This paper will discuss experiments using various forming systems combined with utilizing mechanical equipment,from cement mixers to excavators and skid steers with attachments,to accelerate construction of cob homes ...This paper will discuss experiments using various forming systems combined with utilizing mechanical equipment,from cement mixers to excavators and skid steers with attachments,to accelerate construction of cob homes and greatly reduce the labor involved.Cob is a colloquial term for monolithic adobe,and refers to a masonry building technique used since ancient times that uses locally-sourced clay as a binder,with various aggregates from sand to small grit or stone,woven together with straw or other fiber and built in continuous layers to form a monolithic structure.展开更多
Strength properties of laboratory scale lime-based samples enhanced with additives such as nanomaterials(nanofibrillated cellulose,nanosilica,nanoclay,expanded graphite),hemp&glass fibres,hemp shiv and polyvinyl a...Strength properties of laboratory scale lime-based samples enhanced with additives such as nanomaterials(nanofibrillated cellulose,nanosilica,nanoclay,expanded graphite),hemp&glass fibres,hemp shiv and polyvinyl acetate(PVAc)are determined.Samples were cured for 26 days in air at 20℃/60%RH after casting before being oven dried for a further two days at 50℃(28 days total).Results show that the nanomaterials on their own had a mixed effect on the strength although nSiO_(2) as a solo additive performed exceptionally well.The combination of fibres in conjunction with PVAc also greatly enhanced the strength due to increased bond between the fibres and the matrix.In addition,Greenhouse Gas emissions(GHG,kgCO_(2)eq)of an arbitrary block was determined for all composites and compared to the GHG of a commonly used lightweight aerated concrete block.Comparison of the normalised compressive strengths to the different loading conditions as outlined in BS EN 8103 shows that a more widespread use of pre-cast lime composites is possible and without unduly increasing GHG emissions.展开更多
文摘This paper will discuss experiments using various forming systems combined with utilizing mechanical equipment,from cement mixers to excavators and skid steers with attachments,to accelerate construction of cob homes and greatly reduce the labor involved.Cob is a colloquial term for monolithic adobe,and refers to a masonry building technique used since ancient times that uses locally-sourced clay as a binder,with various aggregates from sand to small grit or stone,woven together with straw or other fiber and built in continuous layers to form a monolithic structure.
基金supported by the Iraqi Ministry of Higher Education and Scientific Research and Iraqi Cultural Attache in London,who supported the research studies for F.J.Khalaf.
文摘Strength properties of laboratory scale lime-based samples enhanced with additives such as nanomaterials(nanofibrillated cellulose,nanosilica,nanoclay,expanded graphite),hemp&glass fibres,hemp shiv and polyvinyl acetate(PVAc)are determined.Samples were cured for 26 days in air at 20℃/60%RH after casting before being oven dried for a further two days at 50℃(28 days total).Results show that the nanomaterials on their own had a mixed effect on the strength although nSiO_(2) as a solo additive performed exceptionally well.The combination of fibres in conjunction with PVAc also greatly enhanced the strength due to increased bond between the fibres and the matrix.In addition,Greenhouse Gas emissions(GHG,kgCO_(2)eq)of an arbitrary block was determined for all composites and compared to the GHG of a commonly used lightweight aerated concrete block.Comparison of the normalised compressive strengths to the different loading conditions as outlined in BS EN 8103 shows that a more widespread use of pre-cast lime composites is possible and without unduly increasing GHG emissions.
