The incorporation of construction and demolition wastes as recycled mixed aggregates in non-structural concrete precast pieces

Concern for the environment has lately heightened awareness about the need for recycling in the construction industry. However, some standards, such as the Spanish standard, only accept the recycling of aggregates derived from concrete, which limits the extensive use of construction and demolition waste, which are produced in much bigger volumes. The aim of this work was to explore the possibility of using recycled mixed aggregates (RMA) in the preparation of precast non-structural concretes. To that end different percentages of natural aggregate were replaced by RMA in non-structural elements (25, 50, 75 and 100%). Contents of cement, water, and the dosages commonly used by companies were unchanged by the introduction of RMA. The characterization of the prepared elements has been done using the specific tests for each type of non-structural element (terrazzo for indoor use, hollow tiles, kerbstones and paving blocks): compression and flexural strength, water absorption, dimensional tolerances, abrasion and slipping resistance. The paving blocks, kerbstones, and hollow tiles prepared were tested for 360 days. The stability of the tested properties confirmed the possibility of using these wastes on an industrial scale satisfying the standard requirements. However, the surface of terrazzo with RMA is not as good as that prepared with natural aggregate.

Towards a New (European Research) Deal: The Case for Enhanced Fiscal Policy Coordination on Research and Innovation. Bruges European Economic Policy (BEEP) Briefing 20/2008

The paper reviews the evolution of research and innovation in the EU and assesses how current policies and programmes have influenced the development of Europe's research landscape. Based on existing literature, evaluation reports and practice, the paper critically examines the effectiveness of current European research funding instruments in a context of open innovation and in the presence of global spillovers. It therefore develops a subsidiarity test to assess whether current rationales still prove sufficient to justify policy intervention in this area. The paper sheds light on how to improve the effectiveness of EU action by enriching it by the use of coordinated fiscal policy for research funding. This will constitute an incentive to genuine bottom-up research, development and innovation (R&D&I) and a stimulus to local investments in innovation. The paper also assesses the potentials of a reinforced open method of coordination as well as a review of state aid law in the field of research funding in the EU.

Handbook of computer models for traffic operations analysis - technical appendix: summary of models and references.

Federal Highway Administration, Office of Research and Development, Washington, D.C.

Effective treatments of over and undercrossings for use by bicyclists, pedestrians and the handicapped. Final report.

Federal Highway Administration, Office of Research and Development, Washington, D.C.

An assessment of ozone and chlorine dioxide technologies for treatment of municipal water supplies /

Mode of access: Internet.

Critical review of estimating benefits of air and water pollution control /

Contract no. 68-01-2821.

Stabilization/solidification of CERCLA and RCRA wastes : physical tests, chemical testing procedures, technology screening, and field activities.

"May 1989."

Toxicity of pulp and paper mill effluent : a literature review /

Mode of access: Internet.

Evaluation of operation and maintenance factors limiting municipal wastewater treatment plant performance /

Mode of access: Internet.

Estimating costs for water treatment as a function of size and treatment efficiency /

Mode of access: Internet.

Chemical shoreline cleaning agents for oil spills : update state-of-the-art on mechanisms of action and factors influencing performance /

"EPA contract no. 68-C8-0062, Work assignment no. 3-48, SAIC project no. 01-0895-03-1000."

Source assessment : transport of sand and gravel /

Mode of access: Internet.

Basics of pump-and-treat ground-water remediation technology /

Mode of access: Internet.

Demonstration of ultrafiltration and carbon adsorption for treatment of industrial laundering wastewater /

Mode of access: Internet.

Assessment of bacteria and virus emissions at a refuse derived fuel plant and other waste handling facilities /

Mode of access: Internet.