STUDY

The Use of Safetysorb™ Zeolite as a Pozzolan

LIGHT WEIGHT CEMENT AND AGGREGATE

A pozzolan is a “siliceous or siliceous and aluminous material, which in itself possesses little or no cementitious value but will, in finely divided form and in the presence of moisture, chemically react with calcium hydroxide at ordinary temperatures to form compounds possessing cementitious properties” (ASTM)

Cement consists of three types of materials; (1) limestone (CaCO3), (2) aluminum silicate (clay or shale), and (3) inert materials such as sand and gravel. The limestone and clay are fired together in a rotary kiln. The limestone decomposes to lime (CaO) which reacts with the clay or shale to form “clinker”. Clinker consists of tricalcium silicate, dicalcium silicate, tricalcium aluminate, and tetra calcium aluminate ferrite. The clinker is finely ground generally in a ball mill to make “cement”.

In “Portland-pozzolan” cement 15 to 40% of the cement can be replaced by zeolite which is a pozzolan.

BENEFITS

• INCREASED COMPRESSIVE STRENGTH due to the porous crystalline structure and high surface area of the zeolite, the hydrated phases of lime pozzolan are enhanced and this increases the compressive strength.
• DECREASES ALKALI-SILICA EXPANSION. allows the use of clinkers with more than 0.60% Na2O. (Limit of ASTM description).
• HELPS RESIST UNDERWATER CORROSION
• POWER SAVINGS The production of 1 kg of clinker requires 900 Kcal of energy.
• IMPROVED CHEMICAL RESISTANCE especially in salt water applications
• DECREASE INSTABILITY CAUSED BY EXCESS LIME IN THE SET CEMENT

LIGHTWEIGHT CEMENT

LIGHTWEIGHT AGGREGATE

PRODUCT DESCRIPTION