FAQs

What do the new 2004 TXDOT Specs require?

Assuming there are no changes to the standards, you'll be required to provide the Test equipment to TXDOT to determine the strength criteria setout in the plans. This is typically the compression strength test. Therefore if you have a project with concrete on it, but no concrete paving (360 items) then you'll be required to give the inspector a concrete compression testing machine, cylinder molds, and curing tank for their use during the project. If you have concrete paving on the project (360 items) then you'll need to provide the concrete compression machine plus be able to check temperature, air entrainment, and slump. The difference in the paving item requirement is that for the paving work you'll have to develop a quality control plan and do these test yourself. Someone on you're crew will have to be trained to perform the air, temperature, slump, and compression test. In addition there is a training requirement for the making of the test cylinders.

Who can certify my key people to perform these test?

At present TXDOT list an ACI Card as an acceptable certification. TXDOT also states that there must be a written and hands on portions to the test. Test programs must be pre approved by TXDOT to be acceptable. Contact your local ACI or NRMCA Chapters to find Programs in your area.

What's involved in capping cylinders?

At Field Labs we don't rent the equipment to make capping compounds or apply them. The steel retainers and neoprene capping pads that slip over the cylinder is an acceptable method to cap a cylinder and it's much easier. These are supplied when you rent the concrete compression machine. They are good for about 100 test and then neoprene inserts must be replaced. The replacements are relatively cheap at about $15.00 per set. There is more flying debris when a neoprene capped cylinder is broken, so wear your safety equipment and keep the door closed on the machine.