Geopolymer Concrete Fabricated by Waste Concrete Sludge with Silica Fume

Abstract

As a relatively new material, geopolymer concrete offers the benefits as a construction material for sustainable development. It utilized waste materials such as recycled concrete sludge, fly ash and etc. It has a very low rate of green house gas emission when compared to ordinary Portland cement. In this study, the component of geopolymer is concrete sludge, metakaolin and water glass, NaOH was used as alkalin activator. To improve the mechanical properties, the amount of NaOH and water glass were varied to obtain higher strength and the specimens were cured both in air and water, then their mechanical properties like compressive strength and bending strength were measured the microstructures were investigated.

A numerical study of triaxial mechanical behaviour of geopolymer at different curing temperatures: An application for geological sequestration wells

“…Emission of CO 2 per tonne of production (Yang et al, 2009) 1 tonne 0.18 tonne Energy requirement for production (Majidi, 2009) 3630 MJ/t /t The cost of production (Lloyd and Rangan, 2010) high 20e30% less than OPC Acid resistance Low High Tensile and compressive strength Ordinary High Shrinkage…”

Individual and combined effects of Portland cement-based hydrated mortar components on alkali-activated slag cement

“…The highest volume wastes of mixed composition are concrete and demolition wastes, which are currently used as coarse and fine secondary aggregates in concrete production after they first mechanically crushed, sieved, and sorted [2][3][4][5][6][7][8][9]. This crushing of concrete wastes, however, leaves behind residual mortar, which is often referred to as waste concrete powder, concrete fines or hydrated mortar waste (HMW).…”

Effect of Elastomeric Expandable Additive on Compressive Strength and Linear Expansion of Fly-Ash-Based Strength-Enhanced Geopolymer Cement for Shrinkage-Resistant Oil-Well Cementing

“…Apart from low shrinkage and resistance toward carbonation, a vast array of other advantages pertaining to the material properties of GPC in comparison to OPC has been reported in previous research; the advantages include, but are not limited to, high mechanical strength; high pumpability; low permeability toward the flow of water and gas, with the potential for further reduction when exposed to higher pressures, as in oil-well cementing; low Young's modulus; resistance to acid attacks; resistance to alkali-aggregate reaction; resistance to freeze-thaw cycles; stability at high temperatures; and tolerance to contamination with oil-based mud [1,33,[36][37][38][39][40][41]. Moreover, the adoption of GPC as an alternative to OPC presents a cost-and energy-efficient solution, as the manufacturing process of GPC consumes less energy with a carbon emission of only about 0.184 ton of CO 2 for every ton of GPC produced, as compared to 1 ton of CO 2 for every ton of OPC produced, with, coincidentally, less cost [1,[41][42][43][44][45].…”