利用花岗岩和石灰石废料作为混凝土骨料

Aya Abdel Hakeem, E. Souaya, Ali I. M. Ismail
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摘要

本文对花岗石和石灰石废料在混凝土中替代不同粒度的集料进行了可行性研究。将花岗岩和石灰石废料成不同粒度的球团,在室温下露天干燥48小时,除去多余的水分,提高和易性。随后,球团在回转窑中以非常高的温度,以每分钟20°C的加热速度,在1100°C下加热2小时。利用岩石学、x射线荧光(XRF)、x射线衍射(XRD)、扫描电子显微镜(SEM)和能量色散x射线光谱学(EDX)等技术分析废物的化学和矿物组成。这些分析表明,第一种材料是含铁量高(6.66%)的花岗岩,称为“含铁花岗岩”,第二种材料是含铁量正常(3.15%)的花岗岩,称为“普通花岗岩”,第三种材料是“石灰石”,有助于选择适合混凝土生产的材料。总之,本研究旨在研究花岗岩和石灰石废料在混凝土生产中作为传统骨料替代品的潜在用途。通过一系列的成型、燃烧和混合过程。得到的重要结果是,随着花岗岩废料比例的增加,颗粒变得更易碎。因此,基于本研究,我们建议将花岗岩和石灰石混合以提高骨料的耐久性,使其能够用于生产高强度混凝土。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Utilization of Granite and Limestone Wastes as Aggregates in Concrete
he feasibility study of utilizing granite and limestone waste materials as alternatives to aggregates in various grain sizes in concrete is carried out in this work. The granite and limestone wastes are pelletized into different grain sizes and then dried for 48 hours in open air at room temperature to remove the excess water and enhance workability. Subsequently, the pellets are fired in a rotary kiln at a very high temperature, with a heating rate of 20°C per minute, for 2 hours at 1100°C. The chemical and mineralogical composition of the waste materials is analyzed using techniques such as petrography, X-ray fluorescence (XRF), X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX). These analyses show the composition and structure of the first material which is granite with a high iron content (6.66%) is called “Ferriferous granite”, the second material is granite with normal iron content (3.15%) is called “Normal granite” and the third material is “Limestone”, and aid in the selection of suitable materials for concrete production. In conclusion, this research aims to investigate the potential use of granite and limestone waste materials as replacements for traditional aggregates in concrete production. Through a series of shaping, burning, and mixing processes. The important results obtained is that as the percentage of granite waste increases, the pellets become more friable. Therefore, based on this research, we recommend mixing the granite and limestone to enhance the durability of the aggregates, enabling their utilization in the production of high-strength concrete.
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