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首页> 外文期刊>Journal of structural fire engineering >Assessment of mechanical strength of nano silica concrete (NSC) subjected to elevated temperatures
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Assessment of mechanical strength of nano silica concrete (NSC) subjected to elevated temperatures

机译：评估高温下纳米二氧化硅混凝土（NSC）的机械强度

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Purpose - This paper aims to inspect the effect of indirect elevated temperature on the mechanical performance of nano silica concrete (NSC). The effect on both compressive and bond strengths is studied. Pre-and post-exposure to elevated temperature ranges of 200 to 600℃ is examined. A range covered by three percentages of 1.5,3 and 4.5 per cent nano silica (NS) in concrete mixes is tested. Design/methodology/approach - Pre-exposure mechanical tests (normal conditions - room temperature), using 3 per cent NS in the concrete mix, led to the highest increase in both compressive and bond strengths (43 per cent and 38.5 per cent, respectively), compared to the control mix without NS (based on 28-day results). It is worth noticing that adding NS to the concrete mixes does not have a significant effect on improving early-age strength. Besides, permeability tests are performed on NSC with different NS ratios. NS improved the concrete permeability for all tested percentages of NS. The maximum reduction is accompanied by the maximum percentage used (4.5 per cent NS in the NSC mix), reducing permeability to half the value of the concrete mix without NS. As for post-exposure to elevated-temperature mechanical tests, NSC with 1.5 per cent NS exhibited the lowest loss in strength owing to indirect heat exposure of 600℃; the residual compressive and bond strengths are 73 per cent and 35 per cent, respectively. Findings - The dispersion technique of NS has a key role in NSC-distinguished mechanical performance with NSC having lower NS percentages. NS significantly improved bond strength. NS has a remarkable effect on elevated temperature endurance. The bond strength of NSC exposed to elevated temperatures suffered faster deterioration than compressive strength of the exposed NSC. Research limitations/implications - A special scale factor needs to be investigated for the NSC. Originality/value - Although a lot of effort is placed in evaluating the benefits of using nano materials in structural concrete, this paper presents one of the first outcomes of the thermal effects on concrete mixes with NS as a partial cement replacement.
机译：目的-本文旨在检验间接高温对纳米二氧化硅混凝土（NSC）力学性能的影响。研究了对压缩强度和粘结强度的影响。检查了暴露于200至600℃高温之前和之后的情况。测试了混合料中1.5％，3％和4.5％的纳米二氧化硅（NS）的三个百分比所覆盖的范围。设计/方法/方法-暴露前机械测试（正常条件-室温），在混凝土混合物中使用3％的NS，导致抗压强度和粘结强度的增幅最大（分别为43％和38.5％） ），与不含NS的对照混合物相比（基于28天的结果）。值得注意的是，在混凝土混合物中添加NS对改善早期强度没有显着影响。此外，在具有不同NS比率的NSC上进行渗透性测试。 NS改善了所有测试百分比的NS的混凝土渗透性。最大的减少伴随着使用的最大百分比（NSC混合料中4.5％的NS），将渗透率降低到不含NS的混凝土混合料的一半。至于暴露于高温机械试验后，由于间接受热600℃，NS含量为1.5％的NSC的强度损失最低。残余抗压强度和粘结强度分别为73％和35％。研究结果-NS的分散技术在区分NSC的机械性能中起着关键作用，其中NSC的NS含量较低。 NS大大提高了粘结强度。 NS对高温耐受性有显着影响。暴露在高温下的NSC的粘合强度比暴露的NSC的抗压强度更快地劣化。研究的局限性/意义-需要为NSC研究特殊的比例因子。原创性/价值-尽管人们在评估使用纳米材料在结构混凝土中的益处方面付出了很多努力，但本文还是用NS作为部分水泥替代品对混凝土混合物产生热效应的首批成果之一。

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