Estimation of geopolymer concrete strength from ultrasonic pulse velocity (UPV) using high power pulser

Ghosh, Rachit; Sagar, S Palit; Kumar, Anil; Gupta, Sunil Kumar; Kumar, Sanjay

doi:10.1016/j.jobe.2017.12.009

Cited by 96 publications

(30 citation statements)

References 21 publications

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“…Moreover, the UPV values in the study were also related with the compressive strength of PRGCs. This is also consistent with Ghosh et al and Shankar and Joshi works which indicated that the UPVs of fly ash‐based geopolymer concrete increased with an increase in compressive strength. In this study, the UPV of PRGCs tended to increase with the compressive strength increasing.…”

Section: Resultssupporting

confidence: 92%

Use of recycled aggregates in pressed fly ash geopolymer concrete

Wongsa

Siriwattanakarn

Nuaklong

et al. 2019

Env Prog and Sustain Energy

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In this study, the physical, mechanical, and thermal properties of pressed geopolymer concrete (PRGC) mixed with recycled concrete aggregate (RC) and recycled concrete block aggregate (RB) were investigated. Lignite coal fly ash, sodium hydroxide solution (NaOH), and sodium silicate solution were used as source materials to make geopolymer paste. The effect of fly ash to aggregate ratios and concentrations of NaOH on PRGC properties were tested. Test results were also compared to those of PRGCs mixed with conventional aggregate (limestone dust, SD). The test results showed that PRGCs containing RC and RB exhibited lower dry density, thermal conductivity, and compressive strength than those of PRGCs containing SD. Nevertheless, the compressive strength of PRGCs mixed with recycled aggregates was close to the compressive strength for moderate strength lightweight concrete as per ACI 213. Moreover, the lower thermal conductivity and dry density indicated better insulating properties than that of PRGCs containing SD. The developed PRGCs containing RC and RB in the study can be used for the manufacturing of hollow geopolymer‐based concrete block which are green material with improved insulating properties.

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Section: Resultssupporting

confidence: 92%

Use of recycled aggregates in pressed fly ash geopolymer concrete

Wongsa

Siriwattanakarn

Nuaklong

et al. 2019

Env Prog and Sustain Energy

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“…The relationship between ultrasonic velocity and compressive strength has been defined by either exponential function [ 22 , 51 , 59 ] or linear function [ 51 , 60 ]. For the early-age behavior of AAC in the current study, an exponential function fits better as shown in Figure 10 a–c with a coefficient of determination (R 2 ) of 0.99 or 1.00.…”

Section: Resultsmentioning

confidence: 99%

Setting Time and Strength Monitoring of Alkali-Activated Cement Mixtures by Ultrasonic Testing

2021

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Alkali-activated cement (AAC) is a promising binder that replaces ordinary Portland cement (OPC). In this study, the development of setting time and strength of AAC mixes were studied using ultrasonic testing method. The test results were compared with traditional Vicat setting time and compressive and flexural strengths. The findings showed that setting times and strengths have a strong correlation with ultrasonic velocity curve. The initial setting time corresponds well with the ultrasonic velocity curve’s dormant period, and the final setting time with the time it takes to reach the velocity curve’s maximum acceleration. Both setting times also showed a correlation with the value of the maximum acceleration. An exponential relation was found between the ultrasonic velocity and the compressive and flexural strengths. The effect of binder content, alkaline solid to binder ratio (AS/B), sodium silicate to sodium hydroxide solids ratio (SS/SH), and total water to total solid binder ratio (TW/TS) on the strength and setting time are also studied using Taguchi method of experimental design. AS/B ratio showed a significant influence on the setting time of AAC while TW/TS ratio showed only a minor effect. The ultrasonic velocities were able to capture the effect of the different parameters similar to the compressive strength. The velocity decreased mainly with the increase of TW/TS ratio and binder content, while AS/B and SS/SH ratios showed a lower influence.

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“…For HLS samples, the procedure was the same with LSG but without adding gypsum. [27,28]. The relative dynamic modulus of elasticity (Ed) was then calculated using Equation 3 [29,30].…”

Section: Sample Preparation and Analysismentioning

confidence: 99%

Byproduct-based ettringite binder – A synergy between ladle slag and gypsum

Nguyen

Adesanya

Ohenoja

et al. 2019

Construction and Building Materials

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Ladle slag (LS) is a byproduct from the steel industry that is usually reactive on its own and hydrates towards cementitious phases when mixed with water. However, these reaction products are often metastable, leading to micro-structural changes between 7 and 30 days after mixing. To address this issue, in this experimental investigation, a new binder was designed where LS was mixed with gypsum in order to deliver an ettringite-based binder (LSG). The experimental results revealed that the dominant crystalline phase of LSG was ettringite, which 2 remained stable with no conversion at later stages. For better understanding of the ettringitebased binder, mortar characterization, mechanical properties, and durability of LSG were investigated. LSG showed good mechanical properties and excellent freeze-thaw resistance after 300 cycles, which is comparable to other calcium sulfoaluminate cements. Therefore, as a result, the byproduct-based ettringite binder synthesized herein could offer a solution to steelmaking byproducts with a low-CO2 binder, which could be used in a wide range of applications in the construction industry.

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Estimation of geopolymer concrete strength from ultrasonic pulse velocity (UPV) using high power pulser

Cited by 96 publications

References 21 publications

Use of recycled aggregates in pressed fly ash geopolymer concrete

Use of recycled aggregates in pressed fly ash geopolymer concrete

Setting Time and Strength Monitoring of Alkali-Activated Cement Mixtures by Ultrasonic Testing

Byproduct-based ettringite binder – A synergy between ladle slag and gypsum

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