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Influence of additives on poured earth strength development
Materials and Structures ( IF 3.8 ) Pub Date : 2020-10-01 , DOI: 10.1617/s11527-020-01564-y
Daria Ardant , Coralie Brumaud , Guillaume Habert

The aim of this paper is to study the influence of the deflocculation/flocculation process on the cohesion of clay-based materials by investigating the changes in their internal structure. Indeed, as the cohesion of earth materials finds its origin in the capillary forces between clay particles, strongly linked to the porosity of the material, the relationship between the additives, porosity and compressive strength must be understood. The fresh state properties and hardened state properties of the clay mortars, mix designed with different types of mineral additives (phosphate-based as a dispersant and calcium and magnesium based as a coagulant), were determined and compared to those of their micro- and macrostructure based on thermal gravimetric analysis. The results show that the dispersant has a strong impact on the compression strength of clay-based materials due to the optimized organization of the clay particles during the deflocculation step, leading to an increase in the capillary force intensity. Experiments confirm that coagulants decrease the global porosity and compression strength according to their solubility and reaction time. When the reaction between the dispersant and the coagulant is slow, the benefit of the dispersant on clay platelet organization, which influences the mortar stiffness and global porosity, is maintained, and the final strength is high. The TGA confirms that the coagulant has no impact on the microporosity and that the earth material returns to its initial state. Finally, guidelines for mixing and pouring can be highlighted to maximize the strength of poured earth without the addition of hydraulic binder.

中文翻译:

添加剂对浇筑土强度发展的影响

本文的目的是通过研究粘土基材料内部结构的变化,研究反絮凝/絮凝过程对粘土基材料内聚力的影响。事实上,由于土壤材料的内聚力源于粘土颗粒之间的毛细管力,与材料的孔隙率密切相关,因此必须了解添加剂、孔隙率和抗压强度之间的关系。测定了粘土砂浆的新鲜状态和硬化状态,混合了不同类型的矿物添加剂(磷酸盐作为分散剂,钙和镁作为混凝剂),并与它们的微观和宏观结构进行了比较基于热重分析。结果表明,分散剂对粘土基材料的抗压强度有很大影响,因为在反絮凝步骤中粘土颗粒的优化组织,导致毛细管力强度增加。实验证实混凝剂会根据其溶解度和反应时间降低整体孔隙率和抗压强度。当分散剂与混凝剂之间的反应缓慢时,分散剂对粘土片晶组织的影响得以保持,从而影响砂浆刚度和整体孔隙率,最终强度较高。TGA 确认混凝剂对微孔率没有影响,并且地球材料恢复到其初始状态。最后,
更新日期:2020-10-01
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