Durability of Steam Cured Pozzolanic Mortars at Atmospheric Pressure

Barış, Kübra Ekiz; Tanaçan, Leyla

doi:10.1007/978-94-024-1207-9_8

Cited by 3 publications

(5 citation statements)

References 9 publications

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“…After the hydration of OPC, a primary by-product, calcium hydroxide (CH), is produced, which is the main target of corrosive media to deteriorate the concrete [19,20]. Supplementary pozzolanic material consumes the CH during the pozzolanic reaction and forms additional calcium silicate hydrate (C-S-H) gel, leading to a durable concrete [21][22][23][24][25]. Pozzolanic cement blends show resistance to thermal cracking due to its low heats of hydration.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Thermo-Mechanical Activation of Bentonite on the Mechanical and Durability Performance of Concrete

et al. 2019

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Despite presenting a very high global warming toll, Portland cement concrete is the most widely used construction material in the world. The eco-efficiency, economy, and the overall mechanical and durability performances of concrete can be improved by incorporating supplementary cementitious materials (SCMs) as partial substitutions to ordinary Portland cement (OPC). Naturally found bentonite possesses pozzolanic properties and has very low carbon footprint compared to OPC. By applying activation techniques, the reactivity of bentonite can be improved, and its incorporation levels can be maximized. In this study, the influence of mechanical and thermo-mechanical activation of bentonite is investigated on properties of concrete. Bentonite was used for 0%, 10%, 15%, 20%, 25%, 30%, and 35% mass replacements of OPC. Mechanical (compressive strength and split tensile strength) and durability (water absorption, sorptivity coefficient, and acid attack resistance) properties were studied. Results of experimental testing revealed that, concrete containing bentonite showed good mechanical performance, while durability was significantly improved relative to control mix. Application of thermo-mechanical activation can enhance the incorporation levels of bentonite in concrete. At 15% and 25%, bentonite produced optimum results for mechanical and thermo-mechanical activation, respectively. Bentonite inclusion is more beneficial to the durability than the mechanical strength of concrete.

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Section: Introductionmentioning

confidence: 99%

The Influence of Thermo-Mechanical Activation of Bentonite on the Mechanical and Durability Performance of Concrete

et al. 2019

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“…This is in line with the findings of other studies [32,36], that CH is the most allergic component for the corrosive media. CH is consumed during pozzolanic reaction, thus reducing CH content durability of hydrated cement is improved [32][33][34][35][36]. It was also found that the "Calcined" clay modified samples showed more resistance to sulfate attack than that of "As is" clay modified samples as shown.…”

Section: "800°c Calcined" Mmt Modified Mortarsmentioning

confidence: 77%

“…This is due to the fact that use of pozzolona clay in mortars led to the production of additional calcium silicate hydrate (CSH) by consuming the hydrated product calcium hydroxide (CH) in the presence of moisture. CH is the main target for corrosive ions, thus reducing CH amount causes a reduction in expansive ettringite and gypsum, ultimately minimize the sulfate attack and chloride attack [32][33][34][35][36].…”

Section: "800°c Calcined" Mmt Modified Mortarsmentioning

confidence: 99%

“…This means that 25% replacement level is the optimum replacement level to produce a durable cement blend. As more CH is consumed during pozzolanic reaction of calcined clay to form additional CSH gel, thus reducing CH content durability of hydrated cement is improved [32][33][34][35][36].…”

Section: Comparison Of Compressive Strength Reduction In Various Envimentioning

confidence: 99%

“…CH is the most allergic component for the corrosive media. CH is consumed during pozzolanic reaction, thus reducing CH content durability of hydrated cement is improved [32][33][34][35][36]. Due to low heat of hydration pozzolanic incorporated blended cement shows high resistance to thermal cracking.…”

Section: Introductionmentioning

confidence: 99%

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Durability of Mortars Modified with Calcined Montmorillonite Clay

et al. 2019

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This study aims to evaluate the performance of mortars containing locally available Pakistani montmorillonite (Mmt) clay mineral as partial replacement of cement in various curing environments. The local montmorillonite clay in “As is” (20°C) and “heated” (100°C, 200°C, 300°C, 400°C, 500°C, 600°C, 700°C, 800°C, 900°C & 1000°C) conditions was incorporated in mortar cubes as partial replacement of cement. Montmorillonite clay of all the temperatures was replaced by 15%, 20%, 25%, 30% and 35% of cement mass in mortar cubes. The Strength Activity Index (SAI) was calculated to determine the optimum activation temperature for the clay. Compressive strengths of the controlled mix and montmorillonite modified mortars were evaluated under the Sodium Sulfate (SS) (5% solution) and mixed (Sodium Sulfate + Sodium Chloride (SCS)) (5% +3.5% solution) curing environments to study its durability performance. Upon thermal treatment montmorillonite clay showed maximum activation at 800°C temperature. Mortar containing (800°C) calcined montmorillonite clay with 25% cement replacement exhibit competent compression results. Moreover, up on exposure to aggressive environments, montmorillonite clay mortars performed better than the control samples. The mortar cubes exposed to Sulfate environment (SS) were more damaged in compression than that exposed to mixed environment (SCS), for all replacement levels and time exposures.

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