Influences of Aggregate Micro Fines on the Performances of Mortar and Its Mechanisms

Author(s): Wang Yuli, Ma Yuxiang
Paper category: Proceedings
Book title: 1st International Conference on UHPC Materials and Structures
Editor(s): Caijun Shi and Dehui Wang
ISBN: 978-2-35158-164-3
e-ISBN: 978-2-35158-165-O
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 55-63
Total Pages: 9
Language: English

Abstract: The effects of aggregate micro fines (AMF) contents on the strength, early shrinkage and pore structure of mortar, which is mixed with limestone manufactured fine sand (MFA) at a water-to-cement ratio of 0.50, were comparatively studied. The experimental results show that the strength and early shrinkage are better when the AMF content is between 10% and 15%, and the optimal content is 15%. The variation regularity of the pore structure is the same. To explain the physical filling effect of AMF in mortar, the concept of free water in fresh mortar was defined, and the calculation formula of the amount of free water in fresh mortar mixture was obtained through combining the establishment of model with the test of wet pack density. The amount of free water was obtained with this formula, and the variation regularity of the amount of free water with AMF agrees with those of AMF on the performances of mortar, which shows that the influences of limestone AMF on performances of mortar are caused by its physical filling effect.

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