Investigation the Increase of Excavability of CLSM with EPS and Mudstone

• Main Authors: Ching-YuanYang, 楊慶元
• Other Authors: Jian-Hong Wu
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/90160369831167298676

碩士 === 國立成功大學 === 土木工程學系專班 === 101 === The use of controlled low strength Materials （CLSM）in backfilling has gained its popularity in recent years. The application of CLSM pellets is numerous and has been applied to the production of concrete aggregates, site excavation, and recycled aggregate. Expanded Polystyrene (EPS) is the material that has the properties of lightness, compressibility, low absorption capacity, and low strength capacity. The mudstone reveals the characteristics of low intensity, low durability and low permeability when soaked in water.The mixture of EPS and mudstone with controlled low strength Materials （CLSM）has shown to be advantageous in re-excavation performance after the ratio of sample assessment. It is suggested that the mixture is applicable to the needs of the low-intensity backfilling. The three proportioning materials mixes—conventional CLSM, mudstone CLSM and EPS CLSM—are made under the circumstances of (a) fixed variable of water to binder ratio (W/B=2.8) (b) saturated surface dry (S.S.D 400kg) and (c) 280kg water. Series of experiments are conducted via air content, slump flow, ultrasonic, compressive strength and slake durability to investigate workability, strength capacity, deformation capacity and durability in this study. Four study results have been concluded as follows. First, mudstone CLSM, EPS CLSM and modified CLSM reach the Outline of the construction of the Public Construction Commission, Executive Yuan 03377, controlled low strength materials in terms of work capacity. Second, EPS CLSM reveals the lowest peak strength capacity among all in terms of the strength capacity. Third, mudstone CLSM, EPS CLSM and modified CLSM demonstrates the best compressibility overall in terms of the transformation capacity. Fourth, modified mudstone CLSM and EPS CLSM show their low durability in terms of the weathering prevention. Based on the results aforementioned, it can be confirmed that EPS and mudstone can enhance the potentiality of CLSM excavation.