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This project focused on the evaluation of the feasibility of using crushed portland cement concrete (CPCC) materials in TxDOT applications. Special interest was given to the use of CPCC fines passing the No.4 sieve. The research approach for exploring potential applications was divided into two ways as follows: . paving applications: flexible base, cement treated base, and HMA bond breaker; and . non-paving applications: portland cement concrete, flowable fill, backfill, and embankment. Much of the research effort was devoted to a laboratory test program for material characterization. The test program identified aggregate properties, mix design properties, basic mechanistic properties, workability, and moisture susceptibility of the applied mixtures containing crushed concrete materials. Although the use of crushed concrete materials generally resulted in increased water demand and decreased workability, test results indicated that crushed concrete materials are highly feasible to use in the selected applications. However, CPCC fines were determined not to be suitable for the reproduction of portland cement concrete because the loss of workability was so severe in this application. Based on the results of the test program, recommendations and revised specifications, which allow for the use of CPCC fines, are provided for the selected applications: flexible base, cement treated base, HMA bond breaker, flowable fill, backfill, and roadway embankment.
Pavement Design And Paving Material Selection are important for efficient, cost effective, durable, and safe transportation infrastructure Paving Materials and Pavement Analysis contains 73 papers examining bound and unbound material characterization, modeling, and performance of highway and airfield pavements. The papers in this publication were presented during the GeoShanghal 2010 International Conference held in Shanghai, China, June 3-5, 2010.
RCM compares well with typical pavement base materials in many respects. Given the laboratory and field data developed in this research, engineers should be able to estimate the strength and durability parameters of RCM needed for pavement design.
This book (including a 969 pages full paper USB device) deals with the geotechnics of roads, railways and airfields. Providing economic and sustainable transportation infrastructures for societies is highly dependent on progress made in this field, and the contributions are of interest to professionals and academics involved in geotechnical and pavement engineering of roads, railways and airfields.
'Pavers?, ?Precast concrete?, ?Prefabricated parts?, ?Concretes?, ?Roads?, ?Blocks (building)?, ?Footpaths?, ?Pedestrian roads?, ?Paved areas?, ?Hard standings?, ?Parking areas?, ?Exterior circulation spaces (buildings)?, ?Dimensions?, ?Thickness?, ?Strength of materials?, ?Performance?, ?Dimensional measurement?, ?Wear tests?, ?Flatness measurement?, ?Mechanical testing?, ?Thermal-cycling tests?, ?Freezing tests?, ?Performance testing?, ?Water-absorption tests?
The book presents original technologies developed by the authors and existing Russian experience in study and application of technogenic raw materials (such as burnt rocks of mine dumps and ash-slag waste) to R&D of road constructions with high-strength properties and long-life operation. Another direction of the book is connected with finite-element modeling pavement constructions on different soils. To this aim, corresponding theoretical solutions and numerical algorithms are realized in ANSYS software. The obtained numerical results are compared with existing experimental data for real road constituents. It presents particular results of the Russian schools of Mechanics and Material Sciences not previously available outside of Russia. Explains original theoretical and experimental methods developed for solution of the problems of effective using technogenic waste in building and road constructions; Facilitates improvement and optimization of theoretical and numerical approaches for R&D of road pavements on different soils; Describes new promising building materials based on easily accessible waste able effectively to replace conventional materials and supported by Russian patents.
The purpose of this manual is to provide clear and helpful information for maintaining gravel roads. Very little technical help is available to small agencies that are responsible for managing these roads. Gravel road maintenance has traditionally been "more of an art than a science" and very few formal standards exist. This manual contains guidelines to help answer the questions that arise concerning gravel road maintenance such as: What is enough surface crown? What is too much? What causes corrugation? The information is as nontechnical as possible without sacrificing clear guidelines and instructions on how to do the job right.