Open AccessStrength and thermal conductivity of geopolymer pervious concrete made from artificial lightweight aggregate
Author(s) -
Ibtesam F. Nasser,
Wasan I. Khalil,
WA Abbas
Publication year - 2020
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/737/1/012074
Subject(s) - fly ash , geopolymer , sodium silicate , materials science , compressive strength , sodium hydroxide , aggregate (composite) , ultimate tensile strength , composite material , thermal conductivity , porosity , sodium , calcium hydroxide , chemical engineering , metallurgy , engineering
In this paper, geopolymer lightweight aggregate pervious concrete (GPLWAPC) was studied. It utilized two ratios of blending, which are 1:4 and 1:5 (fly ash: local artificial coarse aggregate). The rough aggregates utilized were graded as well as made of single size. An optimal ratio of aggregates content was achieved via the technique of trial and error. The fly ash (FA) that was used was low calcium, while the alkali activating element represents sodium hydroxide (NaOH) along with sodium silicate (Na 2 SiO 3 ) with proportion of 1:2.5. Mixture was made with alkaline liquid to fly ash 0.4 proportion, NaOH concentration of 16 molarity was used. The artificial graded coarse aggregate to fly ash proportion of 1:4 shows the highest compressive strength with 5.2 MPa at 7 days with density of 1340 kg/m 3 . Many experimental investigations on GPLWAPC were investigated; workability and the strengths of compressive and splitting tensile, at the age of 7, 28 and 56 day, were studied. Moreover, thermal conductivity and scanning electronic microscopy were examined at 28 day age for the same mixture.