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 Professor Shashank Bishnoi 2 Name Entry No Ahmad Shah Kakar 2017CET2532 Part One 1.
Objective Theobjective of this experiment was to use the Marsh flow cone test to study therheological properties of cement and mortar. The main focus was to preparecement mortar with different percentages of admixture and investigate the flowof cement. Overall, the test was performed to determine the effect ofsuperplasticizer on concrete and to measure the viscosity of mortar byobserving the time required for a specific volume of mortar to flow through thecone. 2. ApparatusThe equipment and apparatus needed for this experiment are listedbelow:1. Marshcone2.
Mechanicalmixer3. Stopwatch4. Beaker 3. ProcedureFirst ofall 0.3 water/cement ratio mortar is prepared with 2 kg of cement and 600 gramsof water.
Next, 0.2% of the superplasticizer admixture is added. In next stepthe mechanical mixer was used to prepare the mortar. And finally, pour themortar into Marsh cone and record the time for mortar to reach the 100 mm markon the beaker. The same procedure in repeated by increasing the percentage ofsuperplasticizer to 0.4%, 0.6%, 0.8% and 0.
5% respectively for each of thefollowing 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· Usinggloves and mask are compulsory for performing these experiments· Theamount of admixture should be added to the mix very precisely 5. ResultsTime recorded and the amount of admixture was noted for each trialand 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. AnalysisIt was revealed that when 0.2% admixture was added the timerequired 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 was20.71 and 20.17 respectively. And finally 20 seconds was noted for 0.
5% ofadmixture which was recorded as the optimum amount of superplasticizer.8. ConclusionBy observing the results obtained from various trials it wasrevealed that the time required for mortar to reach the 100 mm level of beakervaries with the dose of superplasticizer admixture added to the mix. Moreover itwas revealed that beyond a certain amount the time either increases again or keepsconstant, the amount of superplasticizer at that point of time is called the optimumamount. For case of our experiment that amount was 0.5 %. Part two Objective The objectiveof this experiment was to determine the solid (ash) content in superplasticizeradmixture as per IS 9103. 2.
ApparatusThe equipment and apparatus needed for this experiment are listedbelow:1. Balance2. Mufflefurnace3. Previouslyignited porcelain crucible dimensions: 50mm diameter, 32mm high4.
oven 3. ProcedureFirst ofall using the balance we find the weight of crucible and note it. Next pour therequired amount of superplasticizer admixture which in our case was 10 gramsand again record the weight sample and crucible together. The same procedure isfollowed for one more sample. And finally put the sample in muffle furnace at600 °C for up to 24hrs and then take them out of furnace and reweigh thecrucibles with samples. Last, find the ash content for in each crucible andfind the average of the two.