Durability of low‑calcium fly ash based geopolymer concrete culvert in a saline environment

Pasupathy, Kirubajiny; Berndt, Marita; Sanjayan, Jay; Rajeev, Pathmanathan; Cheema, Didar Singh

doi:10.1016/j.cemconres.2017.07.010

Cited by 142 publications

(51 citation statements)

References 31 publications

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“…Testing of AAM durability in the field has generally shown results that are consistent with laboratory trials under non-accelerated or minimally-accelerated conditions; the materials that have been put into service under varying conditions have in many cases served very well, including concretes dating back to the 1950s [151,247,248], and more recent demonstration or full-scale infrastructure projects [249][250][251][252] including an airport in Australia that was constructed largely from alkali-activated concretes [253]. Such projects are essential in building stakeholder acceptance of AAM technology, and in using the experience gained to guide standards development, to ensure that the materials selected, specified and used are fully fit for purpose [254].…”

Section: Durabilitymentioning

confidence: 78%

Recent progress in low-carbon binders

Shi

Provis

2019

Cement and Concrete Research

490

131

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The development of low-carbon binders has been recognized as a means of reducing the carbon footprint of the Portland cement industry, in response to growing global concerns over CO2 emissions from the construction sector. This paper reviews recent progress in the three most attractive low-carbon binders: alkali-activated, carbonate, and belite-ye'elimite-based binders. Alkali-activated binders/materials were reviewed at the past two ICCC congresses, so this paper focuses on some key developments of alkali-activated binders/materials since the last keynote paper was published in 2015. Recent progress on carbonate and belite-ye'elimite-based binders are also reviewed and discussed, as they are attracting more and more attention as essential alternative low-carbon cementitious materials. These classes of binders have a clear role to play in providing a sustainable future for global construction, as part of the available toolkit of cements.

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Section: Durabilitymentioning

confidence: 78%

Recent progress in low-carbon binders

Shi

Provis

2019

Cement and Concrete Research

490

131

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“…As an eco-friendly material, geopolymer is usually prepared using locally available by-products (such as fly ash, soda residue, red mud and blast furnace slag, etc.) [ 11 , 12 , 13 ]. Fly ash, as one of the typical by-products, is widely used to manufacture geopolymer material.…”

Section: Introductionmentioning

confidence: 99%

Performance Optimization and Characterization of Soda Residue-Fly Ash Geopolymer Paste for Goaf Backfill: Beta-Hemihydrate Gypsum Alternative to Sodium Silicate

et al. 2020

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Solid waste soda residue (SR), as an industrial pollutant of water, air and soil environment, can be utilized to prepare the low-calcium fly ash (FFA)-based geopolymer paste activated by sodium silicate (NS) solution for goaf backfill. However, the high addition of NS produces the high cost and high strength of synthesized backfill material in the previous study. The objective of this research is to investigate the cost optimization method and performance evaluation of SR-FFA-based geopolymer backfill paste. The alkaline beta-hemihydrate gypsum (BHG) alternative to partial NS was proposed. Scanning electron microscopy (SEM), X-ray diffraction (XRD) as well as Fourier transform infrared spectrometer (FTIR) tests were performed to clarify the role of BHG and evaluate the microstructures and products of backfill pastes. The results show that 10% BHG alternative ratios effectively improve fluidity, setting time and compressive strength to satisfy the performance requirement of goaf backfill material. The gel products in the optimal backfill paste C4 with 10% BHG alternative ratios are determined as the coexistence of C-S-H gel, (N,C)-A-S-H gel and CaSO4·2H2O at 28 d. The research results can make extensive utilization of SR and FFA in cemented paste backfill to synthesize cleaner material at a larger scale.

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“…The main reaction product of the pozzolanic reaction are calcium silicate hydrate phases [36,37]. Outside land construction, ashes are used for the production of geopolymer concrete with good parameters for their use in marine construction [38]. In the face of various cement types produced with the participation of ashes, advanced research is carried out to further improve their strength using nanotechnology [39] and graphene technology [40].…”

Section: Introductionmentioning

confidence: 99%

Study on the Possibilities of Natural Use of Ash Granulate Obtained from the Combustion of Pellets from Plant Biomass

2019

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As a step towards the diversification of electricity and heat sources, the EU countries suggest the use of biomass. The combustion of biomass poses the problem of the use of ash produced in the process. There are fluctuations in the properties of energetic biomass, which results in high variability of ash obtained by combustion, especially in terms of specific conductivity (EC) (8.1–9.7 mS·cm−1), the total content of components and their bioavailability. The combustion of biomass leads to large fluctuations in the total content of carbon in the ash (13.6%–28.6%). In this way, waste material with very different biological properties and cation exchange capacity is obtained. Ash from the combustion of biomass is an alkalizing material, rich in Ca, K and Mg carbonates (4.5%). The high average bioavailability of Pb (87.4%), Cd (63.1%) and Zn (46.9%) present in the ash is an environmental problem. The mobility of these heavy metals was reduced by half by the addition of bentonite during the process of ash granulation. With high doses of ash (4.4% of the mass of substrate), there is a significant bioaccumulation of Cd in the roots of Begonia semperflorens and Thuja occidentalis (1.0–3.8 mg·kg−1). Another disturbing issue is that during the cultivation of these plants, Cr is bioaccumulated in the roots (0.5–3.8 mg·kg−1).

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Durability of low‑calcium fly ash based geopolymer concrete culvert in a saline environment

Cited by 142 publications

References 31 publications

Recent progress in low-carbon binders

Recent progress in low-carbon binders

Performance Optimization and Characterization of Soda Residue-Fly Ash Geopolymer Paste for Goaf Backfill: Beta-Hemihydrate Gypsum Alternative to Sodium Silicate

Study on the Possibilities of Natural Use of Ash Granulate Obtained from the Combustion of Pellets from Plant Biomass

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