Experimental study on compressive performance of new composite material “concrete confined with high-strength steel stranded wire meshes/ECC”
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摘要: 考虑混凝土强度、工程水泥基复合材料(ECC)强度和横向高强钢绞线配筋率等因素，研究新型复合材料“高强钢绞线网/ECC约束素混凝土”(以下简称HSE约束素混凝土)的受压性能。HSE约束素混凝土轴心受压试验显示，达到最大荷载的30%左右时，约束层ECC出现约为0.01 mm的竖向裂缝；约为最大荷载的85%时，表面最大裂缝宽度约为0.07 mm；达到最大荷载时，最大裂缝宽度仅为0.20 mm；说明该新型复合材料具有很好的裂缝分散和控制能力。之后荷载缓慢下降至最大荷载75%左右，第一根横向钢绞线断裂；达到破坏时裂而不碎，约束层和核心混凝土未发生黏结破坏，完整性良好。HSE约束素混凝土与素混凝土相比，其开裂应力提高了88%~116%；轴心抗压强度提高了21%~49%、轴心压应变增加了约45%；极限压应变提高了106%~175%。ECC强度和混凝土强度及横向钢绞线配筋率的提高，均增大其开裂和最大荷载及极限压应变。
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关键词:
- 高强钢绞线网/ECC /
- 约束素混凝土 /
- 新型复合材料 /
- 轴压性能 /
- 试验研究
Abstract: The compressive performance of new composite material “concrete confined with high-strength stainless steel stranded wire meshes/ECC” (hereinafter referred to as HSE confined concrete) was studied by considering the effects of parameters: concrete strength, strength of engineered cementitious composites (ECC) and reinforcement ratio of lateral high-strength stainless steel stranded wires. The axial compression test of HSE confined concrete shows that vertical cracks about 0.01 mm appears on ECC in constraint layer at about 30% of the peak load. When the applied load reaches about 85% and 100% of the peak load, the maximum crack width on the surfaces is about 0.07 mm, 0.20 mm, respectively. These phenomena show that the new composite material has excellent crack dispersion and crack-controlling ability. When the applied load decreases to 75% of the peak load, the first lateral steel stranded wires rupture for the first time. The HSE confined concrete specimens are cracked without breaking when completely destroyed, and maintain a good bond between the constraint layer and core concrete, which has a good integrity. Compared with the plain concrete column, the cracking stress, axial compressive strength, the axial compressive strain and ultimate compressive strain of HSE confined concrete are increased by 88%-116%, 21%-49%, 45%, 106%-175%, respectively. The increases of ECC strength, concrete strength grade and the reinforcement ratio of lateral steel stranded wires have improved the cracking load, peak load and ultimate compressive strain of HSE confined concrete. -
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图 4 D组素混凝土试件裂缝及破坏形态
Figure 4. Cracks and failure patterns of plain concrete specimens of group D
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图 5 HSE约束素混凝土试件裂缝及破坏形态
Figure 5. Cracks and failure patterns of HSE confined concrete column specimens
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图 6 HSE约束素混凝土试件等效压应力-压应变曲线
Figure 6. Compressive stress-strain curves of HSE confined concrete specimens under compression
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图 7 HSE约束素混凝土应力-ECC强度的关系
Figure 7. Stress of HSE confined concrete versus tensile strength of ECC
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图 8 HSE约束素混凝土应力-混凝土强度等级的关系
Figure 8. Stress of HSE confined concrete versus strength grade of concrete
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图 9 HSE约束素混凝土应力-横向钢绞线配筋率(ρw)的关系
Figure 9. Stress of HSE confined concrete versus reinforcement ratio of lateral steel stranded wires (ρw)
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图 10 HSE约束素混凝土极限压应变-横向钢绞线配筋率的关系
Figure 10. Ultimate compressive strain of HSE confined concrete versus the reinforcement ratio of lateral steel stranded wires
表 1 高强钢绞线网/工程水泥基复合材料(ECC)约束素混凝土(HSE约束素混凝土)试件参数设置
Table 1 Parameters of test concrete confined with high-strength stainless steel stranded wire meshes/ engineered cementitious composites (ECC) (HSE confined concrete) specimens
Group Number Water-binder ratio of ECC s/mm ρw/% A C30-E1-S50 0.25 50 0.18 C30-E2-S50 0.25 (Thickener) 50 0.18 C30-E3-S50 0.28 50 0.18 B C30-E1-S70 0.25 70 0.13 C30-E1-S50 0.25 50 0.18 C30-E1-S30 0.25 30 0.30 C C35-E1-S50 0.25 50 0.18 C40-E1-S50 0.25 50 0.18 D C30-E0-S0 − − − C35-E0-S0 − − − C40-E0-S0 − − − Notes: s—Spacing of lateral steel stranded wires; ρw—Reinforcement ratio of lateral steel stranded wires. 
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表 2 混凝土立方体抗压试验结果
Table 2 Test results of concrete cubes under compression
Strength grade of concrete fcu/MPa fco/MPa Ec/104MPa C30 33.5 22.4 3.0 C35 38.2 25.5 3.15 C40 42.9 28.6 3.25 Notes: fcu—Average values of cube compressive strength; fco—Axial compressive strength; Ec—Elastic modulus.
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表 3 ECC抗压和抗拉试验结果
Table 3 Test results of ECC under compression or tensile
Group fm,cu/MPa Ee/104MPa fm,t/MPa Ultimate tensile strain/% C30-E1-S50 38.8 1.71 4.52 2.58 C30-E2-S50 35.5 1.45 4.01 3.05 C30-E3-S50 33.5 1.27 3.34 3.01 C30-E1-S70 37.5 1.40 4.59 2.47 C30-E1-S50 37.1 1.38 4.63 2.47 C30-E1-S30 37.6 1.41 4.65 2.47 C35-E1-S50 38.1 1.53 4.72 2.59 C40-E1-S50 38.9 1.52 4.70 2.69 Notes: fm,cu—Compressive strength of ECC; Ee—Elastic modulus; fm,t—Tensile strength.
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表 4 HSE约束素混凝土主要试验结果
Table 4 Main test results of HSE confined concrete
Group number fm,t/MPa Pcr/kN Pu/kN Pcr/Pu εec0 Ps/kN Ps/P0 εecu fec0/MPa C30-E1-S50 4.52 500 1586 0.32 0.0034 1157 0.73 0.0076 30.47 C30-E2-S50 4.04 480 1542 0.31 0.0032 1156 0.75 0.0074 31.15 C30-E3-S50 3.34 470 1498 0.32 0.0033 1168 0.78 0.0073 28.21 C30-E1-S70 4.59 500 1510 0.33 0.0032 1144 0.76 0.0068 29.91 C30-E1-S50 4.63 510 1591 0.32 0.0034 1178 0.74 0.0078 31.61 C30-E1-S30 4.65 530 1660 0.32 0.0032 1260 0.75 0.0091 34.66 C35-E1-S50 4.72 540 1752 0.31 0.0033 1340 0.76 0.0076 34.42 C40-E1-S50 4.70 580 1926 0.33 0.0032 1466 0.76 0.0078 38.14 C30-E0-S0 − 250 930 0.27 0.0022 − − − 23.25 C35-E0-S0 − 275 1056 0.26 0.0023 − − − 26.40 C40-E0-S0 − 300 1147 0.26 0.0022 − − − 28.68 Notes: Pcr—Cracking load of specimens; Pu—Peak load; εec0—Compressive strain corresponding to peak load (axial compressive strain); Ps—Load at the first rupture of the lateral steel stranded wires; εecu—Strain at the first rupture of the lateral steel stranded wires (ultimate compressive strain); fec0—Peak load (axial compressive strength).
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