Atsushi Kasahara

DEVELOPMENT OF ASSET MANAGEMENT SYSTEMS BASED ON CONCEPT OF PAVEMENT MANAGEMENT SYSTEMS

Asset management system has always been an important technical area in the world. The asset management isconcerned with the entire life cycle of transportation decisions including planning, programing, construction, maintenance, and operations. National government and local government would like to develop asset managementsystems in Japan. The application of concept of pavement management system will make it possible for many assetmanagers to do a better job of managing their assets. The developing process of pavement management system in USA will be useful to establish the asset management system in Japan. Performance, historic, policy, geometry, environmental and cost related data are indispensable for pavement and asset management system.

STUDY ON DEFORMATION OF INTERLOCKING BLOCK PAVEMENT

本研究では, インターロッキング (IL) ブロック舗装におけるブロック間の荷重伝達率にブロック寸法・目地材料・路面の締固め方法等が与える影響, および路盤構造の強弱とILブロック舗装の荷重分散性能の関係を明らかにすることを目的として, 小型のFWDであるHFWDを用いて供用中の車道舗装や試験舗装にてたわみ測定を行った. その結果, ブロック寸法と荷重伝達率には高い相関のあることが確認でき交通量に応じたブロック寸法を提案することができた. さらに, 目地砂の機能を明らかにし, 供用中の車道舗装において, 路盤構造の差異が荷重分散性能に与える影響, ILブロック舗装の破損部と健全部におけるたわみ特性の差異を明らかにした.

MEASURMENT OF SAIDEWALK EVENNESS BY A HANDY PROFILER USING SEQUENTIAL TWO ANGLES METHOD

DEKO-BOKO Walk was developed to measure sidewalk profile. It employs the Sequential Two Angles Method that measures the angle of the two connection shafts that connect three wheels located every 25 cm in the running direction.In this study, we developed a method for calculating profiles from the data measured by the DEKO-BOKO Walk, and examined the Root Mean Square Error between true profile and calculated profile. It was found that faulting and slope of the pavement could be obtained from the profile calculated by this method. We also showed that it was possible to obtain an accurate profile from the data measured on bumpy sidewalks including entrance to driveway.

THE ANALISYS OF RUTTING OF THE LTPP PROGRAM IN THE UNITED STATES

Since 1987, theLTPP (Long Term PavementPerformance ) program had been implemented in theUSaspartofthe SHRP (Strategic Highway Research Program ). After the termination of the SHRP in 1992, the FHWA (Federal Highway Administration) continued the research and collection of data on the LTPP program, as this program isa 20-year-term plan. This report focuses on the rutting of asphalt pavement, as recorded on the DATA PAVE97compiling achievements obtained by the FHWA during this program - and presents results of study regarding the real status of rutting and relevant factors.