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Pro120-2

CONTROL OF EARLY AGE CRACKING IN EARLY-STRENGTH CONCRETE BASED ON ALKALI-ACTIVATED SLAG CEMENT



Author(s): Pavel Krivenko *, Oleg Petropavlovskiy, Igor Rudenko, Serhii Lakusta
Paper category: Proceedings
Book title: Proceedings of the 2nd International RILEM/COST Conference on Early Age Cracking and Serviceability in Cement-based Materials and Structures Volume 2
Editor(s): Stéphanie Staquet and Dimitrios Aggelis
ISBN: 978-2-35158-200-8
e-ISBN: 978-2-35158-198-8
Publisher: RILEM Publications SARL
Publication year: 2017
Pages: 829-834
Total Pages: 6
Language : English


Abstract: Formation of properties of high performance concretes with good durability, not depending upon cement type used, is connected with a possibility to regulate phase composition of hydration products, pore structure and morphology of cement stone structural units at the early stages of hydration. A specific feature of the alkali-activated cements is the formation of low basic calcium silicate hydrates in a gel-like state. This is a reason of their sensibility to cracking at early ages due to shrinkage. The semi-adiabatic calorimetric method was used to study early structure formation of super quick hardening alkali-activated slag cements made using high modulus sodium silicate hydrate as alkaline component. The alkali-activated slag cements can attain values of the compressive strength  15 MPa after 3 h and up to values  80 MPa at the age of 28 days. Effective types of modifiers have been chosen and tried to control hydration and early age structure formation of a cement stone to provide the lower heat evolution of these cements during hydration and the formation of a highly homogeneous and finely porous structure of the resulted cement matrix. The results of tests showed the enhanced performance properties of fine aggregate concretes based on alkali-activated slag cements.


Online publication : 2017
Publication type : full_text
Public price (Euros) : 0.00


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