用于预制舱的玻璃纤维混凝土弹性模量与本构关系研究
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摘要
为满足标准配送式变电站对二次设备预制舱原材料的性能要求,对硅酸盐水泥基玻璃纤维混凝土和硫铝酸盐基玻璃纤维混凝土的弹性模量和本构关系进行了研究。实验采取两种不同基材GRC材料的9种配合比,考虑水灰比、胶砂比、玻璃纤维掺量等三种对GRC材料性能影响明显的参数,对比了不同配合比下GRC材料的性能表现。实验结果显示,对于硅酸盐水泥GRC材料,提高水灰比会导致其抗压强度降低;而对于硫铝酸盐GRC材料,适当提高水灰比会减少纤维引入的缺陷,一定程度上提高抗压强度。GRC材料弹性模量主要受水灰比的影响,与之呈负相关; GRC材料受弯时,基体强度较高的GRC材料整体强度更高,但破坏速度更快;基体强度较低时整体强度也略有下降,但破坏速度更平缓;硫铝酸盐水泥GRC材料的破坏速度均小于硅酸盐水泥GRC材料。
In order to meet the performance requirements of the materials used by standard distributional substations' secondary equipment prefabricated cabin,the elasticity modulus and constitutive relation of Portland cement based glass fiber reinforced concrete and sulphoaluminate based glass fiber reinforced concrete were studied. In this experiment,nine kinds of mixing ratios of GRC materials with different substrates were designed. Considering the water-cement ratio,the cement-sand ratio and the amount of glass fiber,these three parameters which have obvious influence on the performance of GRC materials were compared. The experimental results show that for Portland cement GRC materials,increasing the water-cement ratio will result in a decrease in compressive strength. For sulphoaluminate GRC materials,appropriately increasing the water-cement ratio will reduce the defects introduced by the fiber and improve the strength to some extent. The elastic modulus of the GRC material is mainly affected by the watercement ratio and is negatively correlated. When the GRC material is bent,the GRC material with higher matrix strength has higher peak stress,but the destruction speed is faster. When the strength of the matrix is low,the peak stress also decreases slightly,but the destruction speed is more gradual. The sulphoaluminate cement GRC material has a lower failure rate than the Portland cement GRC material.
In order to meet the performance requirements of the materials used by standard distributional substations' secondary equipment prefabricated cabin,the elasticity modulus and constitutive relation of Portland cement based glass fiber reinforced concrete and sulphoaluminate based glass fiber reinforced concrete were studied. In this experiment,nine kinds of mixing ratios of GRC materials with different substrates were designed. Considering the water-cement ratio,the cement-sand ratio and the amount of glass fiber,these three parameters which have obvious influence on the performance of GRC materials were compared. The experimental results show that for Portland cement GRC materials,increasing the water-cement ratio will result in a decrease in compressive strength. For sulphoaluminate GRC materials,appropriately increasing the water-cement ratio will reduce the defects introduced by the fiber and improve the strength to some extent. The elastic modulus of the GRC material is mainly affected by the watercement ratio and is negatively correlated. When the GRC material is bent,the GRC material with higher matrix strength has higher peak stress,but the destruction speed is faster. When the strength of the matrix is low,the peak stress also decreases slightly,but the destruction speed is more gradual. The sulphoaluminate cement GRC material has a lower failure rate than the Portland cement GRC material.
引文
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[2]周文,李杰.配送式预制舱智能变电站技术[J].电气技术,2014(4):88-91.
[3]刘志成,崔琪,李清海.玻璃纤维增强水泥(GRC)研究与发展综述[J].中国建材科技,2015,24(3):41-44.
[4]Lober P,Holschemacher K.Structural glass fiber reinforced concrete for slabs on ground[J].World Journal of Engineering and Technology,2014,2:48-54.
[5]王艳琼.玻璃纤维混凝土耐久性及耐高温试验研究[D].银川:宁夏大学,2016.
[6]郑红勇.玻璃纤维混凝土性能分析及其在工程中的应用[J].工程建设与设计,2015(5):137-139.
[7]宋小软,代巍,徐子亮,等.GRC模板的抗碱性能及耐久性能试验研究[J].北京工业大学学报,2011,37(2):206-210.
[8]孔迎春.耐碱玻璃纤维混凝土性能试验及其在隧道工程中隔墙的应用研究[D].青岛:山东科技大学,2017.
[9]王晖.耐碱玻璃纤维混凝土力学性能试验研究[D].西安:西安建筑科技大学,2016.
[10]Mehran K,Majid A.Use of glass and nylon fibers in concrete for controlling early age micro cracking in bridge decks[J].Construction and Building Materials,2016(125):800-808.
[11]Hanuma K,Rao C B K.Effect of graded fibers on stress strain behaviour of glass fiber reinforced concrete in tension[J].Construction and Building Materials,2018(183):592-604.
[12]Ars Ian M.Effects of basalt and glass chopped fibers addition on fracture energy and mechanical properties of ordinary concrete:CMODmeasurement[J].Construction and Building Materials,2016(114):383-391.
[13]建筑材料科学研究院水泥研究所.硫铝酸盐水泥水化、硬化及其特性[J].硅酸盐学报,1978(3):123-140+225.
[14]韩建国,阎培渝.锂化合物对硫铝酸盐水泥水化历程的影响[J].硅酸盐学报,2010,38(4):608-614.