The increasing demand for low and zero carbon buildings in the UK has provided significant challenges for the energy intensive materials we currently rely on. At present somewhere between 20% and as much as 60% of the carbon footprint of new buildings is attributable to the materials used in construction; this is predicted to rise to over 95% by 2020. If the UK is to meet agreed 80% carbon reduction targets by 2050 it is clear that significant reductions in the embodied carbon of construction materials is required. What also seems clear is that current materials and systems are not capable of delivering these savings. The drive for an 80% reduction in carbon emissions, a decreasing reliance on non-renewal resources and for greater resource efficiency, requires step changes in attitude and approach as well as materials. Improvement in construction systems, capable of providing consistently enhanced levels of performance at a reasonable cost is required. Modern developments in construction materials include: eco-cements and concretes (low carbon binders); various bio-based materials including engineered timber, hemp-lime and insulation products; straw based products; high strength bio-composites; unfired clay products utilising organic stabilisers; environmentally responsive cladding materials; self healing materials; smart materials and proactive monitoring; hygrothermal and phase change materials; coatings for infection control; ultra thin thermally efficient coatings (using nano fillers); ultra high performance concretes; greater use of wastes; and, fibre reinforcement of soils. However, very few of these innovations make the break through to widespread mainstream use and even fewer offer the necessary step change in carbon reductions required A low carbon approach also requires novel solutions to address: whole life costing; end of life (disassembly and reuse); greater use of prefabrication; better life predictions and longer design life; lower waste; improved quality; planned renewal; and greater automation in the construction process. As well as performance, risk from uncertainty and potentially higher costs other important barriers to innovation include: lack of information/demo projects; changing site practices and opposition from commercial competitors offering potentially cheaper solutions.. A recent EPSRC Review has recognised the need for greater innovation in novel materials and novel uses of materials in the built environment. The vision for our network, LIMES.NET, is to create an international multi-disciplinary community of leading researchers, industrialists, policy makers and other stakeholders who share a common vision for the development and adoption of innovative low impact materials and solutions to deliver a more sustainable built environment in the 21st Century. The scope of LIMES.NET will include: adaptive and durable materials and solutions with significantly reduced embodied carbon and energy, based upon sustainable and appropriate use of resources; solutions for retrofitting applications to reduce performance carbon emissions of existing buildings and to minimise waste; climate change resilient and adaptive materials and technologies for retrofitting and new build applications to provide long term sustainable solutions. In recognition of their current adverse impacts and potential for future beneficial impacts, LIMES.NET will focus on bringing together experts to develop pathways to solutions using: renewable (timber and other plant based) construction materials; low-impact geo-based structural materials; cement and concrete based materials; innovative nano-materials and fibre reinforced composites. Through workshops and international visits the network will create a roadmap for multidisciplinary research and development pathways that will lead to high quality large research proposals, and an on-going virtual on-line centre of excellence.

There are substantial commercial pressures driving the current trend in reinforced concrete multi-storey structures towards longer spans and thinner structural depths. The potential benefits of clear open spaces, the freedom of placing services and the reduction of building height (and the subsequent potential reduction in cladding costs) or conversely, the ability to incorporate an extra floor in the building (thus increasing rental potential) can have a significant effect on the overall economics of a scheme. However, these benefits cannot be fully exploited until it is possible to predict accurately the long-term deflection of concrete elements.A major problem in predicting the long-term deflection of cracked concrete flexural elements has always been the difficulty in isolating the deformation due to shrinkage from the effect of other parameters such as creep and tension stiffening. Current codes predict the long-term deflection of cracked concrete elements by using the approach developed for uncracked sections but incorporating cracked section properties. Whilst there is no question of the correctness of this in relation to uncracked sections, it has never been experimentally validated for cracked sections. Consequently, it may be extremely conservative and, therefore, have a restrictive influence on design strategy. The effect of shrinkage on a cracked section remains uncertain as it has not been possible to confirm the influence experimentally. The applicants now believe it is possible to overcome this difficulty and this application proposes an extremely innovative experimental approach which will allow the effect of shrinkage on the deformation of cracked members to be isolated for the first time. Recently, research by the applicants under a previous EPSRC funded project has resulted in a much better understanding of the tension stiffening phenomenon and, in particular, its decay with time. The effects of creep are already generally well understood. The results of the proposed research, and the data obtained by the Leeds and Durham concrete research team on tension stiffening, will finally allow designers to predict the long-term deflection of cracked concrete flexural elements with greater reliability.The current climate within the construction industry and the effect this has had on the cost and availability of steel is leading, and will continue to lead, to an increased use of concrete in construction (e.g. the major new Clarence Docks development in Leeds, where previously steel would have been chosen). The research is, therefore, very timely. It is now even more critical that this information is available to designers to ensure that maximum efficiency in the design and use of concrete is achieved so as not to restrict their competitiveness within the UK and EU construction industry.The proposed research will be performed at both the University of Leeds and the University of Durham. The experimental programme consists of two stages. The initial stage is concerned with confirmation of methodology. The second stage will isolate the effect of shrinkage using the innovative approach proposed by the investigators, contributing to an improved design method and more accurate assessment of shrinkage. The proposal has 6 industrial collaborators providing in-kind and cash contributions totalling 33,460. The total amount of funding being sought by the two universities is 274,537.

The economic and social well-being of society is dependent on the efficient performance of the nation's infrastructure which encompasses transport networks (roads, bridges, railways, tunnels, airports and canals), the energy sector (power stations, electricity and gas distribution networks), water supply and waste treatment facilities, buildings and also digital communications networks (telephone and internet). Much of this infrastructure is in a serious state of disrepair or reaching the end of its economic life (e.g. the first generation nuclear power stations) and governments have recognised the need for substantial investment to regenerate and expand the existing infrastructure as well as build new infrastructure to meet the challenges posed by increasing population and climate change. In addition to these requirements, a recent Infrastructure UK report suggests that the construction industry in the UK is less efficient and significantly more expensive than counterparts on the continent and overseas. It highlighted the need for a radical rethink of the entire industry which is often characterised as being 'old and slow' as opposed to the 'new and fast' technology sectors such as the aerospace and automobile industries. The fragmented nature of the overall supply chain, and the length of innovation cycle (20 years or more) have historically made industry transformation difficult to deliver. The industry also creates significant waste. Out of 420m tonnes of material consumed in the UK each year, an estimated 20% is thrown away. In 2008 the then Labour government set a series of challenging targets to improve sustainability in the construction sector. These include: (a) improve design; (b) promote innovation sustainability; (c) improve procurement and adopt whole life cycle principles; (d) increase training and reduce accidents; (e) achieve 50% reduction in construction waste to landfill by 2012; (f) reduce UK greenhouse gas emissions by at least 80% by 2050 and at least 34% by 2020 and (g) conserve water and enhance biodiversity on construction sites. Although some of these targets may be modified by the new government, it is likely that many will still be enforced and there remains a firm commitment to sustainable construction. On top of these targets, there is growing recognition that our infrastructure needs to be more resilient to the extremes of weather (such as floods and snow in the UK and hurricanes in Australia), and to the loads imposed by natural hazards such as earthquakes and tsunamis, as well as man-made events such as terrorist bombs and fires. All of these drivers serve to emphasise the importance of finding a mechanism to promote and implement the changes required. A 'business as usual' approach cannot be continued if these targets are to be achieved. The mission of the proposed Future Infrastructure Forum (FIF) is to generate a new vision of the shape of tomorrow's construction industry by providing a roadmap of research priorities in the ground and structural engineering sectors which will lead to firm proposals for innovative research aimed at revolutionizing how we procure, design and deliver major infrastructure projects. A key feature of this Forum is its broad membership which includes academics from over 20 of the top research Universities in the UK plus representatives from major consultants, contractors and industry and client organisations. In addition, a panel of experts from key international markets will be invited to participate and highlight the state-of-the-art and recent innovations across the globe. A core function will be to identify specific areas of focus and research projects which could be instigated immediately to precipitate this transformation. It will promote a total rethink of the fundamental approach to design, challenge established norms and stimulate innovation in construction.