The purpose of this study is to analyze the behavior of mortars from the sands of Togo in order to optimize their traction resistance. 3660 4 cm × 4 cm × 16 cm test tubes of mortars are prepared from the san...The purpose of this study is to analyze the behavior of mortars from the sands of Togo in order to optimize their traction resistance. 3660 4 cm × 4 cm × 16 cm test tubes of mortars are prepared from the sands of 20 extraction sites in Togo with variations in water and cement while keeping the water-cement ratio constant (<i>E</i>/<i>C</i> = 0.5). It emerges a quadratically increasing evolution of resistance in flexural at 28 days of age (<i>σ<sub>f</sub></i>) for cement-sand (<i>C</i>/<i>S</i>) and water-sand (<i>E</i>/<i>S</i>) ratios varying respectively by the interval [0.0370, 0.3580] to [0.1977, 0.5120] and [0.0185, 0.1792] to [0.0988, 0.2605]. The resistances become stationary beyond these values (<i>σ<sub>f</sub></i> ≈ 3.4750 MPa to 7.9010 MPa). For structures whose resistance in traction is desired, three formulas of sand mortars from Togo are therefore defined: rich mortars (<i>C</i>/<i>S</i> > 0.5120 and <i>E</i>/<i>S</i> > 0.2605), lean (<i>C</i>/<i>S</i> < 0.0370 and <i>E</i>/<i>S</i> < 0.0185) and normal (0.0370 < <i>C</i>/<i>S</i> < 0.5120 and 0.0185 < <i>E</i>/<i>S</i> < 0.2605).展开更多
The present study aims at helping to search for preventive solutions to pathologies of constructions in Togblécopé in Togo, by the reduction in the withdrawal and swelling of foundation grounds through their...The present study aims at helping to search for preventive solutions to pathologies of constructions in Togblécopé in Togo, by the reduction in the withdrawal and swelling of foundation grounds through their stabilization. Togblécopé’s clay taken from 1 m, 2 m and 3 m deep, and mixed with four binding materials (cement, sea sand, silty sand and lime). Tests of identification and free swelling with odometer are carried out on pure and stabilized materials. What emerges from these tests is that the limits of liquidity and plasticity are rising along with the rate of stabilizers while the index of plasticity is falling. Cement and lime cause a reduction in the index value of plasticity by almost 50%. The more the sand’s grain size, the more the reduction in the plasticity index. The swelling potential is reduced by 60% for cement and lime, 30% for sea sand and 20% for silty sand. The present study is a contribution to the reduction in deflations from 20% to 60% of some parts of constructions in order to limit cracks.展开更多
文摘The purpose of this study is to analyze the behavior of mortars from the sands of Togo in order to optimize their traction resistance. 3660 4 cm × 4 cm × 16 cm test tubes of mortars are prepared from the sands of 20 extraction sites in Togo with variations in water and cement while keeping the water-cement ratio constant (<i>E</i>/<i>C</i> = 0.5). It emerges a quadratically increasing evolution of resistance in flexural at 28 days of age (<i>σ<sub>f</sub></i>) for cement-sand (<i>C</i>/<i>S</i>) and water-sand (<i>E</i>/<i>S</i>) ratios varying respectively by the interval [0.0370, 0.3580] to [0.1977, 0.5120] and [0.0185, 0.1792] to [0.0988, 0.2605]. The resistances become stationary beyond these values (<i>σ<sub>f</sub></i> ≈ 3.4750 MPa to 7.9010 MPa). For structures whose resistance in traction is desired, three formulas of sand mortars from Togo are therefore defined: rich mortars (<i>C</i>/<i>S</i> > 0.5120 and <i>E</i>/<i>S</i> > 0.2605), lean (<i>C</i>/<i>S</i> < 0.0370 and <i>E</i>/<i>S</i> < 0.0185) and normal (0.0370 < <i>C</i>/<i>S</i> < 0.5120 and 0.0185 < <i>E</i>/<i>S</i> < 0.2605).
文摘The present study aims at helping to search for preventive solutions to pathologies of constructions in Togblécopé in Togo, by the reduction in the withdrawal and swelling of foundation grounds through their stabilization. Togblécopé’s clay taken from 1 m, 2 m and 3 m deep, and mixed with four binding materials (cement, sea sand, silty sand and lime). Tests of identification and free swelling with odometer are carried out on pure and stabilized materials. What emerges from these tests is that the limits of liquidity and plasticity are rising along with the rate of stabilizers while the index of plasticity is falling. Cement and lime cause a reduction in the index value of plasticity by almost 50%. The more the sand’s grain size, the more the reduction in the plasticity index. The swelling potential is reduced by 60% for cement and lime, 30% for sea sand and 20% for silty sand. The present study is a contribution to the reduction in deflations from 20% to 60% of some parts of constructions in order to limit cracks.
