The Study of Different Unit Weight of Aggregate on the Properties of Concrete

• Main Authors: Yu-Chu Peng, 彭予柱
• Other Authors: 黃兆龍
• Format: Others
• Language: zh-TW
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/01643605606361520527

碩士 === 國立臺灣科技大學 === 營建工程系 === 88 === Aiming to study Lightweight and Heavyweight concrete, the sedimentary sludge collected from Shih-Men Reservoir were sintered, based on the composition, into high intensity, and low water absorption structural Lightweight aggregates through volume adjustment, granulation, and temperature control. Also, concrete having respective proportion of w/cm=0.3 and 0.4 were also developed according to the characteristics of Lightweight aggregate in this research. On the other hand, steel balls having specific gravity of 7.86 in two different diameters of 1cm and 0.5cm were developed into Heavyweight concrete with unit weight of 3500 and 5000kg/m3, respectively. The proportion of Heavyweight concrete with unit weight of 3500kg/m3 was w/cm=0.3. Heavyweight concrete with unit weight of 5000kg/m3 were separated into: (1)3 groups having different water to binder ratios (w/cm=0.3, 0.32 and 0.4), (2)3 groups having different water consumption volumes (w=120, 125 and 130 kg/m3), (3)3 groups having the same proportion but different SP consumption volumes (SP=29, 39 and 48 kg/m3) and (4)2 groups having a Normalweight concrete of 2400kg/m3 but different proportions of w/cm=0.3 and 0.4 for comparison. Based on compact proportion, research and development were made on the proportion of the foregoing total 12 groups to carry out tests on fresh properties (slump, flow slump, rheology properties and crack sensitivity), hardened properties (compressive strength , ultrasonic pulse velocity, electric rsistivity,chloride ion penetrability, drying shrinkage) and soundness of Lightweight aggregate. As magically as the research results indicated, unloaded aggregates sintered from sludge have excellent engineering and weatherproof abilities that can be used to replace the reducing sandstone and benefit environmental protection. As shown in the development of concrete having different unit weights, the proportion model can overcome the floating or sinking problem of aggregates and has good workability and stable quality to increase the service time of concrete when thickness of the thick liquid is sufficient and its quality is acceptable. Therefore, concrete having different unit weights can be applied on various parts of a structure in the future to reduce weight, lower the center of mass, enhance shock absorbing ability or be used in a nuclear power equipment. Consequently, when compact proportion techniques are getting more mature and both durability and safety have been taken care of, more diversified concrete can be provided to response to the requirements of various structure designs