Strength and thermal conductivity of geopolymer pervious concrete made from artificial lightweight aggregate

Abstract

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 (Na2SiO3) 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/m3. 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.

Experimental Investigation on Influence of Molding Methods on Properties of Pervious Concrete

“…Its characteristics make it as good sound-absorbing and heat-insulating material, a bed material for vegetation and sewage purification. Of course, the most widely and longest-lasting material applied as permeable pavement [2][3][4][5][6][7][8][9][10]. It is preferred by engineers to use it in road engineering with the following benefits: precipitation enters the soil through multi-porous while filtering for contaminants in water [11], allow more water to evaporate from the soil and natural recharge of groundwater [12,13], effectively effectively suppress the loss of surface water [14], reduce the urban heat island effect [15], limit the budget cost of building road drainage systems [12], and at the same time, porous materials can effectively absorb noise [16].…”