This self repair system is based upon harmless ground borne bacteria as the self-healing agent.The bacteria are activated after the concrete is cracked and the bacterial spores are exposed to moisture and air.The bact...This self repair system is based upon harmless ground borne bacteria as the self-healing agent.The bacteria are activated after the concrete is cracked and the bacterial spores are exposed to moisture and air.The bacterial reproduction process creates a calcite by-product which fills the cracks in the concrete.By sealing the cracks in concrete,an effective barrier to air or liquid borne deleterious materials are formed and as a consequence of this,enhanced durability is achieved in the structure,result-ing in lower life cycle costs.The concrete/mortar prisms were cracked and tested for water flow.They were then left for 56 days to heal and were subject to a test for water tightness.Healing was observed and a reduced water flow(74%and 32%healed)measured with the healed samples when compared to the specimens that were cracked and subjected to a water flow test without any healing agent.The number of samples were limited and a larger scale test is recommended for further work;however,this is a proof of concept of the process of healing and testing.展开更多
This paper examines the thermal performance of 20 different mortar mixes,which were prepared in order to study the behaviour of mortar incorporating Phase Change Materials(PCM).The PCM was used at a rate of 10,20 and ...This paper examines the thermal performance of 20 different mortar mixes,which were prepared in order to study the behaviour of mortar incorporating Phase Change Materials(PCM).The PCM was used at a rate of 10,20 and 30%by weight of total solid materials.Silica fume was added to the mixes by 10,20,30 and 50%by weight of cement to enhance the mortar properties.Mortars which incorporate phase-change materials(PCM)have the capability to help regulate the temperature inside buildings,contributing to the thermal comfort while decreasing the amount of mechanical heating and cooling energy required,therefore they have the potential to reduce building carbon emissions.The mechanical characteristics and physical properties of the mortar with PCM were studied.The results show that mortar with Phase Change Materials up to PCM20%can be used with an optimal compressive strength.Silica fume(SF),up to a 20%SF addition,enhanced the mechanical properties of the mortar.展开更多
文摘This self repair system is based upon harmless ground borne bacteria as the self-healing agent.The bacteria are activated after the concrete is cracked and the bacterial spores are exposed to moisture and air.The bacterial reproduction process creates a calcite by-product which fills the cracks in the concrete.By sealing the cracks in concrete,an effective barrier to air or liquid borne deleterious materials are formed and as a consequence of this,enhanced durability is achieved in the structure,result-ing in lower life cycle costs.The concrete/mortar prisms were cracked and tested for water flow.They were then left for 56 days to heal and were subject to a test for water tightness.Healing was observed and a reduced water flow(74%and 32%healed)measured with the healed samples when compared to the specimens that were cracked and subjected to a water flow test without any healing agent.The number of samples were limited and a larger scale test is recommended for further work;however,this is a proof of concept of the process of healing and testing.
文摘This paper examines the thermal performance of 20 different mortar mixes,which were prepared in order to study the behaviour of mortar incorporating Phase Change Materials(PCM).The PCM was used at a rate of 10,20 and 30%by weight of total solid materials.Silica fume was added to the mixes by 10,20,30 and 50%by weight of cement to enhance the mortar properties.Mortars which incorporate phase-change materials(PCM)have the capability to help regulate the temperature inside buildings,contributing to the thermal comfort while decreasing the amount of mechanical heating and cooling energy required,therefore they have the potential to reduce building carbon emissions.The mechanical characteristics and physical properties of the mortar with PCM were studied.The results show that mortar with Phase Change Materials up to PCM20%can be used with an optimal compressive strength.Silica fume(SF),up to a 20%SF addition,enhanced the mechanical properties of the mortar.
