| Summary: | 碩士 === 國立高雄應用科技大學 === 土木工程與防災科技研究所 === 98 === Recycled Green Building Materials of the study is produced in Taiwan, mainly used recycled mineral admixtures includes fly ash, slag, glass sands and rubber powder. Waste LCD glass sands and waste rubber powders are used to replace fine aggregates for 0%, 5% and 10% with W/B=0.4. According to ACI proportion specification, lightweight aggregate concrete are produced, after curing for 7, 28,56 and 91 days, harden property, NDT test and durability properties are investigated.
The results showed that, different kinds of recycled green building materials determined the slump. Specimens conformed to the design slump 150-180mm. With the replacement of recycled green building materials increased, the unit weight of LWAC decreased, unit weight decreasing ratio of waste rubber powder higher than waste glass sands, waste glass sands and waste rubber, waste rubber powders was the lowest.
LWAC had better harden properties than normal concrete, and the compressive strength of LWAC at 7 days reached 36 MPa, and reached 56 MPa at age 91 days. Specimens with the replacement amount 5% had the highest compressive strength, followed by controlled group, 10% for waste glass sands, mixing of waste glass and rubber, waste rubber for 5% and 10% respectily. Elastic modulus of waste glass replaument for 5% was the highest, with the age increased, Elastic modulus increased. LWAC which added GBM had better tensile strength, replacement amount of waste glass sands for 5% was the highest and WRP for 10% had the lowest value.
UPV of Normal concrete was better than LWAC and was for 10% had the highest value, WRP for 10% was the lowest. Using GBM could jmprove the surface electric resistance, of Normal weight concrete and LWAC, both of them whose electric resistance reached higher than 20kΩ-cm had corrosion resistance. Add the green building materials can inhibit the regeneration of lightweight aggregate concrete volume change, with replace the amount 5% of waste rubber powder was the lowest (0.01%). Normal weight concrete had better sulfate resistance than the lightweight aggregate concrete, mixing materials have higher benefits than using waste glass sand or waste rubber powders.
Using green building materials in lightweight aggregate concrete can use waste resources effectively, achieve the goal of environmental issues, enhance utilization of recycled green building materials and develop towards waste recycling technology.
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