Kinetische betrachtungen über den thermischen abbau zementgebundener betone und dessen mechanische auswirkungen

Schneider, Ute; Weiβ, R.

doi:10.1016/0008-8846(77)90087-4

Cited by 12 publications

(3 citation statements)

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“…Relative compressive strength values decreased at 150 °C in every case compared to the relative values of the initial 20 °C, then at 300 °C the values increased over the initial ones and as a result of further temperature increases, compressive strength values were observed to decrease again (Fig. 4), the same tendencies was observed by other researchers [6,8,25].…”

Section: Changes the Compressive Strength In Function Of The Temperaturesupporting

confidence: 85%

“…Between 450 °C and 550 °C the decomposition of non-carbonated portlandite takes place (Ca(OH) 2 → CaO + H 2 O↑). This process leads to an endothermic (heat absorbing) peak and further mass loss at the same time [8]. In ordinary concrete, the crystal transformation of quartz from α to β causes an endothermic peak of small intensity at 573 °C.…”

Section: Introductionmentioning

confidence: 99%

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The Influence of Concrete Strength on the Effect of Synthetic Fibres on Fire Resistance

Lublóy

2017

Period. Polytech. Civil Eng.

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Numerous studies have verified that increased concrete strength reduces its resistance to fire, leads to a higher degree of strength reduction and higher chances of spalling of concrete surfaces.The risks of spalling of concrete surfaces can be reduced by adding synthetic polypropylene fibres. Numerous experiments have shown that the risk of spalling of the concrete surface is significantly lower when using short, small diameter fibres of polypropylene synthetic, because the pore structure created by the burning of fibres reduces the risk of cracking.However, the question arises whether other types of fibres of greater diameter and length are still able to prevent spalling of concrete surfaces without drastically reducing the strength and if so, in what range of concrete strength it is true.The experiments are aimed to determine the effects of micro and macro synthetic fibres on the post-fire residual compressive strength, flexural strength and porosity of concrete.Nine kinds of mixture were prepared and tested. Three of them are without fibers (reference concretes) with diverse strength, three with synthetic micro-fibres with diverse strength and three with synthetic macro-fibres of diverse strength. The experiment was conducted with three concretes with different strength. Each type had a reference concrete without fibre reinforcement, one with micro- and one with macro-fibres.

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Section: Changes the Compressive Strength In Function Of The Temperaturesupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

The Influence of Concrete Strength on the Effect of Synthetic Fibres on Fire Resistance

Lublóy

2017

Period. Polytech. Civil Eng.

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“…After that, when the temperature ranges between 450 °C and 550 °C, there is decomposition of not carbonated portlandite (Ca (OH) 2 → CaO + H 2 O↑). This process leads to an endothermic peak and consequently to further loss of mass [ 24 ]. In fact, dehydration of portlandite causes the most significant loss of strength in concrete [ 25 ].…”

Section: Response Of Different Concrete Types Exposed To Elevated Tem...mentioning

confidence: 99%

Performance of Different Concrete Types Exposed to Elevated Temperatures: A Review

et al. 2022

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Concrete is a heterogeneous material that consists of cement, aggregates, and water as basic constituents. Several cementitious materials and additives are added with different volumetric ratios to improve the strength and durability requirements of concrete. Consequently, performance of concrete when exposed to elevated temperature is greatly affected by the concrete type. Moreover, post-fire properties of concrete are influenced by the constituents of each concrete type. Heating rate, days of curing, type of curing, cooling method, and constituents of the mix are some of the factors that impact the post-fire behavior of concrete structures. In this paper, an extensive review was conducted and focused on the effect of concrete constituents on the overall behavior of concrete when exposed to elevated temperature. It was evident that utilizing fibers can improve the tensile capacity of concrete after exposure to higher temperatures. However, there is an increased risk of spalling due to the induced internal stresses. In addition, supplementary cementitious materials such as metakaolin and silica fume enhanced concrete strength, the latter proving to be the most effective. In terms of the heating process, it was clear that several constituents, such as silica fume or fly ash, that decrease absorption affect overall workability, increase the compressive strength of concrete, and can yield an increase in the strength of concrete at 200 °C. Most of the concrete types show a moderate and steady decrease in the strength up until 400 °C. However, the decrease is more rapid until the concrete reaches 800 °C or 1000 °C at which it spalls or cannot take any applied load. This review highlighted the need for more research and codes’ provisions to account for different types of concrete constituents and advanced construction materials technology.

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Heat deformations of cement paste phases and the microstructure of cement paste

Piasta

1984

Mat. Constr.

102

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Kinetische betrachtungen über den thermischen abbau zementgebundener betone und dessen mechanische auswirkungen

Cited by 12 publications

References 1 publication

The Influence of Concrete Strength on the Effect of Synthetic Fibres on Fire Resistance

The Influence of Concrete Strength on the Effect of Synthetic Fibres on Fire Resistance

Performance of Different Concrete Types Exposed to Elevated Temperatures: A Review

Heat deformations of cement paste phases and the microstructure of cement paste

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