A baseline study was conducted to evaluate the influence of composition enzyme-induced carbonate precipitation (EICP) treatment solution on efficiency precipitation. EICP is an emerging biogeotechnical ground-improvement technique in which calcium precipitated from aqueous within soil pores. consisting 1 M urea, 0.67 chloride (CaCl2), and 3 g/L urease enzyme (reported activity 3,500 U/g) identified as preferred for soil, because that concentration ingredients results high mass, efficiency,...

Specimens of silica sand treated via enzyme induced carbonate precipitation (EICP) showed surprisingly high strength at a relatively low content when non-fat powdered milk was included in the treatment solution. EICP is biologically-based soil improvement technique that uses free urease to catalyze hydrolysis urea an aqueous solution, producing ions and alkalinity presence calcium cations leads carbonate. The achieved less than 1.4% single cycle unprecedented compared results reported...

The development of alternatives to soil stabilization through mechanical and chemical has paved the way for biostabilization methods. Since its development, researchers have used different bacteria species treatment. Soil treatment bioremediation techniques been understand effect on strength parameters contaminant remediation. Using a living organism binding grains make mass dense durable is basic idea biotreatment. Bacteria enzymes are commonly utilized in biostabilization, which common...

A study was conducted to stabilize An Nafud desert sand against wind-induced erosion employing enzyme-induced carbonate precipitation (EICP) assisted by a sodium alginate (SA) biopolymer. Biopolymers occur naturally in brown seaweed, are inexpensive, and used extensively the food, textile, paper industries as thickeners emulsifiers. wind tunnel experiment evaluate rate of samples treated surficially spraying various concentrations mixes using EICP SA solutions. The unconfined strength...

The utilization of industrial by-products as stabilizers is gaining attention from the sustainability perspective. Along these lines, granite sand (GS) and calcium lignosulfonate (CLS) are used alternatives to traditional for cohesive soil (clay). unsoaked California Bearing Ratio (CBR) was taken a performance indicator (as subgrade material low-volume roads). A series tests were performed by varying dosages GS (30%, 40%, 50%) CLS (0.5%, 1%, 1.5%, 2%) different curing periods (0, 7, 28...

Kuttanad region in Kerala, India, is a place that predominantly consists of soft soil formations with low shear strength and water resistance rendering them problematic for construction purposes. Pavements constructed on such deposits have been subjected to structural rutting the high erodibility in-situ necessitates need use suitable ground improvement techniques. The present environmental scenario demands implementation sustainable techniques rejuvenation effective stabilizers enhancing...

Soil treatment methods to cope with ever-growing demands of construction industry and environmental aspects are always explored for their suitability in different in-situ conditions. Of late, enzyme induced calcite precipitation (EICP) is gaining importance as a reliable technique improve soil properties contaminant remediation scenarios. In the present work, swelling permeability characteristics two native Indian cohesive soils (Black Red) explored. Experiments on sorption desorption...

This study evaluated the efficacy of enzyme induced calcite precipitation (EICP) in restricting mobility heavy metals soils. EICP is an environmentally friendly method that has wide ranging applications sustainable development civil infrastructure. The examined desorption three from treated and untreated soils using ethylene diamine tetra-acetic acid (EDTA) citric (C6H8O7) extractants under harsh conditions. Two natural spiked with cadmium (Cd), nickel (Ni), lead (Pb) were studied this...

We have developed a novel method to synthesize hyper-branched biomimetic hydrogel network across soil matrix improve the mechanical strength of loose and simultaneously mitigate potential contamination due excessive ammonium. This successfully yielded hierarchical structure that possesses water retention, ion absorption, aggregation capabilities plant root systems in chemically controllable manner. Inspired by robust organic–inorganic composites found many living organisms, we combined this...

The global construction industry consumes huge amounts of mined materials that are considered unsustainable for earth resources. In addition, Portland cement which is a key element in concrete and most one the main contributors to worldwide CO2 emissions. On other hand, natural cemented soil deposits examples sustainable structures have survived decades severe environmental conditions. Mimicking these biological systems provide an alternative current practices production. Enzyme-induced...

Traditional soil stabilization techniques, such as cement and lime, are known for their menacing effect on the environment through heavy carbon emissions. Sustainable methods grabbing attention, utilization of biopolymers is surely one among them. Recent studies proved efficiency in enhancing geotechnical properties to meet requirements construction industry. The suitability biopolymer application different soils still unexplored, footprint analysis (CFA) crucial promoting a promising...

Enzyme-induced calcite precipitation (EICP) emerges as a highly effective and well-established technique within bio-cementation approaches, offering notable advantages over traditional methods. Conversely, lime, known for its accessibility, cost-effectiveness, efficacy, serves valuable material in enhancing the engineering properties of problematic soils. This study explores application EICP lime treatments separately on two distinct soils (low-plastic high-plastic soil) exhibiting different...

Recently, the improvement of engineering properties soil has been centered on using sustainable and eco-friendly materials. This study investigates efficacy three biopolymers: Acacia, sodium alginate, pectin, unconfined compressive strength (UCS) dune sand. The UCS test measured effects biopolymer type concentration, curing intervals temperature, moisture loss. changes in morphology caused by addition were examined via scanning electron microscopy (SEM). Results indicate that...

The current study aims at examining the effect of different calcium-based stabilizers {calcium hydroxide [Ca(OH)2], calcium carbonate [CaCO3], and chloride [CaCl2]} on geotechnical properties lime-leaching behavior expansive clay. tests were conducted clay samples that compacted maximum Proctor dry density values relying specially fabricated molds subjected to water flow conditions for a specific period (up 7 days). In order pore fluid lime-leachability patterns, pH leaching solution was...

Abstract Calcium carbonate precipitation using a urease enzyme, referred to herein as Enzyme-Induced Carbonate Precipitation (EICP) is technique for soil improvement. In this technique, mixed solution composed of reagents and the which produces calcite, utilized grouting material. Recently, alternative materials enzyme have been examined resolve cost issue enzyme. study, several tests were conducted compare commercial soybean-derived crude urease. A comparison their hydrolysis rates was done...

Enzyme induced carbonate precipitation (EICP) for vertical columnar stabilization and soil nailing has been demonstrated in bench scale testing. In EICP, of calcium (CaCO3) is via hydrolysis urea using free urease enzyme. The enzyme introduced into the an aqueous solution containing ions to precipitate CaCO3. precipitated CaCO3 improves strength stiffness increases dilatancy by filling pores, roughening particles, binding particles together. EICP was used improve around 51 mm- 76 mm-diameter...

One of the significant issues persisting in study soil stabilization is establishment optimum proportions quantity stabilizer to be added soil. Determining solutions or most feasible remedies for utilization stabilizing products terms their dose rates has become a concern major civil engineering design projects. Using response surface methodology, this primarily focused on investigating optimal levels reinforcement fiber length (FL), dosage (FD), and curing time (CT) geotechnical parameters...