Laboratory investigation of carbonated BOF slag used as partial replacement of natural aggregate in cement mortars

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• 作者：Marius Bodor^a ; ^b ; ^{bodormarius@yahoo.com" class="auth_mail" title="E-mail the corresponding author} ; Rafael M. Santos^a ; ^c ; ^{rafael.santos@alumni.utoronto.ca" class="auth_mail" title="E-mail the corresponding author} ; Geanina Cristea^b ; Muhammad Salman^d ; Ö ; zlem Cizer^d ; Remus I. Iacobescu^e ; Yi Wai Chiang^f ; Koenraad van Balen^d ; Maria Vlad^b ; Tom van Gerven^a ; ^{tom.vangerven@cit.kuleuven.be" class="auth_mail" title="E-mail the corresponding author}
• 关键词：BOF slag ; Mineral carbonation ; Fine aggregate ; Cement mortar ; Soundness ; Leaching
• 刊名：Cement and Concrete Composites
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：65
• 期：Complete
• 页码：55-66
• 全文大小：2943 K

文摘

Direct mineral carbonation produces a material rich in carbonates and with reduced quantities of free oxides. The aim of this work was to show that such materials can be used in the construction domain. Basic Oxygen Furnace (BOF) slag from the steelmaking process has been traditionally seen as unfit for bounded applications due to its propensity to swelling, resulting from hydration of its high free lime content. Here, BOF slag was crushed to suitable particle sizes, carbonated in an aqueous solution of carbonic acid, and utilized to replace 50% of natural sand aggregate in cement mortars. The mechanical and chemical properties of these mortars were compared to mortars containing non-carbonated slags, and a standard cement mortar as a reference. Tests were conducted to determine mortar paste consistency and soundness, and cured mortar compressive strength and leaching tendencies. The results showed a satisfactory performance for all considered aspects (comparable with the reference) of the mortar sample containing 37.5 wt% (1.5 in 4 parts solids) carbonated BOF slag of <0.5 mm particle size.