Flexural strength of plain and fibre-reinforced boroaluminosilicate geopolymer

Nazari, Ali; Maghsoudpour, Ali; Sanjayan, Jay

doi:10.1016/j.conbuildmat.2014.12.002

Cited by 45 publications

(15 citation statements)

References 26 publications

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“…There is a decrease in compressive strength and an increase in flexural strength and splitting tensile strength when the volume fraction of fiber increases. The influence of steel fiber on geopolymer concrete composites using boroaluminosilicate was also found by yje research of Nazari et al [12] and Al-mashhadani et al [13]. Their results indicated that there was good adhesion between steel fiber, geopolymeric paste, and mortar.…”

Section: Introductionmentioning

confidence: 57%

Assessment of Performance of Fiber Reinforced Geopolymer Composites by Experiment and Simulation Analysis

et al. 2019

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In this work, the experimental and simulation analysis of the performance of geopolymer composites reinforced with steel fiber and polypropylene fiber is investigated. By embedding hooked end steel fiber and polypropylene fiber with various volume fractions of 0%, 0.5%, 1%, 1.5% to the geopolymer concrete mixture, the mechanical behavior was enhanced significantly through experimental results. The compressive strength was improved 26% with 0.5% of polypropylene fiber and 46% with 1% of hooked end steel fiber while the increment of splitting tensile strength was 12% and 28%, respectively. The flexural strength of specimens using two fiber types was also improved when compared with the non-fiber geopolymer concrete. The highest increment obtained with 1.5% of fiber volume content was from 26% to 42%. The compressive performance and flexural performance of fiber-reinforced geopolymer concrete were also better than specimens without fiber, with a higher load carrying capacity, higher stress, higher toughness and smaller strain. Using hooked end steel fiber resulted in better mechanical strength than using polypropylene fiber, and the presence of fibers is an important factor related to the strength improvements. A finite element analysis was modeled by the ANSYS program, and this showed that the load–deflection response and crack patterns also agreed quite well with experimental results.

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Section: Introductionmentioning

confidence: 57%

Assessment of Performance of Fiber Reinforced Geopolymer Composites by Experiment and Simulation Analysis

et al. 2019

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“…The addition of borax of 10% by mass of fly ash increased the compressive strength of geopolymer when compared to those without borax. The use of borax to replace sodium silicate as the alkaline activator was reported by Nazari et al [14]. Borax was used together with NaOH solution for the alkaline activator, whereas the use of borax was about 35%, by mass, of fly ash.…”

Section: Introductionmentioning

confidence: 99%

The Use of Borax in Deterring Flash Setting of High Calcium Fly Ash Based Geopolymer

Antoni

Wijaya

Satria

et al. 2016

MSF

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Geopolymer that was made with high CaO content fly ash was found to have higher compressive strength than the low CaO fly ash, using the same mixture composition. This effect could be due to the physico-chemical properties of the fly ash, in respect to its particle size or the chemical composition. Although it was not widely published, the occurrence of flash setting of geopolymer was known to occur when using high CaO content fly ash as the precursor. Geopolymer paste may solidify within minutes after the addition of alkali activators, making it very difficult to cast in big volume. This paper investigate the effect of borax addition to the high calcium fly ash-based geopolymer mixture to reduce the occurrence of flash setting. It was found that the setting time can be extended significantly, with the addition of 5% borax, by mass, of fly ash. The addition of borax also have positive effect on increasing the compressive strength of geopolymer.

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“…After curing for 7 days and 28 days, the flexural strength of samples reached 5.85 MPa and 6.68 MPa, respectively. For the toughness of geopolymer, the flexural strength was an important evaluation criterion for the mechanical properties of geopolymer, and it was meaningful to discuss the compressive–flexural ratio under the condition of the same flexural strength [ 28 , 29 ]. Therefore, GBFS/fly ash mass ratio of 1:1 was selected as the object of further research.…”

Section: Resultsmentioning

confidence: 99%

Improving the Mechanical Properties of Fly Ash-Based Geopolymer Composites with PVA Fiber and Powder

et al. 2022

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In this work, polyvinyl alcohol (PVA) fiber and powder were added to geopolymer composites to toughen fly ash-based geopolymer, and their different toughening mechanisms were revealed. Firstly, different contents of active granulated blast furnace slag (GBFS) were added to the geopolymer to improve the reactivity of the GBFS/fly ash-based geopolymer, and the best ratio of GBFS and fly ash was determined through experiments testing the mechanical properties. Different contents of PVA powders and fibers were utilized to toughen the geopolymer composites. The effect of the addition forms and contents of PVA on the mechanical properties, freeze–thaw cycle resistance, and thermal decomposition properties of geopolymer composites were systematically studied. The results showed that the toughening effect of PVA fiber was better than that of PVA powder. The best compressive strength and flexural strength of geopolymer composites toughened by PVA fiber were 41.11 MPa and 8.43 MPa, respectively. In addition, the composition of geopolymer composites was explored through microstructure analysis, and the toughening mechanisms of different forms of PVA were explained. This study provided a new strategy for the toughening of geopolymer composites, which can promote the low-cost and efficient application of geopolymer composites in the field of building materials.

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Flexural strength of plain and fibre-reinforced boroaluminosilicate geopolymer

Cited by 45 publications

References 26 publications

Assessment of Performance of Fiber Reinforced Geopolymer Composites by Experiment and Simulation Analysis

Assessment of Performance of Fiber Reinforced Geopolymer Composites by Experiment and Simulation Analysis

The Use of Borax in Deterring Flash Setting of High Calcium Fly Ash Based Geopolymer

Improving the Mechanical Properties of Fly Ash-Based Geopolymer Composites with PVA Fiber and Powder

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