In our area, people are discussing the benefits or disadvantages of finishing exterior concrete containing ground granulated blast furnace (GGBF) slag. Above: A selection of the names suggested by Global Slag delegates for use instead of 'slag.' In general, the present method of preparing carbonated artificial steel slag aggregates provides an approach to solve the unsoundness problem of steel slag when used as aggregates in concrete. highest level of scaling resistance. Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete … Copper slag can be used in many applications such as concrete, landfills, Ballasts, bituminous pavements, tiles etc. In English-speaking countries, 'a slag' is a promiscuous woman, whilst to 'slag someone off' is to criticise them in an abusive and insulting manner. For similar reasons, The Corn Refiners Association in the US is currently petitioning the Food and Drugs Administration to allow the 'high-fructose corn syrup' it produces for the pre-packaged foods industry to be labelled 'corn sugar', a more consumer-friendly, natural-sounding description. McCaffrey argues that the slag industry currently gets no credit for optimising and recycling waste products and that a new name could help promote its interests. The American Concrete Institute. Does this matter? These decisions are fraught with difficulty and the costs of getting it wrong can be considerable, both in terms of money and reputation. SCIC #11, Slag Cement and Fly Ash, compares the two materials, explaining that while chemical similarities exist between them, they exert different influences in concrete applications. Research would need to include a number of stakeholder groups to ensure that all key perspectives were represented. 3 2. The 'scrap metal merchant' of my childhood is these days a business engaged in 'metal recycling.' After all, it is in the high-tech, environmentally-responsible business of transforming and recycling materials that would otherwise find their way into landfill sites: material that is versatile and virtually CO2 free. re-branding is common in government and politics too. To many familiar with this definition, it conjures up the image of the unsightly slagheap, scarring the landscape in the industrial hinterlands coal mining and metal refining regions worldwide. The list includes a number of names that are already trademarked and are included to illustrate the thinking of Global Slag delegates. At present there is no international industry association and until one exists it will be difficult for a change of this sort to be effectively coordinated and agreed upon by all the industry's major players. Les cendres volantes et le laitier de haut fourneau peuvent aussi améliorer la malléabilité du mélange de béton et atténuer les éventuels problèmes de réaction alcali-silice. Fly ash and blast furnace slag also increase the workability of concrete mixtures and can be used to mitigate potential alkali aggregate reactivity problems. It often reveals valuable insights not previously considered and can be the inspiration for new and better ideas. Use of SCC overcomes the problem of concrete placement in heavily reinforced sections and it helps to shorten construction period. A good source of information on this question is ACI 233, "Ground Granulated Blast Furnace Slag As a Cementitious Constituent in Concrete." PAST RESEARCHES ON STEEL … The one critical factor to be understood was that the term 'slag' would still be used in the industry, but solely as a term for a molten mass. Slag cement and fly ash are supplementary cementitious materials often included in contemporary concrete mixes. Home; Products; Cases; About Us; Contact Us; problems encountered during production of concrete. Concrete) (ASTM, 1993) set the maximum acceptable expansion in the ASTM C 441 test at 0.02%. The word slag orginates from the medieval German word 'slagge', meaning 'to strike, with reference to the fragments produced by hammering or forging metal' (Chambers Dictionary of Etymology). The adjusted mix now contains ingredients with an increased amount of total surface area. The suggestions took into account the following factors that a new name for 'slag'. However, he is under no illusion that change will be easy. Fly ash and blast furnace slag also increase the workability of concrete mixtures and can be used to mitigate potential alkali aggregate reactivity problems. Re-naming and. Whole industries are also repositioning themselves. In the case of slag, a new name would need to break with the negative associations of the past and re-cast the slag industry in a more positive light, ideally communicating both its high-tech nature and its environmental credentials. The trouble with 'slag' According to the online Oxford English Dictionary, the word 'slag' is a noun, meaning 'stony waste separated from metals during smelting or refining of ore'. Tony Blair famously re-branded the Labour party 'New Labour', to distance it from its high tax, anti-business, pro-union past and its reputation for poor economic management. Among those is steel slag which is produced as a waste material in the steel industry and has a negative impact on environment when disposed. Solidified concrete that is containing slag cement sometimes have the appearance of blue-green or mottled green areas on the surface during the first few days after placement of the concrete is completed. To achieve this goal in concrete pavement, various substitutes were found to be replaced with natural aggregates of concrete. It is the waste product of copper. II. In a word, 'No.' GGBS Concrete GGBS Proportions On its own, ground granulated blast furnace slag (GGBS) hardens very slowly and, for use in concrete, it needs to be activated by combining it with Portland cement. It would need to work internationally, be short, memorable and ownable. What a difference one word can make! CORROSION OF EMBEDDED METALS Fig. Who is right? Should not have any negative connotations. © 2020 Pro Global Media Ltd. All rights reserved. Independent operating combined mobile crushing station . Governments often change the name of ministries too, to reflect changing priorities and to help them chime better with public sentiment. Moreover the recycling of industrial waste slag is the core content of sustainable development. In the 1990s, UK polytechnics, higher education establishments of lower status than the traditional universities, were permitted to call themselves universities. The change in the bleeding is not due to particle size, but adjustments in the mix design due to the difference in specific gravity of the mix's cementitious material. As soon as molten 'slag' is modified in any way (including its composition, mineralogy and cooling history), it would cease to be 'slag' and would become a product (after all, any intervention costs something). concrete slabs also results in flexural crack formation and possi-ble failure. This causes an expansive reaction and resulting deterioration of the concrete structure. 'Metarock' and 'Cocem' are already out there in the real world, but could potentially be trademarked or used by the slag-products industry. The use of slag cement with a Type I portland cement can provide equivalence to a Type II … For slag, appendix of 989 (Specification for Ground Granulated Blast-Furnace Slag for Use in Concrete and Mortars) (ASTM, 1993) suggests using either the 0.02% expansion with job materials or a 75% greater reduction in expansion using a high-alkali cement. cement.ca. They are therefore replaced with stage names designed to do the opposite. Despite the smaller numbers of people involved, qualitative research is the most important phase in that it enables a detailed exploration of the background issues and a thorough probing of attitudes toward different names and ideas. There have been many examples in recent years of companies changing their name to re-invent themselves and to promote a more positive image or following merger or de-merger: for example, Kentucky Fried Chicken became KFC (a more positive sounding acronym), Philip Morris became Altria and Anderson Consulting became Accenture. It provides great opportunity to utilize it as an alternative to normally available aggregates (coarse and Fine) and cement. cement.ca. An unwary finisher often can close up the slab's surface too early and cause the surface to scale or delaminate. copper slag concrete is yet to get momentum in our country. They didn't waste any time making the change. Our experts suggest that the change in bleeding is why it's more difficult to accurately judge when to get on the slab for the final finish. PDF | On Sep 15, 2014, Olusola Idowu and others published Enter title Effect of Improper Curing on Concrete Performance | Find, read and cite all the research you need on ResearchGate The producers of the various types of cement should be consulted for the … The loss in weight and compressive strength of concrete with 40% of steel slag and 20% of walnut shell (M3) was lower than control concrete (M1).The 20% walnut shell replaced concrete (M2) have a result slightly higher than conventional concrete (M1). Assuming a consensus could be reached that change was desirable, how would a new name for slag be chosen? Another group suggests that the excess fines in a flatwork surface are more likely due to early or poor finishing techniques than the presence of the slag. Names need to avoid confusion with existing companies and brands (and lawsuits), avoid negative connotations, ideally communicate something positive about the product or service that they are selling and, importantly, be memorable. There are too many vested interests and there is no global slag-industry leadership to change the status quo. Steel slag was used in conventional concrete to improve its mechanical, physical, and chemical properties. So, he says, any surface defects in properly batched and placed exterior concrete are caused by the particle size of the concrete ingredients. Researching alternative names does not guarantee success, but it does improve the odds, which is why large FMCG companies invest so much on such research. The scaling resistance of all grade 120 slag cement concrete was within acceptable limits. A typical combination is 50% GGBS with 50% Portland cement, but percentages of GGBS [4] anywhere between 20 and 80 % are commonly used. Names can reveal ethnic or religious origins that the performer would rather conceal, be difficult for audiences to pronounce, cue undesirable associations (as in the case of Leach) or simply be too ordinary and forgettable. To make the reaction a bit hotter, the ready mix producer can add some extra cement (typically an extra 100 pounds per cubic yard) or can use Type III (high-early strength) cement, which hydrates more rapidly. Keywords: self-compacting concrete; air-cooled blast furnace slag; fracture behaviour; heavy metals leaching; concrete manufacturing 1. cement.ca. According to the online Oxford English Dictionary, the word 'slag' is a noun, meaning 'stony waste separated from metals during smelting or refining of ore'. The most important thing in re-positioning /re-branding exercises is to clarify the objectives upfront. A business engaged in 'metal recycling. ' concrete can be reduced significantly or eliminated by observing following! 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