A study on the mix proportion and properties of wasted LCD glass applied to controlled low strength materials concrete (CLSM)

• Main Authors: Jyun-Sheng Chen, 陳俊升
• Other Authors: Her-yuan Wang
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/74061265842323656343

碩士 === 國立高雄應用科技大學 === 土木工程與防災科技研究所 === 96 === The domestic production of TFT-LCD front-panel has global share of 39.2%, the number 1 occupation rate in the world. A great amount of wastes was produced in the making process. The controlled low strength material has been applied extensively to pipeline refill and pavement foundations world-wide. The objective of this research is to apply the wasted LCD glasses to CLSM to reach the purpose of recycling. In this research, we use 100 kg/m3 cement as a fixed dosage. The designed water-binder ratio are 1.1, 1.3 and 1.5%, the glass replace sand ratio are 0, 10, 20 and 30%. Fly ash and glass powder was added to produce a general type of specimen while early strong type was added to manufacture early strength high Silicon contained CLSM specimen. Both were tested for their compressive strength, supersonic test, electrical resistance value and shrinkage for curing age of 1, 3, 7, 28, 56 and 90 days respectively. Results show that slump range from 200 to 250 mm for general types of WGCSLM and 190 to 210 mm for early strong type whose W/B = 1.1. Slump flow reach 420~450 mm for every control set except for 10% glass sand replace under W/B=1.1. Their unit weights range from 2130 to 2180 kg/m3, slightly lighter than the normal concrete. Air content for three W/B ratios are 0.6~0.8% for general type and 1.4~2.0% for early strong type. Setting time of normal type for 10% glass sand replacement is the shortest while 30% is the longest. Bleeding range from 84.5~177.6 ml for normal and 90.9~137.7 ml for early strong type. Compressive strength of 28 days are 2.87~2.40 MPa for normal and 3.12~2.88 for early strong type. The ultrasonic pulse velocity of general type is between 1267~3104 ms/s, while the early types are faster. Electrical resistance of 28 days for general type is 6.7~8.2 kΩ -cm, and twice as much for early strong type. Permeability Ratio is 1.03%~2.02% for normal and 0.35%~0.75% for early strong type. The shrinkage of WGCLSM was below 0.025% for all kinds of proportions, which indicate change in volume is very stable. By different water glue ratio and glass sand replacement, this research find out applicability and usage mechanism for discarded LCD glass in the low controlled strength concrete so that industrial wasted glass can be reduce and recycling purpose can be achieved.