Tarmac Toproc Ready-Mix Concrete - Distribution Warehouse for Kwiksave - Wellingborough

Low shrinkage concretes are being increasingly specified for internal flooring as they reduce the likelihood of cracking and enable joints to be spaced farther apart. This is particularly true in the warehousing industry where high storage racking is utilised. Very flat, dust free floors are required with minimal jointing to enable fork lifts to operate efficiently.

Traditionally, joint maintenance costs have represented a high proportion of the total lifetime costs of floors in these situations due to the intensity of trafficking. Low shrinkage, ready-mixed Toproc LS reduces these maintenance costs by enabling the number of floor joints to be reduced and providing a very strong, hard wearing surface and a more durable arris to the joints.

Technologies

Large quantities of concrete were utilised in these warehouse, chiller and freezer floors to a design worked out in close liaison with the Engineer, Crouch, Hogg and Waterman, which was based on the optimisation of factors such as reinforcement design, concrete shrinkage and material costs. This resulted in a floor with an average in-situ shrinkage of 0.02% and an extremely hard wearing surface. The actual shrinkage values were measured in-situ by fixing Demec pips to the surface in 100 metre runs at 1 metre centres and gauge. In all, over 8000 readings were taken to measure the in-situ shrinkage.

Topmix developed Toproc LS utilising specially selected aggregates and specially imported admixtures to produce a high-performance concrete with an average 28 day strength of over 85 MPa and a slump of 150mm which could easily be pumped into place and provide a conventional 2 hour workability life. The mix did not bleed and provided a predictable final set. Some of the concrete was placed by direct discharge, but the same formulation was also pumped. The concrete was compacted by a vibrating poker and the surface levelled and closed with a rolling tube striker. The final category SF1 finish was produced by power trowel/float.

The average time from the start of each bay to the final finishing was 18 hours and the rapid in-situ strength development providing 30MPa in 24 hours, enabled the contractors to traffic the floor the following day and continue construction far sooner than is normally possible.

Product Used: Toproc LS ready-mix concrete

Beneficial Features: Low shrinkage, high abrasion resistance, very low whole life cost

Average In-situ Strength: 85 MPa in 28 days

Typical Total In-situ Shrinkage: 0.02%

This information has been sourced, reviewed and adapted from materials provided by Tarmac Ltd.

For more information on this source, please visit Tarmac Ltd.

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