Based on the experimental study conducted and the
results presented herein, following conclusions can be
drawn
1. Compressive strength of high workability mortars
enhances with the application of slag and superplasticizer
as cement replacement and water reducing
agent respectively. The enhancement ranges between
5% and 15% of control OPC mortars.
2. Compressive strength value as high as about 56MPa is
achieved in case of mortar 1:2 ratio with 50% slag and
0.4% superplasticizer while the lowest value 26MPa is
obtained for mortar 1:3 without slag and superplasticizer.
3. Partial replacement of cement with slag in high
workability mortars be maximized at 50% of total
binder by weight. Further studies should be conducted
to investigate the effect of cement replacement level
with slag below 50% in high workability mortars.
4. Although the compressive strength of high workability
mortars increases with the increase in the superplasticizer
dosage up to 0.5% of total binder by weight
but the increase in strength is marginal with further
increase in superplasticizer beyond 0.2%.
5. Early age strength development of high workability
mortars with slag is slow. This trend is in accordance
with that of the normal workability mortars and
concretes, however with higher dosage of superplasticizer
the early age strength could be insured similar to
that of the OPC mortar.
6. Mortar 1:2 with 50% slag and 0.2% superplasticizer
showed early age strength similar to that of the OPC
mortar at 3 days and gained about 20% of 28-days
strength over OPC mortar at only 90 days.
7. Curing conditions influence the compressive strength
and strength development of high workability mortars.
The mortars cured under wet condition obtained
remarkably higher and consistent strength development
compared to the mortars of same mix proportions
cured under air and natural weather conditions.
8. Almost all the mortars including control OPC mortar
showed low water absorption, but mortar 1:2 with 50%
slag and 0.2% superplasticizer exhibited lowest water
absorption 2.98%, that is about 40% less than that of
control OPC mortar.
9. The results of this research study reveals that a high
workability slag-cement mortar of a wide variety of
strength ranging between 56MPa and 26MPa, depending
upon the mix ratio, replacement level of cement
with slag, dosage of superplasticizer can be developed.
However, mortar 1:2 with 50% slag and 0.1% and
0.2% superplasticizer could be considered as suitable
mortar exhibiting high strength greater than 50MPa
and low water absorption about 3%, for the casting of
thin ferrocement elements by method of pouring.
10. The partial replacement of cement by slag which is
industrial waste not only makes the product cost
effective but provide a potential utilization of the
hazardous waste which is one of the sources causing
environment pollution.
Based on the experimental study conducted and theresults presented herein, following conclusions can bedrawn1. Compressive strength of high workability mortarsenhances with the application of slag and superplasticizeras cement replacement and water reducingagent respectively. The enhancement ranges between5% and 15% of control OPC mortars.2. Compressive strength value as high as about 56MPa isachieved in case of mortar 1:2 ratio with 50% slag and0.4% superplasticizer while the lowest value 26MPa isobtained for mortar 1:3 without slag and superplasticizer.3. Partial replacement of cement with slag in highworkability mortars be maximized at 50% of totalbinder by weight. Further studies should be conductedto investigate the effect of cement replacement levelwith slag below 50% in high workability mortars.4. Although the compressive strength of high workabilitymortars increases with the increase in the superplasticizerdosage up to 0.5% of total binder by weightbut the increase in strength is marginal with furtherincrease in superplasticizer beyond 0.2%.5. Early age strength development of high workabilitymortars with slag is slow. This trend is in accordancewith that of the normal workability mortars andconcretes, however with higher dosage of superplasticizerthe early age strength could be insured similar tothat of the OPC mortar.6. Mortar 1:2 with 50% slag and 0.2% superplasticizershowed early age strength similar to that of the OPCmortar at 3 days and gained about 20% of 28-daysstrength over OPC mortar at only 90 days.7. Curing conditions influence the compressive strengthand strength development of high workability mortars.The mortars cured under wet condition obtainedremarkably higher and consistent strength developmentcompared to the mortars of same mix proportionscured under air and natural weather conditions.8. Almost all the mortars including control OPC mortarshowed low water absorption, but mortar 1:2 with 50%slag and 0.2% superplasticizer exhibited lowest waterabsorption 2.98%, that is about 40% less than that ofcontrol OPC mortar.9. The results of this research study reveals that a highworkability slag-cement mortar of a wide variety ofstrength ranging between 56MPa and 26MPa, dependingupon the mix ratio, replacement level of cementwith slag, dosage of superplasticizer can be developed.However, mortar 1:2 with 50% slag and 0.1% and0.2% superplasticizer could be considered as suitablemortar exhibiting high strength greater than 50MPaand low water absorption about 3%, for the casting ofthin ferrocement elements by method of pouring.10. The partial replacement of cement by slag which isindustrial waste not only makes the product costeffective but provide a potential utilization of thehazardous waste which is one of the sources causingenvironment pollution.
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