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首页> 外文会议>RILEM Proceedings PRO 40; International RILEM Conference on the Use of Recycled Materials in Buildings and Structures vol.2; 20041108-11; Barcelona(ES) >ASSESSMENT OF THE POZZOLANIC REACTION OF CRYSTALLINE AND AMORPHOUS RICE HUSK-ASHES (RHA)
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ASSESSMENT OF THE POZZOLANIC REACTION OF CRYSTALLINE AND AMORPHOUS RICE HUSK-ASHES (RHA)

机译：结晶态和非晶态稻壳灰（RHA）的火山灰反应评估

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摘要

The incorporation of industrial residue to cement as mineral admixtures is one of the solutions for making use of byproducts from other industrial sectors in nobler purposes such as the partial substitution in cement, thus enriching the properties of the final product, in addition to disposing of the residue adequately. Rice husk-ash (RHA) is one of the mineral admixtures that has been relatively well studied in recent years, although it has not been commercially used by the civil engineering industry. Depending on how the husk is burnt, RHA can be classified in two groups: (1) Crystalline RHA - produced without control over the burning process; and (2) Amorphous RHA - produced with controlled burning. The basic difference between crystalline RHA and amorphous RHA is the content of amorphous material found in the ashes. According to several authors, the greater the content of amorphous material, the greater the reactivity of the RHA. Another important factor in RHA reactivity is to what degree it has been ground. In terms of physical characteristics, those of greater importance are related to fineness, in all its manifestations and expressions, since different grading fractions behave differently. The aim of this paper is to investigate the influence of the index of amorphousness and the degree of fineness on the pozzolanic activity of RHAs, thus contributing to a better understanding of the pozzolanic reaction under study. By using major tests to evaluate pozzolanic activity, the significant influence of the degree of fineness on RHA pozzolanic activity was verified. The index of amorphousness seems to have smaller influence as can be verified by the high reactivity of crystalline RHA when it is finely ground.
机译：将工业残余物掺入水泥中作为矿物掺合料是利用其他工业部门副产品用于更贵的目的（例如水泥中的部分替代）的一种解决方案，从而除了处理废料外还丰富了最终产品的性能。残留物充足。稻壳灰（RHA）是近年来经过相对充分研究的一种矿物掺合料，尽管土木工程行业尚未将其商业化使用。根据外壳的燃烧方式，RHA可分为两类：（1）结晶性RHA-在无法控制燃烧过程的情况下生产； （2）非晶态RHA-受控燃烧产生。结晶RHA和无定形RHA之间的基本区别是灰烬中无定形物质的含量。根据几位作者，无定形材料的含量越高，RHA的反应性就越高。 RHA反应性的另一个重要因素是研磨到何种程度。就物理特性而言，更重要的特性在所有表现形式和表达方式上都与细度有关，因为不同的分级分数表现不同。本文的目的是研究无定形指数和细度对RHAs的火山灰活性的影响，从而有助于更好地了解所研究的火山灰反应。通过使用主要测试评估火山灰活性，验证了细度对RHA火山灰活性的重大影响。无定形指数似乎具有较小的影响，可以通过将结晶RHA细磨时的高反应活性来证明。

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