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Evaluation of rice husk ash and Portland cement reinforced clay for use as road subgrade using the CBR test

Journal of Bioresources and Bioproducts 2018年第2期3卷 65-70页

作者： Nneka Juliana Ogbuagu emmanuel amagu echiegu Uche Jenice Chiwetalu Department of Agricultural and Bioresource Engineering Enugu State University of Science and TechnologyEnuguNigeria Department of Agricultural and Bioresource Engineering University of Nigeria NsukkaNigeria.

The amount of rice husk waste generated in Nigeria is posing serious threat to the environment and the *** these wastes for productive purposes has been of interest to government and *** study evaluated rice hush ash(RHA)reinforced clay for use as road subgrade,using the California Bearing Ratio(CBR)as prescribed in ASTM *** clay was mixed with RHA/Portland cement in the ratios of 0%(control),2.5%,5%,7.5%and 10%.Results showed that the physical properties of the soil in its natural form did not meet the FMW&H guideline specification for subgrade road;thus there was a need to stabilize the *** the percentage of RHA increased,the strength of the soil increased,with the maximum strength observed at 5%RHA,beyond which there was decrease in the load bearing capacity of the *** CBR ratio of 9.35%was obtained at 5%RHA,5%Portland cement and 90%clay *** this result with the soil at natural state(CBR=1.55%),it shows that RHA is a good improvement agent for the *** research can be beneficial to highway road construction in areas with similar soil conditions.

关键词： Soil Stabilization Rice husk ash CBR Atterberg limit

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Influence of automobile industrial wastewater on soil quality

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International Journal of Agricultural and Biological Engineering 2014年第6期7卷 123-128页

作者： Ugwu Samson Nnaemeka Anyadike Chinenye Chukwuemeka echiegu emmanuel Nwoke Oji Achuka Ugwuishiwu Boniface Department of Agricultural and Bioresources Engineering University of NigeriaNsukkaNigeria

Reuse of industrial wastewater(effluent)for irrigation purpose is a common ***,lack of adequate treatment of the effluent can cause soil deterioration,vegetation destruction and contamination of the aquatic *** adverse effects necessitated the study of wastewater irrigation in Emene Industrial Layout,Enugu State,*** and soil samples were collected,analyzed and subjected to Analysis of Variance(ANOVA)for Completely Randomized Design(CRD)at 5% probability level using GENSTAT *** results obtained from the study were compared with FAO soil and water *** wastewater analysis suggested that contamination at the untreated stage was very high and results at the treatment level were within the FAO reuse *** study also found wide variation in chemical status of industrial wastewater treated *** all the values for the wastewater treated soil were not within the FAO irrigated soil chemical properties *** suggests high re-contamination along the open channel(from non-point sources)before *** calls for proper monitoring and treatment of the industrial effluent prior to irrigation application.

关键词： irrigation soil quality contamination wastewater automobile industry

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