纳米高性能混凝土断裂性能试验研究
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摘要
随着纳米材料研究的深入和纳米材料制造成本的降低,纳米高性能混凝土将是未来结构工程中应用潜力极大的一种新型高性能混凝土。目前,关于纳米高性能混凝土的研究已经越来越广泛,然而,关于纳米高性能混凝土弯曲韧性和断裂性能的研究较少,特别是关于钢纤维增强纳米高性能混凝土的研究更少。本文通过大量试验研究了纳米SiO2和钢纤维的掺量对纳米高性能混凝土基本力学性能、弯曲韧性和断裂性能的影响。主要研究内容包括：
(1)分析了纳米高性能混凝土的制备原理,并采用全计算法确定了高性能混凝土的基准配合比。通过坍落度和扩展度试验,得出了纳米SiO2和钢纤维对纳米高性能混凝土工作性能影响的规律。
(2)以混凝土试件3d、7d、28d、60d为龄期,通过立方体抗压强度试验,得出了纳米SiO2和钢纤维掺量对纳米高性能混凝土强度影响的规律。
(3)以混凝土试件28d为龄期,通过轴心抗压强度试验和抗压弹性模量试验,得出了纳米SiO2和钢纤维掺量对纳米高性能混凝土轴心抗压强度及弹性模量影响的规律。
(4)以混凝土试件28d为龄期,采用三分点加载试验方法,对纳米高性能混凝土抗弯拉强度及抗弯拉弹性模量进行了试验研究,得出了纳米SiO2和钢纤维掺量对纳米高性能混凝土抗弯拉强度及抗弯拉弹性模量影响的规律。
(5)以混凝土试件28d为龄期,通过尺寸为100mm×100mm×400mm试件的三分点加载弯曲韧性试验,并分别采用了ASTM-C1018韧度指数法和德国纤维混凝土标准DBV法对试验结果进行了分析,得出了钢纤维掺量对纳米高性能混凝土弯曲韧性影响的规律。
(6)以混凝土试件28d为龄期,通过尺寸为100mm×100mm×515mm试件的断裂性能试验,研究了纳米高性能混凝土的断裂性能,以有效裂缝长度、起裂断裂韧度、失稳断裂韧度、断裂能、临界裂缝张开位移和极限裂缝张开位移为评价指标,得出了纳米Si02和钢纤维掺量对纳米高性能混凝土断裂性能影响的规律,并对纳米高性能混凝土的缺口敏感性进行了研究。
As one kind of High Performance Concrete (HPC), with the advancement of research and the reduction of manufacturing cost of Nano materials, Nano High Performance Concrete (NHPC) has showed its wide application potential on structural engineering in future. However, the research on bend ductility and fracture performance of NHPC, especially of Steel Fiber Reinforced NHPC (SFRNHPC), is too few to demands of construction. This paper showed the effect of fundamental mechanical performance, bend ductility and fracture performance influenced by the mixing proportion of Nano SiO2and steel fiber based on large amount of tests. The main contents including in this paper are as following:
(1) The preparation theory of NHPC was analyzed, and the mix proportion of NHPC was determined applying the overall calculation method. The influencing rule of Nano SiO2and steel fiber on the performance of NHPC was obtained through the test of slump and slump spread.
(2) With3d,7d,28d,60d as the curing period, the rules of the effects of Nano SiO2and steel fiber on the strength of HPC is obtained through the test of cubic compression strength.
(3) With28d as the curing period of concrete specimens, the rules that Nano SiO2and steel fiber influencing on the axial compressive strength and elastic modulus of HPC were obtained through the axis compressive strength test and compressive elastic modulus test.
(4) With28d as the curing period of concrete specimens, the flexural strength and flexural modulus are studied, and the rules of effects of the Nano SiO2and steel fiber influencing on flexural strength and flexural modulus of NHRC were obtained by three-point loading experiment.
(5) Based on experiments of three-point bending beam test, with28d as the curing period of concrete specimens whose size are100mm×100mm×400mm, the rules of the bend ductility influenced by the dosage of steel fiber were analyzed applying the method of ASTM C1018Toughness Index and DBV which is Germany fiber reinforced concrete standard.
(6) Through the three-point bending beam test, with a set of specimens whose size are100mm×100mm×515mm aged28d, the bend ductility was studied in this paper. Taking the effective crack length, instability fracture toughness, the crack fracture toughness, fracture energy, critical crack opening displacement and limit fracture opening displacement as evaluation indices, the basic influence rules of Nano SiO2and steel fiber on the fracture property of NHPC were obtained, and the notch sensitivity of the fracture specimens of NHPC was also studied.
(1)分析了纳米高性能混凝土的制备原理,并采用全计算法确定了高性能混凝土的基准配合比。通过坍落度和扩展度试验,得出了纳米SiO2和钢纤维对纳米高性能混凝土工作性能影响的规律。
(2)以混凝土试件3d、7d、28d、60d为龄期,通过立方体抗压强度试验,得出了纳米SiO2和钢纤维掺量对纳米高性能混凝土强度影响的规律。
(3)以混凝土试件28d为龄期,通过轴心抗压强度试验和抗压弹性模量试验,得出了纳米SiO2和钢纤维掺量对纳米高性能混凝土轴心抗压强度及弹性模量影响的规律。
(4)以混凝土试件28d为龄期,采用三分点加载试验方法,对纳米高性能混凝土抗弯拉强度及抗弯拉弹性模量进行了试验研究,得出了纳米SiO2和钢纤维掺量对纳米高性能混凝土抗弯拉强度及抗弯拉弹性模量影响的规律。
(5)以混凝土试件28d为龄期,通过尺寸为100mm×100mm×400mm试件的三分点加载弯曲韧性试验,并分别采用了ASTM-C1018韧度指数法和德国纤维混凝土标准DBV法对试验结果进行了分析,得出了钢纤维掺量对纳米高性能混凝土弯曲韧性影响的规律。
(6)以混凝土试件28d为龄期,通过尺寸为100mm×100mm×515mm试件的断裂性能试验,研究了纳米高性能混凝土的断裂性能,以有效裂缝长度、起裂断裂韧度、失稳断裂韧度、断裂能、临界裂缝张开位移和极限裂缝张开位移为评价指标,得出了纳米Si02和钢纤维掺量对纳米高性能混凝土断裂性能影响的规律,并对纳米高性能混凝土的缺口敏感性进行了研究。
As one kind of High Performance Concrete (HPC), with the advancement of research and the reduction of manufacturing cost of Nano materials, Nano High Performance Concrete (NHPC) has showed its wide application potential on structural engineering in future. However, the research on bend ductility and fracture performance of NHPC, especially of Steel Fiber Reinforced NHPC (SFRNHPC), is too few to demands of construction. This paper showed the effect of fundamental mechanical performance, bend ductility and fracture performance influenced by the mixing proportion of Nano SiO2and steel fiber based on large amount of tests. The main contents including in this paper are as following:
(1) The preparation theory of NHPC was analyzed, and the mix proportion of NHPC was determined applying the overall calculation method. The influencing rule of Nano SiO2and steel fiber on the performance of NHPC was obtained through the test of slump and slump spread.
(2) With3d,7d,28d,60d as the curing period, the rules of the effects of Nano SiO2and steel fiber on the strength of HPC is obtained through the test of cubic compression strength.
(3) With28d as the curing period of concrete specimens, the rules that Nano SiO2and steel fiber influencing on the axial compressive strength and elastic modulus of HPC were obtained through the axis compressive strength test and compressive elastic modulus test.
(4) With28d as the curing period of concrete specimens, the flexural strength and flexural modulus are studied, and the rules of effects of the Nano SiO2and steel fiber influencing on flexural strength and flexural modulus of NHRC were obtained by three-point loading experiment.
(5) Based on experiments of three-point bending beam test, with28d as the curing period of concrete specimens whose size are100mm×100mm×400mm, the rules of the bend ductility influenced by the dosage of steel fiber were analyzed applying the method of ASTM C1018Toughness Index and DBV which is Germany fiber reinforced concrete standard.
(6) Through the three-point bending beam test, with a set of specimens whose size are100mm×100mm×515mm aged28d, the bend ductility was studied in this paper. Taking the effective crack length, instability fracture toughness, the crack fracture toughness, fracture energy, critical crack opening displacement and limit fracture opening displacement as evaluation indices, the basic influence rules of Nano SiO2and steel fiber on the fracture property of NHPC were obtained, and the notch sensitivity of the fracture specimens of NHPC was also studied.
引文
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[3]Non-destructive energy-dispersive diffraction imaging of the interior of bulk concrete. C Hall, S L Colston, A C Jupe, S D M Jacques, R Livingston, A O A Ramadan, A W Amde and P Barnes. Cement and Concrete Research 2000, v30,491～495.
[4]Li. Gengying. Properties of high-volume fly ash concrete incorporating nano-SiO2[J]. Cement and Concrete Research,2004,1043～1049
[5]Middendorf, Bernhard. Makro-Mikro-Nano:Nanotechnologie fur die Bindemittel-und Betonentwicklung=Macro-micro-nano:Nanotechnology for the development of binder and concrete[J]. Betonwerk und Fertigteil-Technik,2005
[6]Hui Li, Mao-hua Zhang, Jin-ping Ou. Abrasion resistance of concrete containing nano-particles for pavement[J]. Elsevier,2006,1263～1266
[7]Gunasekaran, Muthian. Lightweight Partially Nano-Particled Polymer Concrete:A New Concept for ElectricalInsulation[J]. Electrical Insulation Conference and Electrical Manufacturing Expo,2007,172～174
[8]Byung-Wan Jo, Seung-Kook Park, Do-Keun Kim. Mechanical properties of nano-MMT reinforced polymer composite and polymer concrete[J]. Construction and building Materials,2007,1351～1355
[9]CHEN Meng, GUAN Qiang. Study on Decontamination of Vehicle Emissions by Nano-TiO2 Sprayed on Highway Concrete Pavement [J]. Journal of Highway and Transportation Research and Development,2009
[10]Kuang Liang Qian,, Tao Meng, Xiao Qian Qian, ect. Research on some properties of fly ash concrete with nano-CaCO3 middle slurry[J]. Key Engineering Materials,2009
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