Behaviour of cement composites with lightweight and heavyweight aggregates at high temperatures

Bodnárová, Lenka; Hroudová, Jitka; Brožovský, Jiří; Zach, Jiří; Válek, Jaroslav

doi:10.3311/ppci.9365

Cited by 4 publications

(4 citation statements)

References 22 publications

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“…Fire safety of structure is a crucial aspect due to numerous terrorist attacks, war operations, and natural disasters caused by industrial production and traffic accidents. Fire jeopardizes human health, wildlife, personal, public property, and environmental damage (Bodnarova et al, 2017). The cement composites are prone to high temperature either during fire or vicinity of furnace and reactors.…”

Section: Introductionmentioning

confidence: 99%

Impact of high temperature on mortar mixes containing additives

Devi

Saini²,

Aggarwal³

2021

JER is an international, peer-reviewed journal that publishes f

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The structures may be exposed to fire or high temperature conditionally or accidentally. Alteration in the behavior of concrete structure is prospective under the exposure of elevated temperature. There is an urge to find the materials which can resist the alteration in physiochemical and strength properties of cementitious materials under high temperature. In the present study, the effect of elevated temperature on cement mortar consisting of additives i.e. accelerating admixtures, and stone waste i.e. stone slurry powder, was investigated and compared with specimens at room temperature. The aim of study was to examine the practicability of these additives under exposure to high temperatures. The mortar specimens were exposed to various temperatures i.e. 1500C, 3000C, 4500C and 6000C for the duration of one hour and compared with unheated samples. The change in mass, strength and micro-structure of mortar specimens at elevated temperature was studied. The environmental assessment and performance evaluation of various mortar mixes were also evaluated. The mass of mortar specimens reduced as the exposure temperature of specimens was raised. The residual strength of mortar increased up to a certain temperature afterward, it decreased. Stone slurry powder and calcium nitrate can be used individually and in combination to resist thermal changes.

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Section: Introductionmentioning

confidence: 99%

Impact of high temperature on mortar mixes containing additives

Devi

Saini²,

Aggarwal³

2021

JER is an international, peer-reviewed journal that publishes f

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“…It is important to selectively remove a layer of broken concrete and maintain healthy undamaged concrete [1]. A number of external influencesphysical (e. g. low and high temperature), chemical, and mechanical -affect the structure during use [2][3]. Concrete and concrete reinforcement is exposed to the effects of the external environment when used in construction.…”

Section: Introductionmentioning

confidence: 99%

Flow Erosion Resistance of Concrete - Interaction of High-Speed Water Jet and Concrete

Bodnárová

Hela

Sitek³

et al. 2019

SSP

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In the paper, the resistance of concrete to the erosive effect of water from a water jet was monitored. The tests were performed on concrete without the addition of fibres and on concrete with the addition of polypropylene fibres and steel fibres. The water flow hit the concrete surface at an angle of 90°. The water flow rate was 1.1 l/min and the water pressure was 80 MPa. After blasting the concrete with water jet, no cracks in the concrete were observed and the intended rugged surface relief was created. Steel fibres remained firmly anchored into the cement matrix.

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“…For a technical application to 700°C, the natural aggregate is suitable, but only from selected types of rock (basalt, andesite, and diabase) [13]. For example, silica aggregates are unacceptable, due to volume expansion (approximately 0.5%) at 573°C, when α-silica is change to β-silica [14].…”

Section: Basalt Aggregatementioning

confidence: 99%

“…Alternativelly could be used artificial aggregates for application up to 700°C (usually chamotte fireclay, bauxite, chromite, corundum, carborundum, slag, and electro-porcelain) [15]. The main filler of investigated cement composite was a combination of two fractions (0/4 mm and 2/5 mm) of natural crushed basalt aggregated, also used in [13]. High utility properties of natural basalt could be used for specific severe applications [16].…”

Section: Basalt Aggregatementioning

confidence: 99%