多種鋼纖維對(duì)超高性能混凝土力學(xué)性能影響的比較研究
發(fā)布時(shí)間：2019-03-21 08:09
【摘要】：摘要：本學(xué)位論文主要進(jìn)行了多種異形鋼纖維對(duì)超高性能混凝土(UHPC)力學(xué)性能影響的試驗(yàn)研究。 文章測(cè)定了2種不同水膠比(0.18、0.26)、6種不同抗拉強(qiáng)度及形狀的鋼纖維摻入的混凝土試件,經(jīng)標(biāo)準(zhǔn)養(yǎng)護(hù)28d后的基本力學(xué)性能(立方體抗壓強(qiáng)度、軸心抗壓強(qiáng)度、劈裂抗拉強(qiáng)度、靜力受壓彈性模量)及斷裂能,研究不同種類(lèi)的鋼纖維對(duì)其力學(xué)性能的影響。 基本力學(xué)性能試驗(yàn)結(jié)果表明：(1)總體而言鋼纖維的摻入對(duì)0.26水膠比HPC及0.18水膠比UHPC的抗壓強(qiáng)度略有提升。波紋形鋼纖維對(duì)0.18水膠比UHPC抗壓強(qiáng)度有相對(duì)顯著的提高,而端鉤形鋼纖維則對(duì)0.26水膠比HPC抗壓強(qiáng)度有所提高。(2)鋼纖維的摻入對(duì)HPC及UHPC劈裂抗拉強(qiáng)度的提升主要與鋼纖維自身抗拉強(qiáng)度及鋼纖維的長(zhǎng)徑比呈正相關(guān)。表面附著橡膠的高強(qiáng)度環(huán)保波紋形鋼纖維對(duì)HPC韌性改善效果在試驗(yàn)所用6種鋼纖維中最為突出。(3)抗拉強(qiáng)度590MPa、長(zhǎng)徑比相對(duì)較低的兩種鋼纖維對(duì)混凝土的各項(xiàng)力學(xué)性能并無(wú)明顯提升,甚至出現(xiàn)了UHPC抗壓強(qiáng)度降低的現(xiàn)象,表明該類(lèi)型的鋼纖維不宜用于超高性能混凝土 斷裂能試驗(yàn)結(jié)果表明：(1)環(huán)保波紋形鋼纖維對(duì)HPC及UHPC斷裂能提升最明顯,在其外部附著橡膠的輔助作用下,能夠阻止或減緩混凝土裂紋的產(chǎn)生。(2)自身抗拉強(qiáng)度為2000MPa的鋼纖維在拔出時(shí)變形的程度不大,擁有更多彎曲形態(tài)的波紋形鋼纖維會(huì)比端鉤形鋼纖維更好地發(fā)揮其在裂縫間的橋接作用。(3)同種強(qiáng)度的普通端鉤形鋼纖維與波紋形鋼纖維在UHPC中所測(cè)得的斷裂能值差別不大,但在HPC中端鉤形鋼纖維明顯比波紋形鋼纖維更好地提升了混凝土的斷裂能。(4)低長(zhǎng)徑比的鞍山波紋形鋼纖維與螺紋形鋼纖維對(duì)UHPC斷裂能的提升效果不明顯的情況,與其鋼材強(qiáng)度偏低存在主要聯(lián)系,且這兩種鋼纖維的脆性較大,在UHPC中的摻入屬于增加了界面薄弱層。 上述試驗(yàn)結(jié)果表明,鋼纖維在高性能混凝土與超高性能混凝土中起到的作用與其自身抗拉強(qiáng)度、長(zhǎng)徑比、形狀均有聯(lián)系,且本文試驗(yàn)中所用各鋼纖維對(duì)不同混凝土力學(xué)性能的影響規(guī)律不同,需綜合考慮鋼纖維的各項(xiàng)因素與混凝土自身強(qiáng)度的相匹配性。綜合基本力學(xué)性能與斷裂能的試驗(yàn)情況,可知抗拉強(qiáng)度為590MPa的波紋形與螺紋形鋼纖維總體不適用于UHPC,而高抗拉強(qiáng)度的環(huán)保波紋形鋼纖維與長(zhǎng)徑比較大的端鉤形鋼纖維對(duì)HPC的力學(xué)性能改善效果最為明顯。
[Abstract]:Abstract: this thesis mainly deals with the effects of various special-shaped steel fibers on the mechanical properties of ultra-high performance concrete (UHPC). In this paper, the basic mechanical properties (cube compressive strength, axial compressive strength) of two concrete specimens with different water binder ratios (0.18,0.26), six kinds of steel fibers with different tensile strength and shape after standard curing for 28 days were measured. Splitting tensile strength, elastic modulus of static compression) and fracture energy were used to study the effects of different kinds of steel fibers on their mechanical properties. The experimental results of basic mechanical properties show that: (1) the compressive strength of 0.26 water-binder ratio and 0.18-water-adhesive ratio UHPC is slightly increased by the addition of the total steel fiber to 0.26 water-binder ratio HPC and 0.18-water-adhesive ratio UHPC. The compressive strength of corrugated steel fiber is higher than that of UHPC. (2) the increase of splitting tensile strength of HPC and UHPC is positively correlated with the tensile strength of steel fiber itself and the ratio of length to diameter of steel fiber. (2) the increase of tensile strength of HPC and UHPC with the addition of steel fiber is positively correlated with the tensile strength of steel fiber itself and the ratio of length to diameter of steel fiber. The compressive strength of end hook steel fiber is higher than that of HPC. The high strength and environmental protection corrugated steel fiber attached to the surface of rubber has the most outstanding effect on the toughness improvement of HPC. (3) the tensile strength of 590MPa is the most prominent among the 6 kinds of steel fibers used in the test. The two kinds of steel fibers with relatively low aspect ratio have no obvious improvement on the mechanical properties of the concrete, and even have the phenomenon of the decrease of the compressive strength of UHPC. It is shown that this type of steel fiber is not suitable for testing the fracture energy of ultra-high performance concrete. The results show that: (1) the environmental protection corrugated steel fiber enhances the fracture energy of HPC and UHPC most obviously, under the auxiliary effect of the rubber attached to the outer part of the steel fiber. It can prevent or slow down the formation of concrete cracks. (2) the steel fiber with its own tensile strength of 2000MPa does not deform greatly when it is pulled out. Corrugated steel fibers with more bending shape will play a better role in bridging between cracks than end hook steel fibers. (3) the fracture of common end hook steel fibers with same strength and corrugated steel fibers measured in UHPC is better than that of end hook steel fibers. (3) the fracture of common end hook steel fibers with the same strength and that of corrugated steel fibers is better than that of end hook steel fibers. There's not much difference in the value of crack energy, However, in HPC, the fracture energy of concrete is obviously improved by end hook steel fiber compared with corrugated steel fiber. (4) the effect of Anshan corrugated steel fiber with low aspect ratio on UHPC fracture energy is not obvious. It is mainly related to the low strength of the steel, and the brittleness of the two kinds of steel fibers is greater, and the addition of UHPC into the steel fiber is an increase of the interface weak layer. The results show that the effect of steel fiber on high-performance concrete and ultra-high performance concrete is related to its own tensile strength, length-diameter ratio and shape, and that the steel fiber plays an important role in high-performance concrete and ultra-high performance concrete. The influence of the steel fiber on the mechanical properties of the concrete is different in this paper. It is necessary to consider the matching between the steel fiber and the strength of the concrete. Based on the experimental results of basic mechanical properties and fracture energy, it is known that the corrugated and threaded steel fibers with tensile strength of 590MPa are not suitable for UHPC, in general. But the environmental protection corrugated steel fiber with high tensile strength and the end hook steel fiber with larger length and diameter have the most obvious effect on improving the mechanical properties of HPC.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TU528.572
本文編號(hào)：2444750
[Abstract]:Abstract: this thesis mainly deals with the effects of various special-shaped steel fibers on the mechanical properties of ultra-high performance concrete (UHPC). In this paper, the basic mechanical properties (cube compressive strength, axial compressive strength) of two concrete specimens with different water binder ratios (0.18,0.26), six kinds of steel fibers with different tensile strength and shape after standard curing for 28 days were measured. Splitting tensile strength, elastic modulus of static compression) and fracture energy were used to study the effects of different kinds of steel fibers on their mechanical properties. The experimental results of basic mechanical properties show that: (1) the compressive strength of 0.26 water-binder ratio and 0.18-water-adhesive ratio UHPC is slightly increased by the addition of the total steel fiber to 0.26 water-binder ratio HPC and 0.18-water-adhesive ratio UHPC. The compressive strength of corrugated steel fiber is higher than that of UHPC. (2) the increase of splitting tensile strength of HPC and UHPC is positively correlated with the tensile strength of steel fiber itself and the ratio of length to diameter of steel fiber. (2) the increase of tensile strength of HPC and UHPC with the addition of steel fiber is positively correlated with the tensile strength of steel fiber itself and the ratio of length to diameter of steel fiber. The compressive strength of end hook steel fiber is higher than that of HPC. The high strength and environmental protection corrugated steel fiber attached to the surface of rubber has the most outstanding effect on the toughness improvement of HPC. (3) the tensile strength of 590MPa is the most prominent among the 6 kinds of steel fibers used in the test. The two kinds of steel fibers with relatively low aspect ratio have no obvious improvement on the mechanical properties of the concrete, and even have the phenomenon of the decrease of the compressive strength of UHPC. It is shown that this type of steel fiber is not suitable for testing the fracture energy of ultra-high performance concrete. The results show that: (1) the environmental protection corrugated steel fiber enhances the fracture energy of HPC and UHPC most obviously, under the auxiliary effect of the rubber attached to the outer part of the steel fiber. It can prevent or slow down the formation of concrete cracks. (2) the steel fiber with its own tensile strength of 2000MPa does not deform greatly when it is pulled out. Corrugated steel fibers with more bending shape will play a better role in bridging between cracks than end hook steel fibers. (3) the fracture of common end hook steel fibers with same strength and corrugated steel fibers measured in UHPC is better than that of end hook steel fibers. (3) the fracture of common end hook steel fibers with the same strength and that of corrugated steel fibers is better than that of end hook steel fibers. There's not much difference in the value of crack energy, However, in HPC, the fracture energy of concrete is obviously improved by end hook steel fiber compared with corrugated steel fiber. (4) the effect of Anshan corrugated steel fiber with low aspect ratio on UHPC fracture energy is not obvious. It is mainly related to the low strength of the steel, and the brittleness of the two kinds of steel fibers is greater, and the addition of UHPC into the steel fiber is an increase of the interface weak layer. The results show that the effect of steel fiber on high-performance concrete and ultra-high performance concrete is related to its own tensile strength, length-diameter ratio and shape, and that the steel fiber plays an important role in high-performance concrete and ultra-high performance concrete. The influence of the steel fiber on the mechanical properties of the concrete is different in this paper. It is necessary to consider the matching between the steel fiber and the strength of the concrete. Based on the experimental results of basic mechanical properties and fracture energy, it is known that the corrugated and threaded steel fibers with tensile strength of 590MPa are not suitable for UHPC, in general. But the environmental protection corrugated steel fiber with high tensile strength and the end hook steel fiber with larger length and diameter have the most obvious effect on improving the mechanical properties of HPC.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TU528.572
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