Concrete demolition and rock breaking has never been easier with Dexpan Expansive Demolition Grout. Dexpan is a powder with amazing 18,000 psi expansive strength when mixed with water. Poured into drilled holes, Dexpan can break concrete and rocks safely and quietly, while providing silent cracking. It is safer, easier and more cost effective.
Amazing 18,000 psi expansive strength when mixed with water breaks reinforced concrete, granite, marble, limestone and other non-porous rocks
3-easy steps to use: drill, mix and pour, to ensure success, watch instruction video before use
Cracks according to designed drilling patterns for controlled demolition and easy clean up
An alternative to blasting, hydraulic breakers and jackhammers, which is safer and efficient, works without noise, vibration or dust by providing silent expansive cracking
Non-toxic material, SDS (safety data sheet) is available upon request
3 types of Dexpan, this is type 1 (for rock or concrete temperature 77F-104F)
44 lb. box (Includes four 11 lb. plastic bags)
Fills up to 35 lin. ft. (10 m) of 1.5 in. (3.8 cm) Dia holes
Not recommended for concrete slab less than 6 in. in depth
Give it 24-hours for best results
Safety goggles, rubber gloves, dust mask is required
I bought this to remove some solid concrete front steps (the top platform was 3ft wide and about 2.5ft tall). that had developed a bad crack on the bottom. I'm replacing them with a small wood deck. Renting a hammer drill (with an 1.5" SDS-Max or spline bit) is generally much cheaper then renting a jackhammer, and drilling the holes was less work (still work, but not as hard). Combined cost of this box + hammer drill rental ended up being about 1 day of jack hammer rental (jackhammers work good on flat surfaces that crack all the way through like driveways (up to about 6" deep), but breaking up a big block of concrete with one is a lot of work). Another option is to rent a bobcat with a mini-crane and pull it out in one piece but that would probably be more $. Do the Math to figure out what works best for you. You could theoretically use a hammer drill with a hammer/chisel bit (would be easier to wield on a big block then a jackhammer), But that still seems like a lot of work to me. Might be cost effective if you buy the drill and have lots of time.
Also determine how you plan to get rid of the concrete before hand. Most yards charge by the ton or by the load. You can also rent a roll off dumpster in some cases.
Each bag filled about 7-8 1.5" holes drilled about 15" deep. this kit has 4 bags. The holes should be drilled no more then 1 foot from the edge of the piece, or from another hole. Drill pattens are available online. The instructions say it takes 24 hours to fully harden/crack, but i found that for the cracks to fully develop it takes about 72 hours. This could just be due to the cold weather (make sure you buy the correct type (1,2, or 3) based on the ambient temp). The speed is also dependent on a bunch of other things like humidity. My advice if you don't see results is to just wait longer. They also have a support number that is helpful and informative and instructional videos on Youtube in addition to the instructions on the box and on each bag. usually if you see a hairline crack within 6-12 hours it will become a .5-1" crack by time it is done working. drill 90% of the way through the piece. leave about 1" at the top of the hole (do not overfill, although i did overfill a couple accidently, and it still worked).
Additional tools/supplies needed are a plastic bucket for mixing (i used one with a spout so that i didn't need a funnel), A mixing drill/drill bit (they say you can mix by hand, but mixing it, even with the drill, took some time as there is a lot more powder then water), and something that will measure 1.5 liters. They say you should vacuum/blow out out any dust left in the hole, also use a stick to remove bubbles. I didn't do either and it worked. but if you want to you do that you will need a vacuum or an air compressor with blow gun attachment. You can probably use the stick side of the mixer to remove the bubbles.
Easy to Use, Performs Well, Easy to Install, Easy to Work With, Quiet