Utilization of fly ash with silica fume and properties of Portland cement–fly ash–silica fume concrete

Nochaiya, Thanongsak; Wongkeo, Watcharapong; Chaipanich, Arnon

doi:10.1016/j.fuel.2009.10.003

Cited by 351 publications

(166 citation statements)

References 11 publications

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“…On one hand, for slag this result is related to the hydration reactions of this addition, which form new CSH phases, entailing a more refined pore network [7,8,10]. On the other hand, the fly ash has pozzolanic activity, which means that it reacts with portlandite produced along the clinker hydration, giving rise to the formation of additional hydrated products, thus increasing the refinement of the pore network of mortars and concretes [9][10][11]. The abovementioned pore refinement produced by both additions improves the performance of cementitious materials, for example their chloride ingress resistance [12][13][14][15][16][17] and their permeability [18].…”

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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“…One of the approaches studied is the incorporation of very small size pozzolanic materials. In particular, microsilica has been used to improve the early age strength properties of concrete containing fly ash [13][14][15]. Ultra fine fly ash (UFFA) is a recently developed material.…”

Section: Introductionmentioning

confidence: 99%

Behaviour of a Sustainable Concrete in Acidic Environment

Barbhuiya

Kumala

2017

Sustainability

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Sustainability has become one of the most important considerations in building design and construction in recent years. Concrete is susceptible to acid attack because of its alkaline nature. The socioeconomic losses associated with infrastructure deterioration due to acid attack exceed billions of dollars all around the world. An experimental investigation was carried out to study the behaviour of sustainable concrete in 3% sulphuric acid and 1.5% nitric acid environment in which cement was replaced by a combination of fly ash and ultra fine fly ash. It was found that the compressive strength loss of concrete in these acid environments was the minimum in which cement was replaced by 30% fly ash and 10% ultra fine fly ash. This mix also showed the lowest mass loss when exposed to these acids.

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“…One of the important factors is the rate of admixture in concrete, which we are referring to as micro-silica and nanosilica [5]. Due to the effects of using Nano-silica in concrete, including improving microstructures, reducing permeability, reducing porosity and increasing compressive strength it can be concluded that the use of nano-silica is valuable that Collapardi et al confirm this [6]. In recent years, the use of nano-silica to improve the properties of concrete has created a broad perspective on concrete technology [7].…”

Section: Introductionmentioning

confidence: 89%

Optimizing Compressive Strength of Micro- and Nano-silica Concrete by Statistical Method

Zarehparvar-Shoja

Eskandari‐Naddaf

2017

CivileJournal

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In recent years, the use of nano-particles to improve the properties of concrete has created a new perspective on concrete technology. Studies in this field indicate improved concrete properties and higher strength by adding nano and micro silica particles to concrete mixes. In this regard, 12 mixing designs with different amounts of these admixtures with three types of cement strength classes (525,425,325) and 36 cubic samples (10 × 10 × 10) were designed and tested to measure compressive strength, of which we have only used 6 mixing plans in this research. The purpose of this research is to present a new method for concrete mix design by optimizing principles. Therefore, in this paper, the Taguchi statistical methods and the factorial design of the optimal mixing plan for this type of concrete are used to reduce the number of experiments to predict the optimal composition of the materials. The results obtained from the MINITAB software show that the effect of combined micro-silica and nano-silica on the compressive strength is in one direction and the effect of these two factors is more than cement strength grade of the cement and also the optimal value for micro-silica and nano-silica are estimated to have an optimum amount of micro-silica and nano-silica of 95 and 38 grams, respectively.

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Utilization of fly ash with silica fume and properties of Portland cement–fly ash–silica fume concrete

Cited by 351 publications

References 11 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

Behaviour of a Sustainable Concrete in Acidic Environment

Optimizing Compressive Strength of Micro- and Nano-silica Concrete by Statistical Method

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