Method for experimentally determining N-A-S-(H) solubility

RILEM Technical Letters

article

Trevor Williamson¹  Joonkyoung Han¹  Lynn Katz¹  Gaurav Sant²  Maria C. G. Juenger¹ 

[1] The University of Texas at Austin Department of Civil;University of California, Los Angeles Department of Civil and Environmental Engineering and Materials Science and Engineering

关键词: Geopolymers;    Alkali-Activated Cement;    Thermodynamic Models;    Solubility;    Cement Chemistry;   

DOI  :  10.21809/rilemtechlett.2018.63

学科分类：社会科学、人文和艺术（综合）

来源: RILEM Publications SARL

【 摘 要 】

Inorganic polymer binders, also sometimes called geopolymers or alkali-activated cements, can serve as an alternative to ordinary portland cement (OPC) in concrete.  The development of thermodynamic models to predict phase development and, ultimately, engineering properties, of inorganic polymer binders is an important step toward enabling their widespread use. However, such models require self-consistent solubility data of the primary phase in inorganic polymer binders, sodium aluminosilicate hydrate(s). To date, there is very little solubility information available for this phase. Here, a rigorous method for synthesizing sodium aluminosilicate hydrate(s) of controlled composition, and for measuring its solubility is presented. This approach allows complete stoichiometric control over the (initial) solution composition to elucidate directly the development of N-A-S-H composition as it relates to a given solution composition. A review of previous literature related to the solubility of other cementitious materials is presented, and the need for thermodynamic data is discussed. Finally, a sample calculation is presented for determining the solubility product (Ksp) of a laboratory synthesized sodium aluminosilicate hydrate.

【 授权许可】

CC BY