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INSPECTOR'S ANUAL FOR SLURRY SYSTEMS NOTICE It is not intended or recommended
that this guideline be used as a verbatim specification.
It should be used as an outline, helping user agencies establish their particular project specification. Users should understand materials.
that almost all geographical
areas vary as to the availability
of
An effort should be made to determine what materials are reasonably available,
keeping in mind system compatibility and specific job requirements. Contact ISSA for answers to questions and for a list of ISSA member contractors
and companies.
International Slurry Surfacing Association ,/ /'
#3 Church Circle • PMB 250 • Annapolis, MD 21401 (410) 267-0023 www.slurry.org
© 2010 by International Slurry Surfacing Association No reproduction
/
of any kind may be made without written permission of ISSA.
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Table of Contents
7 0 9 36 9 11 E t E
I.
INTRODUCTION A. Foreword B. Background C. Purpose of the Manual
1 1 1 2
II
SLURRY SySTEMS A. Terminology B. The Benefits of Slurry Systems C. Application D. Project Selection
4 4 4 5 6
,
III
MATERIALS A. Aggregate B. Aggregate Composition C. Emulsified Asphalts D. Additives
8 8 10 11 13
IV
SLURRY SYSTEM DESiGN A. Slurry Seal Mixtures , B. Micro Surfacing Mixtures C. Slurry System Mix Designs D. Equipment Calibration
15 15 15 16 19
V.
CONSTRUCTION OF SLURRY SYSTEM TREATMENTS A. Stockpile B. Surface Preparation C. Traffic Control D. Notification E. Application F. Application Rates G. Inspection Points
.24 24 25 27 27 27 35 37
VI
CONTRACT ADMINISTRATION A. Pre-Construction Meeting B. Job Site Safety C. On-Site Sampling and Testing of Materials D. Construction Phase E. Opening to Traffic F. Measurements and Payments G. Project Close Out
.42 42 43 .43 44 45 45 46
ISSA INSPECTOR'S
MANUAL FOR SLURRY SYSTEMS
I
• I
i:
VII
PROBLEM SOLViNG A. Slurry Seal B. Micro Surfacing
47 47 54
VIII
SPECIAL SITUATIONS A. Application Rates / Multiple Lifts B. Cul-de-sacs C. Excessively Rich, Flushed, or Bleeding Asphalt Surfaces D. Expressway Shoulders and Ramps E. Filling Large Cracks F. Grinding and Milling of Pavement G. High Quarter Crown H. Partial Width Passes 1. Placing Next to Buildings J. Playground Equipment and Poles K. Profiling of Roadway L. Protecting Special Markings and Stencils M. Raised Pavement Markers N. Rolling of Slurry Systems O. Thermo Plastic Markings / Plastic Tape Markings
67 67 67 67 68 68 68 69 69 69 69 69 69 70 70 70
APPENDiCES A. Glossary of Terms B. Test Methods C. Useful Construction Conversions D. Inspectors Equipment E. Construction Records F. Field Calibration Procedure Worksheets G. Example ofa Slurry Seal Mix Design H. Example of a Micro Surfacing Mix Design 1. Recommended Performance Guidelines for Emulsified Asphalt Slurry Seal (AI05) J. Recommended Performance Guidelines for Micro Surfacing (AI43)
ISSA INSPECTOR'S
MANUAL FOR SLURRY SYSTEMS
71 71 73 75 77 77 80 83 86 89 102
INTERNATIONAL SLURRY SURFACING ASSOCIATION (ISSA) INSPECTOR1S MANUAL
I. INTRODUCTION A. Foreword The Manual for Slurry Systems is a distillation of material contained in the ISSA's "Inspector's Manual (MA-l)" and "Micro surfacing: Quality Assurance and Use Guidelines for Micro surfacing" assembled by the National Center for Pavement Preservation. Although the ISSA manual cannot cover all information that may be applicable in every part of the world, we have attempted to merge the two documents and update the material so as to provide information most important to successful slurry system construction.
B. Backgroundl Slurry surfacing was first developed in Europe, where it is generically known as micro-asphalt concrete. In the early 1930s, a coating consisting of a mixture of very fine aggregate, asphalt emulsion, and water was placed on a road in Germany. This new and promising technique in maintaining road surfaces marked the beginning of slurry surfacing development. Worldwide experimentation continued, but it was not until the 1960s, with the introduction of improved emulsifiers, continuous flow machines, and set control additives that real interest was shown in slurry systems for a wide variety of applications. In the mid-1970s, Screg Route, a French company, designed Seal-Gum, a micro-asphalt concrete that was subsequently improved by the German firm Raschig, and marketed in the United States under the trade name "Ralumac" during the early 1980s.
Figure 1: Slurry System Treatment Project
1
See Publication No. FHWA-SA-94-051 "State of the Practice Design, Construction, Hassan Raza, P.E., Federal Highway Administration, June 1994.
and Performance
1 ISSA INSPECTOR'S
MANUAL FOR SLURRY SYSTEMS
of Micro surfacing,"
by
Since the introduction of Ralumac in 1980, micro surfacing has been used by many state DOTs and local agencies in the United States on moderate to high volume roads. After its introduction in Kansas, states such as California, Michigan, North Carolina, Ohio, Oklahoma, Pennsylvania, Tennessee, Texas, and Virginia use micro surfacing. In fact, micro surfacing applications have conclusively demonstrated that the treatment can be a highly successful preservation and maintenance technique. However, despite this success, it is crucial that managers and engineers fully understand the treatment's limitations, performance variables, and materials / mixture issues to ensure that the treatment is used only when appropriate. Continuing advancements in mixing methods, emulsions and machinery have made slurry systems today's choice in providing highly durable, low cost surface treatments. Today, slurry systems are now used extensively throughout the world.
Figure 2: Slurry System Placement in Latin America
C. Purpose of the Manual The purpose of this manual is to provide practical information to assist in the construction inspection of slurry system projects (slurry seal and micro surfacing). The ISSA's Board of Directors authorized the manual's development to provide an educational tool that could be used by persons possessing limited familiarity with slurry system methods. The inspector has an essential and vital presence during the construction of every slurry system project. The inspector's job is to ensure that the slurry system design described in the plans and specifications produces a strong durable coating on the pavement. Consequently, the inspector needs to possess knowledge, awareness, keen observational skills, and diplomacy to successfully perform his job, one of the most difficult and responsible in the construction industry.
This manual is designed to provide the basic knowledge needed to understand and evaluate slurry systems and construction as well as providing enough background knowledge to assist the inspector to make good common sense decisions. It also provides guidance relative to the appropriate materials necessary for various applications of slurry systems, and the analytical procedures to assure the desired service life. The manual will detail areas of importance to watch for in the field. If additional information is desired, much of the information contained here is expanded further in various ISSA Technical Bulletins and Guidelines. A manual alone is insufficient and should be used in conjunction with other learning tools, such as classroom, on-the-job, or in-the-lab training. The job site is an ideal classroom to observe, ask questions, and obtain answers. Highly qualified, quality-oriented ISSA professionals can provide as much detailed, technical information as an inspector may request. Formal training opportunities are available through the ISSA slurry system workshop and ISSA endorsed one-day training classes. Basic specification guidelines can be found in ISSA publications AIOS for slurry seal surfaces and Al43 for micro surfacing (See Appendices G and H). Further technical information on design and testing can be found in Design Technical Bulletins available from ISSA.
This publication is produced and distributed worldwide by the International Slurry Surfacing Association (ISSA). ISSA is an international non-profit trade association comprised of slurry & micro surfacing, chip seal, and crack treatment contractors, equipment manufacturers, public officials, research personnel, consulting engineers and associated industry interests, working together to promote the increased and more efficient use of slurry, micro surfacing, chip seal and crack treatments in roadway pavements.
Phone: 410.267.0023
#3 Church Circle - PMB 250 • Annapolis, MD 21401 USA • Fax: 410.267.7546 • e-mail: krissoff@slurry.org • website: www.slurry.org
Printed
in USA -
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