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首页> 美国卫生研究院文献>Materials >Fracture Properties and Softening Curves of Steel Fiber-Reinforced Slag-Based Geopolymer Mortar and Concrete
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Fracture Properties and Softening Curves of Steel Fiber-Reinforced Slag-Based Geopolymer Mortar and Concrete

机译：钢纤维增强渣基地质聚合物砂浆和混凝土的断裂特性和软化曲线

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摘要

Adding short steel fibers into slag-based geopolymer mortar and concrete is an effective method to enhance their mechanical properties. The fracture properties of steel fiber-reinforced slag-based geopolymer concrete/mortar (SGC/SGM) and unreinforced control samples were compared through three-point bending (TPB) tests. The influences of steel fiber volume contents (1.0%, 1.5% and 2.0%) on the fracture properties of SGC and SGM were studied. Load-midspan deflection (P-δ) curves and load-crack mouth opening displacement (P-CMOD) curves of the tested beams were recorded. The compressive and splitting tensile strengths were also tested. The fracture energy, flexural strength parameters, and fracture toughness of steel fiber-reinforced SGC and SGM were calculated and analyzed. The softening curves of steel fiber-reinforced SGC and SGM were determined using inverse analysis. The experimental results show that the splitting tensile strength, fracture energy, and fracture toughness are significantly enhanced with fiber incorporation. A strong correlation between the equivalent and residual flexural strengths is also observed. In addition, the trilinear strain-softening curves obtained by inverse analysis predict well of the load-displacement curves recorded from TPB tests.
机译：在矿渣基地聚合物砂浆和混凝土中添加短钢纤维是提高其机械性能的有效方法。通过三点弯曲（TPB）测试比较了钢纤维增强的矿渣基地质聚合物混凝土/砂浆（SGC / SGM）和未增强的控制样品的断裂性能。研究了钢纤维体积含量（1.0％，1.5％和2.0％）对SGC和SGM断裂性能的影响。记录了测试梁的载荷中跨挠度（P-δ）曲线和载荷裂纹张口张开位移（P-CMOD）曲线。还测试了抗压强度和劈裂抗张强度。计算并分析了钢纤维增强的SGC和SGM的断裂能，抗弯强度参数和断裂韧性。用反分析法测定了钢纤维增强的SGC和SGM的软化曲线。实验结果表明，掺入纤维可以显着提高劈裂抗张强度，断裂能和断裂韧性。还观察到等效弯曲强度和残余弯曲强度之间的强相关性。此外，通过反分析获得的三线性应变软化曲线可以很好地预测TPB测试记录的载荷-位移曲线。

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