水泥基材料的自愈合及與BFRP筋復合結構的力學性能研究
[Abstract]:Concrete cracking can lead to a series of durability problems, but the conventional crack repair method is time-consuming and laborious, but it can not achieve good results. Therefore, fiber reinforced cement matrix composites with crack limiting ability and stainless high strength FRP bars can be used as good substitute materials for reinforced concrete. In addition, cement matrix composites also have a certain ability of self-healing of cracks. Because the two materials complement each other, they are expected to improve the cracking and corrosion of traditional reinforced concrete structures. In order to study the tensile properties and self-healing ability of fiber reinforced cement matrix composites and the mechanical properties of composite structures of cement matrix composites and BFRP tendons, related experiments were carried out in this paper. The effects of mineral admixtures on the tensile properties of cement matrix composites and the self-healing properties of composites based on impermeability, strength recovery and crack change were evaluated. The mechanical properties of composite-BFRP composite beams and the effect of crack self-healing on the mechanical properties of composite beams are also discussed. It is found that slag can enhance the structure density and permeability resistance of cement-based composites at 28 days of age, and the composites with fly ash, metakaolin, silica fume and slag have 2% fiber volume. The ultimate tensile strength and ultimate strain can reach 3.86 MPa and 2.2, and the crack width of the material can be well limited by the development of multiple cracks during tension, and the excellent self-healing ability of crack is shown under the condition of dry-wet cycle curing, the tensile strength and the ultimate strain can reach 3.86 MPa and 2.2, respectively. The strength of cracking material after dry and wet cycle curing for 28 days can reach 1177.The dry and wet cycle is the best curing condition for composite material self-healing considering the effect of self-healing and practical operation. The initial crack width plays a leading role in fracture self-healing. Cracks less than 50 渭 m can basically heal, while those larger than 150 渭 m have no obvious healing effect. When the composite material is used to replace the tensile zone of 70 mm concrete beam and the normal carbon steel is replaced by the FRP bar, the flexural capacity of the beam is increased by about 10% compared with that of the BFRP bar, and the overall stiffness of the beam is obviously increased. The deflection of the composite beam decreases obviously when it is destroyed and the composite beam is preloaded and subjected to dry and wet cycle curing for 28 days the overall stiffness of the beam recovers obviously and the micro-crack healing effect is better.
【學位授予單位】:浙江大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TU528
【參考文獻】
相關期刊論文 前10條
1 曾俊杰;范志宏;熊建波;王勝年;;混凝土裂縫滲透結晶自愈合評價方法研究[J];硅酸鹽通報;2015年10期
2 闞黎黎;王明智;史建武;施惠生;;超高韌性水泥基復合材料自愈合研究進展[J];功能材料;2015年05期
3 張彥秋;尤立霞;;我國危橋存在的主要問題及原因分析[J];科技致富向導;2013年29期
4 何小芳;盧軍太;李小楠;卿培良;曹新鑫;;硅灰對混凝土性能影響的研究進展[J];硅酸鹽通報;2013年03期
5 于良;程華;朱國華;;碳纖維混凝土抗?jié)B試驗研究[J];重慶建筑;2013年01期
6 翁興中;沈哲;李永毅;胡栓科;;聚酯纖維引氣道面混凝土凍融強度試驗研究[J];混凝土與水泥制品;2013年01期
7 朱方之;趙鐵軍;王鵬剛;馬志鳴;;混凝土毛細吸水影響因素探討[J];西安建筑科技大學學報(自然科學版);2012年05期
8 路璐;李興貴;;大體積混凝土裂縫控制的研究與進展[J];水利與建筑工程學報;2012年01期
9 王蕭蕭;申向東;;不同摻量粉煤灰輕骨料混凝土的強度試驗研究[J];硅酸鹽通報;2011年01期
10 高淑玲;劉波;袁全;陳培;;PVA-FRCCs粘貼式薄板單軸直接拉伸試驗研究[J];東南大學學報(自然科學版);2010年S2期
相關會議論文 前2條
1 薛偉辰;;FRP筋增強混凝土結構研究的一些新進展[A];第十四屆中國科協(xié)年會第11分會場:低成本、高性能復合材料發(fā)展論壇論文集[C];2012年
2 汪智勇;葉家元;張文生;;偏高嶺土和硅灰對水泥體系水化影響[A];中國硅酸鹽學會水泥分會首屆學術年會論文集[C];2009年
相關博士學位論文 前1條
1 王艷;一般大氣環(huán)境多因素作用下鋼纖維混凝土耐久性研究[D];西安建筑科技大學;2011年
相關碩士學位論文 前4條
1 方廷;FRP筋-ECC-混凝土復合結構力學性能研究[D];浙江大學;2015年
2 黃艷竹;纖維增韌水泥基復合材料的纖維界面處理及直拉性能的研究[D];北京交通大學;2012年
3 饒芳芬;粉煤灰對超高韌性水泥基復合材料彎曲性能的影響試驗研究[D];大連理工大學;2008年
4 包啟明;民用建筑混凝土結構裂縫的鑒定、修補及加固[D];浙江大學;2006年
,本文編號:2264210
本文鏈接:http://www.wukwdryxk.cn/jianzhugongchenglunwen/2264210.html