Tiwary Aditya Kumar, Singh Sandeep, Kumar Raman, Chohan Jasgurpreet Singh, Sharma Shubham, Singh Jujhar, Li Changhe, Ilyas R A, Asyraf M R M, Malik Mohammad Abdul
Department of Civil Engineering, Chandigarh University, Mohali 140413, India.
University Centre of Research and Development, Mechanical Engineering Department, Chandigarh University, Mohali 140413, India.
Materials (Basel). 2022 May 19;15(10):3632. doi: 10.3390/ma15103632.
Concrete is a composite material that is commonly used in the construction industry. It will certainly be exposed to fires of varying intensities when used in buildings and industries. The major goal of this article was to look into the influence of mineral additions such as foundry sand and marble dust on the residual characteristics of concrete. To examine the behavior of residual characteristics of concrete after fire exposure, marble dust was substituted for cement and fine sand was substituted for foundry sand in varying amounts ranging from 0% to 20%. It aided in the better disposal of waste material so that it might be used as an addition. The purpose of the experiment was to see how increased temperatures affected residual properties of concrete, including flexural strength, compressive strength, tensile strength, static as well as dynamic elastic modulus, water absorption, mass loss, and ultrasonic pulse velocity. At temperatures of 200 °C, 400 °C, 600 °C, 800 °C, and 1000 °C, the typical fire exposure behavior of concrete was investigated. The effects of two cooling techniques, annealing and quenching, on the residual properties of concrete after exposure to high temperatures were investigated in this study. Replacement of up to 10% of the cement with marble dust and fine sand with foundry sand when concrete is exposed to temperatures up to 400 °C does not influence the behavior of concrete. At temperatures above 400 °C, however, the breakdown of concrete, which includes marble dust and foundry sand, causes a rapid deterioration in the residual properties of concrete, primarily for replacement of more than 10%.
混凝土是一种在建筑行业中常用的复合材料。当它用于建筑物和工业时，肯定会面临不同强度的火灾。本文的主要目的是研究诸如铸造砂和大理石粉等矿物掺合料对混凝土残余特性的影响。为了研究火灾暴露后混凝土残余特性的表现，用大理石粉替代水泥，并用不同比例（从0%到20%）的细砂替代铸造砂。这有助于更好地处理废料，使其可作为一种掺合料使用。该实验的目的是观察温度升高如何影响混凝土的残余性能，包括抗弯强度、抗压强度、抗拉强度、静态和动态弹性模量、吸水率、质量损失以及超声波脉冲速度。在200℃、400℃、600℃、800℃和1000℃的温度下，研究了混凝土典型的火灾暴露行为。本研究还考察了两种冷却技术，即退火和淬火，对高温暴露后混凝土残余性能的影响。当混凝土暴露在高达400℃的温度下时，用大理石粉替代高达10%的水泥以及用铸造砂替代细砂不会影响混凝土的性能。然而，在温度高于400℃时，含有大理石粉和铸造砂的混凝土的分解会导致混凝土残余性能迅速恶化，主要是当替代比例超过10%时。
