西安建筑科技大学学报(自然科学版)

为解决淡水河砂资源短缺、水泥高能耗等问题,采用海水海砂代替淡水河砂、粉煤灰代替50%的水泥制备海水海砂高掺量粉煤灰自密实混凝土(HVFA-SCC).同时,为解决海水海砂的使用引起钢筋锈蚀问题,采用纤维增强复合(FRP)筋代替钢筋.为研究玻璃纤维增强复合(GFRP)筋与海水海砂HVFA-SCC的粘结性能,本文制作了9组拉拔试件,重点讨论混凝土材料、筋材直径和筋材类型对粘结失效机理、粘结强度及粘结-滑移曲线的影响规律.并且,分析不同粘结滑移本构模型预测GFRP筋与海水海砂HVFA-SCC粘结-滑移曲线的准确性.最后,基于FRP筋增强混凝土的粘结-滑移曲线数据,校核双α粘结滑移本构模型参数.研究表明:排除混凝土强度影响后,混凝土类型对粘结强度的影响较小; 筋材直径的增加导致粘结强度降低,粘结失效机理由筋材树脂层剪切破坏转为树脂层磨损破坏; 筋材类型(GFRP筋、BFRP筋及带肋钢筋)对粘结强度基本无影响; 基于粘结-滑移曲线数据,获得了不同参数拉拔试件的双α粘结滑移模型表达式.

In order to solve the problems of shortage of freshwater river sand resources and high energy consumption of cement, seawater sea sand is used to replace freshwater river sand and fly ash is used to replace 50% of cement to produce seawater sea-sand high-volume fly ash self-compacting concrete(HVFA-SCC). Also, to solve the corrosion problem of steel bar induced by the use of sea water and sea-sand, fiber reinforced polymer(FRP)bar is used instead of steel bar. In this paper, nine groups of pull-out specimens were fabricated to study the bond behavior between glass fiber reinforced polymer(GFRP)bar and seawater sea-sand HVFA-SCC. The effects of the type of concrete materials, the diameter and type of reinforcing bar on bond failure mechanism, bond strength and bond-slip curves were discussed. Furthermore, the accuracy of different bond-slip constitutive models for predicting bond-slip curves between GFRP bars and seawater sea-sand HVFA-SCC was analyzed. Finally, the parameters of double α bond-slip model were verified by using the data of bond-slip curves of FRP reinforced concrete. The results showed that the type of concrete materials had little influence on the bond strength after excluding the effect of concrete strength. The bond strength decreased with the increase of reinforcement diameter, and the bond failure mechanism changed from shear failure to abrasion failure of the resin layer. The type of the reinforcing bar(GFRP bar, BFRP bar and steel bar)had barely effect on the bond strength. Based on the data of bond-slip curves, the expressions of double α bond-slip model for specimens with different parameters were obtained.

引言
1 试验概况
2 结果与分析
3 粘结滑移本构关系
4 结论

图1 筋材
Fig.1 The reinforcing bars

图2 筋材拉伸试验<br/>Fig.2 Tensile test of reinforcing bar

图2 筋材拉伸试验
Fig.2 Tensile test of reinforcing bar

表1 筋材属性<br/>Tab.1 Properties of reinforcing bars

表1 筋材属性
Tab.1 Properties of reinforcing bars

表2 混凝土配比(1 m3)<br/>Tab.2 Mix proportion of concrete(1 m3)

表2 混凝土配比(1 m3)
Tab.2 Mix proportion of concrete(1 m3)

表3 混凝土材料属性<br/>Tab.3 Properties of concrete materials

表3 混凝土材料属性
Tab.3 Properties of concrete materials

图3 拉拔试件的尺寸<br/>Fig.3 Size of pull-out specimen

图3 拉拔试件的尺寸
Fig.3 Size of pull-out specimen

图4 拉拔试件浇筑<br/>Fig.4 Casting of pull-out specimen

图4 拉拔试件浇筑
Fig.4 Casting of pull-out specimen

表4 拉拔试件设计<br/>Tab.4 Detail of pull-out specimens

表4 拉拔试件设计
Tab.4 Detail of pull-out specimens

图5 拉拔测试
Fig.5 Pull-out test

表5 试验结果汇总<br/>Tab.5 Summary of test results

表5 试验结果汇总
Tab.5 Summary of test results

图5 不同混凝土材料的拉拔试件界面破坏形态<br/>Fig.5 Interface failure modes of pull-out specimens with different concrete material

图5 不同混凝土材料的拉拔试件界面破坏形态
Fig.5 Interface failure modes of pull-out specimens with different concrete material

图6 不同筋材直径的拉拔试件界面破坏形态<br/>Fig.6 Interface failure modes of pull-out specimens with different diameter of bar

图6 不同筋材直径的拉拔试件界面破坏形态
Fig.6 Interface failure modes of pull-out specimens with different diameter of bar

图7 不同筋材类型的拉拔试件界面破坏形态<br/>Fig.7 Interface failure modes of pull-out specimens with different reinforcing bar

图7 不同筋材类型的拉拔试件界面破坏形态
Fig.7 Interface failure modes of pull-out specimens with different reinforcing bar

图8 混凝土材料对粘结强度的影响<br/>Fig.8 Influence of concrete material on bond strength

图8 混凝土材料对粘结强度的影响
Fig.8 Influence of concrete material on bond strength

图9 筋材直径对粘结强度的影响<br/>Fig.9 Influence of reinforcement material diameter on bond strength

图9 筋材直径对粘结强度的影响
Fig.9 Influence of reinforcement material diameter on bond strength

图10 筋材类型对粘结强度的影响<br/>Fig.10 Influence of reinforcement material type on bond strength

图10 筋材类型对粘结强度的影响
Fig.10 Influence of reinforcement material type on bond strength

图11 混凝土材料对粘结-滑移曲线的影响<br/>Fig.11 Influence of concrete material on bond-slip curves

图11 混凝土材料对粘结-滑移曲线的影响
Fig.11 Influence of concrete material on bond-slip curves

图12 筋材直径对粘结-滑移曲线的影响<br/>Fig.12 Influence of reinforcement material diameter on bond-slip curves

图12 筋材直径对粘结-滑移曲线的影响
Fig.12 Influence of reinforcement material diameter on bond-slip curves

图13 筋材类型对粘结-滑移曲线的影响<br/>Fig.13 Influence of reinforcement material type on bond-slip curves

图13 筋材类型对粘结-滑移曲线的影响
Fig.13 Influence of reinforcement material type on bond-slip curves

图14 不同模型预测结果与试验结果对比<br/>Fig.14 Comparison between prediction results of different models and experimental results

图14 不同模型预测结果与试验结果对比
Fig.14 Comparison between prediction results of different models and experimental results

表5 拉拔试件的参数结果<br/>Tab.5 Parameter results of pull-out specimens

表5 拉拔试件的参数结果
Tab.5 Parameter results of pull-out specimens

图15 双α模型预测结果与试验结果对比<br/>Fig.15 Comparison between prediction results of double α model and experimental results

图15 双α模型预测结果与试验结果对比
Fig.15 Comparison between prediction results of double α model and experimental results

[1]XIAO J, ZHANG Q, ZHANG P, et al. Mechanical behavior of concrete using seawater and sea-sand with recycled coarse aggregates[J]. Structural Concrete, 2019, 20(5):1631-1643.
[2]MATOS A M, Sousa-Coutinho J. Durability of mortar using waste glass powder as cement replacement[J]. Construction & Building Materials, 2012, 36:205-215.
[3]BILODEAU A, MALHOTRA V M. High-volume fly ash system: concrete solution for sustainable development[J]. ACI materials journal, 2000, 97(1): 41-48.
[4]ZHOU L Z, ZHENG Y, YU Y, et al. Experimental study of mechanical and fresh properties of HVFA-SCC with and without PP fibers[J]. Construction and Building Materials, 2021, 267(Januray18):1-15.
[5]ZHENG Y, ZHOU L, XIA L, et al. Investigation of the behaviour of SCC bridge deck slabs reinforced with BFRP bars under concentrated loads[J]. Engineering Structures, 2018, 171:500-515.
[6]肖建庄, 廖清香, 张青天, 等. 海水海砂再生混凝土与玻璃纤维增强塑料筋黏结性能[J]. 同济大学学报(自然科学版), 2018, 46(7):884-890.
[7]PARVIZI M, NOËL M, VASQUEZ J, et al. Assessing the bond strength of glass fiber reinforced polymer(GFRP)bars in portland cement concrete fabricated with seawater through pullout tests[J]. Construction and Building Materials, 2020,263(1):1-13.
[8]ZHENG Y, ZHOU N, ZHOU L, et al. Experimental and theoretical study of bond behaviour between FRP bar and high-volume fly ash-self-compacting concrete[J]. Materials and Structures, 2021, 54(1):1-17.
[9]ACI Committee. Guide test methods for fiber-reinforced polymer(FRP)composites for reinforcing or strengthening concrete and masonry structures: ACI 440-3R-12[S]. Farmingon Hills: American Concrete Institute, 2012.
[10]郭恒宁. FRP筋与混凝土粘结锚固性能的试验研究和理论分析[D]. 南京:东南大学, 2006.
[11]TIGHIOUART B, BENMOKRANE B, GAO D. Investigation of bond in concrete member with fibre reinforced polymer(FRP)bars[J]. Construction and Building Materials, 1998, 12(8):453-462.
[12]Soares S, Freitas N, Pereira E, et al. Assessment of GFRP bond behaviour for the design of sustainable reinforced seawater concrete structures[J]. Construction and Building Materials, 2020,231:1-17.

备注

引言

1 试验概况

2 结果与分析

3 粘结滑移本构关系

4 结论

期刊信息