Advance treatment by nanographite for Portland pulverised fly ash cement (the class F) systems

• Published in: Composites. Part B, Engineering Vol. 82; pp. 59 - 71
• Main Author: Kirgiz, Mehmet S.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.12.2015
• Subjects: A. Nano-structures; A. Recycling; B. Mechanical properties; B. Physical properties; Cements; Compressive strength; Gain; Graphite; Nanostructure; Particulate composites; Portland pulverised fly ash cement; Sand; Tap water; A. Recycling; A. Nano-structures; B. Physical properties; B. Mechanical properties; Portland pulverised fly ash cement
• ISSN: 1359-8368; 1879-1069
• DOI: 10.1016/j.compositesb.2015.08.003

This is a full article that overcomes such some negative side effects as rapid coagulation and reduced early strength in class F fly ash-substituted cement (FFA-SC) by serving nano graphite particle (nG). This study uses class F fly ash (FFA), nG, and ASTM type I cement as constituent materials to prepare proper pulverized fly ash–Portland cement combinations (35% FFA + 65% ASTM I + 1.1% nG i.e.). Pastes include lime and/or lime + nG, and tap water to examine ups and downs in Ca(OH)2 content. Mortars also contain these prepared cements, tap water and/or tap water + super plasticizer (SP), and mortar sand in order to measure fluidity, flexural strength, and compressive strength according to present standard methods. Results indicate for FFA-SC system that the nano graphite particle increases the reduced early strength gain at early age, and the SP reduces the rapid coagulation. The use of nG also shows to be favorable in terms of the Ca(OH)2 content, the fluidity and the flexural strength gain, and compressive strength gain in FFA-SC system when compared to the pure Portland cement with and without nano graphite particle.