Compression behavior of MICP-treated sand with various gradations

Xiao, Yang; Zhao, Chang; Sun, Yue; Wang, Shun; Wu, Huanran; Chen, Hui; Liu, Hanlong

doi:10.1007/s11440-020-01116-2

Cited by 97 publications

(23 citation statements)

References 76 publications

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“…from 50 to 800 kPa). For MICPtreated sand, an obvious increase in compressibility has been also observed due to the breakage of CaCO 3 cementation and abrasion/attrition of sand grains [79]. The compression index (C c ) under each r' v was calculated based on the following equation 3 shows that C c values continued to increase with the increasing r' v for both biopolymer-treated and untreated soils.…”

Section: Coefficient Of Volume Compressibility and Compression Indexmentioning

confidence: 99%

Mechanical and biodeterioration behaviours of a clayey soil strengthened with combined carrageenan and casein

Geng

2022

Acta Geotech.

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In the last decade, biopolymers have been used as organic soil binders in ground improvement and earthen construction material modification. Although biopolymer-treated soils have substantially enhanced mechanical strength, the deformation characteristics under external loads and material durability (e.g. biodeterioration due to microbial activity) have not yet been fully understood, which limits the in situ practical application of the biopolymer-based soil treatment technology. This study investigated the efficiency of combined carrageenan and casein in strengthening a clayey soil with the biodeterioration consideration. Both mechanical tests (e.g. unconfined compressive strength and one-dimensional consolidation) and biological tests (e.g. high throughput sequencing and rating of mould growth) were conducted. Results indicated that the usage of the carrageenan–casein mixture induced a higher soil compressive strength compared with either carrageen or casein, due to the formation of a three-dimensional gel network. In addition, carrageenan–casein mixture and casein decreased the compressibility of the clayey soil, which might be attributed to the casein’s peculiarity of self-associating into micelles, leading to minimal interactions with water molecules. Carrageenan, due to its affinity for water, increased the soil compressibility. Under the impact of microbial activity, the biopolymer-treated soils underwent deterioration in both surface appearance (i.e. coloured stains and patches caused by mould growth) and compressive strength. A linear relationship was proposed, in which a reduction in compressive strength by approximately 11% is expected while the rating of mould growth is increased by one in a five-rating system. The current research demonstrates that the soil reinforcement with combined carrageenan and casein is able to improve both soil strength and deformation behaviours. It is also suggested to take into account the biodeterioration considerations in the design and implementation of biopolymer-based soil reinforcement practices.

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Section: Coefficient Of Volume Compressibility and Compression Indexmentioning

confidence: 99%

Mechanical and biodeterioration behaviours of a clayey soil strengthened with combined carrageenan and casein

Geng

2022

Acta Geotech.

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“…For a given vertical effective stress or input work, specimens with a larger bio‐cementation content exhibited smaller particle breakage and vertical strain. The formed bio‐cementation serves to restrain particle breakage and compressibility mainly via three mechanisms: (1) increase the effective diameter of soil particles; (2) dissipate energy during loading; and (3) remain in the void and reduce the magnitude of particle contact forces through a cushioning effect (Xiao et al, 2020a; Xiao et al, 2020b).…”

Section: Characterization Of Micp Processesmentioning

confidence: 99%

Bio‐mediated soil improvement: An introspection into processes, materials, characterization and applications

Jiang

Wang

Chu

et al. 2021

Soil Use and Management

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For a long time in the practice of geotechnical engineering, soil has been viewed as an inert material, comprising only inorganic phases. However, microorganisms including bacteria, archaea and eukaryotes are ubiquitous in soil and have the capacity and capability to alter bio‐geochemical processes in the local soil environment. The cumulative changes could consequently modify the physical, mechanical, conductive and chemical properties of the bulk soil matrix. In recent years, the topic of bio‐mediated geotechnics has gained momentum in the scientific literature. It involves the manipulation of various bio‐geochemical soil processes to improve soil engineering performance. In particular, the process of microbial‐induced calcium carbonate precipitation (MICP) has received the most attention for its superior performance for soil improvement. The present work aims to shape a comprehensive understanding of recent developments in bio‐mediated geotechnics, with a focus on MICP. Referring to around one hundred studies published over the past five years, this review focuses on popular and alternative MICP processes, innovative raw materials and additives for MICP, emerging tools and testing methodologies for characterizing MICP at multi‐scale, and applications in emerging and/or unconventional geotechnical fields.

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“…A total of 4 rounds of grouting were carried out, and each injection volume was one specimen pore volume (i.e., 50 mL). The specimens were prepared at a room temperature of approximately 25 °C [ 37 ]. The schematic diagram of the grouting procedure is shown in Figure 4 below.…”

Section: Methodsmentioning

confidence: 99%

Effects of Different Types of Fibers on the Physical and Mechanical Properties of MICP-Treated Calcareous Sand

et al. 2021

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Microbial-induced calcite precipitation (MICP) has been a promising method to improve geotechnical engineering properties through the precipitation of calcium carbonate (CaCO3) on the contact and surface of soil particles in recent years. In the present experiment, water absorption and unconfined compressive strength (UCS) tests were carried out to investigate the effects of three different fiber types (glass fiber, polyester fiber, and hemp fiber) on the physical and mechanical properties of MICP-treated calcareous sand. The fibers used were at 0%, 0.10%, 0.15%, 0.20%, 0.25%, 0.30%, 0.35%, and 0.40% relative to the weight of the sand. The results showed that the failure strain and ductility of the samples could be improved by adding fibers. Compared to biocemented sand (BS), the water absorption of these three fiber-reinforced biocemented sands were, respectively, decreased by 11.60%, 21.18%, and 7.29%. UCS was, respectively, increased by 24.20%, 60.76%, and 6.40%. Polyester fiber produced the best effect, followed by glass fiber and hemp fiber. The optimum contents of glass fiber and polyester fiber were 0.20% and 0.25%, respectively. The optimum content of hemp fiber was within the range of 0.20–0.25%. Light-emitting diode (LED) microscope and scanning electron microscope (SEM) images lead to the conclusion that only a little calcite precipitation had occurred around the hemp fiber, leading to a poor bonding effect compared to the glass and polyester fibers. It was therefore suggested that polyester fiber should be used to improve the properties of biocemented sand.

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Compression behavior of MICP-treated sand with various gradations

Cited by 97 publications

References 76 publications

Mechanical and biodeterioration behaviours of a clayey soil strengthened with combined carrageenan and casein

Mechanical and biodeterioration behaviours of a clayey soil strengthened with combined carrageenan and casein

Bio‐mediated soil improvement: An introspection into processes, materials, characterization and applications

Effects of Different Types of Fibers on the Physical and Mechanical Properties of MICP-Treated Calcareous Sand

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