Question:

Our firm needs a prescriptive standard for our cure and seal contract language. We used to call out Federal Specification TT-C-800. We liked it because it had a minimum solids specified and a specific water retention minimum. We are very aware TT-C-800 has been discontinued as an active standard. What can we replace it with?

Answer:

Specification professionals and concrete placement and finishing contractors have been searching for a specification standard and a product to deliver superior curing a sealing to their respective concrete projects.

A specifier's stock in trade is a clean crisp and enforceable set of contract documents that address the overall scope of the project. A concrete contractor's stock in trade is more tangible, his being the proper placement and finish of the concrete upon the project. Either effort is no less scrutinized than the other.

In the past, the specifier had to modify some of the existing standards language to ensure a high solids curing and sealing membrane of sufficient moisture retention and ultraviolet stability. This modifying language did not lend to the pursuit of clarity or uniformity the specifiers were aspiring to reach. Concrete contractors were also needful of a specification standard for high solids cure and seal membranes, with predictable ultraviolet stability. The products performance, being specified needed to become standardized, and therefore simplify bidding and product selection.

These mounting needs have been met by ASTM Standard Specification for Liquid Membrane-Forming Compounds having Special Properties for Curing and Sealing Concrete. The designation is ASTM C 1315 as published in volume 04.02.

The ASTM C 1315 standard provides precise requirements for membrane forming liquids. These membrane forming liquids are intended to be applied to the surface of fresh concrete or to the surface of hardened concrete. The resulting membranes should demonstrate alkali resistance, acid resistance, and promote adhesion properties. Additionally, these membranes should be able to have some predictable level of ultraviolet resistance.

The general requirements of an ASTM C 1315 membrane forming liquid would be a minimum of 25% solids, a moisture retention minimum of four-tenths of a kilogram of water loss over a square meter in 72 hours and a promotion of adhesion, listed at 145 psi pull off strength.

ASTM C 1315 has become the specifiers standard of choice and the significance of its use is to standardize a durable curing a sealing membrane. This membrane is to assist in the prevention of concrete dusting and provide excellent curing conditions for the concrete and a surface hospitable to bonding adhesives.

Concrete placement and finishing contractors have gained a standard in ASTM C 1315 by which to compare competing products. The majority of concrete placement and finishing contractors perform their duties with pride and professionalism. Providing these critical trades with an excellent standard to select the best curing and sealing membrane, is a step forward in quality and uniformity.

L&M Construction chemicals, Inc. offers five ASTM C-1315 compliant products, Dress & Seal 30 and Dress & Seal WB 30, Lumiseal Plus and Lumiseal Plus Water Base, and last but not least is the old stand by, Surfaseal by L&M.

Sharpen up the standards in your specifications and lend an aire of professionalism to the concrete placement and finish work, use cure and seal membrane forming liquids complying with ASTM C 1315.