Experimental study on mechanical properties of polypropylene fiber grouting material and its rebar sleeve connection
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摘要: 为改善装配式结构节点的力学连接性能，对聚丙烯(PP)纤维灌浆料进行材性性能及其钢筋套筒连接接头的力学性能研究。选用不同掺量、长度PP纤维的灌浆料进行力学性能试验，确定PP纤维最佳掺量(占普通(JZ)灌浆料的体积比)和长度分别为0.5%和9 mm。以JZ灌浆料为对照组，设置了4d、6d、8d(d为钢筋直径)3种锚固长度的套筒接头试件并进行单向拉伸试验，采用光纤光栅传感器(FBG)和应变片两种测试方法研究PP纤维灌浆料下的粘结应力分布。结果表明：PP纤维增强灌浆料钢筋套筒的最小锚固长度在6d以上；PP纤维能够有效改善接头韧性，增强了套筒的粘结锚固效果，提高了筋粘结应力分布均匀程度，使其呈“马鞍形”或“斜梯型”分布；FBG传感器与应变片所得结果基本一致，FBG传感器所采集的应变数据精度高于应变片。
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关键词:
- 聚丙烯(PP)纤维灌浆料 /
- 钢筋套筒连接接头 /
- 力学性能 /
- 单向拉伸试验 /
- 光纤光栅传感器(FBG) /
- 粘结应力
Abstract: To improve the mechanical connection performance of fabricated structural joint, the material properties of polypropylene (PP) fiber grouting material and the mechanical properties of its rebar sleeve joint were studied. The mechanical properties of grouting material with different PP fiber contents and length were tested. The optimum content (Volume ratio to ordinary (JZ) grouting material) and length of PP fiber is 0.5% and 9 mm, respectively. Taking JZ grouting material as control group, the anchorage length of 4d, 6d and 8d (d is the diameter of bar) was set and the uniaxial tensile test was carried out. The bond stress distribution of PP fiber grouting material was also studied by using Bragg Grating sensors (FBG) and strain gauge. The results show that: The minimum anchorage length of rebar sleeve of PP fiber reinforced grouting material is more than 6d; PP fiber can effectively improve the joint toughness, enhance the bond anchorage effect of the sleeve, and improve the uniform distribution of the bond stress of the reinforcement, which shows “saddle” or “inclined ladder” distribution; the results of FBG sensor and strain gauge are basically consistent, and the accuracy of strain data collected by FBG sensor is higher than that of strain gauge. -
图 2 应变片和光纤光栅传感器(FBG)布置示意图
Figure 2. Layout schematic diagram of strain gauges and fiber Bragg Grating (FBG) sensors
图 4 PP纤维长度和掺量对灌浆料流动度的影响规律
Figure 4. Effect of length and dosage parameters of PP fiber on fluidity of grouting material
图 5 PP纤维长度和掺量对灌浆料抗压强度的影响规律
Figure 5. Effect of length and dosage parameters of PP fiber on compressive strength of grouting material
图 6 PP纤维长度和掺量对灌浆料抗折强度的影响规律
Figure 6. Effect of length and dosage parameters of PP fiber on flexural strength of grouting material
图 7 钢筋灌浆套筒连接破坏形式
Figure 7. Failure mode of steel bar reinforced sleeve connection specimens
图 8 灌浆料套筒接头试件荷载-位移关系曲线
Figure 8. Load-displacement curves of grouting material rebar sleeve connection specimens
图 9 不同分级载荷下应变片测试灌浆料套筒接头试件的钢筋应力分布：(a) Y-JZ-8d; (b) Y-JZ-6d; (c) Y-JZ-4d; (d) Y-(0.5%PP9mm)/JZ-8d; (e) Y-(0.5%PP9mm)/JZ-6d; (f) Y-(0.5%PP9mm)/JZ-4d
Figure 9. Stress distribution of reinforcing steel bar in grout sleeve joint specimen measured by strain gauge under different step loads:(a) Y-JZ-8d; (b) Y-JZ-6d; (c) Y-JZ-4d; (d) Y-(0.5%PP9mm)/JZ-8d; (e) Y-(0.5%PP9mm)/JZ-6d; (f) Y-(0.5%PP9mm)/JZ-4d
图 10 不同分级载荷下FBG测试灌浆料套筒接头试件的钢筋应力分布：(a) F-JZ-8d; (b) F-JZ-6d; (c) F-JZ-4d; (d) F-(0.5%PP9mm)/JZ-8d; (e) F-(0.5%PP9mm)/JZ-6d; (f) F-(0.5%PP9mm)/JZ-4d
Figure 10. Stress distribution of reinforcing steel bar in grout sleeve joint specimen measured by FBG under different step loads: (a) F-JZ-8d; (b) F-JZ-6d; (c) F-JZ-4d; (d) F-(0.5%PP9mm)/JZ-8d; (e) F-(0.5%PP9mm)/JZ-6d; (f) F-(0.5%PP9mm)/JZ-4d
图 11 不同分级载荷下应变片测试灌浆料套筒接头试件的钢筋粘结应力分布：(a) Y-JZ-8d; (b) Y-JZ-6d; (c) Y-JZ-4d; (d) Y-(0.5%PP9mm)/JZ-8d; (e) Y-(0.5%PP9mm)/JZ-6d; (f) Y-(0.5%PP9mm)/JZ-4d
Figure 11. Bond stress distribution of reinforcing steel bar in grout sleeve joint specimen measured by strain gauge under different step loads:(a) Y-JZ-8d; (b) Y-JZ-6d; (c) Y-JZ-4d; (d) Y-(0.5%PP9mm)/JZ-8d; (e) Y-(0.5%PP9mm)/JZ-6d; (f) Y-(0.5%PP9mm)/JZ-4d
图 12 不同分级载荷下FBG测试灌浆料套筒接头试件的钢筋粘结应力分布：(a) F-JZ-8d; (b) F-JZ-6d; (c) F-JZ-4d; (d) F-(0.5%PP9mm)/JZ-8d; (e) F-(0.5%PP9mm)/JZ-6d; (f) F-(0.5%PP9mm)/JZ-4d
Figure 12. Bond stress distribution of reinforcing steel bar in grout sleeve joint specimen measured by FBG under different step loads:(a) F-JZ-8d; (b) F-JZ-6d; (c) F-JZ-4d; (d) F-(0.5%PP9mm)/JZ-8d; (e) F-(0.5%PP9mm)/JZ-6d; (f) F-(0.5%PP9mm)/JZ-4d
表 1 聚丙烯(PP)纤维参数
Table 1. Parameters of polypropylene (PP) fiber
Density/(g·cm−3) Diameter/μm Compressive strength/MPa Young’s modulus/MPa Elongation at break/% 0.91 27 556 4186 18 
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表 2 普通(JZ)灌浆料的力学性能试验结果
Table 2. Main mechanical test results of ordinary (JZ) grouting materials
Specimen Fluidity/mm Compressive strength/MPa Flexural strength/MPa Initial 30 min JZ 390 382 74 13.8
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表 3 灌浆料套筒接头试件单向拉伸力学性能及破坏模式
Table 3. Uniaxial tensile mechanical properties and failure mode of grouting material rebar sleeve connection specimens
Specimen $ {P}_{\rm{y}} $/kN $ {P}_{\rm{u}}/ $kN $ {\tau }_{\rm{max}} $/MPa $ {S}_{\rm{q}} $/mm Failure mode Y-JZ-8d 114.1 163.1 >20.04 20.09 Bar fracture Y-JZ-6d 113.8 157.4 25.79 14.13 Bar pull-out Y-JZ-4d 113.1 132.5 32.56 2.77 Bar pull-out Y-(0.5%PP9mm)/JZ-8d 113.8 163.3 >20.06 23.71 Bar fracture Y-(0.5%PP9mm)/JZ-6d 113.8 161.9 26.52 17.40 Bar pull-out Y-(0.5%PP9mm)/JZ-4d 113.9 134.5 33.05 2.67 Bar pull-out F-JZ-8d 114.0 163.2 >20.03 23.57 Bar fracture F-JZ-6d 113.2 162.6 25.69 15.46 Bar pull-out F-JZ-4d 114.0 127.8 31.40 2.71 Bar pull-out F-(0.5%PP9mm)/JZ-8d 113.6 163.7 >20.07 23.70 Bar fracture F-(0.5%PP9mm)/JZ-6d 113.6 166.8 26.64 18.24 Bar pull-out F-(0.5%PP9mm)/JZ-4d 114.9 128.3 33.05 2.08 Bar pull-out Notes: Y and F—Strain gauge and FBG; JZ and PP—JZ and PP grouting material;8d—Anchorage length is 8d. $ {P}_{\rm{y}} $ and $ {P}_{\rm{u}} $—Yield load and ultimate force. $ {\tau }_{\rm{max}} $—Ultimate bond strength, in the case of bar pull-out, it is the bond strength corresponding to the maximum tensile load; in the case of bar fracture, it must be greater than this value. $ {S}_{\rm{q}} $—Ultimate bond strength whose length from the starting point of strengthening to the point of ultimate tensile strength.
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