A study of the properties of the micro-interface transition zone of lightweight concrete with added recycled green materials
| Autor: | Ting Yeh Yi, 葉怡婷 |
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| Rok vydání: | 2011 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 99 Recycled Green Building Materials of the study is produced in Taiwan, mainly used recycled mineral admixtures includes fly ash, slag, glass sands and rubber particles. Waste LCD glass sands and waste rubber particles 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, 28and 56 days, harden property, NDT test,durability properties and micro-interface test 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 51 MPa at age 56 days, specimens with the replacement amount 5% had the highest compressive strength.Ultrasonic Pulse Velocity of Normal concrete was better than LWAC and was for glass sands replacement amount 10% had the highest value,rubber particles replacement amount 10% had the lowest value. 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.SEM observed that had reticulation hydrated gel in lightweight aggregate about coarse texture at surface, lightweight aggregate bonding effect more than normal aggregate. Fly ash and slag filled with small pores make structure densification. Specimens with the replacement amount glass sands 5% had hydrate promotion. Rubber is a polymer material make a crack width is 23 μm in ITZ.XRD test finded Ca(OH)2 peak at angle of 15°~20°, speculated that pozzolanic reaction consumes Ca(OH)2. Main peak is SiO2 at angle of 26.6° is source strength, because recycl green building materials had composition containing.LOI test had loss reduction in long curing age, 28 curing age specimens with the replacement amount glass sands 5% loss weight more than 7 curing age,it can make structure densification and hydrate promotion. 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. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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