How can we bond the old and new concrete together?
928879
Ooooo just pour it over and level it off!
142989
I am having a hard time picturing the gaps you are trying to fill, so I'm not sure if my ideas will be helpful.  Perhaps you could try ceramic as an insulator.  It also depends on how long the surface will be exposed to the high temperatures.  If its not too long, perhaps you could use wood that has been soaked overnight in water.\nThe aluminum isn't a bad idea, but perhaps you need thicker aluminum.  Like maybe cut open a few soda cans and flaten the result into a crude sheet of aluminum.  Maybe two or three layers worth would do the trick.\nMaybe some gravel or stones?\nWell, those are just some ideas.  Not sure if any of them will work, but maybe that gives you some things to explore.
451543
a uniting -joining together
915726
1. get a toy one and put it in\n\n2. get a toy one and put it in\n\n3. the extinct ones\n\n4. use the bridge
558357
I would submerge pieces of concrete in water for several hours. Then put them in freezer. After freezing, thaw them again. Repeat and repeat the process until concrete fully degraded. Does it worth the effort?
866685
If the soils removed from the excavation aren't too wet then use the same soils. \n Why do you have post tension cables on a slab on grade design?\n If you are trying to bring the subgrade level across the whole floor area to minimize the purchase of extra concrete ,then sand would prob. be the way to go.
488788
Tie a string to it ,at other end add a brick to it,leave it hanging for about 3 years
375025
A cold joint is a preparing a concrete surface (existing) to accept a bonding with new concrete. In other works you are creating a bonding area to which you can old and new concrete meet. In some cases the surface is treated with a bonding agent to ensure a stronger bond.
226582
IST MAke sure the surface is clean and dry..put a rugby on the floor and on the tiles..after a few mintunes or when its almost dry stick them together.
519144
drop a concrete block on it
725476
put some gold bond powder down there.... hopefully it will not turn into some sort of paste
248507
hot glue might hold depends on the size of the rocks... it is water proof
753667
I assume you mean cement and concrete.\n\nCement is the bonding agent used to make concrete mix.  In addition to cement, concrete is made of aggregate (gravel and rock) and water.  The formulas vary somewhat according to the application, and whether the concrete will be pumped when it is poured.  You should not have too much water in the concrete mixture because it will reduce the strength of the concrete when it is cured.  Many times a sample of the concrete is poured for laboratory testing at a later date.\n\nThe evaporation of water from the poured concrete must be controlled while it is curing for maximum strength.  This can be accomplished by spraying water on the surface several times a day.  The hotter the weather, the more frequently it should be wetted.  Alternatively, there are products available that make a moisture barrier to reduce evaporation when sprayed on the surface of the concrete.\n\nReinforcing steel (rebar) is used inside concrete structures to improve strength and reduce cracking.  Building codes may give guidance as to the quantity and placement of rebar, but sometimes a structural engineer should be consulted.  Wire mesh is commonly used for large flat areas, like a slab or sidewalk, but it is not very effective and rebar is preferred.\n\nCement is also used with sand and lime to prepare mortar for masonry (brick and concrete block), and for plastering and stucco.  When the mortar is to be used for ceramic tile, the sand is usually omitted.
775803
With insulation.  Put it between walls or floors.
394220
Build a bridge and get over it
282709
patience and shampoo or a rebond :)
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?