How more than three decades of engineering practice became an attempt to make pavement engineering knowledge accessible across professional, linguistic and national boundaries.
When I began writing Pavement Structures in German-Speaking Countries – Design, Construction and Maintenance, I did not intend to create a 1,077-page book.
The starting point was much simpler. Throughout my many years of professional work as a civil engineer in road and pavement engineering, I repeatedly encountered the same challenge: Germany, Austria and Switzerland possess an enormous body of technical knowledge on pavement design, materials, construction, condition assessment and maintenance. Yet this knowledge is distributed across different standards, guidelines, technical publications and practical experience – and much of it remains difficult to access for an international audience.
This led to a question that eventually became the starting point of the book:
How could this knowledge be presented within a common engineering context while also making the connection between standards, scientific understanding and real-world engineering practice visible?
Three countries – but shared engineering questions
My intention was never simply to place three national systems of standards side by side or to determine which system is “better”.
A much more interesting question was what can be learned from different engineering traditions.
Regardless of national borders, a pavement structure must fulfil the same fundamental tasks: carry traffic loads, withstand climatic effects, manage water, provide long-term performance and allow economically viable maintenance throughout its service life.
Germany, Austria and Switzerland address many of these challenges using partly different classifications, materials, design approaches and technical regulations. It is precisely these differences that make comparison valuable.
As the writing progressed, the project therefore evolved from a collection of technical information into an attempt to make the engineering logic behind technical solutions visible.
How individual topics became 1,077 pages
The size of the book was not planned in advance.
With every chapter, it became increasingly clear that individual topics could not meaningfully be treated in isolation. A design method can only be understood when its boundary conditions are known. The properties of an asphalt mixture must be considered in relation to production, placement, compaction, traffic loading and ageing. And the quality of a pavement structure is ultimately demonstrated not only during design and construction, but through its performance over many years of service.
The work eventually grew to 1,077 pages, containing 1,460 figures and 175 tables.
The large number of illustrations was a deliberate choice. Engineering is not communicated through text, equations and standards alone. Drawings, construction-site photographs, distress patterns, testing methods and structural details can often explain engineering relationships more directly than several pages of text.
Some examples illustrate the range of this visual documentation:
These examples reflect one of the central ideas of the book: pavement structures cannot be understood through a single design equation or one set of standards alone. Material behaviour, structural design, climate, water, traffic loading, construction quality and maintenance interact throughout the life of a pavement.
Between standards and the real road
One theme runs throughout the entire book: the relationship between scientific and technical principles and their practical implementation.
Standards and guidelines are indispensable. Research expands our understanding of materials, loading and structural behaviour. But a pavement is ultimately constructed under real conditions – with actual subgrade conditions, real materials, weather influences, construction logistics and unavoidable practical constraints.
My own engineering practice has strongly shaped the way I understand this relationship.
For this reason, I wanted the book not only to describe what a particular standard or method requires, but, wherever possible, also to explain why a particular engineering solution is selected and how that decision carries through design, construction, assessment and maintenance.
The book therefore considers the pavement life cycle as an interconnected system: from fundamental principles and structural design through asphalt and concrete pavements and other pavement types to condition assessment, maintenance, rehabilitation and long-term asset preservation.
From design to construction and maintenance, pavement performance can only be understood when materials, structural design, execution and service conditions are considered as parts of one engineering system.
An unexpected challenge: language
One of the most demanding aspects of writing the book was not a particular calculation or structural design problem, but technical terminology.
A technical term used in a German or Austrian standard cannot always be translated word for word into English. Even within German-speaking countries, terminology and its precise technical meaning may differ.
For an international English-language publication, this meant that terminology had not simply to be translated, but its engineering meaning had to be conveyed accurately.
This work ultimately also resulted in a Technical Dictionary of Road and Pavement Engineering in German, English and Montenegrin (GER–EN–MNE).
For me, this dictionary is not merely an appendix. It represents one of the broader objectives of the entire book project:
Technical knowledge should not end at language barriers.
Why accessibility became part of the project
This consideration ultimately influenced not only the language of the book but also the way it was made available.
Large specialist engineering books can be difficult to afford for students, individual engineers and institutions in countries where access to technical literature is limited.
For this reason, the official PDF edition was deliberately made available at a comparatively moderate price. The objective is not to maximise commercial return, but to make an extensive and scientifically grounded engineering reference accessible to as many interested readers as possible.
Infrastructure knowledge, in particular, should be internationally transferable. Roads differ in their standards, materials and climatic conditions, but the fundamental engineering questions are remarkably similar around the world.
What remains after 1,077 pages
After a project of this scale, the most important lesson for me is not a particular equation, pavement type or technical guideline.
It is the conviction that good infrastructure emerges from the interaction of scientific understanding, careful engineering design, practical experience and a willingness to learn from one another.
Germany, Austria and Switzerland have accumulated highly developed but partly different traditions and technical experience in pavement engineering over many decades. If this book helps make some of that knowledge more accessible internationally, encourages comparison, and strengthens the exchange between research and engineering practice, then it has achieved one of its most important objectives.
And perhaps that is the real story behind the book:
Many individual projects, standards, observations and experiences ultimately became not merely a collection of 1,077 pages, but an attempt to pass engineering knowledge on to others.
Explore the book
Pavement Structures in German-Speaking Countries – Design, Construction and Maintenance
Official PDF Edition / Book information:
https://payhip.com/b/72tph
Scholarly monograph / DOI:
https://doi.org/10.5281/zenodo.18041355
Citation:
Hrapović, K. (2025). Pavement Structures in German-Speaking Countries – Design, Construction and Maintenance. Zenodo. https://doi.org/10.5281/zenodo.18041355