I know concrete is stronger than block, I need some kind of a %?
599986
10"x16"x24" Poured concrete wall\nLoad = 711,000 lbs\nGross Strength = 4670 PSI\n\n10"x16"x24" Block wall\nLoad = 164,500 lbs\nGross Strength = 1580 PSI\n\nSo it would seem the following:\nPoured is ~ 295% stronger than block\n\nPlease see the sources below for more information
638894
What do you want to know?  Concrete, Rebar, Wire Mesh, Thickened edge, what?
173706
Portland Cement Association is apparently saying that the fiber reinforcement does no good, i'm not exactly sure.  The major property is that mortar and concrete have poor tensile strength but excellent compressive strength.  The goal of the fiber's or any other method of reinforcement is that as the cement hydrates and hardens it pulls the concrete or mortar into tension and it gains tensile strength from the fibers.
647683
wat yah mean by concrete by d way!?!?
179298
#6 vertical bars @ 12 in centers with 90 degree bends top and bottom, #8 lap bars horizontal full length and a total thickness of 12 inches. 3000 to 4000 psi concrete with crushed rock and a water cement ratio of under .45 should do the trick.
726042
The most important thing is bend don't break, the tree method.  Therefore, wood and steel far outweigh brick.\n\nAnything that will allow for some movement, but not too much, and still retain strength, is good.\n\nMany buildings, especially very tall ones, either have ancors that are very deep below the ground level  or pivits which allow for some sway.
1062234
Use the regular "concrete mix design" and add a "water reducing admixture".\n\nThe water reducing admixture type should be selected so that it does not require a reduction in the amount of "cement" that was in the original concrete mix design.\n\n(Note that a standard concrete mix design includes such things as __% of aggregate (rocks), __% of sand, __% of cement, __% of ash, __% of water, etc. and it does not normally include a water reducing agent.  It would be an additive supplement.)
1112775
The density of dry loose gravel regardless of size is on average about 90 to 105 pounds per cubic foot. This assumes a fairly consistent size. If the gravel is a mixture of large and very fine material then it will be some what higher because the fine grains will fill in between the larger pieces. \n\nAny granular material that is evenly graded (all pieces about the same size) will have the same degree of void space between granules. It calculates to around 30% (I don't remember the exact number but you can calculate it you like). Most sand and gravel is made of the same ground up rock, therefore density of the individual grains or pieces is the same. With 30% of any cubic foot the same and the density of the grains the same, sand or gravel will have the same density.
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.
911920
You need to determine the depth you need to go down by knowing the frost line in your area. Dig your trench a foot below the frost line, and pour a concrete footer that is at least 12" wide and 18" deep. Put #4 rebar in the footer, 4 bars, 2 at 3" off bottom of footer and 2" in from the outside edges, and 2 more bars at 3" from the top of the footer, above the lower bars. You'll also need some vertical rebar sticking up from the footer on 24" centers to fit into the cells of the block. On the corners, put vertical bar so you have a bar in the corner and the first cell after the corner on each side (3 bar corner).\nBuild your block wall after the concrete footer has cured. If you need to extend the vertical rebar you installed, use wire ties and overlap the joints by a minimum of 6". When the block wall is finished, pour the cells in the block with a grout mixture, or concrete mix with pea gravel.
252653
The hammer must be calibrated with a compression test cylinder or a flexural strength break on the same batch of concrete that it is used. Once the hammer is calibrated, it works by measuring the penetration of a rod pushed into the surface of the concrete at a known repeatable force. The greater the penetration of the rod, the less the strength of the concrete. Think of it as pushing your finger into mud. The stiffer the mud, the less you can push your finger into it.
971512
Take a cube and put handles on the top and bottom surfaces...\n\nFirst push on it from the top and the bottom - the block  is in compression. Next, pull on the top and the bottom - the block is in tension. Finally, push the top to the left and the bottom to the right (don't rotate the cube - keep the forces parallel to the top and bottom surfaces) - that is shear.
1136830
Water-cement ratio is a term usually associated with concrete. It is the ratio of weight of water to the weight of cement used in the concrete mix. It has some important influences on the quality of concrete produced. Concrete with a low water-cement ratio may become strong and durable, but the mix would become very difficult to place. If water-cement ratio is increased then the concrete mix would be more workable (or loose). It is easier to place the concrete in this condition but too much water can cause pores to form in the microstructure, thereby reducing the durability. The water-cement ratio is a critical factor in the design of concrete mixes.
745166
focus on a triangular frame- these frame are the strongest. also try googling for the manufacture of bridges and find out why certain bridges are built.
553454
Different companies use different formulas but generally cement is about 98% clinker.  In other words, 98 tons of clinker produces about 100 tons of cement.
708143
add the parts together 4 + 1 = 5\ndivide the 100 by 5 = 20\ntherefore one part = 20\nyou need one part of cement = 20kg\ni hope that helps
807934
Typically when a material is refered to as strong, you are refering to its mechanical property can 'Tensile Strength' - How much force you can pull it with before it breaks.\n\nIt terms of what makes one material strong compared to another, is related to many factors - On a microscopic level, basically how easy it is for discontinuities in the material to move.\n\nWith reference to your concrete example, the reason concrete of a skyscraper is strong, primary is because it is steel reinforced; steel bars are embeded inside the concrete - The combination of steel and concrete is a good one because steel is very strong in tension (which concrete is not) but concrete is very good in compression.\n\nWhen you combine different materials like this, the resulting material is refered to as a composite. Composites presently are the best structural materials that we have; examples are fiberglass/polyester and  carbon/epoxy. Carbon/epoxy is extremely popular for aerospace structures because of its high strength and low weight, as well as its durability. When composites first appeared, they were very expensive and limited to really hi-tech applications like aerospace, but today you can find them everywhere - golf club shafts are commonly carbon/epoxy for example.