Evaluation of Mechanical Properties of Adobe Chemically Stabilized with "Synthetic Termite Saliva"

Corrêa, Andréa Aparecida Ribeiro; Bufalino, Lina; Protásio, Thiago de Paula; Ribeiro, Marcelo Xisto; Wisky, Danilo; Mendes, Lourival Marin

doi:10.4028/www.scientific.net/kem.600.150

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…The second factor is that with the greater addition of STS, the water loss will be faster; therefore, cracks may occur in its drying process, reducing its resistance to compression. Faria et al (2016), using STS with cement in soilcement, obtained a significant increase in the resistance to compression; whereas Corrêa et al (2014b), using only STS in several proportions, obtained small differences in the resistance to compression. This result shows that to improve the compressive strength of the adobes, it is necessary use STS with other stabilizers.…”

Section: Resultsmentioning

confidence: 90%

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Physical, Mechanical and Thermal Behavior of Adobe Stabilized With “Synthetic Termite Saliva”

et al. 2019

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Adobe is an efficient construction material for several reasons, such as its thermal comfort, sustainability, and lower energy cost, as well as the simplicity of its production and execution. However, challenges such as water absorption, capillarity, and compressive strength should be investigated to improve its physical and mechanical properties. "Synthetic termite saliva" (STS) is an excellent stabilizer with high cohesive and hydrophobic power. Therefore, the objective of this work was to evaluate the effects of STS incorporation into adobe, analyzing its physical, mechanical and thermal properties. Five treatments were studied: 0 (control); 0.1; 0.2; 0.4 and 0.8% STS by mass. These adobe samples were evaluated according to bulk density, linear shrinkage, capillarity, water absorption, thermal conductivity and compressive strength, according to Norma Técnica de Edificación (NTE) E0.80 testing using a new methodology. Linear shrinkage decreases from 2.7 to 1.91 cm with 0.4% STS. Capillarity decreases with the increasing amounts of STS. Water absorption decreased from 12.03 to 6.31% using 0.4% STS, and its mass was reduced from 779 to 19 grams. The thermal conductivity showed no differences between concentrations. The compressive strength was reduced but was still acceptable based on NTE E.080. The stabilization of the adobe using STS showed an improvement in its physical properties, mainly due to its hydrophobic power.

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Section: Resultsmentioning

confidence: 90%

“…There has been some research using STS in adobe. Corrêa et al (2014aCorrêa et al ( , 2014bCorrêa et al ( , 2015, found excellent results in the physical-mechanical properties of adobe, mainly due to the stabilization when the adobe came in contact with water. In soil-cement, Faria et al (2016) found satisfactory results using STS.…”

Section: Introductionmentioning

confidence: 98%

Physical, Mechanical and Thermal Behavior of Adobe Stabilized With “Synthetic Termite Saliva”

et al. 2019

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Machine Learning Approaches for Prediction of the Compressive Strength of Alkali Activated Termite Mound Soil

et al. 2021

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Earth-based materials have shown promise in the development of ecofriendly and sustainable construction materials. However, their unconventional usage in the construction field makes the estimation of their properties difficult and inaccurate. Often, the determination of their properties is conducted based on a conventional materials procedure. Hence, there is inaccuracy in understanding the properties of the unconventional materials. To obtain more accurate properties, a support vector machine (SVM), artificial neural network (ANN) and linear regression (LR) were used to predict the compressive strength of the alkali-activated termite soil. In this study, factors such as activator concentration, Si/Al, initial curing temperature, water absorption, weight and curing regime were used as input parameters due to their significant effect in the compressive strength. The experimental results depict that SVM outperforms ANN and LR in terms of R2 score and root mean square error (RMSE).

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Development of Sustainable and Eco-Friendly Materials from Termite Hill Soil Stabilized with Cement for Low-Cost Housing in Chad

et al. 2021

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This paper explores the effects of cement stabilization (5, 10, 15 and 20 wt%) on the structural and mechanical properties (compressive/flexural strengths and fracture toughness) of abandoned termite mound soil. The crystal structures and crystallinity of the constituents were determined using X-ray diffraction (XRD), while the microstructure was characterized via scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). The functional groups were also identified using Fourier transform infra-red spectroscopy (FTIR). The compressive/flexural strengths of the stabilized and un-stabilized termite mound soil were also studied after curing for 7, 14 and 28 days. The fracture toughness mechanism was analyzed with the aid of the R-curve method. Additionally, the underlying deformation and cracking mechanisms are elucidated via in-situ/ex-situ optical and scanning electron microscopy. The stabilized termite mound soil displayed the highest mechanical properties of 13.91 MPa, 10.25 MPa and 3.52 kPa·m1/2 for compressive strength, flexural strength and fracture toughness, respectively. Besides displaying good mechanical properties and being locally available at no cost, renewable and an eco-friendly material, the termite mound soil will contribute to lowering the cost of housing in Sub-Saharan Africa, particularly in Chad.

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Evaluation of Mechanical Properties of Adobe Chemically Stabilized with "Synthetic Termite Saliva"

Cited by 3 publications

References 7 publications

Physical, Mechanical and Thermal Behavior of Adobe Stabilized With “Synthetic Termite Saliva”

Physical, Mechanical and Thermal Behavior of Adobe Stabilized With “Synthetic Termite Saliva”

Machine Learning Approaches for Prediction of the Compressive Strength of Alkali Activated Termite Mound Soil

Development of Sustainable and Eco-Friendly Materials from Termite Hill Soil Stabilized with Cement for Low-Cost Housing in Chad

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