Boral Cement - FAQ

Boral Cement - FAW
Q. What is the difference between cement and concrete?
A. Although the terms cement and concrete are often used interchangeably, cement is actually an ingredient of concrete. Concrete is basically a mixture of aggregates and paste. The aggregates are sand and gravel or crushed stone; the paste is water and Portland cement. Portland cement is not a brand name, but the generic term for the type of cement used in virtually all concrete. Cement comprises from 10 to 15 percent of the concrete mix, by volume. Through a process called hydration, the cement and a portion of water react and harden into a rocklike mass.

Q. I currently buy cement in bags, but would like to buy in bulk. What do I need to do so?
A. In order to buy bulk cement, you will require a silo for our pneumatic tankers to pump the cement into.

Q. What are the requirements for a silo to be suitable for bulk cement?
A. The silo needs to be suitable for holding cement. It needs to be of sufficient size to accept full tanker loads of cement which are up to 28 tonnes, and have some additional capacity to maintain your production whilst your next load is being delivered. In addition to these basic requirements, Boral Cement requires that all cement silos be fitted with the following safety equipment: pressure relief valve & dust collector (both ducted to 1m of ground level), a high level alarm (with a test circuit & flashing light & siren), and a butterfly valve (connected to the high level alarm). Contact Boral Cement for detailed requirements.

Q. Is there any alternative to 20kg bags or bulk delivery?
A. Cement is also sold in one tonne Bulka Bags. They reduce the need for manual handling associated with 20kg bags, as they are handled using forklifts (or similar machines), but do not require a silo to be erected.

Bulka Bags are made to order, and as such require a lead time of approximately 5 working days to be produced and delivered. Bulka bags are not a suitable long term storage device for cements as they allow moisture to come into contact with the cement.

Q. What is the shelf life of cement?
A. As cement is likely to react with moisture or carbon dioxide in the air, it is considered that under normal storage conditions, cement shall remain useful for a period of 3 months from delivery. After this period, it is suggested that the cement be tested for an increase in Loss On Ignition and other tests as required.

Q. What is the difference between Blue Circle GP (General Purpose) & Blue Circle SL (Shrinkage Limited) Cements?
A. SL is a Special Purpose Shrinkage Limited cement, which is a tighter controlled product similar to General Purpose cement, and complies with AS3972 Type GP and Type SL specifications.

Q. What is the difference between Blue Circle GP (General Purpose) & Blue Circle GB (General Blended) Cements?
A. GP is Portland Cement and GB is a Portland Cement blended with a Supplementary Cementitious Material such as Ground Granulated Blast Furnace Slag or Flyash. In certain conditions, the Supplementary Cementitious Material gives additional benefits to Plastic and Hardened concrete.