Introduction State and local transportation agencies frequently use opengraded aggregates for wall, roadway, and bridge construction. The primary advantages of using this type of material in wall and abutment applications are ease of constructability, lighter in-place density than well-graded materials, very low fine content, free-draining characteristics, and simpler quality assurance testing,...

Specially designed ductile end diaphragms of steel bridge superstructures have previously proved, both theoretically and experimentally, to dissipate seismic input energy, protecting other substructure and superstructure members. Although ductile diaphragms have been introduced in the latest AASHTO guide specifications as a structural system that can be used to resist transverse earthquake effe...

This paper summarizes the recent work by the first author’s research group related to vehicle effects on existing bridges, using reliability based performance assessment. The first part presents a simulation framework of fatigue reliability assessment for existing bridges considering the effects of vehicle speed, road roughness condition, equivalent stress range and the constant amplitude fatig...

Aggregates are a significant feature of asphalt mixtures, which significantly affect the volumetric properties and mechanical performance. Layers concrete consist mixture fine aggregates, coarse fillers mixed with penetration grade asphalt. The pavement layer (asphalt concrete) has several types: wear surface layer, intermediate foundation layer. experimental research method gradation testing u...

In recent years, mechanistic-empirical (M-E) design methods are preferred in the of flexible pavements instead empirical using equations based on road performance tests. However, calibration transfer that convert mechanical responses to pavement life and definition layer materials used M-E have great importance for methods. this study, analyzes a cross-section designed with AASHTO-93 method wer...

This paper present the investigation of possible causes incessant road failure associated with subgrade soils Niger delta using mineralogical and geotechnical properties assessment. Geotechnical revealed clayey sand form bulk composed generally fine to medium grains low intermediate plasticity. Based on AASHTO soil classifies as A-2 A-6 granular being dominant. The average values obtained for C...

This study investigated the use of self-compacting concrete (SCC) made with recycled coarse aggregates (RCAs), which represents a trend producing environment-friendly concrete, integrated hot-rolled steel sections by means headed stud shear connectors in composite structures. Therefore, thirty-six push-out test specimens were examined to assess strength and behavior embedded RCA-SCC, compressiv...

The Simpang Pudak road section is a district that connects Muaro Jambi with City. This link to the economic, social and cultural sectors of Regency City, so there are also factory vehicles crossing section, dominated by small large trucks transporting economic products other agricultural products. condition Road flexible pavement has destroyed its surface foundation layer below it. he purpose t...

Bridge structures are vital for majority of Sudanese due to the fact that they live besides rivers, valleys and inside islands. construction is faced by it extremely expensive. Cost such affected load which accordingly dictates required dead Loads from both superstructure substructure. In this analytical study a light bridge derived making use AASHTO principles. This practical data collected se...