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Research Papers

What is Efflorescence in Bricks and Concrete?

Paper of Efflorescence in Bricks and Efflorescence and Leaching in Concrete by Sir. Kaushal Kishore
Materials Engineer, Roorkee

Efflorescence is the usual terms for deposit of soluble salts, formed in or near the surface of a porous material, as a result of evaporation of water in which they have been dissolved.

Usually sulphate of magnesium, calcium, sulphate and carbonate (and sometimes chloride and nitrates) of sodium and potassium are found in efflorescence. These salts may be traced to the brick itself, sand used in construction, the foundation soil, ground water, water used in the construction and loose earth left over in contact with brick work. Bricks with magnesium sulphate content higher than 0.05 percent should not be used in construction. Soluble salt content in sand (chloride and sulphate together) should not exceed 0.1 percent.

Experimental Study On The Ductile Characteristics Of Hybrid Ferrocement Slabs

Research Paper by
A.Dhasarathan1, Dr. R. Thenmozhi2, Mrs. S. Deepa Shree 3
1 PG Scholar, Government College of Technology, Coimbatore
2Associate Professor, Government College of Technology, Coimbatore
3 Assistant Professor, Jansons Institute of Technology, Coimbatore

Ferro cement elements are generally more ductile when compared to conventional reinforced concrete elements but post peak portion of load- deflection curve in bending test of Ferro cement elements reveals that failure occur either due to mortar failure in compression or due to failure of extreme layers of mesh. In this paper a study has been made on the ductility behaviour of hybrid Ferro cement elements by strengthening it in its tension zone by using GFRP layers and by adding polypropylene fibers into concrete. In present study, slab specimens of each 700 mm X 300 mm with varying parameters such as number of layers of mesh (2 & 3 bundled), layers of GFRP sheets (0 & 1) along with and without a specified proportion (0.30%) of polypropylene fibers were cast. Two point loading test was conducted on slabs and parameters such as ultimate moment capacity, ductility ratio and crack pattern were observed. From experimental results it was found that wrapping of GFRP in tension zone of slab increases confinement of bottom zone and using of fibre reinforced concrete has an influence on ductility and flexural capacities of ferrocement slabs.

Keywords: ferrocement slabs, GFRP wrapping, fibre reinforcement, ductility factors

Behavioural Studies On Hollow Double Skinned Steel Concrete Composite Columns

Research Paper by N.Balasubramanian,R.B.Karthika and Dr.R.Thenmozhi
Government College Of Technology, Coimbatore-641 013, India

This paper comprises of the experimental study of eight double skinned concrete filled steel tubular (DSCFT ) beam columns of concentrically placed circular sections filled with self compacting concrete. Tests on the specimens were made by applying eccentric loads. The main experimental parameters for beam-columns were slenderness ratio and load eccentricity. Testing of specimens investigates the behaviour on load deflection, confinement effect, and the strength of the columns. The experimental observations were shown by load-deflection curves. Various characteristics such as strength, stiffness, ductility and failure mode are discussed. The predicted load versus deformation relationships are in good agreement with beam-column test results. The DSCFT columns in-filled with SCC show good strength and ductility. Modified equations are suggested to find the ultimate compressive strength of DSCFT columns filled with SCC.

Keywords : Composite; Double skinned concrete filled steel tubular columns; D/t thickness, fabrication and casting, load deflection, ductility.


Durability of Flyash Based Geopolymer Concrete

This paper by SOURADEEP GUPTA (National University of Singapore) is aimed at discussing properties of geopolymer concrete, how these differ from properties of ordinary Portland cement, durability properties of fly ash based geopolymer concrete and its advantage when used as a construction material as well. Also some focus has been made on relevant issues that need to be solved and research needs to make it a better construction material.


What are Green Buildings?

Er. Kaushal Kishore ,
Materials Engineer, Roorkee

A green building is that building which is constructed at a well planed location with proper design and sustainable materials. Fitted and painted with eco friendly materials. The building should gives to its occupants healthy and comfortable environment in all climates. It remains cool in summer, warm in winter, inside fully protected from rain, gives natural pollution free air and light through doors, windows and ventilators without any artificial means. For particular requirements it has solar, wind power and eco friendly electrical, mechanical etc. devices.