Your concrete may me drying out too rapidly which will cause symptoms that you have. Once the concrete is set, keep it covered with wet rags to keep it moist at all times for the first 2 days. This should increase its strength. You may want to consider the “dry pack” method.

How do you make concrete denser?

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How do you make concrete not brittle?





The secret is in the mix. A new concrete mix replaces 40 percent of cement with plentiful materials and byproducts. This formula reduces brittleness and “bounces back” more than traditional concrete. Using non-cement fillers may reduce environmental impact.

Why is concrete so brittle?

Plain concrete is brittle because it has low tensile strength. Innately, this mechanical property of concrete (just like any building materials) depends on the synergistic contribution of its components which are water, cement, and aggregate.

Can you rehydrate concrete?

Adding more water and mixing will possibly make it smooth again, but all those bonds that have started to form will be broken apart and will not form again. Of course many new bonds will form and the concrete will get hard again, but once it is over-watered it will never be as strong as it could have been.

How do I make concrete weights heavier?

The best way is to use the standard mix, but more of it! Consider adding Rebar steel to the concrete mix for increased weight and strength (before pouring the concrete and it sets, I cannot stress this enough).

What is done to achieve dense concrete?





Concrete Aggregates



The high density of such concrete is achieved by using high-density aggregates, and mostly these are natural materials, especially barytes, but also magnetite, haematite and other forms of iron ore.

How do you make concrete more flexible?

Flexible concrete is different than traditional concrete in that it has polyvinyl alcohol fibers and very fine silica sand instead of course aggregate. Other fibers such as silica fibers, glass fibers, steel fibers, and asbestos fibers can be used. These micro-fibers give the new concrete its flexibility.

Does a concrete brittle?

Concrete is a strong material in compression but weak in tension (when it is pulled, bent or stretched). It is essentially a brittle material.

What is the effect of not enough cement in a concrete mix?

If too little cement is used, the aggregate mix will not cohere and the concrete will crumble under pressure.

Does more water make cement stronger?



The increased water leads to a higher water-to-cement ratio. When excess water creates greater spaces between aggregate materials, the voids fill with air after the moisture evaporates. The resulting inadequate compaction reduces the concrete’s strength.

How many years does it take concrete to fully cure?

Generally, concrete sets in 24 to 48 hours allowing for you to walk on it and partially cured within a week (keep the cement free and clear of heavy equipment during this period) at which you can continue building/construction. Most mixes fully cures at 28 days.

What causes concrete to harden?

Cement and water form a paste that coats each particle of stone and sand—the aggregates. Through a chemical reaction called hydration, the cement paste hardens and gains strength.

How long will it take for the concrete to achieve 100% of its strength?



Concrete typically takes 24 to 48 hours to dry enough for you to walk or drive on it. However, concrete drying is a continuous and fluid event, and usually reaches its full effective strength after about 28 days.

What happens if you add too little water to concrete?

For large surface areas like sidewalks, the concrete needs to be watered in order to keep the surface from drying out before the cement has had time to fully cure. If it dries too quickly, the surface of the concrete will be weak, and will be subject to spalling.

What will break down concrete?

Concrete is a durable building material that takes special materials to dissolve once it’s hardened into place. Phosphoric acid and trisodium phosphate are the main compounds used to dissolve concrete leftover from masonry work.

What happens when you put sugar in concrete?

Sugar increases the setting time of cement up to 1.33 hrs at dosage level of 0.06% by wt of cement. There will be no effect on workability, compaction by the use of sugar as admixture in concrete. Higher long-term compressive strength is achieved in concrete by the use of sugar as admixture.

What dissolves concrete fast?



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What does sugar water do to concrete?

The sugar slows down the setting of the concrete, and is used in hot conditions or when large amounts of concrete must be poured out before setting occurs. Very small amounts of sugar delays the hardening of concrete without influencing its strength or other properties once finally set.

How do you make concrete soft?

Smooth the surface with a steel trowel after it’s partially hardened. Hold the trowel almost flat and swing it in large overlapping arcs while applying pressure. Float the concrete when you’re done grooving and edging (Photo 6).

Does sugar make concrete stronger?

Sugar delays the setting time of cement by up to 1.33 hours at dosage level of 0.06% by weight of cement. No effect on workability, compaction by the use of sugar as admixture in concrete. Higher long-term compressive strength can be achieved in concrete by the use of sugar as admixture.