[This article belongs to Volume - 56, Issue - 02]
Gongcheng Kexue Yu Jishu/Advanced Engineering Science
Journal ID : AES-09-03-2024-678

Title : Structural Evaluation of Wormhole Concretionary Laterite Stone Masonry Bonded with Different Mortar Types
Emmanuel Benon, Catherine Githuku, Marclus Mwai,

Abstract : Despite the application of wormhole concretionary laterite stone masonry in the construction industry, the subject lacks adequate information within the scientific community. Also, there is currently a controversy around the influence of mortar grades on the compressive strength of masonry. As much as some authors assert that mortar strength considerably improves masonry strength, others argue that the increase is minimal. Consequently, this study delved into appraising the compressive strength, deformation capacity, and bond strength of laterite stone masonry bonded with cement, lime, and cement-starch mortar. The evaluation was carried out experimentally. The results revealed average compressive strengths of 15MPa, 16MPa, and 13MPa for cement, cement-lime, and cement-starch mortar, respectively, exceeding the 12.4 MPa minimum requirements by ASTM C270. The bond analysis presents cement mortar masonry as having superior bond strength (0.38MPa) compared to cement-lime and cement-starch mortars (0.036MPa and 0.046MPa), respectively. This implies that real-world lateral forces will be better resisted by laterite stone masonry built with cement mortars. Moreover, on average, cement mortar masonry was found to top in compressive strength (1.4MPa), followed by cement-lime (1.28MPa) and cement-starch (0.58MPa), indicating the impact of mortar on the strength of masonry. The average deformations for laterite stone masonry bonded with cement, cement-lime, and cement-starch mortar were 18.88mm, 11.59mm, and 28.19mm, respectively. Decisively, the three types of masonry are recommended, but cement-lime is deemed economical and efficient, although the compressive strength is minimally compromised with the addition of lime. The use of lime also contributes to the reduction of the carbon footprint.