Open AccessQuality of siltstones for concrete aggregate from Nallu Khola area, Kathmandu valley
Author(s) -
Dev Maharjan,
Naresh Kazi Tamrakar
Publication year - 2004
Publication title -
journal of nepal geological society
Language(s) - English
Resource type - Journals
ISSN - 2676-1378
DOI - 10.3126/jngs.v30i0.31708
Subject(s) - aggregate (composite) , schmidt hammer , hammer , siltstone , petrography , geotechnical engineering , geology , mineralogy , index (typography) , composite material , materials science , metallurgy , geomorphology , compressive strength , facies , structural basin , world wide web , computer science
The siltstones of the Tistung Formation are the major source of concrete aggregate in the Kathmandu valley. A member of quarries are operating in the valley, especially in the vicinity of the Nallu Khola, for more than three decades. Randomly collected siltstone samples from both banks of the Nallu Khola were studied to reveal their petrography and chemical composition. Crushed rock fragments were investigated to determine their overall aggregate properties. Tests were carried out to determine shape, flakiness index, elongation index, degree of induration, Schmidt hammer value, dry density, water absorption value, aggregate crushing value, and aggregate impact value. The test results indicate that the aggregates are physically, mechanically, and chemically sound.