Influence of Heat Pre-Treatment on Washing Pre-Treated MSWI Fly Ash Cementitious Activity

Abstract:

The influence of heat pre-treated temperature (600°C、700°C、800°C and 900°C) on washing pre-treated MSWI fly ash (PW-MSWI) cementitious activity was studied by mortar experiment. Concrete experiment was also conducted to figure out the influence of both PW-MSWI and heat pre-treated PW-MSWI(PWH-MSWI) on concrete strength development. Hydration mechanism and products of cement-MSWI cementitious system were analyzed by XRD and DSC-TG. The results show that heat pre-treatment improve the early-age activity, but reduce the later-age activity of PW-MSWI. The best heat pre-treated temperature is 700°C. Both PW-MSWI and PWH-MSWI improve the early-age strength, but harmful to later strength development of concrete. PWH-MSWI is better on concrete early strength improvement than PW-MSWI. In contrast to cement, more ettringite and chemical bonding water are formed during the early-age hydration of cement-MSWI cementitious system, but the hydration rate of ettringite and calcium hydroxide slow down in later age, leading to less chemical bonding water.

• Periodical: Materials Science Forum (Volume 852)
• Pages: 1421-1428
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.852.1421
• Online since: April 2016
• Authors: He Zhang, Hui Sheng Shi
• Keywords: Cementitious Activity, Concrete, Heat Pre-Treatment, Washing Pre-Treated MSWI Fly Ash

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