Hygrothermal properties of glass fiber reinforced cements subjected to elevated temperature

Thermal Expansion of Aluminate Cement-Based Composite Containing Basalt Fibres with Different Length

“…They studied residual compressive strength and flexural strength of PP fibre reinforced Portland cement paste up to 700 °C. Černý et al [2] analysed the effect of elevated temperatures up to 800 °C on hygric and thermal properties of three types of glass fibre reinforced cement composites. Li et al [3] focused their research on mechanical properties of composites with perlite aggregates reinforced by steel and PVA fibres after heating up to 600 °C.…”

Cement Composites for High Temperature Applications

“…It may seem surprising that very little attention was paid to the fiber-reinforced cement composites subjected to high temperatures in general; only few papers dealing with this topic were found in common sources during the last years. Komonen and Penttala [1] studied the effect of high temperatures up to 700°C on the residual compressive and flexural strength of PP fiber reinforced Portland cement paste, Černý et al [2] analyzed the effect of elevated temperatures up to 800°C on hygric and thermal properties of three types of glass fiber reinforced cement composites, Li et al [3] measured residual compressive strength, flexural strength and modulus of elasticity of cement composites with perlite aggregates reinforced by steel and PVA fibers after heating up to 600°C, Peng et al [4] analyzed the relationship between explosive spalling and residual mechanical properties of steel-fiber, PP-fiber and hybrid steel-PP fiber reinforced HPC after exposure to high temperatures in the range of 200-800°C, Černý et al [5] measured thermal conductivity, specific beat capacity, thermal diffusivity and linear thermal expansion coefficient of two types of basalt fiber reinforced cement composites in the temperature range up to 800°C. In other research [6] the influence of fine ceramic powder in composite mixtures was studied.…”

Self-Compacted Concrete with Self-Protection and Self-Sensing Functionality for Energy Infrastructures

“…While the performance of concrete at high temperatures, such as fire events, is well known and established in standards, there is a lack of knowledge on the response of concreteto long term cyclic thermal fatigue, andonly a few papers have been published [3][4][5][6].The risk of explosions during operation cannot be ignored [7].Concrete exposed to high temperatures follows a series of physico-chemical changes [8], such as the dehydration of cement paste that results in mechanical losses and the generation of cracks. The selection of adequate concrete components, the cement type (such as Portland cement with the addition of supplementary minerals), and aggregate type (the size distribution and the chemical composition) are fundamental in the design of a concrete that can resist high temperatures [8][9][10].The major concerns in relation to the use of concrete for heat storage in aCSP is failure due to the risk of explosion, and its stability during the repetitive heatcharge and discharge cycles.The type of binder and aggregate chosen have been shown to affect the cycling thermal resistance of concrete [5,6] but cracking control and mechanical integrity needs more improvement.Regarding the design of thermal concrete for STE use, several alternatives have been suggested to improve the resistance of concrete to thermal fatigue: The use of suitable components [4,6], such as cement and aggregates with low expansion and appropriate size distribution and the incorporation of fibers [8,[11][12][13][14].Fiber reinforced concretes (FRC) are increasingly used. The incorporation of fibers to reinforce the concrete matrix is also beneficial for concrete exposed to high temperatures [11].…”

“…Polypropylene fibers (PPF) are used to minimize the risk of concrete spalling [12], as theymelt at relatively low temperatures (160ºC), and create new paths for vapor to find a way out, thus relaxing the internal thermal stresses in concrete at high temperatures. In addition to this, the stronger thermal resistance fibers, suchas steel or glass fibers, seem to contribute to keeping the dehydrated cement paste and fiberbound together [8,12,13]. Other typesof fibers which have been used more recently, to reinforce the concrete matrix are carbon fibers (CF) andcarbon nanotubes (CNT) and Carnon nanofibers (CNF), but there is less evidence on their performance at high temperatures [14].…”

“…Regarding the design of thermal concrete for STE use, several alternatives have been suggested to improve the resistance of concrete to thermal fatigue: The use of suitable components [4,6], such as cement and aggregates with low expansion and appropriate size distribution and the incorporation of fibers [8,[11][12][13][14].…”