FEA modelling of fracture toughness of steel fibre-reinforced geopolymer composites
FEA modelling of fracture toughness of steel fibre-reinforced geopolymer composites
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DOI：
10.1016/j.matdes.2015.03.029
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发表时间：
2015-07-05
影响因子：
8.4
通讯作者：
Pouraliakbar, Hesam
中科院分区：
文献类型：
--
作者：
Sanjayan, Jay G.;Nazari, Ali;Pouraliakbar, Hesam
在这项研究中，钢纤维增强铝硅酸盐地质聚合物的断裂韧性进行了实验研究，并通过显式有限元法建模。制备了9种具有不同碱激发剂与粉煤灰的重量比、氢氧化钠与硅酸钠的重量比、氢氧化钠浓度和养护温度的地聚合物浆体，并通过预缺口三点弯曲试样测量了它们的断裂韧性。然后通过替代2、3和5vol. %用直径为0.5 mm、长度为30 mm的钢纤维对土聚物浆体进行了拉伸试验。探讨了四种不同的参数对实验和预测断裂韧性的影响。结果表明，NaOH与硅酸钠和碱激发剂与粉煤灰的重量比不会导致实验结果与预测结果之间的任何偏差。另一方面，NaOH浓度和固化温度是最显着的参数，导致预测结果与实验的偏差。一般来说，它是可能的，使用所提出的建模过程来预测断裂韧性的钢纤维增强地质聚合物与合理的近似。(C)2015爱思唯尔有限公司版权所有。
In this study, fracture toughness of steel fibre-reinforced aluminosilicate geopolymers is investigated experimentally and is modelled by explicit finite element method. Nine geopolymeric pastes with various alkali activators to fly ash weight ratios, sodium hydroxide (NaOH) to sodium silicate weight ratios, NaOH concentrations and curing temperatures were prepared and their fracture toughness was measured by pre-notched three point bending specimens. All samples were then reinforced by substituting of 2, 3 and 5 vol.% of geopolymeric pastes by steel fibres with diameter and length of 0.5 and 30 mm respectively. The effects of four different parameters on experimental and predicted fracture toughness were probed. Results indicated that NaOH to sodium silicate and alkali activator to fly ash weight ratios do not cause any deviation between experimental and predicted results. On the other hand, NaOH concentration and curing temperature were the most significant parameters that caused deviation of predicted results from experimental ones. Generally, it is possible to use the proposed modelling procedure to predict fracture toughness of steel-fibre reinforced geopolymers with a reasonable approximation. (C) 2015 Elsevier Ltd. All rights reserved.