The disorders caused by the swelling of the soil on the structures have been observed for several years in the city of Rufisque. This article presents the results of the study of swelling kinetics of expansive soils i...The disorders caused by the swelling of the soil on the structures have been observed for several years in the city of Rufisque. This article presents the results of the study of swelling kinetics of expansive soils in Rufisque and their prediction based on the hyperbolic rule. The odometer is used as an instrument for measuring swelling and the tests are carried out on some intact samples at their sampling water content. The present study shows that in Rufisque the most swelling layer is marl. The results show two phases of development. The first phase is very fast and represents 77% of the final deformation and the second one is slower. The prediction of the issue by the hyperbolic rule shows that it underestimates the first phase but gives a good prediction of the second phase of the swelling rate. There is a good correlation between the final swelling rates. However, the model gives a bad approximation of the half-swelling time.展开更多
The study of the performance of raw clay bricks has made it possible to develop laterite in Eco village construction projects.Identification tests(particle size analysis,Atterberg limits,Proctor,shrinkage limit,and sa...The study of the performance of raw clay bricks has made it possible to develop laterite in Eco village construction projects.Identification tests(particle size analysis,Atterberg limits,Proctor,shrinkage limit,and sand equivalent)made it possible to characterize the laterite,the sand,and the E1 mixture(70%laterite and 30%sand).By adding binders to E1,three other types of mixtures E2,E3,and E4 have been proposed.The improved E1 sample:(1)At 2.5%of cement gives E2;(2)At 10%of lime gives E3;(3)with 0.8%lignosulfonates.After making the bricks using the samples E1,E2,E3,and E4,we perform uniform compression test at 3,7,and 21 days.All samples have simple compressive strengths greater than 0.5 MPa(in accordance with standard NF EN 771-1)after 3 days.Their evolution from 0.5 to 2.5 MPa,between 3 and 7 days,shows a jump of 1.5.From 7 to 21 days the evolution curve of the Rc shows a slight ascension then a plateau pace(2.5,2.51,2.56 MPa).From these results,we concluded that they were used according to the area and the type of climate.The use of the sample E1 is proposed in arid zones or with low rainfall,the sample E2,and E3 in the rainy zones without risk of capillary rise and the sample E4 in the rainy zones with the risk of capillary rise.展开更多
文摘The disorders caused by the swelling of the soil on the structures have been observed for several years in the city of Rufisque. This article presents the results of the study of swelling kinetics of expansive soils in Rufisque and their prediction based on the hyperbolic rule. The odometer is used as an instrument for measuring swelling and the tests are carried out on some intact samples at their sampling water content. The present study shows that in Rufisque the most swelling layer is marl. The results show two phases of development. The first phase is very fast and represents 77% of the final deformation and the second one is slower. The prediction of the issue by the hyperbolic rule shows that it underestimates the first phase but gives a good prediction of the second phase of the swelling rate. There is a good correlation between the final swelling rates. However, the model gives a bad approximation of the half-swelling time.
文摘The study of the performance of raw clay bricks has made it possible to develop laterite in Eco village construction projects.Identification tests(particle size analysis,Atterberg limits,Proctor,shrinkage limit,and sand equivalent)made it possible to characterize the laterite,the sand,and the E1 mixture(70%laterite and 30%sand).By adding binders to E1,three other types of mixtures E2,E3,and E4 have been proposed.The improved E1 sample:(1)At 2.5%of cement gives E2;(2)At 10%of lime gives E3;(3)with 0.8%lignosulfonates.After making the bricks using the samples E1,E2,E3,and E4,we perform uniform compression test at 3,7,and 21 days.All samples have simple compressive strengths greater than 0.5 MPa(in accordance with standard NF EN 771-1)after 3 days.Their evolution from 0.5 to 2.5 MPa,between 3 and 7 days,shows a jump of 1.5.From 7 to 21 days the evolution curve of the Rc shows a slight ascension then a plateau pace(2.5,2.51,2.56 MPa).From these results,we concluded that they were used according to the area and the type of climate.The use of the sample E1 is proposed in arid zones or with low rainfall,the sample E2,and E3 in the rainy zones without risk of capillary rise and the sample E4 in the rainy zones with the risk of capillary rise.
