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首页> 外文期刊>Journal of Failure Analysis and Prevention >Strength Evaluation of Concrete Made with Dug-up Gravel from Southwestern Nigeria
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Strength Evaluation of Concrete Made with Dug-up Gravel from Southwestern Nigeria

机译：尼日利亚西南部挖砂砾混凝土的强度评估

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摘要

Large expanses of natural deposits of gravel and sand are known to be available in many parts of the Southwestern Nigeria, which are being used for concrete production but with no standards. This study investigates the effects of using raw and washed dug-up gravel on the strength properties of concrete with a view to provide some standards for their usage. Field survey of quarry sites around Ile-Ife identified two commonly used dug-up gravel (Tiwantiwa), gravel A and (Majeroku), gravel B, which were selected for investigation. Prescribed mix proportions (measurements by weight) of 1:2:4 (cement:fine aggre-gate:washed/raw gravel) and 1:6 (cement:raw gravel) were used to produce the concrete cubes and beams for compressive and flexural strength tests. The results showed that using gravel A in raw form without sand and in washed form with sand have almost the same compressive strength (CS), while washing gravel B before use and with sand improved the CS of concrete. At 28 days, the CSs of concretes made from raw with no sand (RNS) of gravels A and B were 17.07 and 12.47 N/mm~2, while those of raw with sand (RWS) and washed with sand (WWS) were 14.73 and 16.80 N/mm~2 for gravel A and 11.93 and 16.00 N/mm~2 for gravel B, respectively. Characteristic strength of 15 N/mm~2 is recommended for concrete made with RNS and WWS of gravel A, while 11 and 14 N/mm~2 are recommended for those of gravel B, respectively.
机译：尼日利亚西南部许多地区都有大量的砾石和沙子自然沉积物，这些自然沉积物被用于混凝土生产，但没有标准。这项研究调查了使用生料和水洗挖出的碎石对混凝土强度特性的影响，以期为使用它们提供一些标准。对Ile-Ife周围采石场的现场调查确定了两种常用的挖出砾石（Tiwantiwa），砾石A和（Majeroku），砾石B，被选择进行调查。规定的混合比例（重量比）为1：2：4（水泥：细骨料：洗过的/未加工的砾石）和1：6（水泥：未加工的砾石）用于生产压缩和弯曲的混凝土立方体和梁强度测试。结果表明，使用未加砂的生料砾石A和用砂洗净的砾石A具有几乎相同的抗压强度（CS），而在使用前和用砂洗砾石B可以改善混凝土的CS。在第28天，砾石A和B的无砂生料（RNS）的CS值为17.07和12.47 N / mm〜2，而含砂生料（RWS）和用砂洗（WWS）的混凝土的CS值为14.73砾石A为16.80 N / mm〜2，砾石B为11.93 N / mm〜2。对于用砾石A的RNS和WWS制成的混凝土，建议其特性强度为15 N / mm〜2，而对于砾石B的建议分别为11和14 N / mm〜2。

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