How to control the geopolymer setting time with the alkaline silicate solution

Arnoult, M.; Perronnet, M.; Autef, Alexandre; Rossignol, Sylvie

doi:10.1016/j.jnoncrysol.2018.02.036

Cited by 68 publications

(46 citation statements)

References 27 publications

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“…The reaction is normally performed in the concentrated alkali solution . It was found that alkaline ratio and annealing effected on the geopolymerization and characteristics of GP products. Recently, GP was prepared by mixing fly ash with 10 M NaOH and Na 2 SiO 3 solution.…”

Section: Introductionmentioning

confidence: 99%

Mechanical, thermal, morphological, and curing properties of geopolymer filled natural rubber composites

Yangthong

Pichaiyut

Jumrat

et al. 2018

J of Applied Polymer Sci

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The main objective of this work was to investigate influence of natural rubber (NR) types on mechanical, thermal, morphological, and curing properties together with relaxation behavior of geopolymer filled NR composites with and without bis(triethoxysilylpropyl) tetrasulfide (TESPT) silane coupling agent. Three alternative types of NR: unmodified NR, and epoxidized NR with 25 (ENR-25) or 50 mol % epoxide (ENR-50) were exploited. Rubber compounds filled with GP particles were prepared in an internal mixer at 60 C and 130-150 C for the ones with and without TESPT, respectively. It was found that incorporation of GP significantly affected cure characteristics and mechanical properties of the rubber composites. That is, decreasing cure time was observed from 11.6, 3.2, and 7.0 min in gum NR, ENR-25, and ENR-50 to 6.9, 2.1, and 5.0 min in NR/GP, ENR-25/GP, and ENR-50/GP compounds, respectively. Furthermore, the ENR-25/GP and ENR-50/GP composites showed finely dispersed GP particles which indicate high fillerrubber interactions. The in situ silanization with TESPT in rubber composites enhanced the mechanical properties of NR/GP and ENR-25/GP composites but no such enhancement was found in the ENR-50/GP composite. This matched the observations of Payne effect, maximum tan δ, and stress relaxation properties of the composites. We found that the ENR-25/GP composites exhibited the best overall properties.

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Section: Introductionmentioning

confidence: 99%

Mechanical, thermal, morphological, and curing properties of geopolymer filled natural rubber composites

Yangthong

Pichaiyut

Jumrat

et al. 2018

J of Applied Polymer Sci

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“… Correlating η [Si/(Na+Al)] to setting time of GPC: ( a ) setting time vs. η [Si/(Na+Al)] in this study alongside the reported data; ( b ) setting time vs. η [Si/(Na+Al)] reported in previous literature [ 48 ]. …”

Section: Figurementioning

confidence: 56%

Protective Geopolymer Coatings Containing Multi-Componential Precursors: Preparation and Basic Properties Characterization

et al. 2020

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This paper presents an experimental investigation on geopolymer coatings (GPC) in terms of surface protection of civil structures. The GPC mixtures were prepared with a quadruple precursor simultaneously containing fly ash (FA), ground granulated blast-furnace slag (GBFS), metakaolin (MK), and Portland cement (OPC). Setting time, compressive along with adhesive strength and permeability, were tested and interpreted from a perspective of potential applications. The preferred GPC with favorable setting time (not shorter than 120 min) and desirable compressive strength (not lower than 35 MPa) was selected from 85 mixture formulations. The results indicate that balancing strength and setting behavior is viable with the aid of the multi-componential precursor and the mixture design based on total molar ratios of key oxides or chemical elements. Adhesive strength of the optimized GPC mixtures was ranged from 1.5 to 3.4 MPa. The induced charge passed based on a rapid test of coated concrete specimens with the preferred GPC was 30% lower than that of the uncoated ones. Setting time of GPC was positively correlated with η[Si/(Na+Al)]. An abrupt increase of setting time occurred when the molar ratio was greater than 1.1. Compressive strength of GPC was positively affected by mass contents of ground granulated blast furnace slag, metakaolin and ordinary Portland cement, and was negatively affected by mass content of fly ash, respectively. Sustained seawater immersion impaired the strength of GPC to a negligible extent. Overall, GPC potentially serves a double purpose of satisfying the usage requirements and achieving a cleaner future.

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“…The volume fraction of fiber and matrix as the function of temperature was evaluated by the simple rule of mixture. The survival strategy of fiber with respect to temperature as well as matrix behavior determines the overall strategies of the composite at higher temperature [23, 24]. Also, the developing of cracks, voids, damage, breakage of the fiber during exposure to high temperature contributes towards sustainability of composite at a respective temperature [25, 26].…”

Section: Resultsmentioning

confidence: 99%

Effect of high temperature on the microstructural evolution of fiber reinforced geopolymer composite

Samal

2019

Heliyon

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Physical evolution of geopolymeric minerals derived from metakaolin and synthesized with sodium, mixed-alkali and potassium activating solutions (Na- K) during thermal exposure. The geopolymer composites were prepared with 40 V% of fiber reinforcement such as carbon, E-glass, and basalt at the direction of in plain. Fiber reinforced geopolymer composites were exposed to the room and elevated temperatures inside the oven at air medium for a period of 30 min. The durability of the composites and internal structures with surface microstructures were examined after high temperature exposures. According to the results, geopolymer implied a prominent influence on the thermal shrinkage with the increasing of Si/Al ratios. This was attributed to the densification caused by reduction in porosity during dehydroxylation and sintering. In the case of carbon fiber reinforced composite shows transition in strength after 600 °C due to the oxide protective layer that increases the flexural strength and toughness of the composite. The flexural strength of the carbon reinforced composite increases from 17.8 to 55.8 MPa at 1000 °C. Whereas, E-glass reinforced composite shows expansion in a matrix with cage like structure helps in the sliding mechanism of fiber within the matrix, thus strength reduces towards high temperature. In case of basalt reinforces composite complete conversions into a ceramic like structure after exposure to high temperature. As a result, the crystalline nature of ceramic assists in toughened the composite structure with a brittle nature.

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How to control the geopolymer setting time with the alkaline silicate solution

Cited by 68 publications

References 27 publications

Mechanical, thermal, morphological, and curing properties of geopolymer filled natural rubber composites

Mechanical, thermal, morphological, and curing properties of geopolymer filled natural rubber composites

Protective Geopolymer Coatings Containing Multi-Componential Precursors: Preparation and Basic Properties Characterization

Effect of high temperature on the microstructural evolution of fiber reinforced geopolymer composite

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