Impact of GGBS and strength ratio on mechanical properties of geopolymer concrete under ambient curing and oven curing

Poloju, Kiran Kumar; Srinivasu, Kota

doi:10.1016/j.matpr.2020.11.934

Cited by 28 publications

(13 citation statements)

References 9 publications

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“…Self-compacting geopolymer concrete with zero cement and zero superplasticizers cured under ambient conditions was tested to have 40 MPa compressive strength after 28 days of curing, which is comparable to that of M40 grade conventional concrete [ 18 ]. The strength of geopolymer concrete was reported to increase with an increase of curing time and a rise in temperature, as reported in several studies [ 19 , 20 , 21 ]. However, Zhang et al [ 22 ] clarified that the strength of geopolymer concrete deteriorated after exposure to an optimal curing temperature.…”

Section: Introductionsupporting

confidence: 54%

Durability Performance of Geopolymer Concrete: A Review

Wong

2022

Polymers

107

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Geopolymer concrete is produced from the geopolymerization process, in which molecules known as oligomers integrate to form geopolymer networks with covalent bonding. Its production expends less thermal energy and results in a smaller carbon footprint compared to Ordinary Portland Cement (OPC) concrete. It requires only an alkaline activator to catalyze its aluminosilicate sources such as metakaolin and fly ash, to yield geopolymer binder for the geopolymerization to take place. Because of its eco-friendly technology and practical application, current research interest is mainly concentrated on the endurance of geopolymer concrete to resist heat and chemical aggressions. As such, it is pertinent for this review article to provide critical insight into the recent progress in research on the durability of geopolymer concrete. One significant outcome of the review is that the admixture of geopolymer concrete could be blended with additives such as micro-silica and fibers such as polypropylene fibers, to enhance its durability. The review on the durability aspects of geopolymer concrete showed that it had high compressive strength at an optimal elevated temperature, low to medium chloride ion penetrability, and high resistance to acid attack and abrasion. This makes geopolymer concrete a viable candidate to replace OPC concrete in the construction industry.

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Section: Introductionsupporting

confidence: 54%

Durability Performance of Geopolymer Concrete: A Review

Wong

2022

Polymers

107

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“…There are several differences in the performance of concrete containing pozzolanic elements when exposed to high temperatures. Between 40 and 100 °C, there was strong stability and better early strength increases, followed by explicit decline and lower ultimate compressive strength than the reference [ 6 , 9 , 30 , 43 ].…”

Section: Analysis Of Compressive Strength (Cs)mentioning

confidence: 85%

“…A/B ratios also play a vital role in strength development; a recent study observed that an A/B ratio of 0.45 shows excellent mechanical performances compared with 0.30 when FA is used as binder, curing under ambient condition [ 25 , 38 , 40 , 41 ]. At the micro level study, when GGBS is combined with a higher molar concentration, a weaker interfacial transition zone (ITZ) was observed followed by a hair-line crack appeared at aggregate and geopolymer paste [ 42 , 43 ].…”

Section: Analysis Of Compressive Strength (Cs)mentioning

confidence: 99%

“…As a result, the Si/Al molar ratio may have a significant influence on the mechanical and microstructure characteristics of geopolymeric materials when they are subjected to higher temperatures. Furthermore, previous research into the thermochemistry and thermal characteristics of fly ash used well-thought-out geopolymers based on fly ash with an objective for amorphous Si/Al ratios greater than two [ 15 , 27 , 29 , 42 , 43 ]. The amorphous content of fly ash, as well as the Si/Al ratio, influenced the reaction to thermal exposure, with higher ratios offering improved responses when exposed to temperatures of up to 100 °C.…”

Section: Analysis Of Compressive Strength (Cs)mentioning

confidence: 99%

“…This was especially true above 80 °C, leading to the conclusion that the presence of alumina was beneficial in reducing thermal shrinkage and speeding up crystallization at a set temperature, as well as the extent of crystallization fillers, when combined with an Al plus Si-containing geopolymer based on metakaolin. The absence of inorganic type fillers in the microstructure might be due to a geopolymer gel covering or the particles of filler reacting in the geopolymerization kinetics, rendering them indistinguishable [ 5 , 6 , 8 , 30 , 43 ].…”

Section: Analysis Of Compressive Strength (Cs)mentioning

confidence: 99%

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Assessment of Destructive and Nondestructive Analysis for GGBS Based Geopolymer Concrete and Its Statistical Analysis

et al. 2022

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Geopolymer is the alternative to current construction material trends. In this paper, an attempt is made to produce a sustainable construction composite material using geopolymer. Ground granulated blast furnace slag (GGBS)-based geopolymer concrete was prepared and tested for different alkaline to binder ratios (A/B). The effect of various temperatures on compressive strength properties was assessed. The cubes were exposed to temperature ranging from 50 to 70 °C for a duration ranging from 2 to 10 h, and the compressive strength of the specimens was analyzed for destructive and non-destructive analysis and tested for 7, 28, and 90 days. The obtained compressive strength (CS) results were analyzed employing the probability plot (PP) curve, distribution overview curve (DOC), probability density function (PDF), Weibull, survival, and hazard function curve. Maximum compressive strength was achieved for the temperature of 70 °C and an A/B of 0.45 for destructive tests and non-destructive tests with 44.6 MPa and 43.56 MPa, respectively, on 90 days of testing. The survival and hazard function curves showed incremental distribution characteristics for 28 and 90 days of testing results with a probability factor ranging from 0.8 to 1.0.

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