Application of Carbide Slag in Autoclaved Aerated Concrete

Conference paper
Part of the Springer Proceedings in Energy book series (SPE)

Abstract

Carbide slag is a solid waste which is difficult to handle. When it is used to substitute for lime to produce autoclaved aerated concrete (AAC) block without necessary treatments, the aeration efficiency is low and density of the AAC block is high. Besides, the initial mechanical strength of the block is lower because of lower curing temperature in static placing stage. The influence of hot water and pre-curing process (50 °C, 5 h) before static placing phase were investigated in this paper. The results show that when the substitution ratio of carbide slag for lime is below 50%, the performance of the AAC block is good enough to reach the level of standard GB11968-2006. As the substitution ratio is 38%, the compressive strength is 5.55 MPa with a dry density of 620 kg/m3. The application of carbide slag as substitution for lime is realized in production of AAC block and the production cost is well reduced.

Keywords

Solid waste Carbide slag Autoclaved aerated concrete Pre-curing process 

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Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  1. 1.Hebei University of Science and TechnologyShijiazhuangChina
  2. 2.Hebei Engineering Research Center of Solid Wastes UtilizationShijiazhuangChina

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