Abstract Previous research suggest that repeated swelling of the clay minerals involve differential strain during wetting and drying cycles which may induce decay under a fatigue of the clay rich material. Scaling due to this process has been observed on some stone binding clay but also on earthen material used in architecture. Since recent years, research on the conservation of clay-rich sandstones lead to the development of bifunctional cationic surfactants as swelling reducers for sandstones with high hygric and hydric dilatation. In this paper, the butyl diammonium dichloride surfactant was experimented on earthen material to reduce important hygric dilatation which leads to fast and important decay of earthen material. It has been directly added into the clay mixture of molded adobe brick that was to be physically and mechanically tested. The aim is to further investigate the interaction of the surfactant with clay minerals. Series of experiments showed great impact on various physical-mechanical properties of the molded earthen mixtures. Some could have been expected according to the function of the surfactant, which is to block the micropores within the clay mineral structures, responsible for the swelling. Thus, the decrease of the specific surface area as well as the hygric dilatation is understandable. However, according to the concentration of surfactant used within the adobe mixture, other properties are also affected such as the ultrasonic velocity, the water uptake coefficient, the hydric shrinkage and the compressive strength. Therefore this paper underlines important influences in changes of properties of molded adobe according to the concentration of surfactant used, and the cation exchange capacity of the material. The paper will show a new approach consisting in adapting the concentration of surfactant as a function of cation exchange capacity (CEC) of the material.

中文翻译：

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CEC 输入，用于评估二氯化丁基二铵作为富粘土材料中的溶胀降低剂

摘要 先前的研究表明，粘土矿物的反复膨胀涉及润湿和干燥循环期间的不同应变，这可能会在富含粘土的材料疲劳下引起腐烂。在一些石头粘合粘土以及建筑中使用的土质材料上已经观察到由于这个过程而产生的结垢。近年来，对富粘土砂岩保护的研究导致了双功能阳离子表面活性剂的发展，作为具有高湿膨胀和水膨胀的砂岩的溶胀降低剂。在本文中，丁基二氯化二铵表面活性剂在土质材料上进行了实验，以减少导致土质材料快速而重要的腐烂的重要湿膨胀。它被直接添加到要进行物理和机械测试的模压土坯砖的粘土混合物中。目的是进一步研究表面活性剂与粘土矿物的相互作用。一系列实验表明，对模制土混合料的各种物理机械性能有很大影响。根据表面活性剂的功能，可以预期某些情况，即阻塞粘土矿物结构内的微孔，导致膨胀。因此，比表面积的减少以及湿膨胀是可以理解的。然而，根据土坯混合物中表面活性剂的浓度，其他性能也会受到影响，如超声波速度、吸水系数、水收缩率和抗压强度。因此，本文强调了根据所用表面活性剂浓度对模制土坯性能变化的重要影响，和材料的阳离子交换能力。该论文将展示一种新方法，包括根据材料的阳离子交换容量 (CEC) 调整表面活性剂的浓度。