Hygrothermal Properties of a Composite Based on Clay Soils and Diatomite  

作　　者：Togdjim Jonas Malloum Soultan Modjinguem F. Ronelngar Mahamat S. Abdel-Khadir Alexis M. Nanimina Michel Querry Togdjim Jonas;Malloum Soultan;Modjinguem F. Ronelngar;Mahamat S. Abdel-Khadir;Alexis M. Nanimina;Michel Querry(Mechanical Engineering Department, Higher National Institute of Sciences and Techniques of Abch, Abch, Chad;Technology Department, University of NDjamena, NDjamena, Chad;National Center for Development Research (CNRD), NDjamena, Chad;Mechanical Department, National Institute Superior of Sciences Appliqued, Lyon, France)

机构地区：[1]Mechanical Engineering Department, Higher National Institute of Sciences and Techniques of Abch, Abch, Chad [2]Technology Department, University of NDjamena, NDjamena, Chad [3]National Center for Development Research (CNRD), NDjamena, Chad [4]Mechanical Department, National Institute Superior of Sciences Appliqued, Lyon, France

出　　处：《Open Journal of Civil Engineering》2024年第3期363-373,共11页土木工程期刊（英文）

摘　　要：The purpose of this paper is to make a contribution to the use of diatomite as a mineral additive in the composition of compressed earth blocks. The aim is to study the influence of diatomite on the hygrothermal behaviour of composites based on clay soils. For this reason, two clay soils with different physicochemical and mineralogical compositions were incorporated with diatomite at percentages ranging from 5% to 50% with a step of 5 to produce compressed earth blocks. After assessing the hydric and thermal characteristics of the composites, it was found that the incorporation of diatomite into the clay matrix favours the absorption of water by capillary action for all the composites. The diatomite-amended blocks subjected to the rain erosion test were less eroded than the unamended blocks. In addition, BYD composites were found to be more resistant than BTD composites, due to the high percentage of clay in T soil. The thermal conductivity of the latter decreases respectively from 0.72 to 0.29 W/m∙K for BTD composites and from 0.52 to 0.21 W/m∙K for BYD composites. This reduction proves the thermal insulating properties of diatomite. Despite the high capillary absorption capacity of these composites, they have good thermal properties, enabling them to be used in the construction of buildings for improved indoor thermal comfort.The purpose of this paper is to make a contribution to the use of diatomite as a mineral additive in the composition of compressed earth blocks. The aim is to study the influence of diatomite on the hygrothermal behaviour of composites based on clay soils. For this reason, two clay soils with different physicochemical and mineralogical compositions were incorporated with diatomite at percentages ranging from 5% to 50% with a step of 5 to produce compressed earth blocks. After assessing the hydric and thermal characteristics of the composites, it was found that the incorporation of diatomite into the clay matrix favours the absorption of water by capillary action for all the composites. The diatomite-amended blocks subjected to the rain erosion test were less eroded than the unamended blocks. In addition, BYD composites were found to be more resistant than BTD composites, due to the high percentage of clay in T soil. The thermal conductivity of the latter decreases respectively from 0.72 to 0.29 W/m∙K for BTD composites and from 0.52 to 0.21 W/m∙K for BYD composites. This reduction proves the thermal insulating properties of diatomite. Despite the high capillary absorption capacity of these composites, they have good thermal properties, enabling them to be used in the construction of buildings for improved indoor thermal comfort.

关 键 词：Clay Soil DIATOMITE Capillary Absorption Erodibility and Thermal Conductivity 

分 类 号：TB3[一般工业技术—材料科学与工程]