This research was conducted to evaluate abrasion resistance of high-volume fly ash concrete. A reference plain portland cement concrete was proportioned to obtain 28day strength of 41 MPa. Concrete mixtures were also proportioned to have two levels of cement replacements (50 and 70%) with an ASTM Class C fly ash. Abrasion tests were carried out using the rotating cutter method as per ASTM C-944...

inspecting the behavior of the rockfill materials is of significant importance in analysis of rockfill dams. since the dimensions of grains in such materials are greater than the conventional sizes suitable for soil mechanics tests, it is necessary to experimentally study them in specific large-scale apparatuses. in this research, the behavior of rockfill materials in two large rockfill dams co...

Grinding chatter is a kind of self-excited vibration in which the grinding system continuously absorbs energy from machine, increasing mechanical system. can damage surface workpiece and accelerate abrasion wheel. The theoretical analysis for beam was launched based on behavior single abrasive grain, whose cutting thickness key factor affecting stability. dynamic force model has been developed,...

The tribological behavior of Ni-based WC-Co coatings is analyzed. were deposited on gray cast iron substrates in a spray and fuse process using SuperJet Eutalloy deposition equipment, varying the oxygen flow conditions flame. crystallographic structure was characterized via X-ray diffraction (XRD) technique. microhardness measured surface cross sections by means Knoop tester. topography morphol...

This paper describes an in-depth evaluation of an abrasion testing procedure for concrete pavers developed in Australia The test involves abrasion of the paver surface by a rapidly rotating ball race under load. Water is used both to lubricate the race and to remove debris. The investigation included the study of factors affecting the test results such as the load applied to the ball-race, the ...

The opinions, findings, and conclusions expressed in this publication are those of the principal investigators and the Missouri Department of Transportation. They are not necessarily those of the U.S. Department of Transportation, Federal Highway Administration. This report does not constitute a standard or regulation. ii ABSTRACT The main objective of this study was to determine the effect on ...

  Vitiligo is a common idiopathic acquired cutaneous pigmentary disorder resulting in depigmented skin. A wide variety of therapeutic modalities have been employed for its treatment, but none of them are satisfactory, in this study we have tested the effect of 5- fluorouracil 5FU on 54 patients with documented vitiligo in Kerman city. The following treatments were performed on three selected v...