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Concrete In Australia : March 2014
18 Concrete in Australia Vol 40 No 1 NEWS New solution makes crack widths almost invisible to the naked eye The Admixture Systems business of BASF’s Construction Chemicals division has announced the launch of a unique crack-reducing admixture technology in North America. MasterLife CRA 007 admixture enhances the aesthetics and long-term durability of concrete by reducing the likelihood that cracking will occur and, if it does, minimises the crack width, according to BASF. The company said the MasterLife admixture will meet ASTM C494, Standard Specification for Chemical Admixtures for Concrete, Type S, Specific Performance Admixtures. This patent-pending technology is a special class of shrinkage-reducing admixture that produces a maximum initial crack width of 175μm (.007 inches) in high-performance, crack- prone (HPCP) concrete mixtures tested in accordance with ASTM C1581 test method. And the minimised crack width is almost invisible to the naked eye. Crack widths this small do not transport water and have the potential to self-heal over time, BASF explained, thus increasing concrete durability by minimising the ingress of chlorides, sulfates and other potentially harmful materials. “Cracking is a major issue for the concrete industry, as it detracts from the aesthetics of concrete, can be a safety hazard, and may compromise durability or structural integrity,” Juan Alfonso Garcia, vice president BASF – Admixture Systems said. PHOTO: CC BY APASCIUTO (HTTP://WWW.FLICKR.COM/PHOTOS/APASCIUTO). concrete consstrructionn iiinnovvationnns: RESEARCH INTO PRACTICE ccoonnncccrrretteee 22001155 / rriileeeem m m 220001155 27th Biennial Conference of the Concrete Institute of Australia in conjunction with 69th RILEM Week 2015 30 August – 2 September Melbourne, Australia 18 - Conf. edit.indd 18 18 - Conf. edit.indd 18 3/02/14 3:20 PM 3/02/14 3:20 PM