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The effect of alkali-silica reaction on steel fiber-matrix bond characteristics of cement based mortars

机译：碱-硅反应对水泥基砂浆钢纤维-基体粘结特性的影响

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The effect of ASR on fiber-matrix bond behavior has been investigated in this research. The potentially reactive basaltic aggregate was chosen as a reactive material. Two series of specimens containing different amounts of supplementary cementing materials (SCMs) were prepared. One of them was cured in 1 M NaOH solution at 80 ℃, other series were cured in 80 ℃ water up to 150 days to obtain similar maturity. ASR expansion, single fiber pull-out load, debonding toughness, flexural and compressive strength was determined. Test results indicate that the ASR gel congestion in fiber-matrix interface increased the bond strength significantly during alkali exposure. Furthermore, SCMs are effective to reduce ASR expansion and to prevent the mechanical properties loss due to ASR. Micro-structural investigations revealed the reaction products having different morphology (fibrous, rosette type, network appearance, etc.) in alkali exposed specimens.
机译：在这项研究中已经研究了ASR对纤维-基体粘结行为的影响。选择潜在的反应性玄武骨料作为反应性材料。准备了两个系列的标本，其中包含不同量的辅助胶结材料（SCM）。其中一个在80℃的1 M NaOH溶液中固化，其他系列在80℃的水中固化150天以获得类似的成熟度。测定了ASR的膨胀，单纤维的拔出载荷，剥离强度，抗弯和抗压强度。测试结果表明，在碱接触过程中，纤维-基质界面中的ASR凝胶拥塞显着提高了粘结强度。此外，SCM可有效减少ASR膨胀并防止由于ASR造成的机械性能损失。微观结构研究表明，在暴露于碱的样品中，反应产物具有不同的形态（纤维，玫瑰花结型，网状外观等）。

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