形成，加强了颗粒间的连通性，并有利于刚性网络的形成。这项研究为了解铝基促进剂的快速凝结机制提供了一条新途径。

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.