Some studies on the reaction between fly ash and lime

Bulletin of materials science

A K Das¹  N Bandyopadhyay²  A Basumajumdar¹  S Maitra² 

[1] Department of Chemical Technology, University of Calcutta, Kolkata 700 009, India$$Department of Chemical Technology, University of Calcutta, Kolkata 700 009, IndiaDepartment of Chemical Technology, University of Calcutta, Kolkata 700 009, India$$;College of Ceramic Technology, WB University of Technology, Kolkata 700 010, India$$College of Ceramic Technology, WB University of Technology, Kolkata 700 010, IndiaCollege of Ceramic Technology, WB University of Technology, Kolkata 700 010, India$$

关键词: Fly ash;    lime;    compacts;    curing;    kinetics.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

The reaction between fly ash (FA) and lime is extensively exploited for the manufacture of building bricks, blocks and aggregates. To get a better idea of this reaction, FA from different sources were mixed in different ratios with lime and compacted. The compacts were treated both by ordinary water and hydrothermal curing to promote lime bearing hydrate bond formation e.g. CaOâ€�?�SiO₂â€�?�H₂O (Câ€�?�Sâ€�?�H), CaOâ€�?�Al₂O₃â€�?�H₂O (Câ€�?�Aâ€�?�H) etc. The decrease in free lime content in these compacts was measured as a function of curing time and curing process. This drop in this content was correlated to the chemical composition of the fly ashes. The mathematical relationships between free lime remaining in the compacts after its maximum decrease in concentration and lime binding modulus (a ratio between the amount of added lime and the total amount of lime binding constituents present in FA) for both types of curing were developed. Further, the rate of decrease in free CaO content under both types of curing conditions was compared from kinetic study. From this study the orders of the reactions and rate constants were found out.

【 授权许可】

Unknown