Behaviour of strain hardening geopolymer composites at elevated temperatures

Microstructural evolution and dynamic compressive properties of engineered cementitious composites at elevated temperatures

“…[19,56]. It is worth noting that approximately 75 wt% PVA fibres vaporised at 400 °C and the increased porosity within the concrete matrix led to a reduction in strength [21]. Compared to that at 20 °C, the compressive strength of ECC reduced by 34.3% at 600 °C and 70.6% at 800 °C, respectively.…”

“…The fracture energy and dissipated energy reached the maximum at 105 °C, which increased by 20.0−40.9% and 18.0−34.3%, relative to that of 20 °C, respectively. It can be explained by the improved bond between fibre and matrix at 105 °C [21,71]. At this time, the fibres at the crack were pulled out before reaching the peak stress.…”

“…The bonding of fibre and matrix is enhanced and the strain-hardening behaviour of PVA fibre reinforced ECC still maintains before 200 °C [10,19]. Around 250 °C, PVA fibres begin to melt but melted products are still remained, leading to the internal pore pressure developed due to the difficulty to deliver vapour [20][21][22]. Following this, the porosity of ECC at 400 °C increased due to the fibre disappearance and a relatively small amount of crack [23].…”

Orthogonal Experimental Study on the Factors Affecting the Mechanical Properties of Alkali-Activated Slag Materials

“…In many developing countries, the comprehensive utilization rate of blast furnace slag is still at a low level, which seriously restricts the sustainable development of local economy and society [2,3]. The slag-based geopolymer obtained by alkali activation has many advantages such as a high strength, a good corrosion resistance, low carbon and environmental protection [4][5][6]. It has good application prospects in the development trend of green cementitious materials in the future and has become the mainstream research direction of slag resource utilization [7][8][9].…”