Open AccessThe strength properties of high calcium fly ash geopolymer specimens incorporating mud-volcanic and limestone variations
Author(s) -
Arie Wardhono,
Yogie Risdianto,
Mochamad Firmansyah Sofianto,
Mohamad Nur,
A. Hajjar Pradipta
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/669/1/012016
Subject(s) - fly ash , volcanic ash , cement , compressive strength , high calcium , materials science , geopolymer , metallurgy , volcano , geology , composite material , geochemistry , calcium
The use of mud-volcanic and fly ash as cement replacement materials is one alternative solution to overcome environmental issues due to the mudflow disaster and polution from cement production process. This paper objective is to identify the use of mud-volcanic and class C fly ash with high calcium content as waste materials in the development of fly ash geopolymer incorporating limestone. The variations of limestone to fly ash are 0.10:0.60, 0.2:0.5, 0.30:0.40, 0.40:0.30, and 0.50:0.20, respectively. The mud-volcanic ratio was kept at 0.30 to maintain the total weight of specimen at 1.00. The compressive strength was performed at 7, 14 and 28 days age, and the specimens were cured at ambient temperature. The depth penetration test was performed by vicat test. The results show that the highest strength value of 16.38 MPa was achieved by fly ash/mud-volcanic geopolymer with ratio of limestone to fly ash of 0.30:0.40. The initial setting time of 90 minutes indicates that the early reaction of fly ash/mud-volcanic geopolymer shows a comparable setting time to the normal concrete with initial setting time of 45 minutes. These results indicate that fly ash and mud-volcanic can be used as cement replacement materials.