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http://dx.doi.org/10.7843/kgs.2019.35.10.33

A Study on Strength and Durability Characteristics of Cemented Weathered Mudstone  

Kim, Seong-Heon (Dept. of Civil Eng., Kyungpook National Univ.)
Moon, Hong-Duk (Dept. of Civil Eng., Gyeongnam National Univ. of Science and Technology)
Park, Sung-Sik (Dept. of Civil Eng., Kyungpook National Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.35, no.10, 2019 , pp. 33-45 More about this Journal
Abstract
In this study, in order to recycle a large amount of rocks and weathered mudstones produced by civil engineering projects such as railways and highways, as materials for roadbeds or embankment materials, circumferential specimens with a diameter of 5 cm and a height of 10 cm were made. A mudstone that weathered rapidly during rainfall was collected from Pohang construction sites. The weathered mudstone passed through a 2 mm sieve. It was prepared with the cement ratio, the sand ratio, curing condition and curing days. Three specimens were prepared according to each condition and then the unconfined compressive test, durability test and SEM analysis were performed to evaluate the engineering properties of the cemented soil. In the case of 28 days cured specimen, the strength of under-water cured specimens was 32-55% and the durability index was about 15% higher than air cured specimens. In addition, when the CR increased from 8% to 16%, the unconfined compressive strength (UCS) of pure mudstone cemented soil under water increased by about 1.6 times and the durability index increased by about 1.9 times. When the SR increased from 0% to 50%, the UCS of the specimen with SR = 10% was slightly less than or equal to specimen with SR = 0%. Then, as the SR became 30-50%, the UCS increased up to 51%. Unlike the UCS, the durability index increased continuously as the SR increased. As a result of SEM analysis, when SR was 50% rather than SR = 0%, the contact between sand particles increased and they were connected to each other. Such contact between these particles resulted in the increase of strength.
Keywords
Mudstone; Curing condition; Cement ratio; Sand ratio; Strength; Durability;
Citations & Related Records
Times Cited By KSCI : 6  (Citation Analysis)
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