physical properties of concrete to suit different construction requirements. Concrete admixtures
in form of chemicals at controlled quantities affect these alterations. This work investigated the
effect of Conplast SP561 on concrete properties. Six mix proportions of water and Conplast
SP561 which include 0.45-0, 0.445-0.005, 0.44-0.01, 0.435-0.015, 0.43-0.02 and 0.425-0.025 were
used on 1:2:4 standard mix of concrete at a constant w/c ratio of 0.45. That is, 0%, 1.11%, 2.22%,
3.33%, 4.44%, and 5.55% replacement ratios of water with Conplast sp561 made up the six mix
proportions. The fresh concrete was tested for workability and setting time (initial and final)
while the hardened concrete cubes were tested for compressive strength and water absorption
properties. Each of the six mix proportions had a curing age of 28 days having milestone ages
of 7, 14, and 21 days using no percentage replacement of water as the control specimen.
Workability exhibited a true slump in four out of the 6 mix proportions, while the last two mixes
exhibited a collapse. The setting time and water absorption increased with an increase in the
quantity of Conplast SP561 in the mix with their highest values at 822 minutes and 10.43%
respectively. Compressive strength increased with an increase in the quantity of SP hitting
28.8N/mm2 as the highest value. Conplast SP561 can be satisfactorily used in the construction
industry as a good superplasticizer.
Keywords: Conplast, SP561 and concrete properties
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Bethel Chijioke Iheanacho, Abiaziem Victor Njoku, Kelechi Frank Anyoha, Ignatius Chigozie Onyechere (2023).The Effects of Conplast Sp561 on Concrete Properties. INOSR Applied Sciences 10(1):66-77.