The objective of this study is to seek solutions to reduce the impact of buildings on climate change and to promote the use of local bio-sourced or geo-sourced materials for sustainable construction. Different samples...The objective of this study is to seek solutions to reduce the impact of buildings on climate change and to promote the use of local bio-sourced or geo-sourced materials for sustainable construction. Different samples of raw earth from 3 sites were taken in the commune of Mlomp. Geotechnical tests showed that the raw earth samples from sites 2 and 3 have more clay fraction while site 1 contains more sand. The fact of integrating fibers from crushed palm leaves (Borassus aethiopum) (2%, 4% and 6%) into the 3 raw earth samples reduced the mechanical resistance to compression and traction of the 3 raw earths. The experimental results of thermal tests on samples of earth mixtures with crushed Palma leaf fibers show a decrease in thermal conductivity as well as thermal effusivity as the percentages increase (2%, 4% and 6%) of fibers in raw earth for the 3 sites. This shows that this renewable composite material can help improve the thermal insulation of building envelopes.展开更多
The housing sector today uses elaborate materials such as cement,iron,sand,often prohibitively expensive and whose production generates a strong environmental impact(scarcity of resources,transport,greenhouse gas gree...The housing sector today uses elaborate materials such as cement,iron,sand,often prohibitively expensive and whose production generates a strong environmental impact(scarcity of resources,transport,greenhouse gas greenhouse,etc.).In order to meet the challenges of sustainable development,earth construction is experiencing a resurgence of interest these days.Despite its many advantages,raw earth material has drawbacks,in particular its low mechanical resistance and its loss of geometric characteristics in the face of water,which slow down its development.As part of this study,the mechanical characteristics and durability of raw earth were improved by using residual water from the processing of Parkia Biglobosa(nere)and Vitellaria Paradoxa(shea)nuts in order to optimize its use for the construction of modern buildings.To this end,the decoctions resulting from the artisanal transformation of the nut of the Parkia Biglobosa into African mustard and of the Vitellaria Paradoxa into shea butter were added to the raw earth according to volume proportions of 25%,50%,75%and 100%of the aqueous solution to obtain the projected composites.Thus,mechanical characterization and durability tests were carried out on the composites obtained.The results revealed that the decoctions of Vitellaria Paradoxa and Parkia Biglobosa improve the compressive strength of the material by up to 90%and 260%,respectively.Furthermore,these decoctions improved the resistance to water penetration of the 100%additive composite by 1.5 times for Vitellaria Paradoxa and 5 times for Parkia Biglobosa.This study shows that it is possible to use decoctions as raw earth stabilizers to build modern,ecological buildings at lower energy costs.However,more in-depth studies on surface wettability and long-term durability are planned to better characterize the geomaterial.展开更多
Building construction using cement bricks on the one hand,and mud bricks on the other hand,presents problems of resistance and durability in the face of natural weathering in our country(Republic of Guinea).These diff...Building construction using cement bricks on the one hand,and mud bricks on the other hand,presents problems of resistance and durability in the face of natural weathering in our country(Republic of Guinea).These difficulties could be linked to non-compliance with standards and the failure to master certain physico-chemical,mechanical and technical parameters when constructing a building.In order to remedy this problem,a series of studies were carried out on samples of mud bricks used in the construction of century-old straw hut buildings in the urban commune of Kouroussa(Republic of Guinea).To this end,the compressive strength of the brick samples was assessed either:0.10 MPa,and sensory techniques of certain characteristics were carried out to evaluate the cohesion of the elements in the brick samples,such as:coward boule technique,hand washing test,withdrawal of a soil(pellet or ring test)and of the jar test.The physico-chemical analyses methods were carried out using XRF(X-Ray Fluorescence Spectrometry),granulometry and Atterberg limits in accordance with NF P 94-051.These results showed a high insoluble residue content(49.9%)and the sample had a clay-like appearance with a low PI(Plasticity Index)=8%.This study could be an alternative guide for the authorities in charge of housing and construction in the Kouroussa prefecture(Republic of Guinea).because,the majority of houses in Upper Guinea are built with mud raw bricks or fired bricks.展开更多
文摘The objective of this study is to seek solutions to reduce the impact of buildings on climate change and to promote the use of local bio-sourced or geo-sourced materials for sustainable construction. Different samples of raw earth from 3 sites were taken in the commune of Mlomp. Geotechnical tests showed that the raw earth samples from sites 2 and 3 have more clay fraction while site 1 contains more sand. The fact of integrating fibers from crushed palm leaves (Borassus aethiopum) (2%, 4% and 6%) into the 3 raw earth samples reduced the mechanical resistance to compression and traction of the 3 raw earths. The experimental results of thermal tests on samples of earth mixtures with crushed Palma leaf fibers show a decrease in thermal conductivity as well as thermal effusivity as the percentages increase (2%, 4% and 6%) of fibers in raw earth for the 3 sites. This shows that this renewable composite material can help improve the thermal insulation of building envelopes.
基金supported by the Beninese state.An author received a trainer training grant from the Benin state for stays in the Jean Lamour Institute Laboratory of the University of Lorraine in France to carry out tests.
文摘The housing sector today uses elaborate materials such as cement,iron,sand,often prohibitively expensive and whose production generates a strong environmental impact(scarcity of resources,transport,greenhouse gas greenhouse,etc.).In order to meet the challenges of sustainable development,earth construction is experiencing a resurgence of interest these days.Despite its many advantages,raw earth material has drawbacks,in particular its low mechanical resistance and its loss of geometric characteristics in the face of water,which slow down its development.As part of this study,the mechanical characteristics and durability of raw earth were improved by using residual water from the processing of Parkia Biglobosa(nere)and Vitellaria Paradoxa(shea)nuts in order to optimize its use for the construction of modern buildings.To this end,the decoctions resulting from the artisanal transformation of the nut of the Parkia Biglobosa into African mustard and of the Vitellaria Paradoxa into shea butter were added to the raw earth according to volume proportions of 25%,50%,75%and 100%of the aqueous solution to obtain the projected composites.Thus,mechanical characterization and durability tests were carried out on the composites obtained.The results revealed that the decoctions of Vitellaria Paradoxa and Parkia Biglobosa improve the compressive strength of the material by up to 90%and 260%,respectively.Furthermore,these decoctions improved the resistance to water penetration of the 100%additive composite by 1.5 times for Vitellaria Paradoxa and 5 times for Parkia Biglobosa.This study shows that it is possible to use decoctions as raw earth stabilizers to build modern,ecological buildings at lower energy costs.However,more in-depth studies on surface wettability and long-term durability are planned to better characterize the geomaterial.
文摘Building construction using cement bricks on the one hand,and mud bricks on the other hand,presents problems of resistance and durability in the face of natural weathering in our country(Republic of Guinea).These difficulties could be linked to non-compliance with standards and the failure to master certain physico-chemical,mechanical and technical parameters when constructing a building.In order to remedy this problem,a series of studies were carried out on samples of mud bricks used in the construction of century-old straw hut buildings in the urban commune of Kouroussa(Republic of Guinea).To this end,the compressive strength of the brick samples was assessed either:0.10 MPa,and sensory techniques of certain characteristics were carried out to evaluate the cohesion of the elements in the brick samples,such as:coward boule technique,hand washing test,withdrawal of a soil(pellet or ring test)and of the jar test.The physico-chemical analyses methods were carried out using XRF(X-Ray Fluorescence Spectrometry),granulometry and Atterberg limits in accordance with NF P 94-051.These results showed a high insoluble residue content(49.9%)and the sample had a clay-like appearance with a low PI(Plasticity Index)=8%.This study could be an alternative guide for the authorities in charge of housing and construction in the Kouroussa prefecture(Republic of Guinea).because,the majority of houses in Upper Guinea are built with mud raw bricks or fired bricks.
