B. Qu, A. Fernández Jiménez, A. Palomo, A. Martin, J. Pastor
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引用次数: 8
Abstract
The high-temperature mechanical behaviour of a pre-industrial hybrid alkaline cement (HYC) was studied. The HYC in question contained 30 % Portland clinker and 70 % of a blend of slag, fly ash and a solid activator (mix of alkaline salts with a predominance of Na 2 SO 4 ). The material was tested during exposure to high temperatures to establish its compressive and bending strength and elastic modulus, as well as fracture toughness, analysed using an innovative methodology to notch the hydrated cement paste specimens. Post-thermal treatment tests were also run to assess residual mechanical strength after 2 h of exposure to temperatures ranging from 400 °C to 1000 °C. TG/DTA, MIP and SEM were deployed to ascertain heat-induced physical-chemical changes in the structure. The higher mechanical strength during and after treatment exhibited by the hardened hybrid alkaline cement than the CEM I 42.5R ordinary portland cement (OPC) paste used as a reference was associated with the lower water and portlandite content found in HYC. Pseudo-plastic behaviour was observed at high temperatures in the loaded HYC in the tests conducted during exposure.
研究了工业化前混合碱性水泥(HYC)的高温力学行为。所讨论的HYC含有30%的波特兰熟料和70%的矿渣、粉煤灰和固体活化剂的混合物(碱性盐的混合物,主要是Na2SO4)。在暴露于高温的过程中对该材料进行了测试,以确定其压缩和弯曲强度、弹性模量以及断裂韧性,并使用创新的方法对水合水泥浆试样进行了分析。还进行了热处理后试验,以评估暴露在400°C至1000°C温度下2小时后的残余机械强度。采用TG/DTA、MIP和SEM来确定热引起的结构的物理化学变化。硬化混合碱性水泥在处理期间和处理后表现出比用作参考的CEM I 42.5R普通硅酸盐水泥(OPC)浆体更高的机械强度,这与HYC中发现的较低的水和硅酸盐含量有关。在暴露期间进行的测试中,在高温下在负载的HYC中观察到伪塑性行为。
期刊介绍:
Materiales de Construcción is a quarterly, scientific Journal published in English, intended for researchers, plant technicians and other professionals engaged in the area of Construction, Materials Science and Technology. Scientific articles focus mainly on:
- Physics and chemistry of the formation of cement and other binders.
- Cement and concrete. Components (aggregate, admixtures, additions and similar). Behaviour and properties.
- Durability and corrosion of other construction materials.
- Restoration and conservation of the materials in heritage monuments.
- Weathering and the deterioration of construction materials.
- Use of industrial waste and by-products in construction.
- Manufacture and properties of other construction materials, such as: gypsum/plaster, lime%2