Engineering Properties of Cement Mortar Containing Diatomite

• Main Authors: KUO,ZI-YUAN, 郭梓淵
• Other Authors: SHEEN,YEONG-NAIN
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/kt7e77

碩士 === 國立高雄科技大學 === 土木工程系 === 107 === The diatomite is a cerium oxide particle containing fine and amorphous. The diatomite skeleton is highly porous, light in weight, chemically stable and inert. This study investigated the engineering properties of diatomite replaced cement to make cement mortar. The test variables include water/cement ratio (W/C) of 0.4, 0.5 and 0.6, and the substitution amount of diatomite is 0%, 5%, 10% and 20%. The curing age is 3, 7,28,and 56 days,and the high temperatures are 300°C, 500°C, and 700°C, respectively.The test results show that the freshening time, fluidity and twist of the fresh-mixed nature are both reduced in workability and shorter setting time as the amount of substitution of the diatomite increases. Compressive strength, flexural strength and ultrasonic pulse velocity of hard and solid properties. Under different water-cement ratios, the compressive strength and flexural strength decrease with the increase of the substitution amount, and the pulse velocity of the ultrasonic pulse velocity decreases. When the substitution amount is 5%, the intensity approaches the 0% control group, and the ultrasonic pulse velocity has a ultrasonic pulse velocity when the 5% substitution amount is used. The durability water absorption rate increases as the substitution amount increases, and the sulfuric acid resistance decreases as the substitution amount increases, and the heat transfer coefficient substitution amount decreases. The high temperature properties show that the residual strength after high temperature at 300°C and 500°C is higher than the original strength of the control group, and the strength is greatly reduced after high temperature at 700°C. After the high temperature, the ultrasonic pulse velocity is lower than that of the control group, and the pulse velocity is attenuated more significantly with the temperature increase. The microscopic OM analysis showed that the substitution amount of diatomite increased and the surface porosity increased. SEM analysis showed that the substitution of diatomite increased the C-S-H colloid in the test sample.