Effect of production and curing conditions on the performance of stabilized compressed earth blocks: Kaolinite vs quartz
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MRS Advances © 2020 Materials Research Society DOI: 10.1557/adv.2020.155
Effect of production and curing conditions on the performance of stabilized compressed earth blocks: Kaolinite vs quartz-rich earthen material Philbert Nshimiyimana 1, 2, *, Hassan Seini Moussa 1, Adamah Messan 1, Luc Courard 2 Laboratoire Eco-Matériaux et Habitats Durables (LEMHaD), Institut International d’Ingénierie de l’Eau et de l’Environnement (Institut 2iE), Rue de la Science, 01, BP 594 Ouagadougou 01, Burkina Faso.
1
2
Urban and Environmental Engineering (UEE), Université de Liège (ULiege), Allée de la Découverte, 9, 4000 Liège, Belgium.
* Corresponding author: Philbert Nshimiyimana; [email protected].
Abstract
This study investigated the effect of production and curing parameters on the mechanical performance of compressed earth blocks (CEBs) stabilized with 0-20 wt % CCR (calcium carbide residue). Kaolinite (K) and quartz (Q)-rich earthen materials were mixed with the CCR and used to mould CEBs at optimum moisture content (OMC) and OMC+2 % of the dry mixtures, cured at 20 °C, ambient temperature in the lab (30±5 °C) and 40 °C for 0-90 days. After curing, the reactivity of the materials and compressive strength of dry CEBs were tested. Increasing the moulding moisture from OMC to OMC+2 decreased the compressive strength 0.3 times (4.4 to 3.3 MPa) for the CEBs stabilized with 20 % CCR cured at 30±5 °C for 45 days. Similarly, the compressive strength (4.4 MPa) was reached by CEBs stabilized with 10 and 20 % CCR after 28 and 45 days of curing, respectively. At 40 °C, the compressive strength increased 3.3 times (1.1 to 4.7 MPa with 0 to 20 % CCR) for K-rich and 2.5 times (2 to 7.1 MPa) for Q˗rich materials. At 20 °C, the compressive strength increased only 1.3 times (1.1 to 2.5 MPa) for K˗rich and barely 0.7 times (2 to 3.4 MPa) for Q-rich materials. These suggest that CCR is useful for stabilization and improving the performances of CEBs in hot regions.
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INTRODUCTION The increasing interests in compressed earth blocks (CEBs) as masonry materials, in the last decades, prove their potential for construction of modern buildings [1˗9]. More recently, calcium carbide residue (CCR), a lime-rich by˗product, proved to be beneficial stabilizer of CEBs alternative to cement and industrial lime [3,5,8]. CCR owes its benefits from the recycling of a by-product material, otherwise considered as waste [3]. The value of the CCR, as an innovative earth stabilizer instead of Portland cement, is also evidenced by its pozzolanic reaction with clayey earthen materials [8]. Thus, the usage of the CCR would reduce the environmental impacts not only in terms of waste management and CO2 emissions related to the production of the cement but also the stress to the natural resources. This results i
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