Effect of cement addition, solution resting time and curing characteristics on fly ash based geopolymer concrete performance

Aliabdo, Ali A.; Elmoaty, Abd Elmoaty M. Abd; Salem, Hazem A.

doi:10.1016/j.conbuildmat.2016.07.043

Cited by 126 publications

(61 citation statements)

References 13 publications

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“…The increase in strength with increase in molarity of NaOH solution is attributed to the fact that high molarity increases the formation of alumina silicates and geopolymeric gel because of the filtering of silica and alumina. 41 The observed optimum molarity as can be observed from Figure 3 at 80 C is 14 M. A slight reduction in strength is observed at each curing temperature when molarity increases from 14 to 16 M. The same has been reported by Manoj et al 43 and Aliabdo et al 46 Earlier Zuhua et al 47 reported that decrease in strength beyond the 14 M solution of NaOH might be due to the formation of excess negative OH concentration which further helps in the formation of sodium carbonate by atmospheric carbonation. The same has been reported by Barbosa et al 48,49 Figures 2 and 3 clearly show that there is some interaction between molarity and temperature.…”

Section: Effect Of Molarity Of Naoh Solutionsupporting

confidence: 80%

“…However, Figure also reveals that alternative quadratic model has a significant quadratic term and a higher adjusted R‐squared and can also be considered instead. Increase in compressive strength with increase in activator‐to‐fly ash ratio has been reported by Aliabdo et al…”

Section: Resultssupporting

confidence: 51%

“…A decrease in compressive strength with increase in NaOH/Na 2 SiO 3 ratio has been reported by Aliabdo et al A reduced amount of silicate increases the compressive strength. By increase in alkali or decrease in silicate increase in compressive strength is expected .…”

Section: Resultsmentioning

confidence: 59%

See 2 more Smart Citations

A statistical investigation of different parameters influencing compressive strength of fly ash induced geopolymer concrete

Rai

Roy

Rajjak

2018

Structural Concrete

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This paper statistically investigates the influence of parameter, namely curing temperature, molarity, NaOH/Na2SiO3, and activator‐to‐fly ash ratio on the compressive strength of low calcium fly ash‐based geopolymer concrete. This paper also investigates the effect of delay time prior to curing on the compressive strength of geopolymer concrete. The results of the experimental investigation show that these parameters notably influence the development of the mechanical strength of the final product. The statistical investigation shows that the early compressive strength is significantly affected by the synergistic effect of a linear term of curing temperature, molarity, and activator‐to‐fly ash ratio while NaOH/Na2SiO3 ratio was found to be not so statistically significant. The numerical algorithm formulated using regression analyses were simultaneously optimized by utilizing response optimizer method. A constitutive model which represents a relationship between the compressive strength and splitting tensile strength is also proposed.

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Section: Effect Of Molarity Of Naoh Solutionsupporting

confidence: 80%

Section: Resultssupporting

confidence: 51%

See 1 more Smart Citation

A statistical investigation of different parameters influencing compressive strength of fly ash induced geopolymer concrete

Rai

Roy

Rajjak

2018

Structural Concrete

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“…And from analyzing gradient of the three graphs we find out that the effect of micro-and nano-silica is more significant than the effect of resistance grade of cement. Using Portland cement reduces concrete performance, but improves compressive strength, tensile strength, and modulus, and also, adding Portland cement decreases absorption of water and porosity [45]. From Chart 3 it can be concluded that the best combination for concrete with high strength is micro-silica (95 g) and nanosilica (38 g) and resistance grade of cement (325).…”

Section: Resultsmentioning

confidence: 99%

“…The contour graph is useful to find the optimal output value. The contour graph shows the strengths and weaknesses of each model and helps to select the optimized combination scheme for the target [45,46].…”

Section: Resultsmentioning

confidence: 99%

Optimizing Compressive Strength of Micro- and Nano-silica Concrete by Statistical Method

Zarehparvar-Shoja

Eskandari‐Naddaf

2017

CivileJournal

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In recent years, the use of nano-particles to improve the properties of concrete has created a new perspective on concrete technology. Studies in this field indicate improved concrete properties and higher strength by adding nano and micro silica particles to concrete mixes. In this regard, 12 mixing designs with different amounts of these admixtures with three types of cement strength classes (525,425,325) and 36 cubic samples (10 × 10 × 10) were designed and tested to measure compressive strength, of which we have only used 6 mixing plans in this research. The purpose of this research is to present a new method for concrete mix design by optimizing principles. Therefore, in this paper, the Taguchi statistical methods and the factorial design of the optimal mixing plan for this type of concrete are used to reduce the number of experiments to predict the optimal composition of the materials. The results obtained from the MINITAB software show that the effect of combined micro-silica and nano-silica on the compressive strength is in one direction and the effect of these two factors is more than cement strength grade of the cement and also the optimal value for micro-silica and nano-silica are estimated to have an optimum amount of micro-silica and nano-silica of 95 and 38 grams, respectively.

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Effect of cement additive on physical and mechanical properties of high calcium fly ash geopolymer mortars

Kaya

Köksal

2020

Structural Concrete

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Geopolymer mortars were produced by replacement of high calcium fly ash with cement at the percentages of 5%, 10%, 15%, 20%, 25%, and 100%. Sodium hydroxide was used as the activator and sodium/binder ratios, by weight, were 10%, 12%, 14%, 16%, 18%, and 20% in mortar mixtures. Some physical properties such as unit weight, water absorption, apparent porosity and ultrasound pulse velocity tests were performed on specimens kept in ambient temperature. Flexural and compressive strength tests were made on specimens kept in ambient temperature, and exposed to temperatures of 200°C, 400°C, 600°C, and 800°C for residual performances of mortars. After exposing of specimens to high temperatures, ultrasound pulse velocity and loss in weights were also determined for deterioration levels. An experimental design is also achieved to find optimum solutions for Na/binder and cement/fly ash ratios by using D‐optimal design method after establishing response surface models for compressive and flexural tensile strengths. The highest compressive strength of 35.65 MPa was obtained in mortar specimens containing 14% sodium at 20% cement replacement with fly ash. Similarly, residual strengths were observed higher than those of other mortar specimens at the same sodium and cement replacement ratios.

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Effect of cement addition, solution resting time and curing characteristics on fly ash based geopolymer concrete performance

Cited by 126 publications

References 13 publications

A statistical investigation of different parameters influencing compressive strength of fly ash induced geopolymer concrete

A statistical investigation of different parameters influencing compressive strength of fly ash induced geopolymer concrete

Optimizing Compressive Strength of Micro- and Nano-silica Concrete by Statistical Method

Effect of cement additive on physical and mechanical properties of high calcium fly ash geopolymer mortars

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