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Texstar Enterprises, Inc

17090 Jordan Road
Selma, Texas 78154

Phone: 210.656.8775
Fax: 210.656-6441


Frequently Asked Questions Concrete

What is the difference between cement and concrete?

Although the terms cement and concrete often are used interchangeably, cement is actually and ingredient of concrete. Concrete is basically a mixture of aggregates and paste. The aggregates are sand and gravel or crushed rock; the paste is water and Portland cement. Concrete gets stronger as it gets older. Portland cement is not a brand name, but the generic term for the type of cement used in virtually all concrete. Through a process called hydration, the cement and water harden and bind the aggregates into a rocklike mass. This hardening process continues for years, meaning that concrete gets stronger as it gets older.

Can it be to cold or to hot to pour new concrete?

Temperature extremes make it difficult to properly cure concrete. On hot days, too much water is lost by evaporation from newly placed concrete. If the temperature drops too close to freezing, hydration slows to nearly a standstill. Under these conditions, concrete ceases to gain strength and other desirable properties. In general the temperature of new concrete should not be allowed to fall below 50 degrees Fahrenheit.

Why does concrete crack?

Concrete, like all other materials will slightly change in volume when it dries out. In typical concrete this change amounts to about 500 millionths. Translated into dimensions, this is about 1/16 of an inch in 10 feet. The reason the contractor puts joints in concrete pavements and floors is to allow the concrete to crack in a neat, straight line at the joint when the volume of the concrete changes due to shrinkage.

What is 3000 pound concrete?

It is concrete that is strong enough to carry a compressive stress of 3000 psi at 28 days. Concrete may be specified at other strengths as will. Conventional concrete has strengths of 6,000 psi or less; concrete with strengths between 6,000 and 20,000 psi is considered high-strength concrete.

Will concrete harden under water?

Portland cement is a hydraulic cement which means that it sets and hardens due to a chemical reaction with water. Consequently, it will harden under water.

What is flowable fill?

Flowable fill is a self-compacting low strength material with a flowable consistency that is used as an economical backfill. It is a self leveling material and can be placed with minimal effort and does not require vibration or tamping.

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