The Experts below are selected from a list of 222 Experts worldwide ranked by ideXlab platform
Mohsen Farzi - One of the best experts on this subject based on the ideXlab platform.
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comparison of the effect of mixing methods Dry vs wet on mechanical and hydraulic properties of treated soil with Cement or lime
Applied Clay Science, 2015Co-Authors: Mohammad S Pakbaz, Mohsen FarziAbstract:Abstract Where difficult foundation soils are encountered in civil engineering projects, deep soil mixing method is a choice as a solution to deal with the problem. In this soil improvement method, Cement or lime in slurry form (wet method) or in Dry powder (Dry method) is mixed with the in situ soil. To the knowledge of the authors no comparison between Cement and lime treated soil using wet or Dry method has been made for saturated soils. In this research saturated bentonite-sand mixtures were treated with 2, 4, 6, 8 and 10% by Dry mass of Cement, lime and Cement–lime using both wet and Dry methods. Treated soil samples after curing periods of 7, 14 and 28-days were tested in unconfined compression strength and consolidation. The results of unconfined compression tests indicated that the strength of wet Cement treated samples was higher than Dry Cement treated samples and this was opposite for lime treated samples. The results of consolidation tests in terms of the e–logσ v ′ relationship indicated that they were in general, function of the type and the amount of the admixture and the curing time. Compression index decreased with amount of additive in contrast with previous finding for Cement treated samples of a low plastic clay soil. Lime treated samples showed higher elastic modulus than Cement treated samples and Dry treated samples in general showed higher elastic modulus than wet treated samples.
O. V. Ekechukwu - One of the best experts on this subject based on the ideXlab platform.
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Benchmarking energy utilization in Cement manufacturing processes in Nigeria and estimation of savings opportunities
Clean Technologies and Environmental Policy, 2017Co-Authors: Howard O. Njoku, Oluwafemi R. Bafuwa, Chigbo A. Mgbemene, O. V. EkechukwuAbstract:Nigeria is a leading producer of Cement in Africa. Because Cement production is energy intensive, with significant adverse impacts on the environment, an apparent need exists to assess the Nigerian Cement industry to identify energy use mitigation options. The potentials for reducing energy use in typical Nigerian Cement manufacturing plants, through the implementation of available energy efficiency measures, were assessed in this study, alongside the attendant costs of implementing those measures. To achieve these, using numerous globally available energy efficiency technologies and measures, energy conservation supply curves were constructed for three Nigerian Cement manufacturing plants which operate on wet, semi-wet, and Dry Cement manufacturing processes, respectively. Comparisons with global best and Chinese benchmark plants with respect to thermal and electrical energy consumption were also made. The comparisons showed that, with respect to the global benchmark plants, thermal energy savings of between 19.83 and 52%, and electrical energy savings of between 35.23 and 43.10%, were possible. With respect to the Chinese benchmarks, thermal energy savings of 10.74–47.32%, and electrical energy savings of 20.95–30.17%, could be achieved. The plants considered performed significantly less than either of the benchmarks in terms of both thermal and electrical energy usage. The energy conservation supply curves for the plants showed that implementing the cost-effective energy efficiency measures could lead to energy savings of about 235,038, 237,913 and 374,055 GJ/year, for the wet, semi-wet, and Dry Cement manufacturing plants, respectively. Furthermore, technically feasible efficiency measures could yield energy savings of about 250,272, 259,795 and 395,447 GJ/year, respectively. Achieving these savings will improve profitability in the Nigerian Cement industry and make the unused energies available for utilization in other sectors of the Nigerian economy.
Mohammad S Pakbaz - One of the best experts on this subject based on the ideXlab platform.
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comparison of the effect of mixing methods Dry vs wet on mechanical and hydraulic properties of treated soil with Cement or lime
Applied Clay Science, 2015Co-Authors: Mohammad S Pakbaz, Mohsen FarziAbstract:Abstract Where difficult foundation soils are encountered in civil engineering projects, deep soil mixing method is a choice as a solution to deal with the problem. In this soil improvement method, Cement or lime in slurry form (wet method) or in Dry powder (Dry method) is mixed with the in situ soil. To the knowledge of the authors no comparison between Cement and lime treated soil using wet or Dry method has been made for saturated soils. In this research saturated bentonite-sand mixtures were treated with 2, 4, 6, 8 and 10% by Dry mass of Cement, lime and Cement–lime using both wet and Dry methods. Treated soil samples after curing periods of 7, 14 and 28-days were tested in unconfined compression strength and consolidation. The results of unconfined compression tests indicated that the strength of wet Cement treated samples was higher than Dry Cement treated samples and this was opposite for lime treated samples. The results of consolidation tests in terms of the e–logσ v ′ relationship indicated that they were in general, function of the type and the amount of the admixture and the curing time. Compression index decreased with amount of additive in contrast with previous finding for Cement treated samples of a low plastic clay soil. Lime treated samples showed higher elastic modulus than Cement treated samples and Dry treated samples in general showed higher elastic modulus than wet treated samples.
Mohamed Boutouil - One of the best experts on this subject based on the ideXlab platform.
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Geotechnical properties of dredged marine sediments treated at high water/Cement ratio
Geo-Marine Letters, 2009Co-Authors: Boubaker Rekik, Mohamed BoutouilAbstract:Cement and lime are widely employed in soil and sediment treatment for an improvement of geotechnical properties, such as an increase in mechanical strength which enables beneficial use in various geotechnical applications. In this study, fine organic-rich dredged harbour sediments of 120% relative water content were treated with Dry Cement at contents varying between 2% and 10% of bulk sediment wet weight. Tests based on assessments of one-dimensional compression and Atterberg limits were performed on untreated and Cement-treated sediments for various curing periods, as well as grain-size, SEM and X-ray diffraction analyses. The results confirm that increasing the Cement content improves the geotechnical properties of these harbour sediments. Already in the early phase of curing (first 3 days of curing), particle size increases while sediment plasticity decreases. Changes in the compressibility behaviour include an increase in apparent preconsolidation pressure, in the compression index C _c and in the primary consolidation coefficient C _v, and a decrease in the secondary compression index $$ C_\alpha $$ . This means that the new materials are characterized by a behaviour intermediate between that of fine and that of coarser soils.
Sang Jia-gong - One of the best experts on this subject based on the ideXlab platform.
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Discussion About Dry Cement Jet Mixing Piles in Dealing With Soft Foundation
Journal of Heilongjiang Institute of Technology, 2002Co-Authors: Sang Jia-gongAbstract:This paper firstly recapitulates the reinforcing principles of Dry Cement Jet Mixing Piles in dealing with soft foundation,then discusses the feasibility of several projects.It also analyses and summarizes the problem of Dry jet Mixing Piles in engineering practice.Finally variable dose of Cement is also researched.
