title: Influence of calcium compounds on the mechanical properties of fly ash geopolymer pastes.
abstract: The influence of calcium compounds (CaO and Ca(OH)(2)) on the mechanical properties of fly ash based geopolymers has been studied. Calcium compounds were substituted in fly ash at 1, 2 and 3 wt%, respectively. Curing of the geopolymers was performed at ambient temperature (20 degrees C) and 70 degrees C. Addition of calcium compounds as a fly ash substitute improved mechanical properties for the ambient temperature cured samples while decreasing properties for the 70 degrees C cured samples. Seven days compressive strength of the ambient temperature cured samples increased from 11.8 (2.9) to 22.8 (3.8)MPa and 29.2 (1.1)MPa for 3% CaO and 3% Ca(OH)(2) additions, respectively.
authors.affiliation: Centre for Materials Research, Department of Imaging and Applied Physics, Curtin University of Technology, Perth, WA 6845, Australia. jtemuujin@yahoo.com
authors.forename: J
authors.initials: J
authors.lastname: Temuujin
authors.forename: A
authors.initials: A
authors.lastname: van Riessen
authors.forename: R
authors.initials: R
authors.lastname: Williams
mesh_terms: D017610:Calcium Compounds / Q000737:chemistry*; D002126:Calcium Hydroxide; D002244:Carbon / Q000737:chemistry*; D060729:Coal Ash; D019245:Compressive Strength; D055595:Mechanical Phenomena; D010087:Oxides; D052638:Particulate Matter / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D013696:Temperature
chemical_list: D017610:Calcium Compounds; D060729:Coal Ash; D010087:Oxides; D052638:Particulate Matter; D011108:Polymers; D002244:Carbon; C016538:lime; D002126:Calcium Hydroxide