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

Abstract

The present study aimed to investigate the effect of an expandable additive on the compressive strength and linear expansion of geopolymer cement, which is an alternative to ordinary Portland cement, for oil-well cementing. Fly-ash-based geopolymer cement samples, with the addition of slag cement as a strength enhancer, were prepared by using an elastomeric expandable additive (R-additive), which consists of styrene–butadiene rubber with a specific gravity of 0.945, at concentrations of 10%, 15%, 20% and 25% by weight of the solid blend, and cured in a water bath at 60 °C and atmospheric pressure, and a curing chamber at 90 °C and 3000 psi, or approximately 20.68 MPa. Mixability, amount of free water and slurry density were studied, and the effects of the concentration of R-additive on the compressive strength (F) and linear expansion (∆l/l0) of the samples were analyzed. When cured at 60 °C and atmospheric pressure, the highest F of 15.01 MPa was obtained when the concentration of R-additive was 10%, while the highest ∆l/l0 of 0.9985% was obtained when the concentration of R-additive was 25%. An increase in the curing temperature and pressure to 90 °C and 3000 psi (≈20.68 MPa) resulted in the reduction of F from 15.01 to 14.62 MPa and from 10.33 to 9.61 MPa, and the increase in ∆l/l0 from 0.52% to 0.63%, and from 0.99% to 1.32%, when the concentrations of R-additive were 10% and 25%, respectively. The findings suggest that the formulations adopted, which contain R-additive at concentrations ranging from 10% to 25%, fulfilled the requirements of the oil and gas industry.

Compressive and Splitting Tensile Strengths of Coconut-Coir-Fibre-Reinforced Concrete: Effect of Fibre Volume

“…Agricultural and industrial wastes can potentially be re-used for production of green construction materials as alternatives. Examples of the re-use that are prevalent in research are that of rice husk [1,2], which is an agricultural waste material, and fly ash [3][4][5][6], which is an industrial waste material, for production of cementitious binders. At the same time, re-use of the wastes can enhance the economic viability of the industries and address issues pertaining to disposal of the wastes.…”

Extraction of Silica from Sugarcane Bagasse Ash for Cement Replacement in Concrete: Effect of Treatment and Burning Temperature

“…In order to meet demands without further increasing environmental damage, eco-friendly alternatives to cement have been proposed [1]. Increasing amounts of agricultural and industrial wastes have prompted researchers to re-use the wastes as prospective cement replacement materials, such as fly ash [2][3][4][5][6][7][8], rice husk ash [9][10][11], palm oil fuel ash [12] and sugarcane bagasse ash [13,14].…”

Sugarcane-Bagasse-Fibre-Reinforced Concrete: Evaluation of Compressive and Splitting Tensile Strengths

“…At the same time, industrial waste is produced at a high rate and their disposal is an environmental concern. In view of the concern, adoption of waste materials in construction materials has been studied, predominantly as cement replacement materials [1][2][3][4][5][6] or additives [7,8]. On the other hand, fibre-reinforced concrete (FRC) is a type of concrete that employs steel or synthetic fibres.…”