Concrete Products

SEP 2018

Concrete Products covers the issues that attract producers of ready mixed and manufactured concrete focusing on equipment and material technology, market development and management topics.

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18 • September 2018 www.concreteproducts.com NEWS SCOPE ORGANIZATIONS A new white paper shows how petrographic examination identifies the root cause of common deficiencies and degradation mechanisms in hardened concrete, from low compressive strength, surface scaling or spalling to cracking and alkali-aggregate or chemical reactions. Available free of charge, "The Concreting Process and Petrographic Examination," is primarily for cast-in-place concrete but offers con- tent applicable to precast as well, and suits engineers, architects, contractors, producers, agencies and building owners. The petrographic process begins with a detailed visual exam- ination of a concrete specimen, followed by surface or chemical analyses and microscopy. Among features or points technicians note: aggregates, cement paste matrix, crack surfaces, air void distribution and filling, plus embedded reinforcement. Petrographic analysis can yield entrained air content and water/cement ratio figures, plus insight on the condition of existing concrete, including crack types and cracking mechanisms. "Our timely petrographic examinations provide clients with in-depth, detailed reports focused on the specific attributes in ques- tion," says Lucideon Special Projects Leader and paper author Dale Purvis. Staff can answer a host of questions on a concrete specimen, he adds, "from has it cured correctly, to establishing the geological provenance of the stone, to examining [reinforcement] corrosion. Ultimately, petrographic analysis can help confirm whether the defects will affect the concrete performance or if they are just sur- face flaws." With a North American headquarters in Raleigh, N.C., Lucideon provides petrographic analysis of concrete, mortars, building stone and other geological materials to understand their mineralogy and evaluate slab or structure integrity. Staff perform tests described in ASTM C295 Standard Guide for Petrographic Examination of Aggregates for Concrete; C856-18 Standard Practice for Petrographic Examination of Hardened Concrete; and, C457/C457M-16 Standard Test Method for Microscopical Determination of Parameters of the Air-Void System in Hardened Concrete. Petrographers offer quick study on pinpointing slab, structure defects GLOBAL GROUPS ALIGN TO PROMOTE CEMENT, CONCRETE SUSTAINABILITY A strategic partnership between the recently chartered Global Cement and Concrete Association (GCCA), London, and World Business Council for Sustainable Development (WBCSD), Geneva, is intended to facilitate sustainable development of the cement and concrete sectors and their value chains, while creating work program synergies benefitting both organizations' members. Work from the WBCSD-hosted Cement Sustain- ability Initiative (CSI) will be transferred to WCCA in 2019. "The GCCA and WBCSD are natural partners. This long-term agree- ment formalizes our relationship, enabling the two organizations to work together efficiently on our many common objectives and areas of interest," says GCCA President and CRH Plc CEO Albert Manifold. "Transferring the activities of the CSI to GCCA is a logical step and further underlines the cement and concrete sector's commitment to advance sustainable development across the construction cycle. As the authoritative worldwide voice of cement and concrete, the GCCA is ideally placed to take this work to the next level, building on the strong foundations established by WBCSD." Established in 1999 and now representing 24 major cement pro- ducers, the CSI focuses on understanding, measuring, managing and minimizing the impacts of cement production and use by addressing climate change, energy consumption, employee health and safety, air- borne emissions, concrete recycling and quarry management.

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