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Ultra high performance concrete (UHPC) with low silica fume contents and limestone aggregates

Author(s): Guillermo Hernández-Carrillo, Alejandro Durán-Herrera, Pedro L. Valdez-Tamez
Paper category: Proceedings
Book title: Proceedings of the International RILEM Conference
Materials, Systems and Structures in Civil Engineering 2016
Segment on Concrete with Supplementary Cementitious Materials
Editor(s): Ole M. Jensen, Konstantin Kovler and Nele De Belie
e-ISBN: 978-2-35158-179-7
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 362 - 371
Total Pages: 10
Language : English

Abstract: UHPC it’s the newest iteration of high Performance Concrete, it is characterized with a high compressive strength, a very high durability and high cost. The typical formulations commonly use costly aggregates such as fine powdered quartz and sand of that same material,bauxite, basalt, among others. These formulations typically require very high dosages of silica fume additions (25% in addition by weight of cement (woc)). In this work, UHPC mixes were made with regular limestone sand with a maximum size of 4.75 mm in replacement of the common quartz aggregates (both fine sand and powder). Mixtures contained additions of silica fume between 0 and 25% by woc. At a paste level, thermogravimetric analysis on silica fume/Portland cement and on silica fume/calcium hydroxide systems were performed to evaluate the potential pozzolanic reaction and as another way to determine the silica fume addition to maximize calcium hydroxide consumption. As a result of our experimental work, an UHPC with limestone aggregates was obtained with 5% of silica fume by woc and for a target minimum compressive strength of 150 MPa.

Online publication : 2016
Publication type : full_text
Public price (Euros) : 0.00

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