L&T CTS Sholinganallur

The main focus of the L&T CTS Sholinganallur project during its construction phase is the slab design. Pre-stressed slabs were intended for the design as they demonstrate greater strength and durability, higher stiffness, improved serviceability, and increase in capacity.

The suggested concrete grade was M50 with minimum strength of 30 MPa after 48 hours. The original mix design was 490 kg cement content with water cement ratio (W/C) of 0.36 using Sodium Naphthalene Sulfonate Formaldehyde (SNF) admixture. 

A compressive strength of a minimum of 30 MPa was achieved after three to four days. The project faced a major challenge in achieving strength without raising costs of concrete per cubic metre as the cement content increased.

The technical team at DCP proposed a special type of high range polycarboxylate (PC) admixture Supaflo PC711 to be submitted to the technical team of Larsen& Toubro Limited for performance evaluation purposes. 

When initial trials were carried out with a water cement ratio (W/C) of 0.35 at the original mix design with DCP's designed admixture, Supaflo PC711, the required compressive strength of 40 MPa was achieved within a shorter time: after 2 days. 

Also using this new mix design resulted in a noticeable reduction of costs and the pre-stressing cycle was achieved by the contractor.

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