Carbonation of a blended slag-fly ash geopolymer concrete in field conditions after 8 years

Pasupathy, Kirubajiny; Berndt, Marita; Castel, Arnaud; Sanjayan, Jay; Rajeev, Pathmanathan

doi:10.1016/j.conbuildmat.2016.08.078

Cited by 123 publications

(40 citation statements)

References 26 publications

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“…In this regard, there are not too many experimental works where slag and fly ash cement-based materials had been hardened under real in-situ environments [12,13,[19][20][21][22][23][24][25][26] and considering their results, those materials showed different behaviour as a function of the climate characteristics of the place in which the specimens were located, although the majority of them coincide in the fact that the use of both additions is particularly adequate for marine structures [13,23,27,28].…”

Section: Introductionmentioning

confidence: 99%

Effects of Environment in the Microstructure and Properties of Sustainable Mortars with Fly Ash and Slag after a 5-Year Exposure Period

et al. 2018

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Nowadays, getting a more environmentally sustainable cement production is one of the main goals of the cement industry. In this regard, the use of active additions, like fly ash and ground granulated blast-furnace slag, has become very popular. The behaviour, in the short-term, of cement-based materials with those additions is well-known when their hardening is produced under optimum conditions. However, real structures are exposed to different environments during long periods, which could affect the development of microstructures and the service properties of cementitious materials. The objective of this work is to analyse the effects in the long-term (up to 5 years approximately) produced by the exposure to different non-optimum laboratory conditions in the microstructure, mechanical and durability properties of mortars made with slag and fly ash commercial cements. Their performance was compared to that observed for ordinary Portland cement (OPC) mortars. The microstructure has been analysed using mercury intrusion porosimetry. The effective porosity, the capillary suction coefficient, the chloride migration coefficient and mechanical strengths were analysed too. According to the results, mortars prepared using slag and fly ash sustainable commercial cements, exposed to non-optimum conditions, show a good performance after 5-years hardening period, similar or even better than OPC mortars.

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Section: Introductionmentioning

confidence: 99%

Effects of Environment in the Microstructure and Properties of Sustainable Mortars with Fly Ash and Slag after a 5-Year Exposure Period

et al. 2018

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“…Fig. 10 Flexural test of fly ash-based geopolymer concrete beams cured in seawater and room temperature-adapted from Bayuaji, et al 112 Pasupathy et al investigated the degrees of carbonation in two adjacent reinforced blended fly ash/slag geopolymer concrete slabs after 8-year exposure to atmospheric carbonation. Different mix compositions of geopolymer concrete were used for casting these two types of slab: a combination of 25% slag and 75% fly ash activated by a mixture of potassium and sodium hydroxide, and additional sodium silicate was used for Type 1 slab, while 30% slag and 70% fly ash with only a mixture of potassium and sodium hydroxide as activator was used for Type 2 slab.…”

Section: Reinforced Alkali-activated Concrete Beams 106mentioning

confidence: 99%

A Review on Durability of Alkali-activated System from Sustainable Construction Materials to Infrastructures

Li¹,

Tang²,

Tam³

et al. 2020

ES Mater.Manuf.

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With growing concerns for greenhouse gas emissions, alkali-activated materials (AAMs) have received significant attention due to the benefit of low carbon footprint. In the process of promoting large-scale and commercialized applications of AAMs, one of the most significant concerns is the long-term durability. This work presents a critical review on the durability performance of alkali-activated system. At the material level, this work reviews factors influencing the mass transport properties of AAMs, and effects of a number of factors such as chemical activators, raw materials, curing regimes, and exposure environments on the durability of AAMs subjected to both physically and chemically induced deterioration. At the structure level, the durability performance of structures made from AAMs, including beam, slab, box culvert, and repairing materials and protection coating under extreme conditions are reviewed. The review indicates that AAMs have potentials to manufacture durable materials by appropriate selection of raw materials, chemical activators and optimization of mixing design. Furthermore, perspectives are proposed for the further study on the durability of AAMs at both material and structure levels. The related results are of interest to the research community as well as to the stakeholders of AAMs industries who seek sustainability in their products.

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“…For the construction of building structures, woven fabrics are usually the choice to save weight, minimize resin void size, and maintain fiber orientation during the fabrication process. In general, impact events cause combinations of damages [16]. The resulting damage may include significant fiber failure, matrix cracking, delamination, and debonded elements.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Internal Structure of Fiber Reinforced Geopolymer Composite under Mechanical Impact: A Micro Computed Tomography (µCT) Study

et al. 2019

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The internal structure of fiber reinforced geopolymer composite was investigated by microfocus X-ray computed tomography (µCT) under mechanical impact. µCT is a non-destructive, multi approach technique for assessing the internal structures of the impacted composites without compromising their integrity. The three dimensional (3D) representation was used to assess the impact damage of geopolymer composites reinforced with carbon, E-glass, and basalt fibers. The 3D representations of the damaged area with the visualization of the fiber rupture slices are presented in this article. The fiber pulls out, and rupture and matrix damage, which could clearly be observed, was studied on the impacted composites by examining slices of the damaged area from the center of the damage towards the edge of the composite. Quantitative analysis of the damaged area revealed that carbon fabric reinforced composites were much less affected by the impact than the E-glass and basalt reinforced composites. The penetration was clearly observed for the basalt based composites, confirming µCT as a useful technique for examining the different failure mechanisms for geopolymer composites. The durability of the carbon fiber reinforced composite showed better residual strength in comparison with the E-glass fiber one.

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Carbonation of a blended slag-fly ash geopolymer concrete in field conditions after 8 years

Cited by 123 publications

References 26 publications

Effects of Environment in the Microstructure and Properties of Sustainable Mortars with Fly Ash and Slag after a 5-Year Exposure Period

Effects of Environment in the Microstructure and Properties of Sustainable Mortars with Fly Ash and Slag after a 5-Year Exposure Period

A Review on Durability of Alkali-activated System from Sustainable Construction Materials to Infrastructures

Investigation of the Internal Structure of Fiber Reinforced Geopolymer Composite under Mechanical Impact: A Micro Computed Tomography (µCT) Study

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