The influence of stone joints width and roughness on the efficiency of biocementation sealing

Cardoso, Rafaela; Arbabzadeh, Emad; Lima, J.A. De; Flores‐Colen, Inês; Pereira, M.F.C.; Silva, Matilde Costa e; Duarte, Sofia O. D.; Monteiro, Gabriel A.

doi:10.1016/j.conbuildmat.2021.122743

Cited by 7 publications

(1 citation statement)

References 30 publications

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“…In order to further explore the causes of soil cracking, some scholars have studied the surface roughness of cracks and found that there is an inverse relationship between the roughness and the crack width. With the increase in the roughness coefficient, the normal stress on the crack surface increases gradually, while the peak value of the initial shear stress increases as well [ 9 , 10 ]. Under the influence of the alternations of drying and wetting, the pore change, geometric shape, spatial distribution, and connectivity in the soil have great influences on the soil structure and crack evolution [ 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Study on Crack Development and Micro-Pore Mechanism of Expansive Soil Improved by Coal Gangue under Drying–Wetting Cycles

Zhu

Zhang

et al. 2021

Materials

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Expansive soil is prone to cracks under a drying–wetting cycle environment, which brings many disasters to road engineering. The main purpose of this study is use coal gangue powder to improve expansive soil, in order to reduce its cracks and further explore its micro-pore mechanism. The drying–wetting cycles test is carried out on the soil sample, and the crack parameters of the soil sample are obtained by Matlab and Image J software. The roughness and micro-pore characteristics of the soil samples are revealed by means of the Laser confocal 3D microscope and Mercury intrusion meter. The results show that coal gangue powder reduces the crack area ratio of expansive soil by 48.9%, and the crack initiation time is delayed by at least 60 min. Coal gangue powder can increase the internal roughness of expansive soil. The greater the roughness of the soil, the less cracks in the soil. After six drying–wetting cycles, the porosity and average pore diameter of the improved and expanded soil are reduced by 37% and 30%, respectively, as compared to the plain expansive soil. By analyzing the cumulative pore volume and cumulative pore density parameters of soil samples, it is found that the macro-cracks are caused by the continuous connection and fusion of micro-voids in soil. Coal gangue powder can significantly reduce the proportion of micro-voids, cumulative pore volume, and cumulative pore density in expansive soil, so as to reduce the macro-cracks.

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