2. Introduction
• Ternary/Triple blending refers to blending of Ordinary
Portland Cement (OPC) with two supplementary
cementitious material (SCM).
• 3 common SCM used widely in the industries are Fly
Ash (FA), Ground Granulated Blast Furnace Slag
(GGBFS) and Silica Fume (SF)
• This presentation is focusing on the ternary blending of
OPC with GGBFS and FA
• It is not common to find research paper focusing on
ternary mixing of OPC, GGBFS and FA, however; a
successful attempt had been achieved to compare a
few research paper, in terms of performance for this
kind of concrete mixing.
10. Discussion (Compressive Strength)
• According to Neville (2008), strength of cement increases when ratio of
water to cement (w/c) decreases. For concrete, the relation still applies,
although ratio of GGBS and fly ash (FA) plays some important role in terms
of strength of the concrete.
• From source 1, we can conclude that at higher w/c ratio (0.59), ternary
mixtures tends to have lower strength compared to pure portland cement
(PC)
• From source 2, however at lower w/c ratio (0.33), ternary mixture tends to
have better strength gain compared to pure PC, where much better
strength is gained when ratio of GGBS is higher than FA (16% GGBS, 4% FA)
• Highest strength is gained when using w/c ratio of 0.38 (Accordingly to
Neville, 2008), however, there will be a slight drop of strength of ternary
mixture compared to pure PC, given an even ratio of both GGBS and FA in
ternary mixture.
• Hence, it could be theorized that the best strength gained will be ternary
mixture at w/c ratio of 0.38, with ratio of GGBS being higher compared to
FA. In addition, higher amount of PC might contribute to the increase of
strength gained, compared to mixtures that are using less PC in mixtures.
15. Discussion (Split Tensile Strength)
• There is fewer data available for comparison between the mixtures
for split tensile strength (STS), however, the explanation would be
the same with discussion about compressive strength.
• Source 2 are using w/c of 0.33, while source 5 are using w/c of 0.34,
which theoretically leads to a better strength for source 5’s mixture,
but it is not. The are several explanation for this question.
• First, w/c ratio is not much in difference, hence there should be
another reasons why.
• Second, by referring to source 2, higher ratio of GGBS leads to
lower STS, which in source 5, the amount of GGBS is even higher,
which could cause the even lower value of STS.
• Another reason for the result is because the amount of aggregate
used compared to amount of cementitious material (CM) used.
19. Discussion (Chloride Ion Permeability)
• According to Sengul and Tasdemir (2009), to attain a durable concrete mixture
low chloride permeability should be obtained.
• From the graph, it is clearly seen that ternary concrete is much better at
resisting chloride ion, compared to ordinary concrete.
• Even though the rapid chloride ion penetration test (RCPT) value of the PC
concrete is reduced about 70% by lowering the water/cement ratio, the values
for the PC concrete at w/c 0.38 ratio are still 2 times or even higher than those
of the ternary concrete at 0.60 w/c ratio. This result indicates that to reduce
the chloride permeability of portland cement concrete, inclusion of
supplementary cementitious material (SCM) are more effective than reducing
the water/cement ratio.
• The presence of reaction from GGBS and FA creates a denser microstructure,
reducing micro pores and clogging pores which results in lower chloride ion
transport. Also, reducing amount of water, will also reduce the amount of
pores, which responsible for the transport of chloride ion.
21. • From data gathered and analyzed, it can be
concluded that the best combination and ratio
of PC, GGBS and FA is as follow:
– Lower w/c ratio, which apparently best at 0.38
– Moderate ratio of cement, which is around 50 –
80%
• Ratio of GGBS to FA should be equal or higher.
(According to compressive strength data)
• Ratio of GGBS to FA should be higher ( STS, for w/c >
0.38)
• Ratio of GGBS to FA should be lower (STS, for w/c <
0.38)
– Some mixture ratio proposed:
• 80PC16S4F38, 50PC30S20F38