This research aimed to clarify the role of by-product materials, such as CKD with SF as partial replacement by weight of cement in concrete manufacturing and inclusion on different characteristics of concrete. Concret...This research aimed to clarify the role of by-product materials, such as CKD with SF as partial replacement by weight of cement in concrete manufacturing and inclusion on different characteristics of concrete. Concrete test specimens were mixed with 0%, 5%, 10%, 15%, 20% and 25% (CKD) with 15% (SF) as partial replacement by weight of Cement (CEM I-52.5N). Fresh concrete properties have been evaluated by workability measurement slump test. While hardened concrete properties have been evaluated by compressive, split tensile and flexural strengths tests at ages 7, 28 and 56 days, but evaluated for bond strength, modulus of elasticity and chemical composition measurement with X-Ray Fluorescence at age of 28 days. The test results have revealed that the increase of CKD amount with fixed amount of SF in concrete mixtures as partial replacement by weight of cement leads to gradual decrease of fresh concrete workability. In concrete mixtures, 20% CKD in the presence of 15% SF as partial replacement by the weight of cement are the optimum ratios which can be used without any negative effect on mechanical properties compressive, indirect tensile, flexural and bond strength at all the ages of concrete. Also modulus of elasticity and bond strength increased by 8.81% and 0.69% respectively at the age 28 days compared with control mixture.展开更多
A vast amount of construction and demolition(C&D)wastes are generated in Western Australia(WA)of which a major portion goes to landfills.The diversion of C&D waste from landfills would be the single most signi...A vast amount of construction and demolition(C&D)wastes are generated in Western Australia(WA)of which a major portion goes to landfills.The diversion of C&D waste from landfills would be the single most significant opportunity for WA to improve its recovery performance.C&D waste materials have already been investigated for their appropriateness and use in pavement and concrete.This work is the continuation of the authors’previous work involving further experimental tests to prove the structural suitability of a building’s structural member(i.e.,beam)made of recycled aggregates and industrial by-products.The concrete mixes considered in this study are 100NA+100 OPC(Control),100RA+100OPC,50RA+50NA+90OPC+10SF and 50RA+50NA+60OPC+30FA+10SF.The Reinforced Concrete(RC)beam made of 50RA+50NA+60OPC+30FA+10SF concrete mix was found to be the only eco-efficient option.This option has reduced the level of environmental impacts in a cost-competitive manner.The use of this eco-efficient option could also provide new employment opportunities and significant improvements in terms of land and energy resources conservation and bio-diversity enhancement.展开更多
文摘This research aimed to clarify the role of by-product materials, such as CKD with SF as partial replacement by weight of cement in concrete manufacturing and inclusion on different characteristics of concrete. Concrete test specimens were mixed with 0%, 5%, 10%, 15%, 20% and 25% (CKD) with 15% (SF) as partial replacement by weight of Cement (CEM I-52.5N). Fresh concrete properties have been evaluated by workability measurement slump test. While hardened concrete properties have been evaluated by compressive, split tensile and flexural strengths tests at ages 7, 28 and 56 days, but evaluated for bond strength, modulus of elasticity and chemical composition measurement with X-Ray Fluorescence at age of 28 days. The test results have revealed that the increase of CKD amount with fixed amount of SF in concrete mixtures as partial replacement by weight of cement leads to gradual decrease of fresh concrete workability. In concrete mixtures, 20% CKD in the presence of 15% SF as partial replacement by the weight of cement are the optimum ratios which can be used without any negative effect on mechanical properties compressive, indirect tensile, flexural and bond strength at all the ages of concrete. Also modulus of elasticity and bond strength increased by 8.81% and 0.69% respectively at the age 28 days compared with control mixture.
文摘A vast amount of construction and demolition(C&D)wastes are generated in Western Australia(WA)of which a major portion goes to landfills.The diversion of C&D waste from landfills would be the single most significant opportunity for WA to improve its recovery performance.C&D waste materials have already been investigated for their appropriateness and use in pavement and concrete.This work is the continuation of the authors’previous work involving further experimental tests to prove the structural suitability of a building’s structural member(i.e.,beam)made of recycled aggregates and industrial by-products.The concrete mixes considered in this study are 100NA+100 OPC(Control),100RA+100OPC,50RA+50NA+90OPC+10SF and 50RA+50NA+60OPC+30FA+10SF.The Reinforced Concrete(RC)beam made of 50RA+50NA+60OPC+30FA+10SF concrete mix was found to be the only eco-efficient option.This option has reduced the level of environmental impacts in a cost-competitive manner.The use of this eco-efficient option could also provide new employment opportunities and significant improvements in terms of land and energy resources conservation and bio-diversity enhancement.
