Screen-Out Stones Activated with Mineral Binders and Used as Material for Earth Construction

IF 0.6 4区 工程技术 Q4 ENGINEERING, CIVIL
Joanna Hydzik-Wiśniewska, Łukasz Ostrowski, Anna Wilk, Adrian Krajewski
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Abstract

The article presents the e valuation o f h ow suitable waste from the production of aggregates in quarries could be in earthwork using the example of screen-outs from Krosno sandstone. The waste, called screen-out, is characterised by an uncontrolled content of dust and clay fractions. Screen-outs have a relatively low bearing ratio (CBR not exceeding 20%) and a tendency to heave due to frost (SE <35). To check whether the geotechnical properties can be improved, mixtures with 2%, 5%, and 8% binders, such as lime, fly ash, and two road binders with lime, fly ash, and cement were prepared. The analysis was based on the results of the CBR and compressive strength tests. The use of mineral binders caused the value of the immediate CBR to increase compared to the screen-out itself from a dozen to as much as 50%. For a binder containing 20% Portland clinker, the CBR was about 60% after 4 days of saturation, while for a binder containing up to 50% Portland clinker, it was over 200%. The value of compressive strength after 28 days of maturing ranged from about 100 kPa to 1 MPa for all mixes tested. The lowest values were obtained for screen-outs activated with fly ash, and the highest for road binder with cement content of up to 50%.
用矿物粘合剂活化的筛出石,用作土建材料
本文以克罗斯诺砂岩的筛出为例,对采石场生产集料产生的废物在土方工程中的适用程度进行了评估。这种废物被称为筛出废物,其特点是粉尘和粘土的含量不受控制。筛网具有相对较低的承载比(CBR不超过20%)和由于霜冻而产生的隆起趋势(SE <35)。为了检查是否可以改善土工性能,配制了含有2%,5%和8%粘结剂(如石灰,粉煤灰)的混合物,以及含有石灰,粉煤灰和水泥的两种道路粘结剂。该分析是基于CBR和抗压强度试验的结果。矿物粘合剂的使用使直接CBR的价值比筛出本身的价值从12%增加到高达50%。对于含有20%硅酸盐熟料的粘结剂,饱和4天后CBR约为60%,而对于含有高达50%硅酸盐熟料的粘结剂,饱和4天后CBR超过200%。所有试验混合料成熟28天后的抗压强度值在100 kPa ~ 1 MPa之间。粉煤灰活化筛出物的数值最低,水泥掺量达到50%的道路粘结剂的数值最高。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Baltic Journal of Road and Bridge Engineering
Baltic Journal of Road and Bridge Engineering 工程技术-工程:土木
CiteScore
2.10
自引率
9.10%
发文量
25
审稿时长
>12 weeks
期刊介绍: THE JOURNAL IS DESIGNED FOR PUBLISHING PAPERS CONCERNING THE FOLLOWING AREAS OF RESEARCH: road and bridge research and design, road construction materials and technologies, bridge construction materials and technologies, road and bridge repair, road and bridge maintenance, traffic safety, road and bridge information technologies, environmental issues, road climatology, low-volume roads, normative documentation, quality management and assurance, road infrastructure and its assessment, asset management, road and bridge construction financing, specialist pre-service and in-service training;
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