March 1997 Table of Contents

Features Foundation Waterproofing Basics

There are many causes of water leakage into building foundations. By using this checklist, contractors can eliminate as many of these causes as possible and increase the odds that a basement will stay dry throughout its service life. Read more

Features How to Make Sure Your Coating Contractor Meets Specs

For newly formed concrete structures, the responsibility for ensuring that coatings are applied properly typically rests on the shoulders of the concrete or general contractor. It's necessary to develop detailed coating procedures, monitor the coating contractor's work, and understand what tests should be performed to determine the quality of the finish. Addressing these issues before the job begins can help prevent premature coating failures, costly reworks and delays, and damage to a contractor's reputation. Read more

Features Sealing Joints in Tilt-Up Panels

Most tilt-up contractors don't seal tilt-up panel joints themselves. But how can they ensure that subcontractors do the job right? Article offers the following 10 tips, based on the advice of experienced caulking contractors: Read more

Features Textured Concrete in Three Easy Steps

Looking for a new way to dress up plain concrete? Tired of fussing with repeating patterns? If so, it's time to try a new concrete texturing tool: Brickform Shasta Seamless Texture Skins. Read more

Features No More Crooked Anchor Bolts

An innovative anchor-bolt template system manufactured by Las Vegas-based Precision Concrete Anchor-Setting Systems Inc. (PCAS) helps to ensure accurate and plumb bolt placement in concrete. The system uses rigid but fully adjustable clamps to hold the anchor bolts in an open steel framework. It not only ensures precise bolt placement, it permits unrestricted finishing of the concrete right up to the bolt. The reusable system is also easy to relocate, making it ideal for repeated pours where the bolt placement is the same, such as for gantry crane rail baseplates or signal and lighting standards. Read more

Features Slab Forming Simplified

A rentable modular forming system with components light enough to be handled by a single laborer helped a Valencia, Calif., contractor speed the construction of a 48,000 square feet of post-tensioned garage deck. Crews were able to erect 16,000 square feet of deck forms in only two days. Read more

Features Analyzing Moisture Problems In Concrete Slabs

Problems involving water and water-vapor migration through a concrete slab on ground can affect a variety of flooring materials. Wood, carpeting, vinyl composite tile, seamless resilient flooring, and coatings such as urethanes and epoxies can experience both aesthetic and functional failures, ranging from staining and mold growth to buckling and loss of adhesion. Read more

Problem Clinic Thickness Tolerance For Residential Driveways

Is there a published thickness tolerance for residential driveways? I'm a concrete consultant, and one of my clients is a homeowner who had a concrete driveway built. The contract specified a 5-inch thickness. After the concrete had cured, the owner cored Read more

Problem Clinic Vapor Barriers Under Sidewalks?

For sidewalks placed directly on the subgrade soil, is a sheet-plastic vapor retarder useful or harmful? Read more

Problem Clinic Temperature Protection For Concrete Piles

I need to place concrete in four 30-inch-diameter, 37-foot-long steel-shell piles that are driven at the bent lines of a river bridge. River depth varies, but is 5 feet in the deepest spot. After the steel shell is driven, the water level is about 1 foot Read more

Problem Clinic What's a 1:2:4 Mix?

I have a residential-concrete specification that calls for a 1:2:4 concrete mix. What does that mean? Read more

Problem Clinic Best Material for Embedded Sleeves

We have to embed metal sleeves in a concrete floor slab and are concerned about corrosion. The sleeves protrude 4 inches above the floor surface. What's the best metal to use for this purpose? Read more

Problem Clinic Effect of Petroleum Products On Concrete

Does exposure to petroleum-based lubricating oils and transmission fluids cause concrete floors to disintegrate? Read more

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