We bring you the latest development on the construction of the Chandrodaya mandir. Post the Anantha sthapana puja in the presence of the President of India Sri Pranab Mukherjee. Various construction activities started with great earnest. Piling foundation work was started and the land excavated to start the actual construction. We bring to you the latest progress on piling foundation work.
The in house batching plant with silos is seen on far left. Aggregates are being sourced from Lafarge to ensure consistently high quality of sizes and strength. Various sources of aggregates from Madhya Pradesh, Uttar Pradesh & Haryana were subjected to stringent tests like sieve analysis, crushing strength, flakiness index etc before zeroing down on Lafarge's product as the best performing one. M/s Bureau Veritas have been roped in to carry out all the testing related to concrete for the project.
Aggregate & sand for construction of VCM, stacked at site
Piling cage made of Galvanised steel rebars being lowered into the pile boring. Rebars used are of special corrosion resistant grade from Tata steel. Controlled quantities of Copper & Chromium are added to the steel during rebar manufacture to enhance the corrosion resistance of the steel to chloride & sulphate attacks. The second tier of corrosion protection is provided to the rebars by way of Hot Dip Galvanizing to class A thickness (120 microns) - a method used for protection of marine structures, bridges etc in the U.S. & Europe. A third tier of corrosion protection is provided by the use of Bipolar Corrosion Inhibitors in the concrete itself, which forms a uni molecular protective layer on the surface of the galvanised rebars, thereby inhibiting corrosion due to chlorides & carbonation of concrete.
Couplers used for lapping galvanised steel rebars for piling cage
Pile concreting placement in progress using Tremie Pipe. The concrete used for the piling has been specially designed by M/s Bureau Veritas for ensuring high durability of the concrete lasting for hundreds of years, with expert inputs from Prof M S Shetty, a renowned concrete expert. Use of Ground Granulated Blast Furnace Slag (GGBS) is one of the unique features of this concrete design. GGBS is globally used in concrete in marine environments & its use is uncommon in North India. The GGBS is being sourced from Tata Steel, Jamshedpur due to its high glass content of 96-97% as compared to other sources. This high glass content improves the sulphate & chloride resistance properties of the concrete while also reducing the heat of hydration of concrete. Use of crystalline water proofing compound in the concrete is an added feature that prevents ground water penetration into the concrete, protecting the regard from corrosion. Highly controlled use of silica fumes is also undertaken to achieve higher strength of M60 required for the large loads envisaged. The piles are more than 54m deep below a basement level of 5m below grade. Polymer fluid is used during piling as opposed to bentonite slurry as polymer fluid is more environment friendly.
Pile boring work in progress
Pile boring work in progress. The piling is being carried out in an excavated area where the temple basement will be located. The current excavation is 5m below natural ground level. From the excavated level, the piles are bored for more than 54m. A hydraulic rig with a special Kelly which can reach up to 60m is used for the boring. Polymer fluid is used during the boring to stabilise the earth in the boring to prevent any earth from collapsing in the boring. A digital read out on the rig indicates the depth of boring achieved. A physical sounding of the boring depth is additionally carried out to confirm the boring depth.
A state of the art Concrete Testing Lab has been set up at the project site in order to ensure quality conformance for the High Performance Concrete used for the project. Hydraulic Compression Testing Machine, Oven, Motorised Seive Shaker, imported Silver Schmidt Concrete Hammer, slump test apparatus etc are some of the equipment being used.
Quality Control Lab
Compression testing machine
Silver Schmidt Concrete Hammer