Early strength improvement of sustainable shotcrete

Author(s): Lukas G. Briendl, Joachim Juhart, Markus Krüger, Florian Mittermayr, Isabel Galan
Paper category: Proceedings
Book title: Proceedings of the International Conference on Sustainable Materials, Systems and Structures (SMSS2019) New Generation of Construction Materials
Editor(s): Marijana Serdar, Nina Štirmer, John Provis
ISBN: 978-2-35158-217-6,
Vol 1. ISBN: 978-2-35158-223-7
e-ISBN: 978-2-35158-218-3
Publisher: RILEM Publications SARL
Publication year: 2019
Pages: 440-447
Total Pages: 8
Language : English

Abstract: Sprayed concrete formulations commonly used in practice have a high content of ordinary Portland Cement (OPC) and consequently high global warming potential and primary energy demand. The substitution of OPC by pozzolanic and/or inert filler materials can significantly improve eco-friendliness of shotcrete; however, this should not compromise the early strength development. The outlined contribution focuses on the effects of micro- fillers (MF), with average particle sizes ≤ 1/10-1/3 from d50 of OPC ́s (≈10μm) [1], on the hydration and early strength evolution of sprayed concrete mixes. OPC systems accelerated by means of alkali- free, aluminum- sulfate based setting accelerators were analysed by: Isothermal calorimetry, X-ray diffraction, determination of the specific surface area (SSA) and standard compressive strength tests according to EN-196-1. The results show a strong influence on the early strength development, hydrations characteristics and –products due to the addition of UF limestone powders.

Online publication : 2019
Publication type : full_text
Public price (Euros) : 0.00