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2018 Vol.9, Issue 4 Preview Page

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Contribution to the study of the impact of sulphates, temperature and humidity on the behaviour of Compressed Stabilized Earth Blocks CSEB
Sihem Chaibeddra1*
,
Fattoum Kharchi1
1University of Science and Technology Houari Boumediene USTHB, FGC, LBE
* Corresponding Author
31 December 2018. pp. 222-238
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Abstract

The use of Compressed Stabilized Earth Blocks CSEB as a masonry unit is still growing in many countries because of their low impact on the environment. However, in addition to being sensitive to weather variations like humidity and temperature, earthen constructions are subjected to chemical agents such as sulphates. This work deals with the assessment of the impact of sulphates combined with temperature and humidity on the behaviour of CSEB in terms of compressive strength and mass loss. Earth blocks have been stabilized with different amounts of two types of cement, namely: CEM II, and CEM I resistant to sulphates. The compressive strengths under humid and tempered conditions were first measured. Physical properties involving shrinkage and thermal conductivity, which are depending on humidity and temperature, were measured based on cement amount variation. A correlation between these two parameters and the compressive strength was discussed. The impact of sulphates combined with humidity and temperature was then investigated. The results show that contrary to humidity, temperature increases the compressive strength as much as the cement amounts rise. Cement dosage favours the thermal conductivity, and opposes the shrinkage. The CEM II is particularly more efficient than the CEM I under the effect of temperature. On the other hand, the compressive strength is weakened in the presence of sulphates. However, the use of CEM I resistant to sulphates at high percentage can make the blocks withstanding the action of sulphates. The mass of CSEB is modified after the exposure to sulphates, humidity and temperature. Sulphates fill the air pores under the effect of temperature through crystallization of products issued from their reactions with cement. This leads to less material losses contrary to water exposure that causes leaching of soluble products.

Keywords
CSEB
CEM I
CEM II
humidity
temperature
sulphates
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Information
  • Publisher :Sustainable Building Research Center (ERC) Innovative Durable Building and Infrastructure Research Center
  • Publisher(Ko) :건설구조물 내구성혁신 연구센터
  • Journal Title :International Journal of Sustainable Building Technology and Urban Development
  • Volume : 9
  • No :4
  • Pages :222-238
  • Received Date : 2018-10-01
  • Accepted Date : 2018-12-03
  • DOI :https://doi.org/10.22712/susb.20180022
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