Published on September 21, 2014
MARSH CONE TEST BY BY: AKSHAY R MANOHAR 1 sem MTech(Construction Technology) CIVIL ENGINEERING DEPT. NMAMIT-NITTE.
• Marsh cone
Marsh Cone Test • Marsh cone test is reliable and simple method to study the rheological properties of cements and mortars. • Flow time of cement/mortar through marsh cone is indicator of viscosity, which depends upon cement super plasticizer compatibility. • It is widely used to study cement super plasticizer compatibility and to determine optimum super plasticizer dosage of a specific cement-super plasticizer combination.
Apparatus • It’s consist of a conical brass vessel held on a wooden stand with an orifice of 8mm at its bottom. • A stop watch is needed to measure the time taken by 1 litre of cement or mortar to pass through the vessel. • A mortar mixer is also needed to prepare the cement paste with desired w/c ratio.
PROCEDURE • 1L of cement paste is prepared in mortar mixer using 2 kg of cement and w/c ratio of 0.32-0.35.High strength Concrete designs typically have w/c ratios less than 0.35. • Water is added in two steps- 70% of water is added in beginning of mixing and rest 30% of water is mixed with super plasticizer, and added afterwards. • Cement slurry is prepared with the w/c ratio of 0.32 and admixture dosage of 0.5 %. • 1 litre of cement slurry is made to flow through marsh cone after 5 min and 60 min of mixing and time in seconds is measured using a stopwatch. • The procedure is repeated gradually increasing the S.P. Dosage in steps of 0.2%. • Similar tests are conducted for rest of super plasticizers and graphs are plotted with time as Y axis and S.P. dosage as X-axis.
TYPICAL MECHNICAL MIXER MECHANICAL MIXER
The saturation dosage of super plasticizer can be defined as that point beyond which there is no significant decrease in the flow time.
Variable parameters • W/c ratio • Temperature(5-45 ‘C) • Admixtures (super plasticizer, retarder, accelerator, Air-entraining admixtures, new generation super plasticizer.)
Figure 2 shows plots of the flow time at 5 and 60 min, for super plasticizer dosages ranging from 0.4% to 2.0% of the mass of the cement.
EFFECT OF TEMPERATURE ON THE FLUIDITY OF SUPER PLASTICIZED CEMENT PASTE Polycarboxylate Derivatives (PCE based) Sulfonated naphthalene-formaldehyde condensates (SNF)
Significance • The saturation dosage of super plasticizer can be defined as that point beyond which there is no significant decrease in the flow time. • Saturation point can be taken as the maximum super plasticizer content to be used in concrete. • We can implement to use specially recommended admixtures at recommended dosages for given mix design.
ADMIXTURES • SUPER PLASTICIZER • RETARDER • ACCELERATOR • AIR-ENTRAINING ADMIXTURES • For the above all admixtures marsh cone test can be adopted.
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