Study on Effect of Low Calcium Fly Ash on Geopolymer Cement for Oil Well Cementing

2015 ◽  
Author(s):  
Maheswaren Sugumaran
Keyword(s):  
Fly Ash ◽  
Oil Well ◽  
Low Calcium ◽  
Geopolymer Cement

Influence of sulfuric and hydrochloric acid on the resistance of geopolymer cement with nano-silica additive for oil well cement application

2018 ◽  
Vol 9 (5) ◽  
pp. 616-624 ◽  
Author(s):  
Syahrir Ridha ◽  
Afif Izwan Abd Hamid ◽  
Riau Andriana Setiawan ◽  
Ahmad Radzi Shahari
Keyword(s):  
Fly Ash ◽  
Hydrochloric Acid ◽  
Strength Increase ◽  
Oil Well ◽  
Nano Silica ◽  
Content Type ◽  
Oil Well Cement ◽  
Geopolymer Cement ◽  
Well Cement ◽  
Silica Additive

PurposeThe purpose of this paper is to investigate the resistivity of geopolymer cement with nano-silica additive toward acid exposure for oil well cement application.Design/methodology/approachAn experimental study was conducted to assess the acid resistance of fly ash-based geopolymer cement with nano-silica additive at a concentration of 0 and 1 wt.% to understand its effect on the strength and microstructural development. Geopolymer cement of Class C fly ash and API Class G cement were used. The alkaline activator was prepared by mixing the proportion of sodium hydroxide (NaOH) solutions of 8 M and sodium silicate (Na2SiO3) using ratio of 1:2.5 by weight. After casting, the specimens were subjected to elevated curing condition at 3,500 psi and 130°C for 24 h. Durability of cement samples was assessed by immersing them in 15 wt.% of hydrochloric acid and 15 wt.% sulfuric acid for a period of 14 days. Evaluation of its resistance in terms of compressive strength and microstructural behavior were carried out by using ELE ADR 3000 and SEM, respectively.FindingsThe paper shows that geopolymer cement with 1 wt.% addition of nano-silica were highly resistant to sulfuric and hydrochloric acid. The strength increase was contributed by the densification of the microstructure with the addition of nano-silica.Originality/valueThis paper investigates the mechanical property and microstructure behavior of emerging geopolymer cement due to hydrochloric and sulfuric acids exposure. The results provide potential application of fly ash-based geopolymer cement as oil well cementing.

Effects of Fly Ash and Superplasticizers on the Rheology of Cement Slurries

1984 ◽  
Vol 43 ◽  
Author(s):  
Elizabeth L. White ◽  
Maria Lenkei ◽  
Della M. Roy ◽  
Ferenc D. Tamas
Keyword(s):  
Fly Ash ◽  
Partial Substitution ◽  
Oil Well ◽  
Low Calcium ◽  
Chemical Admixture ◽  
High Calcium ◽  
High Calcium Fly Ash ◽  
Oil Well Cement ◽  
Large Particles ◽  
Well Cement

AbstractCementitious slurries composed of an oil well cement, a high calcium fly ash, a low calcium fly ash, and three commercially available superplasticizers (two different sulfonated naphthalene formaldehyde condensates and a sulfonated melamine formaldehyde condensate)were mixed to contrast the two fly ashes and to determine the effectiveness of each of the superplasticizing agents. Most commercial superplasticizers and cements are relatively expansive; therefore a partial substitution by fly ash and other by-products represents a substantial savings in both quantity of chemical admixture required and energy consumption for the manufacture of cement. In the cement/fly ash mixtures of 100/0, 90/10, 60/40, 40/60, and 10/90, with both high calcium fly ash and low calcium fly ash, the mixture containing the low calcium fly ash was consistently less workable. The rheological properties of the high vs. low calcium fly ash mixtures were controlled by the differences in fly ash particle size and the presence of irregular large particles, rather than by the differences in chemistry between the two. The low calcium fly ash was the coarser material.

scholarly journals Behaviour of Fly Ash based Geopolymer Concrete using Nano-Material

2019 ◽  
Vol 8 (12) ◽  
pp. 4436-4439 ◽  
Keyword(s):  
Fly Ash ◽  
Polymer Concrete ◽  
Binding Property ◽  
Fine Aggregate ◽  
Geopolymer Concrete ◽  
Nano Technology ◽  
Aluminum Oxides ◽  
Low Calcium ◽  
Geopolymer Cement ◽  
The Impact

In the Construction sector the need of cement is expanding step by step for fulfilling the need of improvement of foundation developments. The creation of Ordinary Portland concrete emanates the enormous amount of CO2 into the climate. Hence, it is basic to discover choices to make the solid eco - neighborly. Low calcium fly ash based geopolymer cement is a substitute choice for bond based cement. It is an inorganic alumina-silicate compound, blended from fly ash remains. The exploratory work on Geopolymer cement is to assess the impact of different parameters influencing its compressive quality and usefulness of cement so as to improve its general execution was extended. Basic arrangement utilized for present examination is mix of sodium hydroxide and sodium silicate. By applying the Nano Technology, expansion of Nano silica is to improve the quality of cement. The essential distinction between geo-polymer cement and Portland bond cement is the binding property. The silicon and aluminum oxides in the low-calcium fly slag responds with the soluble fluid to frame the geo-polymer concrete that ties the free coarse aggregate, fine aggregate, and other un-responded materials together to shape the geo-polymer concrete. As on account of Portland bond concrete, the coarse and fine totals possess around 75 to 80% of the mass of geo-polymer concrete. The impact of totals, for example, reviewing, precision and quality, are viewed as equivalent to on account of Portland bond concrete. Along these lines, this segment of geo-polymer solid blends can be structured utilizing the instruments as of now accessible bond for Portland concrete. The principle goal of this exploration work is to break down the carbon dioxide free cementitious material with its quality, functionality properties and their impacts on Geopolymer concrete for maintainable improvement.

Microstructure Behavior of Fly Ash-Based Geopolymer Cement Exposed to Acidic Environment for Oil Well Cementing

2018 ◽  
Vol 43 (11) ◽  
pp. 6413-6428 ◽  
Author(s):  
Syahrir Ridha ◽  
Afif Izwan Abd Hamid ◽  
Riau Andriana Setiawan ◽  
Mohamad Arif Ibrahim ◽  
Ahmad Radzi Shahari
Keyword(s):  
Fly Ash ◽  
Oil Well ◽  
Acidic Environment ◽  
Geopolymer Cement

scholarly journals Practical Prediction Models of Tensile Strength and Reinforcement-Concrete Bond Strength of Low-Calcium Fly Ash Geopolymer Concrete

Polymers ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 875
Author(s):  
Chenchen Luan ◽  
Qingyuan Wang ◽  
Fuhua Yang ◽  
Kuanyu Zhang ◽  
Nodir Utashev ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Fly Ash ◽  
Bond Strength ◽  
Prediction Models ◽  
Splitting Tensile Strength ◽  
Geopolymer Concrete ◽  
Structural Factors ◽  
Test Results ◽  
Portland Cement Concrete ◽  
Low Calcium

There have been a few attempts to develop prediction models of splitting tensile strength and reinforcement-concrete bond strength of FAGC (low-calcium fly ash geopolymer concrete), however, no model can be used as a design equation. Therefore, this paper aimed to provide practical prediction models. Using 115 test results for splitting tensile strength and 147 test results for bond strength from experiments and previous literature, considering the effect of size and shape on strength and structural factors on bond strength, this paper developed and verified updated prediction models and the 90% prediction intervals by regression analysis. The models can be used as design equations and applied for estimating the cracking behaviors and calculating the design anchorage length of reinforced FAGC beams. The strength models of PCC (Portland cement concrete) overestimate the splitting tensile strength and reinforcement-concrete bond strength of FAGC, so PCC’s models are not recommended as the design equations.

Development of low-calcium fly ash-based geopolymer mortar using nanosilica and hybrid fibers

2021 ◽  
Author(s):  
Keyu Chen ◽  
Dazhi Wu ◽  
HaiXiang Chen ◽  
Guoqing Zhang ◽  
Ruolan Yao ◽  
...  
Keyword(s):  
Fly Ash ◽  
Hybrid Fibers ◽  
Low Calcium

scholarly journals Action Time-Effect and Mechanism of Low-Calcium Fly Ash in Cement-Based Composites

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 681
Author(s):  
Na Yan ◽  
Qingqing Tang ◽  
Ying Zhang ◽  
Guowen Sun
Keyword(s):  
Fly Ash ◽  
Nitrogen Adsorption ◽  
Chemical Effect ◽  
Hydration Products ◽  
X Ray Diffraction ◽  
Degree Of Hydration ◽  
Surface Areas ◽  
Activity Effect ◽  
Low Calcium ◽  
Pore Size Distributions

This study was conducted in order to investigate when low-calcium fly ash plays a physical or chemical effect and what is the chemical effect proportion of low-calcium fly ash. Two types of low-calcium fly ash and quartz powder, with similar fineness as active and inert admixtures, were used as materials in this study. Under different water/binder ratios and hydration ages, the effects of the different types of admixtures and their dosages on the flexural and compressive strength of the composites were studied. X-ray diffraction (XRD), scanning electron microscopy (SEM) and nitrogen adsorption methods, in addition to an assessment of the degree of hydration of the fly ash, were employed to observe the hydration products at different ages, the microstructures of the hydration products, as well as their surface areas and pore size distributions. The results show that during the hydration period of 28 days, the low-calcium fly ash has a micro-aggregate filling physical effect. However, after 56 days, the hydration degree of fly ash begins to exceed 1%. This illustrates that the low-calcium fly ash has both the pozzolanic activity effect and micro-aggregate filling effect. In contrast, the low-calcium fly ash hydrated for 90 days is still dominated by the physical filling effect.

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