Download or read book An Introduction to Pavement Subgrade Improvement and Strengthening written by J. Paul Guyer, P.E., R.A. and published by Guyer Partners. This book was released on 2020-10-18 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introductory technical guidance for civil and geotechnical engineers and construction managers interested in strengthening and improvement of subgrades for street and highway pavements. Here is what is discussed: 1. INTRODUCTION 2. CHARACTERISTICS OF STABILIZED SOILS 3. THICK GRANULAR LAYERS 4. GEOTEXTILES AND GEOGRIDS 5. ADMIXTURE STABILIZATION 6. SOIL ENCAPSULATION 7. LIGHTWEIGHT FILL 8. RECYCLE.
Download or read book An Introduction to Pavement Subgrade Improvement and Strengthening written by J Paul Guyer and published by . This book was released on 2020-10-18 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introductory technical guidance for civil and geotechnical engineers and construction managers interested in strengthening and improvement of subgrades for street and highway pavements. Here is what is discussed:1. INTRODUCTION2. CHARACTERISTICS OF STABILIZED SOILS3. THICK GRANULAR LAYERS4. GEOTEXTILES AND GEOGRIDS5. ADMIXTURE STABILIZATION6. SOIL ENCAPSULATION7. LIGHTWEIGHT FILL8. RECYCLE.
Download or read book Stabilization of Existing Subgrades to Improve Constructibility During Interstate Pavement Reconstruction written by Joakim G. Laguros and published by . This book was released on 1997 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: This synthesis will be of interest to state department of transportation (DOT) construction, geotechnical, materials, and pavement system design engineers, engineering geologists, and research engineers, and others concerned with the constructibility of new pavements over existing subgrades. The synthesis describes current practice for the stabilization of existing subgrades to improve constructibility during interstate pavement reconstruction. It presents information regarding the methods available to evaluate and improve subgrade conditions for the purpose of meeting the constructibility requirements of a reconstruction project. This report of the Transportation Research Board presents data obtained from a review of the literature and a survey of the state DOTs. The synthesis reports on: subgrade evaluation methods including sampling, laboratory, and in-situ test methods, as well as assessment of existing drainage systems; constructibility factors such as existing and proposed pavement types, available equipment, and cost effectiveness of various subgrade stabilization techniques; methods of subgrade improvement including mechanical and chemical stabilization, use of recycled and waste materials, the use of geosynthetics in reinforcement and drainage applications; and construction methods with an emphasis on innovative approaches such as novel sequencing of construction traffic, use of lightweight equipment, and robotics. In addition, several case histories describing applicable pavement reconstruction projects are presented. Finally, suggestions to possibly improve the practice and the identification of research needs are also presented.
Download or read book Handbook for Stabilization of Pavement Subgrades and Base Courses with Lime written by Dallas N. Little and published by . This book was released on 1995 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Introduction to Pavement Engineering Volume 1 written by J. Paul Guyer, P.E., R.A. and published by Guyer Partners. This book was released on 2019-09-26 with total page 347 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introductory technical guidance for civil engineers, construction managers and highway maintenance managers interested in pavement engineering. This is one of two volumes. This is what is contained in this volume: 1. AGGREGATE SURFACE PAVEMENTS 2. THIN ASPHALT PAVEMENT OVERLAYS 3. CONCRETE ADMIXTURES FOR PAVEMENT 4. ACOUSTIC SPECTROSCOPY FOR ASR TESTING OF CONCRETE PAVEMENT 5. BASES AND SUBBASES FOR CONCRETE PAVEMENT 6. INTERNAL CURING OF CONCRETE PAVEMENT 7. PAVEMENT FOR SEASONAL FROST CONDITIONS 8. PAVEMENT DRAINAGE 9. FLEXIBLE ASPHALT CONCRETE 10. ELASTIC LAYERED METHODS OF FLEXIBLE PAVEMENT DESIGN 11. COMPACTION AND QUALITY CONTROL FOR HOT MIX ASPHALT PAVEMENT 12. SURFACE PREPARATION AND PLACEMENT FOR HOT MIX ASPHALT PAVEMENT 13. PAVEMENT SURVEY, MAINTENANCE AND REPAIR 14. PAVEMENT OVERLAYS.
Download or read book Geotechnical Aspects of Pavement Engineering written by Nishantha Bandara and published by Momentum Press. This book was released on 2018-02-25 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: Familiarity with geotechnical aspects of pavement engineering is essential for the practicing pavement engineer. When designing pavements, accurate characterization of the existing subgrade condition becomes a crucial task. In the past, traditional geotechnical exploration and testing methods have been used to characterize existing subgrade conditions. However, with the introduction of the Mechanistic-Empirical (ME) pavement design, there is a need for improved and more appropriate methods of subgrade characterization, for prediction of future pavement conditions with better accuracy. Hence, this handbook will present a useful tool for practicing pavement engineers.
Download or read book Influence of Subgrade Improvement and Non uniformity on Pavement Performance written by Tyson David Rupnow and published by . This book was released on 2004 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis contains results from three projects describing self-cementing fly ash stabilization of RAP-soil mixtures, stabilization of limestone screenings for use as a structural layer in road construction, and finite element modeling results of various subgrade materials including self-cementing fly ash stabilized subgrade, natural subgrade, granular subbase, and hydrated fly ash. The first project shows that self-cementing fly ash stabilization of RAP-soil mixtures is economically feasible and structurally capable of supporting construction traffic. The increase stiffness from the addition of self-cementing fly ash increases capacity ensuring long term pavement performance. Addition of self-cementing fly ash increases the consolidated shear strength about five times. The second project shows construction operations and field results proving that stabilization of limestone screenings is viable, cost effective, and produces an adequate structural layer for road construction. The measured moisture-density curves for manufactured sand and limestone screenings are about the same, and the moisture-strength curves show a dramatic decrease in strength beyond the optimum moisture content for strength. Durability testing concluded that CKD stabilized manufactured sand and limestone screenings are not viable construction alternatives, and the addition of class C fly ash with CKD significantly increased the durability of the mixtures. The third project concluded that a link exists between subgrade non-uniformity and pavement performance. Field testing, with the DCP, Clegg Impact Hammer, nuclear density gauge, and GeoGauge, and statistical analysis of subgrade materials concluded that granular subbase, self-cementing fly ash treated subgrade, and HFA decrease the variability of field results. Finite element modeling analysis proved that a link exists between subgrade non-uniformity and pavement performance. Uniform modeling conditions produced lower average deflections and stresses increasing pavement life. Statistical analysis concluded that modeling uniform subgrade conditions produce average stresses that have less variability than those for non-uniform modeling conditions. Pavement response reliability increased with the addition of uniform subgrade, proving that subgrade non-uniformity influences pavement performance.
Download or read book Measuring in Situ Mechanical Properties of Pavement Subgrade Soils written by David E. Newcomb and published by Transportation Research Board. This book was released on 1999 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: This synthesis report will be of interest to pavement and geotechnical design and research engineers, geologists and engineering geologists, and related laboratory personnel. It describes the current practice for measuring in situ mechanical properties of pavement subgrade soils. The tests conducted to measure the mechanical properties of soil strength and stiffness are the primary topics, and these are discussed in the context of design procedures, factors affecting mechanical properties, and the variability of measurements. Information for the synthesis was collected by surveying U.S., Canadian, and selected European transportation agencies and by conducting a literature search. This TRB report provides information on existing and emerging technologies for static and dynamic, and destructive and nondestructive testing for measuring in situ mechanical properties of pavement subgrade soils. Correlations between in situ and laboratory tests are presented. The effects of existing layers on the measurement of subgrade properties, and soil spatial and seasonal variability are discussed. Most importantly, the use of soil properties in pavement design and evaluation are explained. New applications or improvements to existing test methods to support the use of mechanistic/stochastic-based pavement design procedures are also explained.
Download or read book An Introduction to Pavement Engineering Volume 2 written by J. Paul Guyer, P.E., R.A. and published by Guyer Partners. This book was released on 2019-10-02 with total page 407 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introductory technical guidance for civil engineers and construction managers interested in design and construction of pavement for streets and highways. This guidance comes in two volumes. This volume contains the following: 15. PERFORMANCE PROBLEMS WITH PAVEMENTS 1 16. CONSOLIDATION, FINISHING AND CURING PORTLAND CEMENT CONCRETE PAVING 17. CONSTRUCTION AND CONTRACTION JOINTS IN PORTLAND CEMENT CONCRETE PAVEMENT 18. MATERIALS, PRODUCTION AND MIXING FOR PORTLAND CEMENT PAVEMENT 19. PERMEABLE CONCRETE PAVEMENT 20. REINFORCEMENT AND LOAD TRANSFER FOR PORTLAND CEMENT CONCRETE PAVEMENT 21. ELASTIC LAYERED METHODS OF PORTLAND CEMENT CONCRETE OVERLAY PAVEMENT DESIGN165 22. RESIN MODIFIED PAVEMENT 23. RIGID PAVEMENT DESIGN 24. REPAIR OF RIGID PAVEMENTS 25. SOIL STABILIZATION FOR PAVEMENTS 26. CONSTRUCTION METHODS FOR SOIL STABILIZED PAVEMENTS 27. TACK COAT FOR PAVEMENT.
Download or read book An Introduction to Concrete Pavements written by J. Paul Guyer, P.E., R.A. and published by Guyer Partners. This book was released on 2018-01-20 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introductory technical guidance for civil engineers and construction managers interested in design and construction of concrete pavements. Here is what is discussed: 1. PURPOSE 2. SCOPE 3. RESPONSIBILITIES, STRENGTH, AND AIR CONTENT 4. CEMENT 5. AGGREGATES 6. ADMIXTURES 7. POZZOLANS 8. MISCELLANEOUS MATERIALS 9. WATER 10. SAMPLING AND TESTING OF MATERIALS 11. DELIVERY AND STORAGE OF MATERIALS 12. GRADE CONTROL 13. PROPORTIONING 14. SUBGRADE, BASE, FORMS, AND STRING LINES 15. BATCHING AND MIXING 16. PLACING 17. FIELD TEST SPECIMENS 18. FINISHING 19. CURING 20. GRADE AND SURFACE SMOOTHNESS REQUIREMENTS 21. TOLERANCES IN PAVEMENT THICKNESS 22. REPAIRS OF DEFECTIVE PAVEMENT SLABS 23. JOINTS 24. PAVEMENT PROTECTION 25. MEASUREMENTS 26. REFERENCES.
Download or read book An Introduction to Soil Stabilization for Pavements for Professional Engineers written by J. Paul Guyer, P.E., R.A. and published by Guyer Partners. This book was released on with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introductory technical guidance for civil engineers and construction managers interested in stabilization of soils for street and highway pavements. Here is what is discussed: 1. INTRODUCTION, 2. SELECTION OF ADDITIVE, 3. DETERMINATION OF STABILIZER CONTENT.
Download or read book An Introduction to Soil Stabilization for Pavements written by J. Paul Guyer, P.E., R.A. and published by Guyer Partners. This book was released on 2018-02-10 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introductory technical guidance for civil engineers interested in design of stabilized soil for pavements. Here is what is discussed: 1. INTRODUCTION 2. SELECTION OF ADDITIVE 3. DETERMINATION OF STABILIZER CONTENT.
Download or read book An Introduction to Soil Stabilization for Pavements for Construction Managers written by J. Paul Guyer, P.E., R.A. and published by Guyer Partners. This book was released on 2022-06-06 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introductory technical guidance for construction managers interested in construction of pavements for streets and highways. Here is what is discussed: 1. INTRODUCTION, 2. SELECTION OF ADDITIVE, 3. DETERMINATION OF STABILIZER CONTENT.
Download or read book Pavement Subgrade Performance Study written by Vincent C. Janoo and published by . This book was released on 2003 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mechanistic design or evaluation of pavements requires fundamental material properties and material failure criteria as a function of load and environmental effects such as temperature and moisture content. The strength or weakness of a pavement structure is based on the performance of the subgrade. The current subgrade failure criteria used in many mechanistic design/evaluation methodologies were surmised mainly from tests that did not consider the effects of subgrade soil type or moisture content. Because of these limitations the current FHWA-sponsored Subgrade Performance Study was designed to investigate and upgrade the failure criteria of subgrade materials. The project plans to study the effect of subgrade type and moisture content on the failure criteria. This international study includes testing at the U.S. Army Cold Regions Research and Engineering Laboratory where test sections are being constructed using four subgrade types and three moisture contents and subjected to accelerated loading. The sections are instrumented with stress strain moisture and temperature sensors. In this study the ambient temperature is held at around 20 deg C. This report provides an overview of the test program and testing procedure. Subsequent reports will detail the construction of each test section the data acquired and the results.
Download or read book AASHTO Guide for Design of Pavement Structures 1993 written by American Association of State Highway and Transportation Officials and published by AASHTO. This book was released on 1993 with total page 622 pages. Available in PDF, EPUB and Kindle. Book excerpt: Design related project level pavement management - Economic evaluation of alternative pavement design strategies - Reliability / - Pavement design procedures for new construction or reconstruction : Design requirements - Highway pavement structural design - Low-volume road design / - Pavement design procedures for rehabilitation of existing pavements : Rehabilitation concepts - Guides for field data collection - Rehabilitation methods other than overlay - Rehabilitation methods with overlays / - Mechanistic-empirical design procedures.
Download or read book Hydraulic Road Binder HRB and Its Use for Subgrade Stabilization in Ontario Canada written by Shenglin Wang and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The term "subgrade" refers to the in-situ material composed of natural soil located underneath the pavement structural layers. The quality of natural subgrade is highly influenced by soil type, moisture content, and organic content. Furthermore, the failure of subgrade soils may lead to severe pavement distresses including rutting, potholes, and cracking. In order to enhance the subgrade engineering properties, a variety of stabilization methods have been developed. One of the most popular and cost-effective methods is in-situ subgrade soil stabilization using hydraulic binders. In-field soil modification and stabilization frequently use Portland cement as the chemical additive. Such method significantly enhances the engineering characteristics of soils in terms of plasticity, strength, stiffness, and durability. Despite the advantages, the chemical mixing also brings some disadvantages including rapid setting, drying shrinkage cracking, and higher cost. Recently, Supplementary Cementitious Materials (SCMs) made of by-products and industrial secondary materials (e.g. granulated blast furnace slag, cement kiln dust and fly ash) have been studied extensively to reduce the use of cement. Hydraulic Road Binder (HRB) is a European specified material designed for treatment of road bases, subbases as well as earthworks. HRB contains both cement clinker and a substantial amount of SCMs. Therefore, the use of HRBs has the potential to be more cost-effective and environmentally friendly than Portland cement. However, the research and application of HRB is new in Canada. The study started with an investigation of cement and different formulated HRBs in the form of paste and mix (mortar). Then, selected HRBs were used to evaluate their impacts on the chemical and physical properties of three local subgrade soils. In addition, a field application of weak subgrade stabilization using cement was introduced. Lastly, a study aiming to predict the long-term pavement performance was conducted in order to simulate the impact of stabilized subgrade in pavement design. The research findings are summarized as follows: • HRBs were found to reduce the setting time, reduce the speed of hydration, and the hydration temperature compared to Portland cement. The hydration products in hydrated HRBs and Portland cements were generally the same, but their contents were different. In addition, a reduction of drying shrinkage was observed in HRB mortars especially in those containing substantial SCMs. Regarding the strength, several HRB mortars had equivalent strength as cement mortars after 28 days of curing. Furthermore, a linear correlation was found between the compressive strength and flexible strength. Statistical analysis further revealed that the strength of HRB mix highly correlated to the content of GU, GUL, and GGBFS. • All the three subgrade soils (named Dresden, Blenheim, and Niagara) were fine-grained soils with substantial silt- and clay- sized particles. Ignition test indicated that all the three soils include high content of organic matters. In particular, Niagara soil with high plasticity, high organic material content had lower strength and modulus compared to the other two soils. Using the stabilizers, the soil's pH values increased to around 12 and above. In addition, significant improvement had been observed in stabilized soils in terms of strength, durability, and resilient modulus. Nevertheless, the clay particles and organic matters inhibited the treatment. Increase of stabilizer content further promoted improvement. In particular, HRB-4LS had the best stabilization effect followed by GU, HRB-4LF, and HRB-3S. On the other hand, HRB-2S and HRB-3C treated soils had lower strength and modulus values. Finally, statistical analysis indicated that soil's UCS values correlated with binder strength, binder content, curing, and untreated soil's strength. • Field testing indicated that the workability and conditions of subgrade were significantly improved by hydraulic binder. Moreover, the modulus of subgrade surface further increased with curing time. After one year of service, the conditions of roads were good in most test sections. Furthermore, long-term pavement performance prediction (LTPP) revealed the feasibility of using cement and HRB stabilized subgrade to reduce the thickness of subbase layer. In terms of international roughness index and subgrade deformation, pavements constructed with HRB stabilized subgrade materials had equivalent performance as cement treated one over their design life. To summarize, this study focused on evaluating the used of Hydraulic Road Binders formulated in Canada for pavement subgrade stabilization. The research showed that HRB mortars have similar or slightly better strength compared to Portland cement alone with sufficient curing time. Moreover, The HRB improved subgrade soils were shown to perform adequately using several HRB types. In addition, the use of HRB-stabilized subgrade in pavement structure would improve the LTPP of pavement. Therefore, the use of HRB in the subgrade stabilization could be a promising solution in pavement construction due to its equivalent performance and with the potential environmental and cost advantages.
Download or read book An Introduction to Rigid Pavement Design for Professional Engineers written by J. Paul Guyer, P.E., R.A. and published by Guyer Partners. This book was released on 2022-03-03 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introductory technical guidance for civil engineers and construction managers interested in design of rigid portland cement concrete pavements for streets and highways. Here is what is discussed: 1. RIGID PAVEMENT DESIGN, 2. RIGID PAVEMENT BASE COURSES, 3. CONCRETE PAVEMENT, 4. PLAIN CONCRETE PAVEMENT DESIGN, 5. REINFORCED CONCRETE PAVEMENTS, 6. DESIGN CURVES.
