Slump is an indication of how well the concrete flows. This is important to determine how much water is in the concrete. Usually, the lower the slump, the less water is in the mix and the stronger the concrete will be. With today’s concrete though, you can achieve a high slump without using too much water with the application of super plasticizers or mid-range water reducers. The normal slump is 4” to 6”.

There are many reasons that concrete cracks. Concrete can crack from a super-imposed load that is greater than the tensile strength or the compressive strength of the concrete. Concrete can crack from rapid thermal changes. But the most common type of cracking, shrinkage cracking, is due to volume changes within the concrete. As concrete changes volume, usually shrinking, the tensile strength of the concrete is exceeded by the strain of the volume change, and the concrete cracks. See similar questions...

A slump test is performed to determine the consistency of the concrete, which relates to the workability of the concrete. Most specifications limit the slump to 4 inches, which is the vertical distance that concrete subsides after being deposited into a 12" tall cone shaped mold, which is subsequently removed by pulling off the deposited concrete in an upward motion. See similar questions...

Well apparently it has to do with something called gene expression, which refers to the pattern in which genes are switched on and off. And gene expression has a major effect on your body's biological processes. Each cell in your body contains a 'power-factory' that produces energy, called the mitochondria. See similar questions...

This depends on the application and the design of the concrete mix. For normal concrete a moderate slump of 3" to 5" is desireable. High slump is desireable when the concrete must be placed around a high concentration of reinforcing steel. Low slump is desireable when concrete is placed in large open forms, or when the form is placed on a slope. The concrete mix must be designed for these special applications. See similar questions...

Slump loss is minimized. Since the cement is already wet it has less to absorb during transit. The driver typically does not need to wait long after loading to know what his slump is. The load will not "tighten up" as with a usual dry batch load. However, this does not mean that it will "go off" earlier or later. See similar questions...

For a comparison between Fast-Tube? and cardboard column forms, please click here. For more information, please contact Fab-Form at (888) 303-3278. See similar questions...

I get this question a lot. Everybody hits a slump or "Plateau" from time to time. This will pass but there are things you can do to make the down time productive. Get some older drawings from your last slump and redraw them. Chances are that you're a better artist now and you will begin to see where you've improved and where you still need to improve. See similar questions...

Answer: The term slump simply refers to the consistency of the concrete in a plastic state (prior to hardening). Slump is a measure of how wet or stiff the concrete is, obviously, the more water used in producing the concrete, the wetter (or higher) the slump will be. Again, excessive water causes a dramatic loss of strength. Applications exist where higher slump (wetter) concrete is necessary becasue of difficulty in placement or specification requirements. See similar questions...

The term slump simply refers to the consistency of the concrete in a plastic state (prior to hardening). Slump is a measure of how wet or stiff the concrete is. Obviously, the more water used in producing the concrete, the wetter (or higher) the slump will be. Again, excessive water causes a dramatic loss of strength. Applications exist where higher slump (wetter) concrete is necessary because of difficulty in placement or specification requirements. See similar questions...

Isotonic solutions cause no swelling or contraction of the tissues with which they come in contact, and produce no discomfort when instilled in the eye, nasal tract, or other body tissues. See similar questions...

The tonicity of the solution is less than that of the cells. When this occurs, water enters into the blood cells causing them to swell and finally burst, with the liberation of hemoglobin, or water invasion of the body’s cells. If this invasion is beyond the body’s cells, then water intoxication results, with convulsions and edema. See similar questions...

The tonicity of the solution is greater than that of the cells, which can cause a variety of complications, such as, hyperglycemia, intracellular dehydration, loss of water and electrolytes, dehydration and coma. See similar questions...

Here a "hack" is a clever shortcut or a lesser-known, faster way to get something done. A hacker believes that information-sharing is a powerful positive good, and that it is a hacker's duty to share her expertise—so we will. See similar questions...

Please see RTFM in the Jargon File. Posters please note: Moderators are unlikely to approve follow-ups that consist solely of "RTFM". See similar questions...

Read The Fine FAQ, a variant of RTFM. Also RTFAQ Posters please note: Moderators are unlikely to approve follow-ups that consist solely of "RTFF". See similar questions...