Tuesday 27 April 10.30 Theatre A Client's view of remedial work on a Galligu and heavy metal contaminated site at Halton, Widnes Mike Curtis, Halton Borough Council and Chris Holt, Powerbetter Environmental Processes Halton is one of the most contaminated parts of Britain. Alkaline industry waste deposits, locally known as Galligu, are a particular problem. In 2003 a 2.5ha site was remediated using an innovative insitu stabilisation and solidification process (GE December 2003).
Since 1974, Halton Borough Council has brought back into use 180ha of Galligu contaminated sites, at a cost of over £20M. Remove and replace was the preferred remediation method, thus moving the problem elsewhere. This was not an option for the site reviewed as about 87,000m 3of material would have had to be removed to landfill. A more sustainable solution was needed.
A stabilised and solidified capping layer was designed using binders. These included cement and Powercem, a secondary additive. Permeability and leachate potential was greatly reduced and significant strength gains recorded.
Stabilisation operations were complete in five weeks and leachate extracts, after stabilisation, were below maximum values specified in the Water Supply (Water Quality) Regulations, 2000.
12.45 Theatre B Helical pulldown micropiles support museum celebrating Lewis & Clark Expedition, Missouri, USA Roy Jennings, MDTI (Midwest Diversified Technologies) The Discovery Expedition of St Charles, Missouri, is a non-profit organisation dedicated to rediscovering the legacy of US explorers Lewis and Clark.
It was decided to build a two-storey museum on the flood plain of the Missouri River, near the starting point of the Lewis & Clark Expedition. The lower level houses replica boats which are moved to higher ground in times of flood. Its open span structure allows flood waters to pass without damaging the structure or the museum above.
Heavily-loaded footings or piles were needed to support the 374kN working loads, but spread footings could not be used because of the compressible soil profile. The historical location precluded dynamically driven piles.
Instead, 63 uncased helical pulldown micropiles were driven to the bearing stratum with minimum disturbance.
There was no spoil to dispose of and the piles were completed in eight days.
14.30 Theatre A Unexploded ordnance: the unknown risk Simon Cooke, Bactec International Bactec will be a company familiar to many engineers who have had to deal with unexploded bombs and shells, whether in Bow in London or in the Balkans. The seminar promises a sobering insight to this lethal detritus of war and will cover what unexploded ordnance is; what risks are posed;
answer the question 'Who is responsible for the carriage of that risk?'; describe what Bactec can offer to mitigate the risk; and give some examples of dealing with unexploded ordnance using recent case studies.
14.45 Theatre B Achieving sustainability in ground improvement and deep foundation techniques Colin Serridge and Ondrej Synac, Pennine Vibropiling The construction industry, and geotechnical contracting, is under pressure to play a more active role in environmentally sustainable development.
In the ground improvement sector, vibro stone column techniques are the most common form of ground treatment in the UK. There is an increasing demand for use of reclaimed materials (recycled and secondary aggregates) for stone columns.
However, where use of such materials is considered as an alternative to natural primary aggregates, it is important there are quality control procedures to ensure these materials are 'fit for purpose'.
The seminar will discuss technical requirements for vibro stone column aggregate and some applications of recycled and secondary aggregates. An environmentally acceptable and novel approach to addressing the potential for downward migration of contaminants through stone columns on brownfield sites with underlying sensitive ground waters will also be highlighted.
In the deep foundations sector, the use of vibro concrete columns in certain soils permits shorter design lengths, resulting in more efficient use of concrete and less demand on primary aggregate resources. New auger displacement piling systems, in addition to virtually eliminating spoil generation, permit better and more efficient design and bearing capacity characteristics, leading to more sustainable solutions.
15.30 Theatre A Engineering geophysics, the state of the art for site investigation Dr John Reynolds, Reynolds Geoscience Geophysical instrumentation and data processing techniques have advanced tremendously over the past decade, allowing techniques to be used for site investigation that were previously the preserve of the oil industry.
New branches of science have emerged allowing insitu measurement of engineering properties, with obvious benefits for sampling speed, spatial resolution and accuracy.
Correctly specified, a modern integrated geophysical survey carried out with borehole and trial pits can vastly improve the knowledge of a site with benefits for both foundation and structure design and remediation.
Wednesday 28 April 10.45 Theatre B Consultants' professional indemnity insurance - is there a crisis?
Nelson Ogunshakin, Association of Consulting Engineers Professional indemnity insurance and industry attitudes to risk and its management are some of the hottest issues facing consultants.
Spiralling costs of cover and rocketing excesses are a concern for every firm in a hardening insurance market.
What can be done to improve the situation? Are there lessons to be learned from other countries? What is the attitude of insurers to consultants' PI? How can the industry work together to make things better? Find out ACE's views on these issues (and more) at this seminar which no consultancy firm can afford to miss.
3.45 Theatre B Structural Eurocodes - major implications for UK construction Haig Gulvanessian, BRE Structural Eurocodes used for designing buildings and civil engineering structures will become mandatory for European public works and are set to become the de facto standard for the private sector, both in Europe and worldwide.
These codes exist in ENV form; the conversion process to EN has begun and will be completed by 2005.
National codes of practice will be withdrawn after a co-existence period of up to five years (GE March 04).
These changes will have profound implications for the UK construction industry. Eurocodes Expert is an ICE Group initiative to help clients, designers, contractors and suppliers understand and use the new European structural design codes.
15.30 Theatre A Repetitive strain injury of foundations Peter Dunn, Screwfast Foundations Structures near traffic on roads and rail are subjected to frequently applied loads from the same direction. Metal fatigue is dealt with in Standards, but as far as the presenter is aware there are no guidance documents on repetitive loading. The only 'design' method seems to be to assume a big factor of safety applied to a 1 in 50 year loading will make a foundation serviceable for whole-life battering by frequent smaller loads.
Thursday 29 April 10.30 Theatre A A new approach to basement design and construction John Theos, Robert Fisher and Charles Attard, Corus Hydrobarrier and Urban Splash The seminar will highlight the benefits of steel sheet piles in basement construction. The three presenters will cover waterproofing aspects, design guidance, installation techniques and case studies.
Hydrobarrier provides a package for sealed sheet piling solutions including basements, tanks and contaminated land barriers. The seminar will offer an opportunity to develop awareness of sealed sheet piling construction and meet with experts from many parts of the construction industry.
Theos will introduce the seminar and cover design and installation.
Fisher will explain vital elements of the waterproofing system from welding and connection details to sealants.
Attard will describe application of the technique on Foster & Partners' Budenburg residential project at Altrincham, which has a 10,500m basement car park installed in a brownfield site next to a canal.
12.30 Theatre A Cone penetration testing, a brief guide Darren Ward and Rob Gardiner, Lankelma CPT A comprehensive and concise insight into cone penetration testing of soils.
The presenters will outline the history of CPT, describe the variety of probes available, examine testing methods, look at the data generated and its interpretation and explain the derived parameters and calculation methods resulting from cone penetration tests.
13.30 Theatre A New engineering ideas merit fresh business methods Peter Dunn, Mini Soil Surveys Engineers find ingenious solutions to engineering problems but frequently fail to develop those ideas into profitable business. Dunn was a consulting engineer who became managing director and joint owner of Mini Soil Surveys. He is also chairman of Screwfast Foundations.
Both organisations have the benefit of patents relating to their ideas. Dunn will reveal and demonstrate the latest patent from Screwfast for the first time at Civils 2004. This is likely to become a product with widespread engineering applications. A royalty method of trading may be used to market it.
13.45 Theatre B Geotechnical data management Dr Roger Chandler, Key Systems Geotechnical The geotechnician's field notebook of the 21st century is totally electronic. Its use from holeside borehole logging right through to the creation of electronic reports and drawings will be explored and described in detail by Dr Chandler's seminar. He will cover electronic data transfer; the AGS (Association of Geotechnical & Geoenvironmental Specialists) Interchange format, and how it can save companies time and money; and the digital ground modelling of geotechnical and geoenvironmental data.