Solving the perpetual problem of imperative use heat curing for fly ash geopolymer cement by using sugar beet waste

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.

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Multiscale Model of Influence of Heat Curing on Fly-Ash Concrete Mixtures

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1054.162 ◽

2014 ◽

Vol 1054 ◽

pp. 162-167

Author(s):

Tomáš Váchal ◽

Rostislav Šulc ◽

Pavel Svoboda

Keyword(s):

Fly Ash ◽

Mechanical Characteristics ◽

Multiscale Model ◽

Heat Energy ◽

Correct Treatment ◽

Fly Ash Concrete ◽

Concrete Mixtures ◽

Heat Curing ◽

Time Period ◽

Quantity Of Heat

This paper describes influence of time and temperature of heat curing on progress of mechanical characteristics of concrete mixtures based on alkali activated fly-ash (POPbeton). One of the major impacts for the correct treatment of alkaline activation is the quantity of heat energy in a given time period which is supplied during activation. The paper describes the dependence of progress of compressive strength of POPbeton on the time and temperature of heat curing. It was assembled a predictive model which describes the dependence of the supplied heat energy over time on the resulting properties of POPbeton. The result is a tool that can predict the resulting values of mechanical characteristics of test samples of POPbeton.

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Mechanical and microstructural properties of high calcium fly ash one-part geopolymer cement made with granular activator

Heliyon ◽

10.1016/j.heliyon.2019.e02255 ◽

2019 ◽

Vol 5 (9) ◽

pp. e02255 ◽

Cited By ~ 7

Author(s):

Bashar S. Mohammed ◽

Sani Haruna ◽

M.M.A. Wahab ◽

M.S. Liew ◽

Abdulrahman Haruna

Keyword(s):

Fly Ash ◽

Microstructural Properties ◽

High Calcium ◽

High Calcium Fly Ash ◽

Geopolymer Cement ◽

Mechanical And Microstructural Properties

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Influence Factors on the Properties of Ultrahigh-Performance Fiber-Reinforced Concrete Cured under the Condition of Room Temperature

Advances in Civil Engineering ◽

10.1155/2018/2754735 ◽

2018 ◽

Vol 2018 ◽

pp. 1-9

Author(s):

Pu Zhang ◽

Yiliang Huang ◽

Yongqi Li ◽

Jun Zhao ◽

Hengqian Dong ◽

...

Keyword(s):

Compressive Strength ◽

Reinforced Concrete ◽

Fly Ash ◽

Influence Factors ◽

Volume Ratio ◽

Fiber Reinforced Concrete ◽

Fiber Reinforced ◽

Curing Conditions ◽

Heat Curing ◽

Composition Materials

Ultrahigh-performance fiber-reinforced concrete (UHPFRC) is a new type of concrete with excellent performance and good application prospects. However, expensive heat curing or high-pressure curing was often adopted to ensure the sufficient compressive strength. This study focuses on improving the compressive strength and workability of UHPFRC by changing the composition materials and the mixture ratios under standard curing conditions. The 0-1 mm and 1∼3 mm sintered bauxite was adopted as coarse aggregate. UHPFRC with high compressive strength and good workability was developed by changing the water-binder ratios, by adding ground-granulated blast furnace slag (GGBFS) or fly ash, and by changing the bauxite content of different particle sizes. When the volume ratio of steel fiber was 3%, the recommend water to binder ratio was 0.194 according to this experiment, the dosage of GGBFS-replaced cement is recommended as 20%, the dosage of fly ash instead of silica fume is recommended as 30%. The recommend ratio of 0-1 mm and 1∼3 mm sintered bauxite was 1.51 : 1. Finally, a kind of UHPFRC material with a compressive strength of 152.4 MPa and a slump of 120 mm was developed under the standard curing conditions.

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Utilization of Fly Ash with Higher Loss on Ignition for Geopolymer Mortar

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1129.614 ◽

2015 ◽

Vol 1129 ◽

pp. 614-620

Author(s):

Yasutaka Sagawa ◽

Shu Ota ◽

Koji Harada ◽

Takeyoshi Nishizaki ◽

Hiroki Goda

Keyword(s):

Compressive Strength ◽

Fly Ash ◽

Coal Fly Ash ◽

Drying Shrinkage ◽

Silicate Material ◽

Loss On Ignition ◽

Heat Curing ◽

Higher Temperature ◽

Curing Condition ◽

Class F Fly Ash

In this study, utilization of coal fly ash with higher loss on ignition (LOI) for geopolymer mortar was investigated. The fly ash with approximately 9% of LOI was compared with Class F fly ash. Relationship between heat curing condition and strength was clarified. As the results, although compressive strength of geopolymer mortar with higher LOI was 30-50% smaller, it was available for geopolymer mortar as an alumina silicate material. The higher temperature and the longer period for initial curing, the higher strength was obtained. In order to decrease drying shrinkage, the higher temperature and the longer period for heat curing were required.

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Mechanical Behavior of Double Skinned Composite Hollow Columns using Geopolymer Concrete

International Journal of Recent Technology and Engineering - 2 ◽

10.35940/ijrte.e6930.018520 ◽

2020 ◽

Vol 8 (5) ◽

pp. 4691-4696

Keyword(s):

Blast Furnace ◽

Fly Ash ◽

Blast Furnace Slag ◽

Steel Tube ◽

Fine Aggregate ◽

Geopolymer Concrete ◽

Ambient Temperatures ◽

Granulated Blast Furnace Slag ◽

Heat Curing ◽

Furnace Slag

This paper comprises of the experimental study of double skinned (DSCFT) Composite hollow columns using Geopolymer concrete. The diameter-thickness (D/t) ratio and the hollowness ratio were consideredas main parameters in designing the specimens. The Geopolymer Concrete used in this project is the most promising technique. It is composed of fly-ash, fine aggregate, coarse aggregate and alkaline solution. By using large volume of ordinary Portland cement (OPC) concrete, the production of cement increases 3% annually. The production of one ton of cement directly liberates about 1 ton of CO2 and indirectly liberates 0.4 ton of CO2 to atmosphere. Among the greenhouse gases, CO2 contributes about 67% of global warming. In this respect fly ash based geopolymer mortar is highly considerable. But most of the previous works on fly ash-based geopolymers concrete reveals that hardening is due to heat curing, which is considered as a limitation for cast in situ applications at low ambient temperatures. In order to overcome this situation, replacing the Ground blast furnace slag with fly ash for various proportions to achieve geopolymer concrete suitable for curing without elevated heat. The Scope of this project is to find optimization level of Ground Granulated blast furnace slag in geopolymer concrete for curing in ambient condition and to analyze the compressive Strength of optimized GGBS based Geopolymer Concrete filled double skinned steel tube by varying the size of the steel tubes.

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Optimization of the Mix Formulation of Geopolymer using Nickel-laterite Mine Waste and Coal Fly Ash

10.20944/preprints202011.0580.v2 ◽

2020 ◽

Author(s):

Alberto Jr Longos ◽

April Anne Tigue ◽

Ithan Jessemar Dollente ◽

Roy Alvin Malenab ◽

Ivyleen Bernardo-Arugay ◽

...

Keyword(s):

Fly Ash ◽

Raw Materials ◽

Mine Waste ◽

Coal Fly Ash ◽

Plain Concrete ◽

Nickel Laterite ◽

Precursor Ratio ◽

Geopolymer Cement ◽

Material Utilization ◽

Lower Carbon

Geopolymer cement has been popularly studied nowadays compared to ordinary Portland cement because it demonstrated superior environmental advantages due to its lower carbon emissions and waste material utilization. This paper focuses on the formulation of geopolymer cement from nickel-laterite mine waste (NMW) and coal fly ash (CFA) as geopolymer precursors, and sodium hydroxide (SH) and sodium silicate (SS) as alkali activators. Different mix formulations of raw materials are synthesized to produce a geopolymer based from an I-optimal design and obtained different compressive strengths. A mixed formulation of 50% NMW and 50% CFA, SH-to-SS ratio of 0.5, and an activator-to-precursor ratio of 0.429 yielded the highest 28-day unconfined compressive strength (UCS) of 22.10 ± 5.40 MPa. Furthermore, using an optimized formulation of 50.12% NMW, SH-to-SS ratio of 0.516, and an activator-to-precursor ratio of 0.428, a UCS value of 36.30 ± 3.60 MPa was obtained. The result implies that the synthesized geopolymer material can be potentially used for concrete structures and pavers, pedestrian pavers, light traffic pavers, and plain concrete.

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Influence of some additives on the properties of fly ash based geopolymer cement mortars

SN Applied Sciences ◽

10.1007/s42452-019-0506-4 ◽

2019 ◽

Vol 1 (5) ◽

Author(s):

Mukesh Kumar ◽

Sunil Kumar Saxena ◽

Nakshatra Bahadur Singh

Keyword(s):

Fly Ash ◽

Cement Mortars ◽

Geopolymer Cement

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