how  does the concrete from the underground pool stay still while the concrete is getting dry?
347282
The concrete formula has a very low "slump".  "Slump" is a measure of how much the concrete will move while its wet.
815692
TIME, TIDE AND CONCRETE WAITS FOR NO MAN.\nIt is poured insmall slabs because :-\n1.  it is easier to handle and maintain levels\n2. it will expand and contract more uniformly and lessen the chance of cracking occurring\n3. in large areas it enables falls of levels to be made in different directions for drainage  lines.\n4. in doing a big pour you have to ensure that you don't have to wait too long between loads as the first load could go off before you put down the last one.
143007
due to formations bearing bentonite type clay bases. in very basic terms they are like a dryed out sponge when water is added they swell. also when the bottom hole temps get too high your mud will cook out if water based. go online and look up mud logger or mud logging you should find some very useful info there or knowlage as to where to go for futher search
555711
The "secret" is rebar (reinforcing bars of iron).  Poured concrete is of cource fluid and would leak unless poured into water-proof forms (slabs).  The rebar becomes embedded in the concrete and gives it extra strength once the concrete is cured.  Thus the road bed is much thinner than the main supports (that hold up the weight of traffic and the entire bridge).
1041459
You could be retaining water.
297865
Both water and concrete are insulators, so this cannot be the deciding factor. However, concrete has a specific heat capacity of ~3.3 J/g*K, while water has a specific heat capacity of 4.184 J/g*K, so, for a given addition of energy, a given mass of water will only increase in temperature about 78% as much as that same mass in concrete. Then, there is the fact that the surface of the concrete is all that has to heat up in order for it to feel hot (and indeed, this is all that is really heated much by the sun), while currents generated by heat gradients in liquids (such as water) ensure that the water will not feel as warm as the concrete, even discounting the disparity in specific heat capacity between the two.
75835
Surfactants are used to prevent the surface tension forming the bubbles.  However, carefull experimentation must be done to make sure they do not have a negative effect on the strength of the concrete.
709288
the air is already saturated with moisture and cant hold much more, so the sweat on your skin stays instead of evaporating which is a natural cooling process
943767
I am not sure if you want to find a more sophisticated method of MIXING it or if you are looking for the forumla to MAKE concrete but if you wanted to make your own concrete it consists of equal volume amounts of cement, sand, and gravel. Cement itself is made up of limestone, gypsum, and clay. And if you wanted a more sophisticated method of mixing it, get a 5 gallon plastic paint bucket with a lid. Pour the dry concrete and water into the bucket and then close up tightly and start rolling the bucket.\nRoll it for about 20 minutes and you will have nicely mixed concrete.
499168
When the glass hits the hard concrete, there is an immediate and absolute loss of momentum (sudden impact).  When the glass hits the soft carpet, the glass slows down less quickly, therefore there is a less sudden change in momentum.\n\nBest wishes.
172924
The simple way is to make a solor still. Dig a hole, fill with some salt water.  Take some plastic (big enough to cover hole) Weigh it down around the edges so that it wouldn't move or blow away leave a hint of slack in it.  Put a smal rock in the middle.  Put a can/cup ect under the rock. As the water evaporates it will collect on the plastic, on drip from where the rock is.  Drips fall in cup.  Fresh water.  You can boil sea water and cool steam, collect drips in bucket.
124552
Soil absorbs moisture. It has small openings and the water gets in the small holes. The cohesion and adhesion of the water constitute a force that keeps the water in the soil, to a certain extent.
546333
It hasn't been exposed to air yet. It takes air to harden.
421079
Your question is not very specific. However, here are some information that might be helpful.\n\n1. If you are pertaining to fresh concrete, there is no specific record on the degrading effect of diesel. In fact, actual construction sometimes uses diesel based form release agents that debonds the fresh concrete from the formwork. Diesel is oil based. Knowing that, it will not in anyway mix or affect water content of the fresh concrete since oil and water repel each other. It may be important to note however, that there is no defined ACI or ASTM specification for the use of these form release agents. These materials are mostly regulated by EPA.\n\n2. In terms of concrete design, it is apparent that the main effect of diesel is its specific gravity. Diesel has a specific gravity ranging between 0.81 - 0.96 (based on water SG @ 60 deg. F. This means that you would not require as much reinforcement as you would in a tank that would store water.\n\n3. Some waterproofing materials that are used to protect concrete are diesel based. Again, this proves to show that diesel has no degrading effect on concrete.
272188
In its simplest form, concrete is a mixture of paste and aggregates. The paste, composed of portland cement and water, coats the surface of the fine and coarse aggregates. Through a chemical reaction called hydration, the paste hardens and gains strength to form the rock-like mass known as concrete.
406675
Moisture retention will be the first problem...it's usually not heard of for mold to go all of the way through concrete, but it is possible.
743532
.  Concrete is much stronger against compression than it is against tension.  When concrete is bent, the tension on one side will increase, while the compression on the opposite side increases.  The concrete will fail when the tension reaches a few hundred pounds per square inch.  It will not fail in compression until it reaches 3000 to 4000 or more pounds per square inch.\n.  Post tensioned cables, installed in the concrete before placing the concrete and pulled to high tension after the concrete has hardened, put the whole piece of concrete in compression. Lets call this pre-compression compression on one side, and negative tension on the other side of the concrete. When this concrete is bent, tension will not develop in the side which would normally go into tension until the negative tension placed on it is overcome by the bending force (called the bending moment) increasing the tension on that side to a positive value.  So more bending moment can be applied to the concrete before it starts to crack.