Factores que afectan al desarrollo inicial de resistencias a compresión en hormigones de ceniza volante activados alcalinamente (sin OPC)

Fernández-Jiménez, Ana; Palomo, A.

doi:10.3989/mc.2007.v57.i287.53

Cited by 16 publications

(1 citation statement)

References 14 publications

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“…In general, the process of FA geopolymerisation requires thermal curing to achieve favourable properties [13][14][15][16]. Some studies recommend temperatures between 60 °C and 80 °C [17] and curing times of up to 96 h [18], although the quality of FA can be appropriate (less than 1% level of unburned material).…”

Section: Introductionmentioning

confidence: 99%

Geopolymeric concretes based on fly ash with high unburned content

Valencia-Saavedra

Gutiérrez

Gordillo

2018

Construction and Building Materials

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Section: Introductionmentioning

confidence: 99%

Geopolymeric concretes based on fly ash with high unburned content

Valencia-Saavedra

Gutiérrez

Gordillo

2018

Construction and Building Materials

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Effects of Bio-Based Plasticizers, Made From Starch, on the Properties of Fresh and Hardened Metakaolin-Geopolymer Mortar: Basic Investigations

Tutal

Partschefeld

Schneider

et al. 2020

Clays and clay miner.

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Conventional superplasticizers based on polycarboxylate ether (PCE) show an intolerance to clay minerals due to intercalation of their polyethylene glycol (PEG) side chains into the interlayers of the clay mineral. An intolerance to very basic media is also known. This makes PCE an unsuitable choice as a superplasticizer for geopolymers. Bio-based superplasticizers derived from starch showed comparable effects to PCE in a cementitious system. The aim of the present study was to determine if starch superplasticizers (SSPs) could be a suitable additive for geopolymers by carrying out basic investigations with respect to slump, hardening, compressive and flexural strength, shrinkage, and porosity. Four SSPs were synthesized, differing in charge polarity and specific charge density. Two conventional PCE superplasticizers, differing in terms of molecular structure, were also included in this study. The results revealed that SSPs improved the slump of a metakaolin-based geopolymer (MK-geopolymer) mortar while the PCE investigated showed no improvement. The impact of superplasticizers on early hardening (up to 72 h) was negligible. Less linear shrinkage over the course of 56 days was seen for all samples in comparison with the reference. Compressive strengths of SSP specimens tested after 7 and 28 days of curing were comparable to the reference, while PCE led to a decline. The SSPs had a small impact on porosity with a shift to the formation of more gel pores while PCE caused an increase in porosity. Throughout this research, SSPs were identified as promising superplasticizers for MK-geopolymer mortar and concrete.

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