复掺纤维活性粉末混凝土高温力学性能研究
|
摘要
通过复掺纤维的活性粉末混凝土(RPC)高温试验,研究了复掺纤维的活性粉末混凝土高温物理变化及力学性能变化规律。试验结果表明,随着温度增加,RPC表观颜色经历青灰色→微褐色→棕褐色→深褐色→灰褐色→灰白色的变化,表观裂缝数量由少量→较多→大量,此物理变化可为RPC结构火灾现场过火温度判断提供参考。随着温度的升高,复掺纤维的RPC抗压强度、抗拉强度、抗折强度均先增大后降低,其中,抗压强度、抗拉强度、抗折强度的临界温度分别为300℃、100℃、100℃。钢纤维、聚丙烯纤维的复合掺入有效提高了RPC高温后相对抗压强度、相对抗拉强度、相对抗折强度,钢纤维掺量为2%、聚丙烯纤维掺量为0.1%时,RPC有着较好的抗压、抗拉、抗折强度,同时RPC高温力学性能得到增强。
Through high temperature test of fiber reinforced reactive powder concrete, the physical and mechanical properties of reactive powder concrete(RPC) mixed with fiber were studied. The experimental results show that, with the increase of temperature, the apparent colors of RPC undergo a change of green, brown, dark brown, gray brown and gray white. The apparent crack number is from a small amount to a large number. The above physical changes can provide a reference for the fire temperature of the RPC structure. With the increase of temperature, the compressive strength, tensile strength and flexural strength increased at first and then decreased, and the critical temperatures of the compressive strength, tensile strength and flexural strength were 300 ℃, 100 ℃ and 100 ℃, respectively. The composite addition of steel fiber and polypropylene fiber can effectively improve the relative compressive strength, relative tensile strength and relative flexural strength of RPC at high temperature. When the content of steel fiber is 2% and the content of polypropylene fiber is 0.1%, the compressive, tensile and flexural strength of RPC are better, and the mechanical properties of RPC are enhanced at the same time.
Through high temperature test of fiber reinforced reactive powder concrete, the physical and mechanical properties of reactive powder concrete(RPC) mixed with fiber were studied. The experimental results show that, with the increase of temperature, the apparent colors of RPC undergo a change of green, brown, dark brown, gray brown and gray white. The apparent crack number is from a small amount to a large number. The above physical changes can provide a reference for the fire temperature of the RPC structure. With the increase of temperature, the compressive strength, tensile strength and flexural strength increased at first and then decreased, and the critical temperatures of the compressive strength, tensile strength and flexural strength were 300 ℃, 100 ℃ and 100 ℃, respectively. The composite addition of steel fiber and polypropylene fiber can effectively improve the relative compressive strength, relative tensile strength and relative flexural strength of RPC at high temperature. When the content of steel fiber is 2% and the content of polypropylene fiber is 0.1%, the compressive, tensile and flexural strength of RPC are better, and the mechanical properties of RPC are enhanced at the same time.
引文
[1]Richard P,Cheyrezy M.Composition of reactive powder concretes[J].Cement&Concretce Research,1995(7):1501-1511.
[2]张荣华,徐迅,刘应虎,等.基于力学性能的活性粉末混凝土配合比设计[J].混凝土与水泥制品,2017(8):15-19.
[3]贾方方,王万金,贺奎,等.不同纤维活性粉末混凝土基本性能研究[J].混凝土与水泥制品,2016(9):53-56.
[4]牛志强,郭阳.蒸养参数对活性粉末混凝土抗氯离子渗透性的影响[J].新型建筑材料,2017(8):127-130.
[5]Tai Y S,Pan H H,Kung Y N.Mechanical properties of steel fiber reinforced reactive powder concrete following exposure to high temperature reaching 800°C[J].Nuclear Engineering&Design,2011,241(7):2416-2424.
[6]时术兆,齐砚勇,严云,等.纤维增强活性粉末混凝土高温力学性能的实验研究[J].材料导报,2009,23(10):65-68.
[7]刘红彬,李康乐,鞠杨,等.钢纤维活性粉末混凝土的高温爆裂试验研究[J].混凝土,2010(8):6-8.
[8]陈强.高温对活性粉末混凝土高温爆裂行为和力学性能的影响[D].北京:北京交通大学,2010.
[9]罗百福,郑文忠,李海艳.高温下掺PPF的RPC立方体抗压性能[J].哈尔滨工业大学学报,2012,44(12):1-7.
[2]张荣华,徐迅,刘应虎,等.基于力学性能的活性粉末混凝土配合比设计[J].混凝土与水泥制品,2017(8):15-19.
[3]贾方方,王万金,贺奎,等.不同纤维活性粉末混凝土基本性能研究[J].混凝土与水泥制品,2016(9):53-56.
[4]牛志强,郭阳.蒸养参数对活性粉末混凝土抗氯离子渗透性的影响[J].新型建筑材料,2017(8):127-130.
[5]Tai Y S,Pan H H,Kung Y N.Mechanical properties of steel fiber reinforced reactive powder concrete following exposure to high temperature reaching 800°C[J].Nuclear Engineering&Design,2011,241(7):2416-2424.
[6]时术兆,齐砚勇,严云,等.纤维增强活性粉末混凝土高温力学性能的实验研究[J].材料导报,2009,23(10):65-68.
[7]刘红彬,李康乐,鞠杨,等.钢纤维活性粉末混凝土的高温爆裂试验研究[J].混凝土,2010(8):6-8.
[8]陈强.高温对活性粉末混凝土高温爆裂行为和力学性能的影响[D].北京:北京交通大学,2010.
[9]罗百福,郑文忠,李海艳.高温下掺PPF的RPC立方体抗压性能[J].哈尔滨工业大学学报,2012,44(12):1-7.