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Seminar details

CIVILS & PIPELINES 2002

TUESDAY 11 JUNE 11.30

A new specification for PFA as a fill material. Dr Mike Winter, TRL A new TRL report - TRL 519: Specification of pulverised-fuel ash for use as a general fill, will be launched at the seminar. Pulverised-fuel ash (PFA) has a long history of successful use as a fill material stemming back to the 1950s. However, the current series 600, Specification for Highway Works, or Manual of contract documents for highway works (MCHW), treats PFA as a manufactured material and applies end product specification criteria requiring maximum dry density and optimum moisture content.

In practice, for technical reasons, these criteria are very difficult to comply with when using PFA. The United Kingdom Quality Ash Association (UKQAA) commissioned TRL and the University of Newcastle to review MCHW.

The resulting report, TRL 519, compares the end product and method specifications and concludes that there is no reason why PFA could not be used for general fill applications using the method specification. This is based on significant historical evidence that method specifications have successfully been used to control compaction of PFA fills that have remained in place for over 40 years. The introduction of a method specification would enable greater use of PFA and thus reduce the use of virgin aggregates and the UK-wide need for landfill.

12.30 Reinforced road pavements - polymeric and steel mesh reinforcement. Nicholas Reck, Maccaferri, South Africa and JanMaarten Elias: Colbond Geosynthetics, The Netherlands Maccaferri and Colbond Geosynthetics say this seminar will be a state-of-the-art presentation on the use of steel mesh and polymeric reinforcement in road pavements. The wide range of different reinforcing material types has led to some confusion over which product is best suited for use in pavements - and more importantly, where to use products in the pavement structure.

After a number of years of worldwide experience and research, Maccaferri and Colbond Geosynthetics have built up significant confidence and now adopt specific design approaches to the various engineering problems involved.

13.30 Gas dispersal - protecting buildings from contaminated ground.

Adrian Pollitt, Cooper Clarke Group Pollitt will outline the types of ground gases and where they may be met. He will explain the basic strategies that can be adopted to deal with them - either passive or active dispersal systems. The seminar will discuss, in detail, the suitability of particular membranes for various applications and appropriate methods of ventilating gases to free air.

15.30 Engineered solutions using geocomposites, Peter Langley, Geofabrics Langley will use a variety of problems associated with highway, railway, landfill and contaminated land applications to highlight the advantages of using geocomposites. The seminar will describe the benefits for designers and installers of placing a single product combining the functions of drainage, impermeability, filtration, protection, reinforcement and separation.

Langley will describe how the increasing cost and the environmental impact of using mineral aggregates to provide just some of these functions emphasises the benefits of using geocomposite materials.

WEDNESDAY 12 JUNE

10.30 High impact compaction technology and ground response monitoring & verification. Dermot Kelly, Landpac Ground Engineering Wobbly rollers are at the heart of Landpac's novel High Energy Impact Compaction system which will be explained in the seminar (Ground Engineering May 2002). Landpac is a Johannesburg-based company with operating centres in Australia, China, Saudi Arabia and the UK. 'Hong Kong's Chek Lap Kok Airport really got us started, ' says Kelly.

The HEIC rollers have cam-like lobes which deliver massive compaction force to the ground as they are towed across a site. Both fill and natural materials can be consolidated by the technique. Proof measurement of 100% of the compacted site is possible using the 'CIR' real time soil response measurement linked to a global positioning system fitted to the special rolling equipment.

12.30 Sustainable pavement technologies.

Derek Fordyce, Weeks Group Ifthe pavement industry is to progress successfully it will require materials producers, consultants, contractors and end users to collaborate to develop environmentally sustainable materials, technologies and techniques that offer more effective ways of delivering pavement engineering solutions. Pavement Technology is a new venture between Heriot-Watt University and the Weeks Group aimed at developing 'next generation' pavement technologies.

13.30 Typical applications and construction procedures for lime/cement stabilisation of soil.

Jonathan Smith, Geofirma Soils Engineering With increasing taxes on the disposal of surplus soil from construction sites and the import of stone aggregates, soil stabilisation is becoming the preferred method for site preparation, as it uses existing materials to produce structural fill and sub-base layers for ground slabs and external works.

Most UK soil stabilisation is being undertaken on commercial developments, primarily for distribution centres and warehousing. However it is being increasingly used on trunk roads and other public works projects such as the Manchester Commonwealth Stadium and Channel Tunnel Rail Link.

The seminar will review the typical applications, design and construction procedures and overall benefits relevant to this method of ground treatment.

15.30 Clients & consultants - working well together. An ACE Best Practice seminar Engineering consultancy has undergone a period of dramatic change, says the Association of Consulting Engineers: 'More competition and increased emphasis on best practice has seen firms rise to that challenge and we are delighted to host our first best practice programme seminar at Civils 2002.' The seminar will draw on examples from the ACE's Client Best Practice Award and address the critical issues in working successfully in partnership with clients. What are clients looking for? How can engineers work with clients to ensure the best use of engineers and engineering? And how can consulting engineers and others input effectively to projects and contribute to clients' thinking?

THURSDAY 13 JUNE 10.30

Soil stabilisation. Hedley Greaves, Buxton Lime Industries Greaves will concentrate on the practical and theoretical applications of lime for insitu soil treatment. There will be a demonstration of the equipment used for stabilisation and of the site procedures that need to be adopted. An exploration of the theory of how and why lime stabilisation works will include a study of the three basic reactions obtained. The link between lime treatment and treatment with pulverised-fuel ash and blast furnace cement will also be examined. Practical applications of each technique will be demonstrated by looking at recently completed projects.

Suggestions will also be made about some of the more unusual applications of lime stabilisation and the use of lime/PFA systems for sub-base and road base.

11.30 A practical demonstration of screw pile technology. Peter Dunn, Screwfast Foundations Peter Dunn is determined to retain his 'star turn' title from Civils 2000 with his Civils 2002 seminar which will give a gadget-assisted demonstration of screw piling.

The piling technique can install a tension/compression pile up to 20t capacity in 20 minutes using an attachment to a backhoe loader. The piles are said to be ideal for foundations of structures such as masts that are subject to cyclic loading. They were used recently to carry the docking system of the Cargolifter balloon, the world's largest modern dirigible.

Dunn's presentation will emphasise that screw piles are not a new invention, having carried lighthouses on estuarial soils in the 1830s and Brighton's West Pier since 1863.

Screw piles were revived in the 1950s by Robert Chance in the US, primarily as a tension anchor installed by hydraulic machinery.

Developments in Australia resulted in tubular shaft piles with increased compression capacity.

12.30 Collaborative working practices within the civil engineering market.

Infrasoft Solutions Current trends towards design and build or design, build and operate mean that civil engineering firms are merging, opening field offices and forming strategic alliances all over the globe. There is an increasing need to align large teams because of partnering, acquisitions and joint ventures.

This business climate calls for an increasing level of co-ordination and teamwork to gain competitive advantage. Infrasoft's seminar looks at industry trends and solutions and how multiple companies or departments who are geographically spread and trained in different design codes, can collaborate on large and small civil engineering construction projects.

13.30 The Ménard Pressuremeter - innovative solution for site investigation and foundation design.

Arnaud Finiasz, Fondasol UK What makes the Ménard pressuremeter so innovative compared with other insitu testing techniques is that the measured Limit Pressure (P LM ) and Deformation Modulus (E M)are used directly to predict shallow and deep foundation load capacity and associated settlements with high precision.

The Ménard pressuremeter has been used in France for the past 40 years as an everyday soil test for ground investigations. Over the years, the design rules have been updated as performance data has become available. These well-established design rules are now included in Part 3 of Eurocode 7, which is due to come into force in 2003.

During the presentation, Finiasz will describe the Ménard pressuremeter equipment and explain the test procedure. He will then demonstrate its benefits in everyday ground investigation works and present a case study of recently completed work at Canary Wharf, London. Tests are cost effective and give precise insitu soil deformation and resistance characteristics to optimise foundation design. The presentation aims to help understanding among UK practitioners.

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