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TEST METHODS ADAPTED TO ALTERNATIVE AGGREGATES

机译:适用于替代骨料的测试方法

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摘要

Due to a shortage in natural aggregate resources a change towards more sustainable production and consumption is urgently required. Utilisation of alternative aggregate materials is one of the solutions. The alternative aggregates are in many cases suitable to be used for civil engineering works. In order to use them on a routine basis, we need relevant standardised test methods to assess their suitability. This paper presents the main results from 3 joint inter-Nordic research projects assessing whether standardised aggregate test methods are suitable also for recycled aggregates and aggregates from secondary sources. Some of the most commonly used tests in the aggregate production are Particle size distribution, Resistance to fragmentation and Water absorption/Density. The grading is the most commonly verified property in product and production control. Resistance to fragmentation is often used as a general quality parameter in addition to evaluation of the suitability for road construction. Finally, the water absorption is used to assess frost resistance, to prepare concrete mix designs, to determine the long-term density of weight compensating layers etc. It has clearly been demonstrated that all of these methods need to be modified or replaced in order to verify the properties of alternative materials.
机译:由于天然骨料资源的短缺,迫切需要朝着更可持续的生产和消费方向转变。解决方案之一是利用替代骨料。在许多情况下,替代骨料适合用于土木工程。为了常规使用它们,我们需要相关的标准化测试方法来评估其适用性。本文介绍了3个北欧共同研究项目的主要结果,这些研究项目评估标准骨料测试方法是否也适用于回收骨料和二次来源骨料。骨料生产中最常用的一些测试是粒度分布,抗碎裂性和吸水率/密度。分级是产品和生产控制中最常验证的属性。除评估道路施工的适用性外,抗碎裂性通常还用作一般质量参数。最后,吸水率可用于评估抗冻性,准备混凝土配合料设计,确定重量补偿层的长期密度等。已经清楚地证明,所有这些方法都需要修改或替换,以便验证替代材料的特性。

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