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Biogeotechnics 2023年第4期1卷 13-27页

作者： Kaniz Roksana Shaini Aluthgun Hewage melissa montalbo lomboy Chaosheng Tang Wei Xue Cheng Zhu Department of Civil and Environmental Engineering Rowan UniversityGlassboroNJ 08028USA Experiential Engineering Education(ExEEd) Rowan UniversityGlassboroNJ 08028USA School of Earth Sciences and Engineering Nanjing UniversityNanjing 210046China Department of Mechanical Engineering Rowan UniversityGlassboroNJ 08028USA

The effects of desiccation cracking in clay soils on geotechnical constructions are *** study investigates the viability of utilizing Enzyme-induced calcite precipitation(EICP),a bio inspired approach,as a potential solution for addressing desiccation cracking in fine-grain *** the EICP technique,crude soybean extract is employed for the purpose of urea *** fluid samples,including a control sample,a cementation solution containing 1 M urea,0.675 M CaCl_(2),and 4 g/L milk,along with various concentrations of enzyme solutions(3-80 g/L),were tested for the *** evaluate the surface cracking patterns,the method involved constant monitoring and photo recording using a high-resolution camera aided by image processing *** results showed that fine-grain soils improved from increased calcite precipitation and decreased desiccation cracking intensity when the EICP method was *** and enzyme solution with low concentrations(3 g/L and 10 g/L)had similar effects on crack remediation,suggesting a modest *** contrast to the sample treated with water,the crack network remained unaltered in this ***3 precipitation within the void area kept the crack network in place even as the void thickness decreased at increasing enzyme concentrations(30 g/L,50 g/L,and 80 g/L).Wetting and drying cycles were found to decrease the crack ratio,crack width,and crack length in the EICP-treated sample,particularly under higher concentrations of urease *** enzyme concentrations of 3 g/L and 10 g/L have minimal impact on crack remediation but effectively inhibit new crack ***,higher enzyme concentrations result in calcium carbonate precipitates,forming a soil crust and increasing surface *** study aims to enhance understanding of the EICP methodology and to provide novel perspectives on potential uses for soil enhancement.

关键词： Desiccation crack Wetting-drying cycle Bio cementation Plant-based EICP

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Extended Use of Limestone Fines in Various Concretes

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Journal of Civil Engineering and Architecture 2016年第9期10卷 995-1005页

作者： Gilson R. lomboy Fatih Bektas Kejin Wang Department of Civil Construction and Environmental Engineering lowa State University Ames IA 50011 USA Institute for Transportation lowa State University Ames 1A 50010 USA

Limestone fines are increasingly used in cement and concrete for improved material properties and sustainability. This paper presents recent research at Iowa State University on utilization of limestone fines in concrete. It includes the beneficial uses of limestone fines in：（1） limestone blended Portland cement; （2） SFSCC （semi-flowable self-consolidating concrete）; and （3） HPC （high performance concrete）. The research results show that using 5%-10% of limestone fines to replace for Type IP cement （with 25% fly ash） increased mortar strength. Well-designed SFSCC with 25% limestone fines （by mass of cementitious materials） displayed desirable rheological and mechanical properties required for slip-forming construction. The newly developed limestone fines-based HPC reached the one-day compressive strength of over 28 MPa.

关键词：流态自密实混凝土石灰石粉应用高性能混凝土波特兰水泥细粉材料质量可持续性

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