If you want to make concrete stronger, aside from the obvious and just making your concrete thicker which would definitely make it stronger, there are a few ways you can augment the mix recipe to produce stronger concrete. Most importantly, you can increase the tensile strength of the concrete by adding steel (like rebar or reinforcing wire) or you can add fibers (like fiberglass or stranded glass fibers) which has a similar effect as adding steel. Fibers and steel have high tensile strength which is the kind of strength that concrete lacks on its own. When encapsulated within concrete it will increase the overall strength.

Latex, acrylic and PVA (white glue) make concrete stronger by sticking everything together just like when you put bubble gum in your little sister's hair. Well, kind of like that, but you get the idea.

Concrete mixes can be specified by engineers who design mixes for specifi applications or specific strength requirements. Fine aggregates are added (like fly ash or densified silica fume) which make the mix even more dense. When combined with admixtures like latex or PVA as well as reinforcing steel or fibers and water reducer (superplasticizer) these engineered aggregate ratios combine to create incredibly strong concrete.

None of this information matters if you add too much water to your concrete mix because that is the single biggest factor that determines how strong your concrete will be. Be very careful to not over-water your concrete.

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