Material wastage on construction sites can contribute to cost overruns. Research to provide evidence of the extent of material wastages’ contribution to cost overruns on construction sites is based mostly on surveys. Thus, the actual contribution is not yet ascertained. The purpose of this article is to report the results of an objectively investigated study on the contributions of material waste to project-cost overrun. The methodological approach adopted for the study is the quantitative technique that is rooted in the positivist paradigm. The investigation included ongoing building construction projects within Abuja, Nigeria, from which a sample of 31 public and private projects was purposefully selected (project value of ₦1.6 billion Naira and above). The data for this research were sourced from the field investigation (measurement of the volume of material waste) and data from the archival records (drawings, bills of quantities, project-progress reports, and specifications) on material waste and cost overruns. The collected data were analysed using the Pearson moment correlation and the descriptive method. The research results revealed a statistically significant relationship between material waste and cost overrun. This implies that any increase in the volume of material waste would lead to a corresponding increase in the amount of cost overrun. The results showed that the significant percentage contribution of material waste to project-cost overrun ranges from 1.96% to 8.01%, with an average contribution of 4.0% to project-cost overruns. It is recommended that construction professionals be well informed of the consequences of material waste contributions to project-cost overrun at an early stage, in order to enable the professionals to evaluate the extent to which these consequences could be minimised. Keywords : Cost overrun, construction waste, construction industry, material waste, Nigeria

中文翻译：

---

尼日利亚阿布贾建筑材料浪费对项目成本超支的贡献

施工现场的材料浪费可能导致成本超支。提供证据证明材料浪费对建筑工地成本超支的影响程度主要是基于调查。因此，尚未确定实际贡献。本文的目的是报告有关材料浪费对项目成本超支的贡献的客观调查研究的结果。本研究采用的方法论方法是基于实证主义范式的定量技术。调查包括尼日利亚阿布贾正在进行的建筑项目，从中有意选择了31个公共和私人项目的样本（项目价值16亿奈拉及以上）。这项研究的数据来自实地调查（材料浪费量的测量）和档案记录（图纸，工程量清单，项目进度报告和规格）的数据，涉及材料浪费和成本超支。使用皮尔逊矩相关性和描述性方法分析收集的数据。研究结果表明，物料浪费与成本超支之间存在统计学上的显着关系。这意味着材料浪费量的任何增加都会导致超支成本的相应增加。结果表明，材料浪费对项目成本超支的显着百分比范围为1.96％至8.01％，平均对项目成本超支的比例为4.0％。建议尽早向建筑专业人员充分了解材料浪费对项目成本超支的影响，以便使专业人员评估可将这些影响最小化的程度。关键字：成本超支，建筑垃圾，建筑业，材料垃圾，尼日利亚