Effect of adding mineral additives to alkali-activated natural pozzolan paste

Bondar, Dali; Lynsdale, C.J.; Milestone, Neil B.; Hassani, N.; Ramezanianpour, Ali Akbar

doi:10.1016/j.conbuildmat.2010.12.031

Cited by 103 publications

(50 citation statements)

References 7 publications

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“…As regards the setting of pastes, a strong dependence on the amount of Ca(OH) 2 was observed so that only those mortars with 2% calcium hydroxide (replacing the porcelain stoneware powder) actually set during the first 24 h. While mortars without calcium hydroxide did not harden, the setting time for those whose calcium hydroxide contents were higher than 5% was so short that it was not possible to place samples into the mould. The presence of soluble calcium in the binding material was required to produce a stable matrix after curing, which is in agreement with [25,26], who observed that deficiencies in the CaO content of the raw material can be compensated by adding mineral additives.…”

Section: Alkali Activation Of Porcelain Stoneware Waste: Preliminarysupporting

confidence: 84%

Alkaline Activation of Ceramic Waste Materials

Reig

Tashima

Soriano

et al. 2013

Waste Biomass Valor

122

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Ceramic materials represent around 45% of construction and demolition waste, and originate not only from the building process, but also as rejected bricks and tiles from industry. Despite the fact that these wastes are mostly used as road sub-base or construction backfill materials, they can also be employed as supplementary cementitious materials, or even as raw material for alkali-activated binders. This research aimed to investigate the properties and microstructure of alkali-activated cement pastes and mortars produced from ceramic waste materials of various origins. Sodium hydroxide and sodium silicate were used to prepare the activating solution.The compressive strength of the developed mortars ranged between 22 and 41 MPa after 7 days of curing at 65ºC, depending on the sodium concentration in the solution and the water/binder ratio. These results demonstrate the possibility of using alkali-activated ceramic materials in building applications.

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Section: Alkali Activation Of Porcelain Stoneware Waste: Preliminarysupporting

confidence: 84%

Alkaline Activation of Ceramic Waste Materials

Reig

Tashima

Soriano

et al. 2013

Waste Biomass Valor

122

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“…Aluminosilicate polymer also known as geopolymer is aluminosilicate network structure that form between the reaction of solid amourphous aluminosilicate (Si-Al) with highly concentrated alkali hydroxide or silicate solution to activate reactive Si and Al [1,3,4]. This geopolymer consists of repeating tetrahedral unit (Si-O-Al-O).…”

Section: Introductionmentioning

confidence: 99%

Strength Performance of Blended Ash Based Geopolymer Mortar

2018

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Abstract.Geopolymer is a based on inorganic alumino-silicate binder system. Geopolymeric materials are formed using materials that containing silica and aluminium such as fly ash and rice husk ash, which activated by alkaline solution. This paper presents the study on the effect of replacement of SSA in RHA based geopolymer, types of curing and different molarity of NaOH used on the strength of Sewage Sludge Ash (SSA) and Rice Husk Ash (RHA) based geopolymer mortar incorporating with three (3) different mix proportions. Based geopolymer mortar was synthesized from treated sewage sludge and rice husk undergoing incineration process in producing ashes, activated with sodium silicate and sodium hydroxide solution by ratio of 2.5:1 and solution to ash ratio of 1:1. Molarity of 8M and 10M NaOH were used. The percentages of SSA replacement were 0%, 10% and 20% by weight. Compressive strength was conducted at age 7, 14 and 28 days to see the development of strength with two curing regimes, which are air curing and oven curing (60°C for 24 hours). From the research conducted, the ultimate compressive strength (6.28MPa) was obtained at zero replacement of SSA taken at 28 days of oven curing with 10M of NaOH. This shows that RHA, which is rich in silica content is enough to enhance the strength of geopolymer mortar especially with high molarity of NaOH.

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“…Some researchers have demonstrated the similarity of AASC to PC concrete over shorts periods of time in terms mechanical properties (Sakulich et al 2009;Yang et al 2009;Bondar et al 2011;Bernal et al 2012). The long term performance of AASC in terms of the micro-cracking and compressive strength development has been investigated by Collins and Sanjayan (2001).…”

Section: Introductionmentioning

confidence: 99%

Special Issue: Concrete Sustainability

Noguchi¹

2015

ACT

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Production of cement is ranking 3 rd in causes of man-made carbon dioxide emissions world-wide. Thus, in order to make concrete more sustainable one may work along one or more of the following routes; 1) Replacing cement in concrete with larger amounts of supplementary cementing materials (SCMs) than usual, 2) Replacing cement in concrete with combinations of SCMs leading to synergic reactions enhancing strength, 3) Producing leaner concrete with less cement per cubic meter utilizing plasticizers and 4) Making concrete with local aggregate susceptible to alkali silica reaction (ASR) by using cement replacements, thus avoiding long transport of non-reactive aggregate.

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Effect of adding mineral additives to alkali-activated natural pozzolan paste

Cited by 103 publications

References 7 publications

Alkaline Activation of Ceramic Waste Materials

Alkaline Activation of Ceramic Waste Materials

Strength Performance of Blended Ash Based Geopolymer Mortar

Special Issue: Concrete Sustainability

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