Strength, permeability, and carbonation of high-performance concrete

Khan, M. Iqbal; Lynsdale, C.J.

doi:10.1016/s0008-8846(01)00641-x

Cited by 192 publications

(88 citation statements)

References 2 publications

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“…The tests for carbonation showed that with 5% incorporation of wood ash in cement resulted in reduction in depth of carbonation. With the 10%, 15% and 25% the reduction in depth was insignificant [16].…”

Section: Carbonationmentioning

confidence: 87%

Partial Replacement of Wood Ash with Ordinary Portland Cement and Foundry Sand as Fine Aggregate

Batt¹,

Garg²

2017

J Civil Environ Eng

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Wood ash is generated as residual/waste from combustion done in boilers at pulp and paper mills, steam power plants, and other thermal power generating facilities. Since wood is a renewable resource for energy and an environmentally friendly material, there is an increased requirement of using waste wood for the purpose of energy production thus leading to formation of more wood ash waste. The study focuses on incorporation of wood ash in combination with ordinary Portland cement while using it for various structural works. A critical review study in sieve analysis, consistency, and water absorption, setting time and slump tests of wood ash added to OPC will produce significant results to emphasize the detailed study process. Uncontrolled burning of saw dust to form wood ash is used as a partial replacement of cement, thereby changing its physical and chemical properties. These properties are found somewhat similar to fly ash. The concrete mixes are replaced with the amorphous wood ash as an admixture of cement having grain size less than 75 microns in proportions of 5%, 10%, 15%, 20%, 25% and 30% by weight of cement. In this Study, a research work is conducted for determining the change in workability or consistency of concrete mix, compressive strength, split tensile strength, flexural strength, etc., along with review of some durability properties. Foundry Sand is used as fine aggregate to obtain efficient results.

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Section: Carbonationmentioning

confidence: 87%

Partial Replacement of Wood Ash with Ordinary Portland Cement and Foundry Sand as Fine Aggregate

Batt¹,

Garg²

2017

J Civil Environ Eng

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“…For example, FA offsets the increase in water demand, heat of hydration (Thomas and Bamforth 1999) and alkalinity of pore solution (Shehata and Thomas 2002) resulting from addition of SF. On the other hand, SF compensates for the low early age strength (Carette and Malhotra 1983, Khan and Lynsdale 2002, Thomas and Bamforth 1999 and sensitivity to curing (with respect to development of both mechanical and durability-related properties) of FA concrete . From the economical perspective, a relatively low cost of FA counterbalances higher cost of SF.…”

Section: Indot Division Of Researchmentioning

confidence: 99%

High-Performance Concrete Bridge Decks: A Fast-Track Implementation Study Volume 2: Materials

Radlinski¹,

Olek²

2010

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IntroductionConcrete bridge decks are inherently exposed to harsh environment. They are known to undergo degradation due to numerous distresses, of which the most common are corrosion of reinforcement (caused by ingress of chloride through bulk concrete), freeze-thaw damage, shrinkage cracking (aggravating both corrosion and freeze-thaw problems) and surface scaling due to deicing salts.Recently, high performance concrete (HPC) has become widely utilized in the applications where severe environment leads to premature deterioration. The premise behind the development of HPC was to address the durability issues typical of normal concrete. HPC almost always implies incorporation of mineral admixtures, such as fly ash (FA) or silica fume (SF). These materials are added to concrete for variety of reasons, of which the most important is improvement (compared to plain ordinary portland cement (OPC) concrete) of certain durabilityrelated properties. However, there are also some downsides of utilizing them in concrete. For example, fly ash is known to reduce the early age strength and early age resistance to chloride-ion penetration, as well as resistance to salt scaling and carbonation. Furthermore, fly ash concrete has been reported to be fairly sensitive to curing conditions compared to plain cement concrete. The shortcomings of incorporating silica fume, on the other hand, include increased susceptibility to shrinkage cracking and potentially reduced resistance to freezing and thawing.In the view of the aforementioned side effects associated with the use of fly ash or silica fume in binary mixtures, the ternary cementitious systems have been introduced as a potentially viable solution to address those durability issues. Superior properties of this kind of cementitious systems are commonly attributed to so-called synergistic effect taking place when both pozzolanic materials are utilized. The intuitively obvious benefit of the use of OPC/FA/SF mixtures is that the presence of fly ash in concrete compensates for the deficiencies of silica fume, and vice versa. For example, FA offsets the increase in water demand, heat of hydration and alkalinity of pore solution resulting from addition of SF. On the other hand, SF compensates for the low early age strength and sensitivity to curing (with respect to development of both mechanical and durability-related properties of FA concrete). From the economical perspective, a relatively low cost of FA counterbalances higher cost of SF. Although a fairly large amount of research has been conducted to evaluate the properties of ternary cementitious mixtures containing fly ash and silica fume, relatively little was done with the emphasis on the durability-related issues encountered when these binder systems are used in the bridge deck concrete. Up to date, no data exists on the actual performance of ternary concrete containing class C fly ash and silica fume in bridge decks.The purpose of this research was to examine the applicability of ternary binder systems containing ordinary port...

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“…HPC mixtures generally have a low water-tocement ratio (w/c) and may contain finely ground supplementary cementitious materials, (e.g., silica fume). While the fine pore system is beneficial for increased strength [2] and reduced fluid transport [3,4], the finer pore network can lead to increased volumetric changes in sealed systems as a result of self-desiccation [5]. This volume change (autogenous shrinkage) is an issue as it can result in cracking if the concrete is restrained from shrinking freely.…”

Section: Introduction 29mentioning

confidence: 99%

Water absorption in internally cured mortar made with water-filled lightweight aggregate

Henkensiefken¹,

Castro

Bentz

et al. 2009

Cement and Concrete Research

170

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Strength, permeability, and carbonation of high-performance concrete

Cited by 192 publications

References 2 publications

Partial Replacement of Wood Ash with Ordinary Portland Cement and Foundry Sand as Fine Aggregate

Partial Replacement of Wood Ash with Ordinary Portland Cement and Foundry Sand as Fine Aggregate

High-Performance Concrete Bridge Decks: A Fast-Track Implementation Study Volume 2: Materials

Water absorption in internally cured mortar made with water-filled lightweight aggregate

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