Sorptivity and strength of air-cured and water-cured PC–PFA–MK concrete and the influence of binder composition on carbonation depth

Bai, Jiping; Wild, S.; Sabir, B. B.

doi:10.1016/s0008-8846(02)00872-4

Cited by 86 publications

(37 citation statements)

References 11 publications

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“…In their study, it was also reported that the relative sorptivity values clearly reflected the strength values whereby the lowest sorptivity values had the highest strength except when the replacement level was 40 % (Bai et al 2002). This is quite contrary to the results obtained in the present investigation wherein the lowest value of permeability of MK15 did not exhibit the highest compressive strength for the w/b ratio studied.…”

Section: Water Permeabilitycontrasting

confidence: 85%

“…In another study, according to Bai et al (2002), the decrease in sorptivity (indirect measure of permeability of concrete) is due to the influence of particle packing on the capillary pore structure wherein a wide distribution of MK particle sizes exists resulting in a denser packing than the mixtures with cement only, thus reducing the sorptivity. In their study, it was also reported that the relative sorptivity values clearly reflected the strength values whereby the lowest sorptivity values had the highest strength except when the replacement level was 40 % (Bai et al 2002).…”

Section: Water Permeabilitymentioning

confidence: 99%

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Effect of Metakaolin Content on the Properties of High Strength Concrete

Dinakar

Sahoo

Sriram

2013

Int J Concr Struct Mater

227

104

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This study presents the effect of incorporating metakaolin (MK) on the mechanical and durability properties of high strength concrete for a constant water/binder ratio of 0.3. MK mixtures with cement replacement of 5, 10 and 15 % were designed for target strength and slump of 90 MPa and 100 ± 25 mm. From the results, it was observed that 10 % replacement level was the optimum level in terms of compressive strength. Beyond 10 % replacement levels, the strength was decreased but remained higher than the control mixture. Compressive strength of 106 MPa was achieved at 10 % replacement. Splitting tensile strength and elastic modulus values have also followed the same trend. In durability tests MK concretes have exhibited high resistance compared to control and the resistance increases as the MK percentage increases. This investigation has shown that the local MK has the potential to produce high strength and high performance concretes.

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Section: Water Permeabilitycontrasting

confidence: 85%

Section: Water Permeabilitymentioning

confidence: 99%

Effect of Metakaolin Content on the Properties of High Strength Concrete

Dinakar

Sahoo

Sriram

2013

Int J Concr Struct Mater

227

104

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“…Adding approximately 10-15% MK raises reinforcing steel corrosion resistance (91,92). The presence of MK reduces chloride ion diffusion substantially in blended cement concretes (88,90,(93)(94)(95), while contradictory results have been reported for its performance in environments containing CO 2 (96,97). Mejía et al (98) observed that the carbonation depth was slightly shallower in 28-day MK-containing specimens than in concretes with no additions, and claimed that at longer curing times the carbonation rate declined; Vejmelková et al (99) likewise found that MK-blended materials exhibited higher carbonation resistance.…”

Section: Adición De Materiales Mineralesmentioning

confidence: 99%

“…Mejía et al (98) observed that the carbonation depth was slightly shallower in 28-day MK-containing specimens than in concretes with no additions, and claimed that at longer curing times the carbonation rate declined; Vejmelková et al (99) likewise found that MK-blended materials exhibited higher carbonation resistance. Studying concretes containing ternary cements (OPC with FA and MK as pozzolanic additions), Bai et al (96) reported that the shallowest carbonation depth was found in specimens containing MK. ASTM standard C618 (87) lays down recommendations on the use of MK, one of the natural pozzolans, in cementitious systems.…”

Section: Adición De Materiales Mineralesmentioning

confidence: 99%

Durabilidad del hormigón armado expuesto a condiciones agresivas

Aguirre¹,

Gutiérrez²

2013

Mater. construcc.

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Reinforced concrete is the most widely used construction material in the world. The combination of high compressive strength, afforded by concrete and, and the excellent mechanical properties that characterise steel make it an ideal composite for all manner of structures. One of the main weaknesses of this material, however, is that when the concrete is exposed to aggressive environments, in particular high concentrations of chloride ions or carbon dioxide, reinforcing steel corrodes, shortening service life. This article reviews the state of the art on concrete durability, along with the conditions that affect its useful life by inducing reinforcing steel corrosion. It also discusses the prevention and control methods, in particular electrochemical prevention and rehabilitation techniques, that have been developed to mitigate the problem.Keywords: reinforced concrete; steel corrosion; mineral additions; electrochemical rehabilitation. RESUMENEl hormigón armado se ha convertido en el material más utilizado a nivel mundial en el sector de la construcción. La combinación de las altas prestaciones a resistencia a la compresión que ofrece el hormigón y las excelentes propiedades mecánicas del acero lo hacen el material compuesto ideal para aplicaciones estructurales. Sin embargo, uno de los mayores problemas que afecta la vida útil del hormigón es la corrosión del acero de refuerzo, la cual se presenta cuando el hormigón se encuentra expuesto a ambientes agresivos, en especial frente a la exposición a iones cloruros y/o dióxido de carbono. Este trabajo revisa el estado del conocimiento con respecto a la durabilidad del hormigón enfatizando en los fenóme-nos que afectan su durabilidad y generan la corrosión del acero de refuerzo, adicionalmente se incluyen los métodos de prevención y control que se han desarrollado para mitigar el problema, en particular los relacionados con las técnicas electroquímicas de prevención y rehabilitación. INTRODUCTIONVersatility and low cost have made concrete one of the world's most popular construction materials (1, 2). This ceramic material is characterised by high compressive strength, although it is prone to cracking under other types of mechanical stress such as bending and tensile forces, torque and shear. That weakness led to the advent of reinforced concrete, a combination of concrete and structural steel widely used to build bridges, buildings in general and skyscrapers in particular, tunnels and a host of other structures. One of the most important features of concrete, in addition to its mechanical properties, is its durability, which is associated with the inservice life of structures exposed to certain conditions or environments (3, 4). More specifically, reinforcing steel corrosion has been identified as the main weakness of reinforced concrete (5). This paper discusses the main types of concrete deterioration, including the processes that contribute to steel corrosion, and the respective prevention and control methods, such as the use of inhibitors and coatings, ...

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“…The sorptivity of the samples was measured in accordance with BS EN 480-5:2005 [31] and as used in other studies [32][33][34][35]. The test set up shown in Figure 2 involved supporting block samples on a wire-mesh platform immersed in water.…”

Section: Sorptivity Testsmentioning

confidence: 99%

Use of Oil Drill Cuttings as an Alternative Raw Material in Sandcrete Blocks

Mohammed

Cheeseman

2011

Waste Biomass Valor

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This research has investigated the use of waste oil drill cuttings treated by thermal desorption in sandcrete, a major construction material used throughout Nigeria and much of West Africa. Sandcrete samples were prepared using a sand to cement ratio of 6:1. The results show that replacing up to 50 wt.% of sand by treated oil drill cuttings produced sandcrete with reduced water absorption and reduced sorptivity, increased density and reduced thermal conductivity. In addition, the compressive strengths of samples containing oil drill cuttings were comparable to control samples. The work demonstrates the potential for the beneficial reuse of waste oil drill cuttings treated by thermal desorption in the production of sandcrete blocks with improved properties.

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Sorptivity and strength of air-cured and water-cured PC–PFA–MK concrete and the influence of binder composition on carbonation depth

Cited by 86 publications

References 11 publications

Effect of Metakaolin Content on the Properties of High Strength Concrete

Effect of Metakaolin Content on the Properties of High Strength Concrete

Durabilidad del hormigón armado expuesto a condiciones agresivas

Use of Oil Drill Cuttings as an Alternative Raw Material in Sandcrete Blocks

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