Geotechnical characteristics of volcanic soil from seismically induced Aratozawa landslide, Japan

The research aimed to make Volcanic soil of Multiple Soil Layering (MSL) with different Hydraulic Loading Rate (HLR) on the purification of polluted irrigation water and to determine the appropriate HLR against purification of polluted irrigation water. The research used an MSL system of the same Soil Mixture Block (SMB) size from a study done by (Chen et al., 2007) arranged in an Acrylic box measuring 50 cm x 10 cm x 60 cm (PxLxT). Making SMB is done by mixing volcanic soil, sawdust, iron, charcoal that has been mashed by 50 mesh sieve, with a combination of 7: 1: 1: 1. The MSL system is supplied with irrigation water taken from the Gunuang Nago irrigation and Pasar Baru area, Cupak Tangah village, Pauh IX sub-district, Padang continuously with different HLR of 250 L/m2/day, 500 L/m2/ day and 1000 L/m2/day. From the result of this research, it is found that MSL system can decrease pollutant content in polluted irrigation water until the concentration below the water quality standard based on PP. 82 of 2001 and MSL system with HLR 250 L/m2/day have high ability in purifying BOD and COD and HLR 1000 L/m2/day has a high ability in purifying NH4+, NO2- and NO3- on polluted irrigation water. Tujuan penelitian ini adalah untuk menentukan pengaruh tanah vulkanik dalam sistem Multiple Soil Layering (MSL) dengan Hydraulic Loading Rate (HLR) yang berbeda terhadap pemurnian air irigasi terpolusi. Penelitian menggunakan sistem MSL dengan ukuran Soil Mixture Block (SMB) yang sama dari penelitian yang telah dilakukan (Chen, Sato, Wakatsuki, & Masunaga, 2007)yang disusun di dalam kotak Acrylic berukuran 50 cm x 10 cm x 60 cm (PxLxT). Soil Mixture Block terdiri dari tanah vulkanik, serbuk gergaji, besi, arang yang telah dihaluskan oleh ayakan 50 mesh, dengan perbandingan kombinasi 7:1:1:1. Sistem MSL dialirkan air irigasi yang diambil dari irigasi Gunuang Nago dan Kawasan Pasar Baru, Kelurahan Cupak Tangah, Kecamatan Pauh IX, Padang secara terus menerus dengan HLR yang berbeda yaitu 250 L/m2/hari, 500 L/m2/hari dan 1000 L/m2/hari. Dari hasil penelitian diperoleh bahwa sistem MSL mampu menurunkan kandungan zat pencemar pada air irigasi terpolusi mencapai kosentrasi di bawah baku mutu air berdasarkan PP No. 82 tahun 2001 dengan HLR 250 L/m2/hari mempunyai kemampuan yang tinggi dalam memurnikan kadar pencemar BOD dan COD sedangkan HLR 1000 L/m2/hari mempunyai kemampuan yang tinggi dalam memurnikan kadar pencemar NH4+, NO2- dan NO3- pada air irigasi terpolusi.

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Volcanic Soil Series of the Lesser Caucasus as an Archive of Early Pleistocene Paleoecological Information

Paleontological Journal ◽

10.1134/s0031030120080092 ◽

2020 ◽

Vol 54 (8) ◽

pp. 872-881

Author(s):

N. O. Kovaleva ◽

E. M. Stolpnikova

Keyword(s):

Early Pleistocene ◽

Volcanic Soil ◽

Soil Series ◽

Lesser Caucasus

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Petrographic and Geotechnical Characteristics of Carbonate Aggregates from Poland and Their Correlation with the Design of Road Surface Structures

Materials ◽

10.3390/ma14082034 ◽

2021 ◽

Vol 14 (8) ◽

pp. 2034

Author(s):

Jerzy Trzciński ◽

Emilia Wójcik ◽

Mateusz Marszałek ◽

Paweł Łukaszewski ◽

Marek Krajewski ◽

...

Keyword(s):

Road Surface ◽

Surface Structures ◽

Engineering Properties ◽

Geological Engineering ◽

Functional Relationships ◽

Road Design ◽

Geotechnical Characteristics ◽

Design Calculations ◽

Building Engineering ◽

Design And Construction

The paper presents the basic problem related with practical application of carbonate rocks in construction: are carbonate aggregates produced from such rocks favorable for building engineering, particularly for road design and construction? To resolve this problem, (1) the geological-engineering properties of aggregates are presented, (2) the correlation between petrographic and engineering parameters is shown, and (3) a strict correlation between the geological-engineering properties and the freezing-thawing and crushing resistance is recognized. This knowledge has allowed to assess the usefulness of asphalt concrete (AC) made from dolomite and limestone aggregates in the design and construction of road surface structures. The petrography was characterized using optical microscopy and scanning electron microscopy (SEM) coupled with energy-dispersive X-ray spectroscope (EDS). Engineering properties were determined in accordance with European and Polish norms and guidelines. Statistical and design calculations were performed using dedicated software. The petrographic properties, and selected physical and mechanical parameters of the aggregates, were tested to show their influence on the freezing–thawing and crushing resistance. Strong functional relationships between the water adsorption, and the freezing–thawing and crushing resistance have been observed. Aggregate strength decreased after saturation with increasing concentrations of salt solutions. Calculations of AC fatigue durability and deformation allow for reducing the thickness of the road surface structure by about 20% in comparison to normative solutions. This conclusion has impact on the economy of road design and construction, and allows for a rational utilization of rock resources, which contributes to sustainable development of the construction industry.

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