Effects of sodium hydroxide and sodium silicate solutions on compressive and shear bond strengths of FA–GBFS geopolymer

Phoo-ngernkham, Tanakorn; Maegawa, Akihiro; Mishima, Naoki; Hatanaka, Shigemitsu; Chindaprasirt, Prinya

doi:10.1016/j.conbuildmat.2015.05.001

Cited by 408 publications

(130 citation statements)

References 41 publications

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“…The compressive strength of NS(P), PC(P), and SS(P) pastes in the present study were 23, 45 and 78 MPa, respectively, showing significant difference. The difference in the compressive strength between NS(P) and SS(P) is due that the hydration products in SS(P) is more densified by soluble silicate in waterglass than that in NS(P) (Phoo-ngernkham et al 2015). However, the compressive strength of NS2_C0, PC2_C0, and SS2_C0 exhibited comparable regardless of the strength of the pastes, when the total void ratios of the porous concretes was similar.…”

Section: Physical Properties Of Carbonated Porous Concretementioning

confidence: 86%

Heavy Metal Leaching, CO2 Uptake and Mechanical Characteristics of Carbonated Porous Concrete with Alkali-Activated Slag and Bottom Ash

Kim

Jang

Naeem

et al. 2015

International Journal of Concrete Structures and Materials

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In the present study, a porous concrete with alkali activated slag (AAS) and coal bottom ash was developed and the effect of carbonation on the physical property, microstructural characteristic, and heavy metal leaching behavior of the porous concrete were investigated. Independent variables, such as the type of the alkali activator and binder, the amount of paste, and CO 2 concentration, were considered. The experimental test results showed that the measured void ratio and compressive strength of the carbonated porous concrete exceeded minimum level stated in ACI 522 for general porous concrete. A new quantitative TG analysis for evaluating CO 2 uptake in AAS was proposed, and the result showed that the CO 2 uptake in AAS paste was approximately twice as high as that in OPC paste. The leached concentrations of heavy metals from carbonated porous concrete were below the relevant environmental criteria.

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Section: Physical Properties Of Carbonated Porous Concretementioning

confidence: 86%

Heavy Metal Leaching, CO2 Uptake and Mechanical Characteristics of Carbonated Porous Concrete with Alkali-Activated Slag and Bottom Ash

Kim

Jang

Naeem

et al. 2015

International Journal of Concrete Structures and Materials

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“…Fly ash (residue from coal combustion) is used finely divided residue resulting from combustion of coal and has been used as cement replacement for the recent years [4]. Sodium silicate (Na 2 SiO 3 ) and sodium hydroxide (NaOH) solutions is commonly used to make an alkaline activator [5,6].…”

Section: Introductionmentioning

confidence: 99%

Effect of Alkaline Activator to Fly Ash Ratio for Geopolymer Stabilized Soil

Abdullah

Ahmad

2017

MATEC Web Conf.

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Abstract. Geopolymer technology have been developed and explored especially in the construction material field. However, lack of research related to geopolymer stabilized soil. In this research, the utilization of geopolymer has been investigated to stabilize the soil including the factors that affecting the geopolymerization process. Unconfined compressive test (UCT) used as indicator to the strength development and hence evaluating the performance of geopolymer stabilized soil. This paper focusing on the effect of fly ash/alkaline activator ratio, Na 2 SiO 3 /NaOH ratio and curing time on geopolymer stabilized soil. A various mix design at different fly ash/alkaline activator ratio, Na 2 SiO 3 /NaOH ratio were prepared and cured for 7 and 28 days. Molarity and the percentage of geopolymer to soil were fixed at 10 molar and 8 percent respectively. Then, the UCT tests were carried out on 38mm diameter x 76mm height specimens. The highest strength obtained at the fly ash/alkaline activator ratio 2.5 and Na 2 SiO 3 /NaOH ratio 2.0 at 28 days curing time.

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“…Hanjitsuwan et al [13] claimed that the formation of N-A-S-H gel was improved at high NaOH concentration. Therefore, the coexistence of N-A-S-H and C-S-H gels could enhance the strength development of FA-PC geopolymer mortar [19]. However at 15M NaOH, it gives lower strength of FA-PC geopolymer mortar than that of 10M NaOH concentration.…”

Section: Compressive Strength Of Fa-pc Geopolymer Mortarmentioning

confidence: 98%

“…In addition, ratio of sand to binder is one of the important factor for considering as repair materials which related to a homogeneous matrix of geopolymer binder as reported by Thakur and Ghosh [14]. In order to utilize geopolymer binder as an alternative repair material, many researchers [2,3,[15][16][17][18][19] have studied the setting time, strength development and bonding strength for proving their properties compared with commercial repair materials in the market. As mentioned, the 7-day strength requirement of rapid hardening cementitious materials was 28.0 MPa as per ASTM C928-13 [20], and the initial setting time and minimum strength requirements for repair binder were 30 minutes and 35.0 MPa, respectively, as per ASTM C881/C881M-14 [21].…”

Section: +mentioning

confidence: 99%

Shear Bond Strength of Fa-Pc Geopoylmer Under Different Sand to Binder Ratios and Sodium Hydroxide Concentrations

Phoo-ngernkham

Hanjitsuwan

Detphan

et al. 2018

GEOMATE

Self Cite

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This paper presents the effects of sand to binder (S/B) ratio and sodium hydroxide (NaOH) concentration on setting time, compressive strength, and shear bond strength of fly ash (FA)-Portland cement (PC) geopolymer binder. Geopolymer binder is manufactured from FA and PC at the ratio of 90:10 by weight of binder. The liquid alkali solution used in this study are sodium hydroxide (NaOH) and sodium silicate (Na2SiO3) solutions. The Na2SiO3/NaOH ratio of 2.0, liquid alkali solution/binder ratio of 0.60, and curing at ambient temperature are fixed in all mixes. The differences in NaOH concentrations of 5, 10 and 15M and S/B ratios of 1.00, 1.25 and 1.50 has been investigated. Test results show that the differences of NaOH concentration and S/B ratio has an effect on setting time, compressive strength and shear bond strength of FA-PC geopolymer mortar. The setting time of mortars are obviously decreased with increasing of S/B ratio whereas the setting time of mortars are obviously increased with increasing of NaOH concentration. The compressive and shear bond strengths of mortars increase as increasing of both S/B ratio and NaOH concentration up to a threshold limit. The highest slant shear strength between Portland cement concrete substrate and FA-PC geopolymer mortar is found in the mortar with 1.25 S/B ratio and 10M NaOH concentration which gives 24.1 MPa.

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Effects of sodium hydroxide and sodium silicate solutions on compressive and shear bond strengths of FA–GBFS geopolymer

Cited by 408 publications

References 41 publications

Heavy Metal Leaching, CO2 Uptake and Mechanical Characteristics of Carbonated Porous Concrete with Alkali-Activated Slag and Bottom Ash

Heavy Metal Leaching, CO2 Uptake and Mechanical Characteristics of Carbonated Porous Concrete with Alkali-Activated Slag and Bottom Ash

Effect of Alkaline Activator to Fly Ash Ratio for Geopolymer Stabilized Soil

Shear Bond Strength of Fa-Pc Geopoylmer Under Different Sand to Binder Ratios and Sodium Hydroxide Concentrations

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