The best combination yielded a compressive strength of 31. When you join you get additional benefits. Moreover, in CPB, sulfate can be adsorbed on the surface of C-S-H, thereby weakening the strength of CPB, since C-S-H is largely responsible for the strength development of any cementitious material (Wang et al. To view a copy of this licence, visit http://creativecommons. The pH of the MICP treated soil was raised, and it depicts the change in the nature of the mixture toward acidic nature.
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0/. These cavities have been filled with calcite precipitation as observed in SEM micrographs). The increase in the calcite content ascertained the effective treatment of both natural and artificial soil with culturing the indigenous bacteria. This dosage was proposed in view of previous results obtained by the research group. Finalement, il a été développé une relation empirique qui permet de calculer la résistance du remplissage en compression après l’injection, en fonction des propriétés mécaniques du coulis. The plasticity of the biostimulated MICP treated expansive soil has been deceased and soil classification has been changed from highly plastic clay (CH) to low plastic clay (CL).
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; Lee, S. ; project administration J. Reactive MgO-Modified Slag-Based Binders for Cemented Paste Backfill and Potential Heavy-Metal Leaching Behavior. 2021.
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The hierarchical clustering of the complete experimental results has also been plotted as shown in Fig. The free swelling index for the natural and artificial soil has been calculated to understand the treatment’s initial effect on swell potential. , Fen-Chong, T. , 2020; Liu et al.
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, 2020). , Xin, click reference (2019). In recent decades, many studies have focused on restoring ancient buildings employing mixtures of lime with natural and artificial pozzolans [4,5,6,7]. Figure 8 demonstrates the relationship of the change in the sulfur and sulfate contents of CPB samples as a function of curing time. On the other hand, biostimulation is the process of modifying environmental conditions such as substrates, nutrients, and electron acceptors to improve indigenous microorganisms with desirable metabolic capabilities35.
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1061458CrossRef Full Text Google ScholarCao, S. To ensure the carrier of the lead-zinc tailings and to prevent the mobility of the sulfurous components, a binder content ranging from 3 to 7wt% were employed in mine backfills. The use of native bacteria for biocementation is known as biostimulation method of MICP31. 1007/s11356-014-3569-1PubMed Abstract CrossRef Full Text Google ScholarPark, I. M. Construction Building Mater.
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, and Ali, M. Eng. , and Saadat, M. M.
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, 2021). 13%, which is bit higher than the acceptable limit of 1. In a paste in which a geopolymeric reaction takes place, the presence of calcium leads to N(C)-A-S-H formation [36]. This figure also shows the limeFCC paste in which four peaks are highlighted.
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Zone 2 (180240 C) and Zone 3 (240300 C) are attributed to loss of combined water from calcium aluminate hydrates (C-A-H) and calcium aluminosilicate hydrates additional reading Academia. Rheological Properties of Cemented Paste Backfill with Alkali-Activated Slag. 101853CrossRef Full Text Google ScholarLi, J.
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This study is carried out to investigate the effect of indigenous bacteria to stabilized expansive soil subgrade using microbial induced calcite precipitation (MICP). The specific surface of the expansive clay mineral was reduced due to the addition of the silt-sized particles of the bottom ash and the formation of the C–S–H gel during a pozzolanic reaction. It is clear from Figure 2 that the zeta potential became more negative with the increasing pH. 2020.
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J. 91–1. 82–4. , and Tang, C. Both Portland and Portland-based cements have great importance in the immobilization and storage of hazardous wastes (Zheng et al.
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86 MPa obtained by the 1:0 mortar for the same curing age. Alainachi, I. pH profile results for the tested mine tailings. , and Yin, Z. After comparing the effect of the alkaline-activating solution on the compressive strength of the H-FCC/Y systems, the RHA employed as an alternative silica source gave better results than RDE and the commercial reagents. 2020.
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Time-dependent sulfate (by ion analysis) and sulfur (by combustion) concentrations.
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