This reduces the incidence of alkali-aggregate reactions which cause damage to hardened concrete.

But, like any people who are both poor and enterprising, they put the bags of hardened concrete to another use rebuilding damaged roads.

A nuclear bomb "factory" need not be large, and it can be buried under hardened concrete.

Built of hardened concrete and re bar with walls six feet thick, it was a veritable fortress.

In addition to entrained air, hardened concrete also contains entrapped air.

Before pouring each floor, crews embedded U-shaped metal channels that will be held in place by the hardened concrete.

Superman has been known to leave his fingerprints in steel and in hardened concrete, accidentally.

The hardened concrete contains interconnected air voids totalling approximately 15 to 25 percent.

It combines chemically with the water, forming strong crystals that bind sand and gravel together in the hardened concrete.

The bunkers, made of hardened concrete and earth, survived a fire in 1977, so the laboratory was fairly confident there would be no problems this time.

Snatching her hand back, Molly watched the naked woman sink to chin, to nose, to brow, as though drowning in hardened concrete.

Working out with railroad ties and buckets of hardened concrete, he became a pioneer in a sport then considered esoteric and often misunderstood.

This can slowly hydrate to Mg(OH) with expansion in the hardened concrete, causing cracking.

Oil the inside surfaces of the form boards (the sides that will touch the concrete) to prevent the boards from sticking to the hardened concrete.

While hardened concrete appears solid, it is porous, having small capillaries resulting from the evaporation of water beyond that required for the hydration reaction.

With drilling done through the tread, the tires would be connected or built up in layers by linking the reinforcing rods sticking out of the hardened concrete.

The air bubbles are created during mixing of the plastic (flowable, not hardened) concrete, and most of them survive to be part of the hardened concrete.

On an episode of MythBusters, experiments were done to see if dynamite can be used to clean out hardened concrete from inside of a mixer truck, with limited practical results.

The potassium salt is used in the production of porceleins, the magnesium salt for hardened concretes and as an insecticide, and the barium salts for phosphors.

Zale calmly felt for a pulse, and finding none, he tied a rope around Wong's ankles that was attached to the boat's anchor, a large tin can filled with hardened concrete.

FEW building materials seem so fundamentally unworkable as hardened concrete, which may explain why many amateurs forgo trying to repair it themselves and sometimes doubt that it can be repaired even by a professional.

A wide, flat board can be laid on top of the partly hardened concrete so that you can kneel on it while working if the walk or patio is too wide to reach all parts from outside the form boards.

The primary purpose of air entrainment is to increase the durability of the hardened concrete, especially in climates subject to freeze-thaw; the secondary purpose is to increase workability of the concrete while in a plastic state.

If the truck breaks down or for some other reason the concrete hardens in the truck, workers may need to enter the barrel with jackhammers; dynamite is still occasionally used to break up hardened concrete in the barrel under certain circumstances.