Evaluation of residual mechanical properties of steel fiber-reinforced reactive powder concrete after exposure to high temperature using nondestructive testing

机译：使用非破坏性测试在高温暴露于高温后钢纤维增强活性粉混凝土的残留力学性能评价

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Reactive powder concrete (RPC) is classified as ultra-high performance concrete, owing to its superior strength, excellent durability and high fracture energy. However, RPC may also be severely affected by devastating fire exposures. This paper presents the variations in residual mechanical properties of RPC after exposure to high temperature. The strength of RPC after cooling was also assessed by nondestructive tests (NDTs). The ultrasonic pulse velocity (UPV) method and resonance frequency (RF) method were used. The samples were subjected to the target temperature of 120°C, 300°C, 500°C, 700°C and 900°C. The heating was continued for further 3 hours so that steady state condition was achieved. The available equations have been used for determination of dynamic elastic modulus of RPC using UPV and RF measurements. The residual mechanical properties, RF and UPV were plotted as a function of temperature. The result shows that the residual strength increases from room temperature to 300°C. However, above 300°C, it's decreasing gradually. Various comparisons have been made between residual mechanical strength versus UPV and RF measurements. Relationships have been proposed among residual mechanical properties versus NDTs values. These relationships can be employed for post-fire strength assessment of RPC structures.

机译：反应性粉末混凝土（RPC）被归类为超高性能混凝土，由于其优越的强度，优异的耐用性和高裂缝能量。然而，RPC也可能严重影响毁灭性的火灾曝光。本文介绍了暴露于高温后RPC的残留力学性能的变化。冷却后RPC的强度也被非破坏性测试（NDTS）评估。使用超声波脉冲速度（UPV）方法和谐振频率（RF）方法。对样品进行120℃，300℃，500℃，700℃和900℃的目标温度。继续加热3小时，以实现稳态条件。可用的方程已经用于使用UPV和RF测量测定RPC的动态弹性模量。将残留的机械性能，RF和UPV绘制为温度的函数。结果表明，残余强度从室温增加到300℃。然而，超过300°C，它逐渐减小。已经在剩余机械强度与UPV和RF测量之间进行了各种比较。已经在残余机械性能与NDTS值之间提出了关系。这些关系可用于RPC结构的火灾后强度评估。

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《Conference on Performance-based Fire and Fire Protection Engineering》|2018年|629 p.|共9页
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Xiaomeng Hou; Muhammad Abid; Wenzhong Zheng;
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中图分类防火（耐火）结构;
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Reactive powder concrete; high temperature; residual mechanical properties; ultrasonic pulse velocity; resonance frequency;

机译：反应粉混凝土;高温;剩余机械性能;超声波脉冲速度;共振频率;

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1. Mechanical Properties of Hybrid Steel–Glass Fiber-Reinforced Reactive Powder Concrete After Exposure to Elevated Temperatures [J] . Syed Safdar Raza, Liaqat Ali Qureshi, Babar Ali, Arabian Journal for Science and Engineering . 2020,第5期

机译：钢-玻璃纤维混合活性粉末混凝土在高温下的力学性能
2. Compressive stress-strain relationship of steel fiber-reinforced reactive powder concrete after exposure to elevated temperatures [J] . Wenzhong Zheng, Haiyan Li, Ying Wang Construction and Building Materials . 2012,第期

机译：钢纤维增强活性粉末混凝土暴露于高温后的压缩应力-应变关系
3. Tensile Properties of Hybrid Fiber-Reinforced Reactive Powder Concrete After Exposure to Elevated Temperatures [J] . Haiyan Li, Gang Liu International Journal of Concrete Structures and Materials . 2016,第1期

机译：高温后混合纤维增强活性粉末混凝土的拉伸性能
4. Evaluation of residual mechanical properties of steel fiber-reinforced reactive powder concrete after exposure to high temperature using nondestructive testing [C] . Xiaomeng Hou, Muhammad Abid, Wenzhong Zheng Conference on Performance-based Fire and Fire Protection Engineering . 2018

机译：使用非破坏性测试在高温暴露于高温后钢纤维增强活性粉混凝土的残留力学性能评价
5. A practical engineering model to predict the tensile strength of steel fiber-reinforced concrete from the mechanical properties of its constituent materials. [D] . Mousa, Belal Rashied. 1994

机译：一种实用的工程模型，可根据其组成材料的机械性能预测钢纤维增强混凝土的抗拉强度。
6. Mechanical Testing of Composite Steel and Reactive Powder Concrete Structural Element [O] . Jan Bujnak, Peter Michalek, Frantisek Bahleda, 2020

机译：复合钢和反应粉混凝土结构元件的机械测试
7. Mechanical properties of various concrete after high temperature exposure Mechanical property of various types of concrete after high temperature exposure is investigated. Considering compressive strength requirement for a vertical element in high rise building, concrete specimens with various design strengths of 35, 80, 100, and 150 MPa were tested. Particularly, the influence of incorporated steel fiber on fire resistance is of interest in this study. Experimental results show that the fire resistance depends on the design strength and steel fiber content. Normal strength concrete (NSC) of a design strength of 35 MPa or high performance concrete (HPC) of 80-100 MPa does not spall when exposed to 100-400 °C of temperature. However, an explosive spalling occurs at 300 °C when the HPCs contain 1 vol. of steel fiber. Ultra-high performance concrete (UHPC) of a design strength of 150 MPa and 1.5 vol. of steel fiber also shows dramatic spalling at 300 °C. The experimental results found in this study can contribute to a better understanding of the behaviors of HPC and UHPC under fire and the role of steel fiber on the fire resistance. [O] . 2017

机译：研究了高温暴露后各种混凝土高温曝光机械性能各种混凝土的机械性能。考虑到高层建筑中垂直元件的抗压强度要求，测试了35,80,100和150MPa各种设计强度的混凝土试样。特别是，在这项研究中，掺入钢纤维对耐火性的影响。实验结果表明，耐火性取决于设计强度和钢纤维含量。在暴露于100-400°C的温度时，80-100MPa的设计强度为35MPa或高性能混凝土（HPC）的正常强度混凝土（NSC）不会击落。然而，当HPC含有1体积的钢纤维的百分比时，爆炸性剥落发生在300℃。超高性能混凝土（UHPC）的设计强度为150 MPa和1.5 Vol。钢纤维的百分比也显示出300℃的剧烈剥落。本研究中发现的实验结果可以有助于更好地了解在火灾中的HPC和UHPC的行为以及钢纤维对耐火性的作用。

Evaluation of residual mechanical properties of steel fiber-reinforced reactive powder concrete after exposure to high temperature using nondestructive testing

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