what are some of the reasons for intentionally delaying the placing of fresh concrete?
437376
Waiting for proper weather to ensure a solid set. If it's too dry or too humid, too hot or too cold, the concrete may not set properly and will need to be removed and repoured.
794020
Maybe to help futur contractors make better buildings.
973045
Concrete, as it cures, forms a complex and insoluble "crystalline" structure.  Crystalline materials such as this have atoms that are more or less "locked" in place by the kinds of chemical bonds that formed during the curing process.  Since the atoms are more or less fixed in space relative to one another, they can't slip and slide to dissipate stresses.  So, when a large enough force is applied, the strong chemical bonds finally break and a "brittle fracture" occurs.  One observes concrete shatter, creating splinters and dust, and the material is described as brittle.
426482
after political pork barrel pandering/pondering, the possibilities of placement are prepared\n\nthen civil engineers spend many hours calculating how big each piece of the structure should be to make it safe, and how large a foundation will be needed so that it doesnt fall over or sink into the ground.\n\nafter that its just construction
422255
One line answer due to adhesion force between cement and wall.
316535
Why is this under engineering?
759987
Do what they do at concrete batching plants. Get out your bucket wheelbarrow and shovel.\nTrial and error on small batches as the properties of the materials can vary from place to place. Strength also requires greater input of cement and hence more cost.\nSuggest you go to the local concrete batching plant and ask for an indicative mix for 20, 25, 32MPa strength concrete.\nGood luck.
612809
A precast concrete frame(pcf) is a frame casted at a place other than the place where it has to be fixed.Sometimes due to certain reasons ie shortage of space,raw material,congenial atmosphere etc. a pcf is better in durability,stability and provides human comfort,environmental efficiency and is aesthetic also.
957641
Usually it is done before you start to do any work around or in the building.  You need to know where things are before you start doing any new work.
1052485
Concrete slabs typically have a high thermal mass. In older buildings, concrete slabs cast directly on the ground can drain heat from a room. In modern construction techniques, concrete slabs are usually cast on top of thicker layers of insulation, for example expanded polystyrene, and may contain underfloor heating. Even so their thermal mass can lead to a delay warming the room when the heating is switched on.\n\nYou could try contacting UHMA, which is the Underfloor Heating Manufacturers Association and ask them for some help!    I have also listed some people who do thermal insulation.\n\nHope this all helps with your project!   And they may also send you drawings so you can include them!
58921
This right has more to do with delays being reasonable or unreasonable, than the actual length of the delays. Whether the delay is reasonable or not would depend on the docket of the court in jurisdiction, and the complexity of the case.
452583
Among the possibilities, the foundation could be affected by compression from the damp and unyielding surrounding soil.  Extra drainage gravel around entire foundation may minimize foundation pressure fissures/cracking/collapse.\n\nHigh water table may require continuous or nearly continuous pumping to prevent flooding of basement or lowest level of structure.\n\nSlab construction, if possible, would eliminate below grade issues.
633540
well there are earthquakes problems, also if the ground you are about to lay your foundation is too soft that you can't really built anything big on top of it like the leaning tower of pisa.  Also right now there is a problem with building materials, the prices are going up because in China there are a lot of new buildings being made, causing some projects here to be either cancelled or stopped because of the the price for materials.
491768
It is asking the judge to delay imp;ementing an order that has already been issued.  You might, for example, ask for a stay while you perfect an appeal, if irreparable damage could be done if the order is carried out immediately.
375527
good question.. i think the best answer is..\n \n              TO SAVE SPACE!
1018401
If there were a centrifuge large enough to spin a quantity of concrete mix at incredibly high speeds, you could separate concrete into its parts.  When a mixture (not a solution) is placed into a centrifuge, it is spun at great speeds and the constituent parts will separate out, those with greater mass will be forced to the bottom and those with less will remain at the top.  A gradient will form of increasing mass (and usually increasing density) from top to bottom.  With concrete you would have the supernatant liquid (water) on top, a series of silt layers and then the large stone and gravel pieces on the bottom.\nI hope that answers your question.  Why did you need to know such a thing?
347282
The concrete formula has a very low "slump".  "Slump" is a measure of how much the concrete will move while its wet.