Tropical clay soil was compacted at different moisture conditions (dry, wet and optimum) and compactive efforts (Reduced proctor, Standard proctor, West African standard and Modified proctor). Experimental Soil-Water ...Tropical clay soil was compacted at different moisture conditions (dry, wet and optimum) and compactive efforts (Reduced proctor, Standard proctor, West African standard and Modified proctor). Experimental Soil-Water Characteristics (SWC) of the soil was derived using the pressure plate extractor equipment and SWC Curves (SWCC) plotted as gravimetric water content versus logarithm of matric suction. The Air Entry Values (A.E.V) obtained from experimental work ranged from 21 kPa to 59 kPa and compared favourably well with those estimated from predictive models with values of 23 kPa to 52 kPa. Specimens compacted with greater compactive effort (Modified proctor) and at optimum moisture content produced the largest air entry value of 59 kPa and reduced air voids. Changes observed in the shape of the SWCC were consistent with changes in pore size which occurred by varying compaction conditions. The shape of the soil-water characteristics curve was found to depend on the soil structure, compactive water content and compactive effort and not solely on the percentage of fine particles.展开更多
com-pacted MSW increases the placement efficiency and thus reduces the space requirement for landfills.The composition of MSW,degradation,and compactive efforts are the key factors that control the compaction characte...com-pacted MSW increases the placement efficiency and thus reduces the space requirement for landfills.The composition of MSW,degradation,and compactive efforts are the key factors that control the compaction characteristics of MSW.This paper presents the laboratory investigation of compaction characteristics of fresh and aged MSW at a wide range of compactive efforts.Fresh MSW(S_(1)),Windrows sample(S_(2))of an age of 2 months,5-year-old MSW(S_(3)),10-year-old MSW(S_(4)),and 15-year-old MSW(S_(5))were collected from the working phase of the solid waste management site,Vilholi Nasik,(MH)India.Compaction was carried in 1000 mL capacity mold under four different energy levels,i.e.,552(E_(1)),1125(E_(2)),2682(E_(3)),and 5364(E4)kJ/m^(3).The results showed that the maximum dry density(γ_(dmax))was observed less in the S_(1)sample at the standard compactive effort.As the age of the sample increase from fresh to 5 years,γ_(dmax)was more with lesser optimum moisture content(w_(opt))because of the completion of the biodegradation process.No further change in compaction characteristics was observed once the biodegradation process was finished.The study shows that the particle size of MSW gets reduced as the age of the sample increased.This reduces the particle size of MSW is one of the contributing factors to increasingγ_(dmax).When compactive energy is changed from E_(1)to E4 theγ_(dmax)increased and w_(opt)decreased for all the samples.A normalized w_(opt)and compaction energy correlation is proposed in this study.The correlation can get compaction characteristics of fresh and aged MSW at any compactive effort.展开更多
文摘Tropical clay soil was compacted at different moisture conditions (dry, wet and optimum) and compactive efforts (Reduced proctor, Standard proctor, West African standard and Modified proctor). Experimental Soil-Water Characteristics (SWC) of the soil was derived using the pressure plate extractor equipment and SWC Curves (SWCC) plotted as gravimetric water content versus logarithm of matric suction. The Air Entry Values (A.E.V) obtained from experimental work ranged from 21 kPa to 59 kPa and compared favourably well with those estimated from predictive models with values of 23 kPa to 52 kPa. Specimens compacted with greater compactive effort (Modified proctor) and at optimum moisture content produced the largest air entry value of 59 kPa and reduced air voids. Changes observed in the shape of the SWCC were consistent with changes in pore size which occurred by varying compaction conditions. The shape of the soil-water characteristics curve was found to depend on the soil structure, compactive water content and compactive effort and not solely on the percentage of fine particles.
文摘com-pacted MSW increases the placement efficiency and thus reduces the space requirement for landfills.The composition of MSW,degradation,and compactive efforts are the key factors that control the compaction characteristics of MSW.This paper presents the laboratory investigation of compaction characteristics of fresh and aged MSW at a wide range of compactive efforts.Fresh MSW(S_(1)),Windrows sample(S_(2))of an age of 2 months,5-year-old MSW(S_(3)),10-year-old MSW(S_(4)),and 15-year-old MSW(S_(5))were collected from the working phase of the solid waste management site,Vilholi Nasik,(MH)India.Compaction was carried in 1000 mL capacity mold under four different energy levels,i.e.,552(E_(1)),1125(E_(2)),2682(E_(3)),and 5364(E4)kJ/m^(3).The results showed that the maximum dry density(γ_(dmax))was observed less in the S_(1)sample at the standard compactive effort.As the age of the sample increase from fresh to 5 years,γ_(dmax)was more with lesser optimum moisture content(w_(opt))because of the completion of the biodegradation process.No further change in compaction characteristics was observed once the biodegradation process was finished.The study shows that the particle size of MSW gets reduced as the age of the sample increased.This reduces the particle size of MSW is one of the contributing factors to increasingγ_(dmax).When compactive energy is changed from E_(1)to E4 theγ_(dmax)increased and w_(opt)decreased for all the samples.A normalized w_(opt)and compaction energy correlation is proposed in this study.The correlation can get compaction characteristics of fresh and aged MSW at any compactive effort.
