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Mix design and properties of fly ash waste lightweight aggregates in structural lightweight concrete

机译：粉煤灰废轻骨料在结构轻质混凝土中的混合设计和性能

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摘要

Concrete is one of the most widely used construction materials and has the ability to consume industrial wastes in high volume. As the demand for concrete is increasing, one of the effective ways to reduce the undesirable environmental impact of the concrete is by the use of waste and by-product materials as cement and aggregate substitutes in concrete. One such waste material is fly ash, which is produced in large quantities from thermal power plants as a by-product. A substantial amount of fly ash is left unused posing environmental and storage problems. The production of sintered lightweight aggregate with fly ash is an effective method to dispose of fly ash in large quantities. Due to lack of a proper mix design procedure, the production and application of lightweight aggregate in structural concrete are not much entertained. The absorption characteristic of lightweight aggregate is a major concern, while developing the mix proportioning of lightweight concretes. The present study is an attempt to establish a new mix design procedure for the development of sintered fly ash lightweight aggregate concretes, which is simple and more reliable than the existing procedures. Also, the proposed methodology has been validated by developing a spectrum of concretes having water cement ratios varying from 0.25 to 0.75. From the study, it is obvious that the development of 70MPa concrete is possible by using cement alone without any additives. Also, it is ensured that all the concretes have densities less than 2000kg/m3.
机译：混凝土是使用最广泛的建筑材料之一，具有大量消耗工业废物的能力。随着对混凝土需求的增加，减少混凝土的不良环境影响的有效方法之一是使用废物和副产品材料作为混凝土中的水泥和集料替代品。一种这样的废料是粉煤灰，其作为副产物从火力发电厂大量生产。大量的粉煤灰被闲置，造成环境和储存问题。用粉煤灰生产烧结轻质骨料是一种有效处理大量粉煤灰的有效方法。由于缺乏适当的配合料设计程序，因此在结构混凝土中轻质骨料的生产和应用受到很大的困扰。在开发轻质混凝土的配合比时，轻质骨料的吸收特性是一个主要问题。本研究试图为开发粉煤灰轻质骨料烧结混凝土的开发建立新的配合比设计程序，该程序比现有程序更简单，更可靠。同样，通过开发一系列水胶比从0.25到0.75的混凝土，所提出的方法得到了验证。从研究中可以明显看出，仅使用不含任何添加剂的水泥就可以开发70MPa混凝土。另外，要确保所有混凝土的密度都小于2000kg / m3。

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