9 research outputs found
Effect of metallic aggregate and cement content on abrasion resistance behaviour of concrete
Many concrete structures are required to have sufficient abrasion
resistance, such as dams, canals, roads and floors. The abrasion
resistance of concrete may be defined as its ability to resist being
worn away by rubbing. Compressive strength and aggregate type are also
important factors affecting the abrasive behaviour of concrete. However,
very little information on the properties of haematite containing
concrete has been reported. The authors report on the abrasion
resistance of concrete with four different cement contents (300, 350,
400 and 450 kg m(-3)) and with haematite as a metallic aggregate with
replacement ratios of 15, 30, 45 and 60\% under 5, 10 and 15 kg loads.
The water/cement ratio was kept constant at 0.40 to evaluate the effects
of haematite and cement content. Slump tests were conducted to evaluate
the workability of fresh concretes. For hardened concrete samples,
mechanical tests such as compressive strength, splitting tensile
strength, unit weight and wear resistance were performed. Along with the
physical and mechanical properties of concretes, haematite was studied
as a mineral. Increasing both cement and haematite content has
substantial effects on the strength of the concrete. Polarising
microscopy views of the interfaces show that haematite aggregates
exhibit greatly improved bond strength. Wear loss of concrete decreases
with increasing concentration of haematite, while it increases with
increasing cement content. An equation representing wear as a function
of cement content, compressive strength and also applied load provides
virtually perfect agreement with the experimental results