The origin of the well-known ‘grain size gap’ within range 1–10 mm in fluvial gravels is explored a laboratory experiment to ascertain effect hydraulic sorting. A widely graded sand/gravel mixture was fed into flume containing bed composed same sediment mixture. rate feed varied but water flow remained constant throughout at that sustained size-selective bedload transport with negligible suspen...

This paper addresses the issue of polishing electroplating wastewater in subsurface vertical flow constructed wetland. Electroplating wastewater treatment or polishing in constructed wetlands (CWs) was studied to a very limited degree. Four types of microcosm upflow constructed wetlands were selected for the experiment based on type of bed media and the presence or absence of vegetation (Phragm...

A laboratory study was made of the effects of crushed particles, both coarse and fine aggregate, on the stability of bituminous-aggregate mixtures. Crushed limestone and varying percentages of crushed and uncrushed gravel were used as the coarse aggregate while variation in the shape of the fine aggregate was obtained by using rounded natural sand and crushed-stone sand. These aggregates were u...

This paper presents a novel velocity estimation method for all terrain ground vehicles. The technique is based on a camera that scans the ground and estimates the velocity by using an optical flow algorithm. The method is tested and validated for different types of terrains such as fine sand, coarse sand, gravel as well as a mixture of coarse sand and gravel. Measured velocities from precise en...

Thermal resistance of the structural layers a road is one important parameters that determine choice technical solutions design in permafrost area. The purpose this research quantitative assessment influence extent to which pores gravel bedding are filled with ice or sand on thermal conductivity an ice-gravel sand-gravel mixture. Lichtenecker formula was used calculate coefficient three-compone...

Granulometric, mineralogical and morphological investigation of the sea-bottom sediments in the Grgur Channel has revealed fi ve sediment types, the most frequent of which are muds containing some amount of coarse fractions (sand and gravel). The coarsest fractions are predominantly composed of recent shell fragments. Unexpected well rounded carbonate gravel was found SE of Prvić Island in 83 m...

Most of the public roads that are being built and reconstructed in Uzbekistan today involve using a cement-treated or reinforced crushed stone-gravel-sand mixture for upper base layer.In process quality control construction work, several difficulties arise with assessing this material's strength.The article deals issue determining model predicting tensile strength during bending treated cement ...