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Fine Aggregates Size Effect on Rheological Behavior of Mortar

잔골재 입자 크기에 따른 모르타르의 레올로지 거동 특성

Lee, Jin Hyun;Kim, Jae Hong;Kim, Myeong Kyu
이진현;김재홍;김명규

  • Received : 2015.05.13
  • Accepted : 2015.08.06
  • Published : 2015.08.31

Abstract

Physical characteristics of aggregates affect the workability and strength of mortar and concrete, which include their fineness ratio, particle size distribution and water absorption. The workability of construction materials decreases if the incorporated fine aggregates show improper size distribution of their particles. This study shows the particle size effect on the rheological behavior of mortar and provides basic information for evaluating its workability. A mini-slump flow test was adopted to evaluate the workability of mortar. In addition, its plastic viscosity and yield stress were measured using a rheometer for building materials. The sand samples were prepared by sieving river sand and sorting out with their particle sizes. As a result, it was observed that the fines less than 0.7 mm increases the yield stress and plastic viscosity of the mortar samples. If the fines are less than 0.34 mm, the water absorption of the fines dominates change on the workability.

Keywords

Aggregate;Concrete;Mortar;Particle Size;Rheology

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Acknowledgement

Supported by : 경남과학기술대학교