文章基本信息

标题：Engineering properties of concrete made from gravels obtained in Southwestern Nigeria
本地全文：下载
作者：Nurain Sulymon ; Olatokunbo Ofuyatan ; Olowofoyeku Adeoye 等
期刊名称：Cogent Engineering
电子版ISSN：2331-1916
出版年度：2017
卷号：4
期号：1
页码：1295793
DOI：10.1080/23311916.2017.1295793
语种：English
出版社：Taylor and Francis Ltd
摘要：Abstract This study investigates the engineering properties of concrete produced from gravels and also verify the suitability of local gravel aggregates obtained from Southwestern Nigeria in place of crushed granite. Preliminary investigations were carried out in five selected states (Ogun, Oyo, Osun, Ondo and Ekiti) in Southwestern Nigeria to determine the registered gravel mining pits. Fifteen gravel mining pits based on age and scale of mining operations were selected for this study. Appropriate gravel constituents in concrete mix were determined using Gs factor. Concrete cubes 150 mm, 150 × 300 mm² cylinder modes and 150 × 150 × 750 mm³ beams were cast with collected gravel. 1:2:4 mix ratio was employed. Sieves analysis, density, water absorption were carried out on aggregates, while compressive, flexural and split-tensile strengths of the concrete were determined for 28 days using ASTM and BS methods. High concrete strengths resulted from high FM, low AAV and average Gs of gravels. Gravel location with highest compressive, flexural and split-tensile strengths of concretes had 24.8, 3.5 and 2.8 N/mm² satisfying the minimum requirement of BS 811:1997 while that with lowest strengths had 9.6, 2.2 and 1.7 N/mm², respectively. Sources of gravel highly influence compressive, flexural and split-tensile strengths of the cubes and beams.
关键词：coarse aggregates ; gravel aggregate ; concrete ; aggregates properties