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首页> 外文期刊>Arabian Journal for Science and Engineering >Deformation Properties of Nano‑Silica Modified Concrete Mixtures under Uniaxial Compression Loading
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Deformation Properties of Nano‑Silica Modified Concrete Mixtures under Uniaxial Compression Loading

机译：单轴压缩负荷下纳米二氧化硅改性混凝土混合物的变形性能

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The enhancement that nano-silica (NS) constitutes in the microstructure of concrete would affect its deformation behavior. In this work, the pre-peak and post-peak stress–strain diagram characteristics of concrete mixtures with NS (1.5% of cement by wt.) under uniaxial compression were investigated. The results were compared with the mixtures containing micro-silica (MS) (7.3% of cement by wt.). Aggregate characteristics in the range of 16 to 22 mm, as another variable, were also changed by utilizing river gravel (RG Ⅱ) or crushed sandstone (CS Ⅱ). Compared to reference concrete, the addition of NS did not improve the compressive strength and modulus of elasticity significantly. However, the addition of only 1.5% NS significantly affected the stress–strain diagram characteristics, such as discontinuity and critical stress limits before the peak load. Relative to the mixtures containing MS, the effect of NS on the pre-peak region was more significant. For example, when the mixtures containing RG Ⅱ as coarse aggregate are considered, with respect to reference mixture, the increase in normalized discontinuity stress limits at 28 days was found as 52% and 26%, respectively, for the mixtures containing NS and MS. However, in the same order, the increase in 28-day compressive strength was just 8.1% and 5.2%. Post-peak behavior of the mixtures also indicated that the fracture of concrete is more brittle when MS or NS is used. Among these, the effect of NS on the post-peak region was found to be more dominant.
机译：纳米二氧化硅（NS）构成在混凝土的微观结构中的增强将影响其变形行为。在这项工作中，研究了在单轴压缩下，在单轴压缩下具有NS（1.5％水泥的混凝土混合物的预峰值和后峰值应力 - 应变图特性。将结果与含有微二氧化硅（MS）的混合物进行比较（通过WT的7.3％的水解）。通过利用河砾石（RGⅡ）或碎砂岩（CSⅡ），还改变了16至22mm的聚集特性。与参考混凝土相比，NS的添加没有显着提高抗压强度和弹性模量。然而，只有1.5％NS的添加显着影响了应力 - 应变图特性，例如在峰值负荷之前的不连续性和临界应力限制。相对于含有MS的混合物，NS对预峰区域的影响更大。例如，当考虑含有RgⅡ作为粗骨料的混合物，相对于参考混合物，对于含有NS和MS的混合物，分别为52％和26％，分别为52％和26％的归一化性不连续压力限制的增加。然而，在相同的顺序中，28天的抗压强度的增加仅为8.1％和5.2％。混合物的后峰值行为还表明，当使用MS或NS时，混凝土的骨折更脆。其中，发现NS对峰值峰值区域的影响更大。

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