Durability of the Ultra High Performances Concrete containing metakaolin

Tafraoui, Ahmed; Escadeillas, Gilles; Vidal, Thierry

doi:10.1016/j.conbuildmat.2016.02.169

Cited by 174 publications

(66 citation statements)

References 22 publications

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“…For example, the addition of RHA (Huang et al 2017) or treated bagasse ash (Rajasekar et al 2018) was found to reduce the sorptivity of UHPC. Ternary blended mixtures of cement, silica fume and metakaolin might increase the water capillary absorption compared to conventional UHPFRC with cement + silica fume according to Tafraoui et al (2016). However, the differences observed in these sorptivity results are not significant to cause a fundamentally different durability.…”

Section: Introductionmentioning

confidence: 94%

Capillary Transport of Water in Cracked and Non-cracked UHPFRC Specimens

Matos

Nunes

Aguiar

2019

ACT

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The primary goal of the present paper is to investigate the influence of cracking on water transport by capillary suction of UHPFRC. Prismatic specimens were firstly loaded under four-point bending up to specific crack open displacement (COD). Target COD, under loading, was varied between 200 and 400 μm, in steps of 50 μm. After unloading, a COD recovery was observed with residual COD ranging between 116-334 µm and 75-248 μm for UHPFRC-1.5% and UHPFRC-3.0% specimens, respectively. The crack pattern created was characterised (number of cracks and crack width) before capillarity testing. Sorptivity results of cracked UHPFRC-1.5% and UHPFRC-3% specimens remained in the range of 0.024 to 0.044 mg/(mm 2 .min 0.5), which are about 2 to 4 times higher than the sorptivity results of noncracked UHPFRC specimens. However, the maximum sorptivity observed on cracked UHPFRC is relatively low as compared to typical sorptivity results found in good quality conventional concrete or engineered cementitious composites (ECC).

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Section: Introductionmentioning

confidence: 94%

Capillary Transport of Water in Cracked and Non-cracked UHPFRC Specimens

Matos

Nunes

Aguiar

2019

ACT

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“…Tafraoui, Escadeillas, and Vidal [10] confirmed that UHPCs containing 25% metakaolin have good durability performance in terms of oxygen permeability, diffusion and chloride ion migration, and carbonation. Muhd Norhasri et al [7] found that the inclusion of up to 10% nano-metakaolin in UHPC exhibited low workability in the fresh-state while having early compressive strength similar to plain UHPC, but which increased gradually with time.…”

Section: Synergistic Behaviour Of Metakaolin and Its Wider Range Of Umentioning

confidence: 82%

“…Its application as an SCM has captured the attention of researchers due to its high effectiveness in enhancing concrete properties. Likewise, its potential in producing more cohesive and dense concrete, provided that a proper dosage of superplasticiser is used, has generally contributed to its popularity in innovative concretes (lightweight concrete, high-strength concrete, Ultra-High Performance Concrete (UHPC), and Self-Compacting Concrete (SCC)) [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Use of metakaolin as supplementary cementitious material in concrete, with focus on durability properties

Bakera¹,

Alexander

2019

RILEM Tech Lett

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Numerous research efforts on metakaolin as a supplementary cementitious material (SCM) have been undertaken in the past 20 years. This material, while relatively expensive mainly due to low production volumes worldwide, nevertheless has a significantly lower production cost than Portland cement. However, industry remains tentative in considering metakaolin in concrete. This paper takes the view that industry should consider investing in the production and application of metakaolin in appropriate concrete projects, particularly in aggressive environments where plain Portland cement may be inadequate, and where other SCMs may not readily be available. The main contribution of the paper is a global review of recent studies on the use of metakaolin in different types of concrete. This international experience is then compared with results from a study on the durability performance of metakaolin concrete using local materials in the Western Cape province of South Africa, as a means of concrete performance improvement. The study investigates concrete durability properties: penetrability (sorptivity, permeability, conductivity and diffusion), mitigation of Alkali-Silica Reaction (ASR), and carbonation resistance. The concretes were prepared with three water-binder ratios (0.4, 0.5 and 0.6), and with metakaolin replacement levels of 0% (control), 10%, 15% and 20%. Performance results show that, with increasing metakaolin content, the transport properties of concrete are considerably improved, ASR expansion due to a highly reactive local aggregate decreases to non-deleterious levels, while no detrimental effect on carbonation is observed. Thus, metakaolin could serve as a valuable SCM to enhance the durability performance of concrete in local aggressive environments.

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“…The formulation used is that of the author [14] presented in The model obtained after the release from the mold is immersed in water during 3 days then treated in a drying oven with a temperaturede150°C during 3days in order to increase the mechanical properties.…”

Section: Formulationmentioning

confidence: 99%

Research of the Parameters of Cut For the Machining of the New Concretes

al.,¹

2017

IJMPERD

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Durability of the Ultra High Performances Concrete containing metakaolin

Cited by 174 publications

References 22 publications

Capillary Transport of Water in Cracked and Non-cracked UHPFRC Specimens

Capillary Transport of Water in Cracked and Non-cracked UHPFRC Specimens

Use of metakaolin as supplementary cementitious material in concrete, with focus on durability properties

Research of the Parameters of Cut For the Machining of the New Concretes

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