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Abstract
The paper is based on findings from research that assesses the potential for enhancing the performance of compressed earth bricks. A set of experiments was carried out to assess the potential for enhancing the bricks’ physical, mechanical and hygrothermal performance through the design of an optimal stabilization strategy. Three different types of bricks were fabricated: soil-cement, soil-cement-lime, and soil-cement-fiber. The different types of bricks did not exhibit significant differences in performances when assessed on the basis of porosity, density, water absorption, and compressive strength. However, upon exposure to elevated moisture and temperature conditions, the soil-cement-fiber bricks had the highest residual strength (87%). The soil-cement and soil-cement-lime bricks had residual strength values of 48.19 and 46.20% respectively. These results suggest that, like any other cement-based material, compressed earth brick properties are affected by hydration-triggered chemical and structural changes occurring in the matrix that would be difficult to isolate using tests that focus on “bulk” changes. The discussion in this paper presents findings from a research effort directed at quantifying the specific changes through an analysis of the microstructure.
Highlights
This paper reports on the findings of research efforts directed at investigating adaptations that can be made to earth bricks to improve their hygrothermal performance in hot and humid climates such asDar es Salaam, Tanzania
These results suggest that, like any other cement-based material, compressed earth brick properties are affected by hydration-triggered chemical and structural changes occurring in the matrix that would be difficult to isolate using tests that focus on “bulk” changes
The discussion in this paper presents findings from a research effort directed at quantifying the specific changes through an analysis of the microstructure
Summary
This paper reports on the findings of research efforts directed at investigating adaptations that can be made to earth bricks to improve their hygrothermal performance in hot and humid climates such asDar es Salaam, Tanzania. This paper reports on the findings of research efforts directed at investigating adaptations that can be made to earth bricks to improve their hygrothermal performance in hot and humid climates such as. The overarching goals of the research are: (1) To quantify the moisture and thermal performance of walling systems for the selected earth bricks based on data collected from. Dar es Salaam in Summer 2008; and; (2) To develop and calibrate a hygrothermal (moisture and temperature) computer model for the earth bricks that can be used to predict these materials performance in selected sites. With the exception of periods with more or less rain and the occurrence of gusty winds and electric storms, this region is characterized by very little seasonal variation throughout the year [1]. A key concern with their use is their susceptibility to moisture-related deterioration
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