Influence of mineralogy and activator type on the rheology behaviour and setting time of laterite based geopolymer paste

2021 ◽  
pp. 104345
Author(s):  
Cyriaque Rodrigue Kaze ◽  
Gisèle Laure Lecomte-Nana ◽  
Adeyemi Adesina ◽  
Juvenal Giogetti Deutou Nemaleu ◽  
Elie Kamseu ◽  
...  
Keyword(s):  
Setting Time ◽  
Geopolymer Paste

scholarly journals The Effects of Bottom Ash on Setting Time and Compressive Strength of Fly Ash Geopolymer Paste

2017 ◽  
Vol 267 ◽  
pp. 012002
Author(s):  
B A Affandhie ◽  
P T Kurniasari ◽  
M S Darmawan ◽  
S Subekti ◽  
B Wibowo ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Setting Time ◽  
Bottom Ash ◽  
Geopolymer Paste

scholarly journals Factors influencing strength and setting time of fly ash based-geopolymer paste

2017 ◽  
Vol 138 ◽  
pp. 01010 ◽  
Author(s):  
Adhitya Leonard Wijaya ◽  
Januarti Jaya Ekaputri ◽  
Triwulan
Keyword(s):  
Fly Ash ◽  
Setting Time ◽  
Factors Influencing ◽  
Geopolymer Paste

Effects of Alkaline Solution on the Properties of Slag Based Geopolymer

2018 ◽  
Vol 877 ◽  
pp. 193-199 ◽  
Author(s):  
Suman Saha ◽  
C. Rajasekaran
Keyword(s):  
Compressive Strength ◽  
Sodium Hydroxide ◽  
Sodium Silicate ◽  
Alkaline Solution ◽  
Sodium Hydroxide Solution ◽  
Setting Time ◽  
Sodium Silicate Solution ◽  
Silicate Solution ◽  
Hydroxide Solution ◽  
Geopolymer Paste

Production of Ordinary Portland Cement (OPC) requires huge quantity of natural resources and energy and it releases large amount of carbon - di - oxide to the environment. Therefore, enormous studies have been carried out throughout the world to establish geopolymer as an alternative binder material for the replacement of OPC to protect the environment. This study intends to explore the effects of alkaline solution on the properties of geopolymer produced with ground granulated blast furnace slag. Properties such as Standard consistency, setting time of slag based geopolymer paste has been determined using Vicat’s apparatus (according to the guidelines given by Indian Standards for OPC). In order to determine the effects of alkaline solution on the properties of geopolymers, the concentration of sodium hydroxide solution has been varied from 6M to 16M and the ratio of sodium silicate solution to sodium hydroxide solution is also varied from 1.0 to 2.0. Results indicate higher standard consistency and significant less setting time for slag based geopolymer paste than that of OPC paste. Compressive strength of the geopolymer paste and mortar cube samples, cured in ambient conditions till the day of testing, is increasing with the increase of the concentration of sodium hydroxide solution. Highest compressive strength is obtained for the samples prepared with alkaline solution having the ratio of sodium silicate solution to sodium hydroxide solution as 1.5. But when the concentration of sodium hydroxide solution is beyond 14M, decreasing trend in compressive strength is observed.

scholarly journals Bonding Strength Characteristics of FA-Based Geopolymer Paste as a Repair Material When Applied on OPC Substrate

2020 ◽  
Vol 10 (9) ◽  
pp. 3321 ◽  
Author(s):  
Warid Wazien Ahmad Zailani ◽  
Aissa Bouaissi ◽  
Mohd Mustafa Al Bakri Abdullah ◽  
Rafiza Abd Razak ◽  
Sorachon Yoriya ◽  
...  
Keyword(s):  
Bond Strength ◽  
Bonding Strength ◽  
Shear Test ◽  
Substrate Surface ◽  
Setting Time ◽  
Morphological Properties ◽  
Repair Material ◽  
Optimal Mix ◽  
Slant Shear ◽  
Geopolymer Paste

This investigative study aims to study the mechanical and morphological properties of fly ash (FA)-based geopolymer paste as a repair material when applied on ordinary Portland cement (OPC) overlay concrete. The first part of this study investigates the optimal mix design of FA-based geopolymer paste with various NaOH concentrations of 8, 10, 12, and 14 M, which were used later as a repair material. The second part studies the bonding strength using a slant shear test between the geopolymer repair material and OPC substrate concrete. The results showed that a shorter setting time corresponds to the higher NaOH molarity, within the range of 53 and 30 min at 8 and 14 M, respectively. The compressive strength of FA-based geopolymer paste was found to reach 92.5 MPa at 60 days. Also, from the slant shear test results, prism specimens with 125 mm length and 50 mm wide have a large bond strength of 11 MPa at 12 M. The scanning electron microscopy/energy-dispersive X-ray (SEM/EDX) analysis showed that the OPC substrate has a significant effect on slant shear bond strength, where the presence of free cations of Ca2+ on the OPC substrate surface contributed to the formation of calcium alumina-silicate hydrate gel (C-A-S-H) by building various cross-links of Ca-O-Si.

Investigation on the Degree of Reaction and Strength Performance of Fly Ash Based Geopolymer Binder with Alternative Chemical Reagents

2014 ◽  
Vol 803 ◽  
pp. 115-119
Author(s):  
Norbaizurah Rahman ◽  
Andri Kusbiantoro
Keyword(s):  
Fly Ash ◽  
Citric Acid ◽  
Sodium Nitrate ◽  
Setting Time ◽  
Strength Development ◽  
Degree Of Hydration ◽  
Degree Of Reaction ◽  
High Calcium ◽  
Geopolymer Binder ◽  
Geopolymer Paste

The existence of high calcium contents in fly ash will contribute to the rapid stiffening and low workability of geopolymer paste. This study reports the feasibility of sodium nitrate and citric acid as the alternative admixtures for geopolymer binder. The effects of sodium nitrate and citric acid were independently evaluated at 0.5%, 1.5% and 2.5% of fly ash weight in geopolymer mixture. The effect of these admixtures on fresh geopolymer characteristic was evaluated through series of setting time and flow table workability tests, while degree of hydration, compressive strength and porosity tests were conducted to provide fundamental information on the hardened properties of geopolymer paste. Based on the result of degree of reaction, the inclusion of sodium nitrate in fly ash based geopolymer will increase the level of degree of hydration. Nevertheless, this result is in contrast with citric acid inclusion where degree of hydration decreased along with the increasing dosage of citric acid in the mixture. Strength development of geopolymer paste, particularly during the early age, appears to be affected by various geopolymerization rate presented by these admixtures.

scholarly journals Physical Characteristics and Compressive Strength of Na-Geopolymer Paste Designed by a Taguchi Method

2021 ◽  
Vol 877 (1) ◽  
pp. 012036
Author(s):  
Mohammad A. Ahmed Al-dujaili ◽  
Imad A. Disher Al-hydary ◽  
Zainab Zayer Hassan
Keyword(s):  
Compressive Strength ◽  
Setting Time ◽  
Chemical Activity ◽  
Molar Ratio ◽  
Processing Conditions ◽  
Initial Setting Time ◽  
Initial Setting ◽  
Inorganic Molecules ◽  
Water Amount ◽  
Geopolymer Paste

Abstract Geopolymer paste is a revolutionary building material that the chemical activity of inorganic molecules will create. It is an alternative to traditional Portland cement and is more Eco-friendly. This analysis aimed to classify the mixtures and their process parameters suitable for the development of Geo-polymer paste with one of the ultimate compressive powers, the highest-lowest porosity, and the lowest-lowest final and initial setting time. In the experimental design of the Geo-polymer-based-metakaolin, a Taguchi methodology has been utilized. Five variables parameters were chosen that are mostly to influence the properties of the geopolymer. These are the quantity of Si, alkali, the proportion of alkali reagents, duration of blending, and water amount. These variables’ influence has been calculated at 7 and 28 days on compressive strengths, porosity, density, and setting time. The analysis indicates that the strong compressive strength (115MPa) of Geopolymer paste could be achieved with the formula (1Na2O. Al2O3. 3.8SiO2.xH2O) utilizing suitable processing conditions under which the molar ratio of alkali silicate to alkali hydroxide must be held within the range of 3.25-3.02.

Influence of Glass and Limestone Powders in High Calcium Fly Ash Geopolymer Paste on Compressive Strength and Microstructure

2019 ◽  
Vol 801 ◽  
pp. 397-403
Author(s):  
Pattanapong Topark-Ngarm ◽  
Tawatchai Tho-In ◽  
Vanchai Sata ◽  
Prinya Chindaprasirt ◽  
Trinh Cao
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Glass Powder ◽  
Sodium Hydroxide Solution ◽  
Setting Time ◽  
Limestone Powder ◽  
Hydration Reaction ◽  
High Calcium ◽  
High Calcium Fly Ash ◽  
Geopolymer Paste

The effects of replacing high calcium fly ash with containment glass powder and limestone powder in the geopolymer are investigated in this paper. The high calcium fly ash was replaced by either glass powder or limestone powder at 20% and 40% by weight. The geopolymer paste was tested for setting time and compressive strength and evaluated of its microstructure on SEM, XRD, FTIR, and MIP. The results indicated that the setting time of geopolymer paste was increased with the replacement of glass powder and reduced by replacement of limestone powder. The compressive strengths were generally higher than those of controls. The maximum increase of compressive strength was 33% when replaced fly ash with 20% of glass powder at 8 molar NaOH concentration of sodium hydroxide solution. The microstructure evaluations show the remaining particles of raw materials and the compatible of hydration reaction and polymerization when having limestone powder in the mix proportion. Furthermore, the powder acts as a filler in the gels.

Calcined Kaolin Geopolymeric Powder: Influence of Water-to-Geopolymeric Powder Ratio

2012 ◽  
Vol 548 ◽  
pp. 48-53
Author(s):  
Y.M. Liew ◽  
H. Kamarudin ◽  
A.M. Mustafa Al Bakri ◽  
M. Binhussain ◽  
Luqman Musa ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Portland Cement ◽  
Ordinary Portland Cement ◽  
Setting Time ◽  
Sem Analysis ◽  
Cement Ratio ◽  
Water To Cement Ratio ◽  
Influence Of Water ◽  
Calcined Kaolin ◽  
Geopolymer Paste

This paper describes the synthesis of calcined kaolin geopolymeric powder from the alkaline activation of calcined kaolin followed by solidification and pulverizing process. The geopolymeric powder was used by just adding water to produce resulted geopolymer paste. In this paper, the effect of water-to-geopolymeric powder ratios on the properties of the resulted geopolymer paste was studied. This water-to-geopolymer powder ratio was similar to that of water-to-cement ratio in the case of ordinary Portland cement (OPC). However, the concept used here was based on geopolymerization process. The compressive strength, setting time and SEM analysis of the resulted geopolymer pastes were conducted. Highest strength was achieved at water-to-geopolymer powder ratio of 0.22. The resulted geopolymer paste could be handled up to 120 minutes and reached final setting after about 4 hours of setting. Microstructure showed the formation of geopolymeric gel after the addition of water to the geopolymeric powder.

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