INDIAN record the time for mortar to reach the

 
INDIAN
INSTITUTE OF TECHNOLOGY-DELHI
CIVIL
ENGINEERING DEPARTMENT
CONSTRUCTION
ENGINEERING & MANAGEMENT
Construction
Technology Laboratory
Course code: CVP 771

 

 
Marsh Flow Cone
Solid Content
Chloride Content
Compressive Strength
 
 
 

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                                  Professor
Shashank Bishnoi

 

2

                                  

 

 

Name                                             
Entry No
Ahmad
Shah Kakar                       
2017CET2532
 

                                                                                     

Part One

 

1. Objective                 

The
objective of this experiment was to use the Marsh flow cone test to study the
rheological properties of cement and mortar. The main focus was to prepare
cement mortar with different percentages of admixture and investigate the flow
of cement. Overall, the test was performed to determine the effect of
superplasticizer on concrete and to measure the viscosity of mortar by
observing the time required for a specific volume of mortar to flow through the
cone.

 

2. Apparatus

The equipment and apparatus needed for this experiment are listed
below:

1.    
Marsh
cone

2.    
Mechanical
mixer

3.    
Stop
watch

4.    
Beaker

 

3. Procedure

First of
all 0.3 water/cement ratio mortar is prepared with 2 kg of cement and 600 grams
of water. Next, 0.2% of the superplasticizer admixture is added. In next step
the mechanical mixer was used to prepare the mortar. And finally, pour the
mortar into Marsh cone and record the time for mortar to reach the 100 mm mark
on the beaker. The same procedure in repeated by increasing the percentage of
superplasticizer to 0.4%, 0.6%, 0.8% and 0.5% respectively for each of the
following stages. The procedure is summarized in below figures and photos:

 

Figure 1: Preparing mortar

 

 

Figure 2: Adding admixture

 

 

 

 

 

 

 

 

Figure 3: Preparing mortar using the mechanical mixer

 

 

 

 

 

 

 

 

 

 

Figure 4: Recording time

 

 

 

 

 

 

 

 

4. Precautions

·       
Using
gloves and mask are compulsory for performing these experiments

·       
The
amount of admixture should be added to the mix very precisely

 

5. Results

Time recorded and the amount of admixture was noted for each trial
and the results are summarized in the following table:

 

Table 1: Admixture content vs time

Time in Seconds
(X Axis)

Infinite

27.6

20.71

20.17

20

Admixture %
(Y Axis)

0.2

0.4

0.5

0.6

0.8

 

 

 

 

 

 

 

 

 

 

 

 

Fig 1:
Admixture content vs time

 

7. Analysis

It was revealed that when 0.2% admixture was added the time
required for mortar to reach the 100 mm level of beaker was infinite. For 0.4%
of admixture the time recorded was 27.6 seconds, for 0.6% and 0.8% the time was
20.71 and 20.17 respectively. And finally 20 seconds was noted for 0.5% of
admixture which was recorded as the optimum amount of superplasticizer.

8. Conclusion

By observing the results obtained from various trials it was
revealed that the time required for mortar to reach the 100 mm level of beaker
varies with the dose of superplasticizer admixture added to the mix. Moreover it
was revealed that beyond a certain amount the time either increases again or keeps
constant, the amount of superplasticizer at that point of time is called the optimum
amount. For case of our experiment that amount was 0.5 %.

 

Part two

 

Objective                     

The objective
of this experiment was to determine the solid (ash) content in superplasticizer
admixture as per IS 9103.

 

2. Apparatus

The equipment and apparatus needed for this experiment are listed
below:

1.    
Balance

2.    
Muffle
furnace

3.    
Previously
ignited porcelain crucible dimensions: 50mm diameter, 32mm high

4.    
oven

 

3. Procedure

First of
all using the balance we find the weight of crucible and note it. Next pour the
required amount of superplasticizer admixture which in our case was 10 grams
and again record the weight sample and crucible together. The same procedure is
followed for one more sample. And finally put the sample in muffle furnace at
600 °C for up to 24hrs and then take them out of furnace and reweigh the
crucibles with samples. Last, find the ash content for in each crucible and
find the average of the two.