Q1: What cement should I use to level the floor under my garage door?
A1: Use a high-strength Portland cement (CEM I) to resist traffic and abrasion. Keep it moist for a few days after application to ensure full strength.
Q2: What is the difference between Blue Circle General Purpose Cement and Blue Circle Mastercrete?
A2: General Purpose Cement (CEM II) is suitable for most uses. Mastercrete has added limestone and special additives for better workability and freeze-thaw resistance. It’s also eco-friendly, packed in plastic bags.
Q3: What is the difference between cement and concrete?
A3: Cement is an ingredient in concrete, which is made by mixing cement, gravel, sand, and water. Mortar, meanwhile, is a mix of cement, sand, and water.
Q4: Can my cement still be used once it has passed its use-by date?
A4: We advise against using cement after its use-by date. The expiration is tied to health and safety regulations concerning chromium VI, which can cause skin irritation or allergic dermatitis. After the expiration date, we cannot guarantee the levels of chromium VI will meet legal safety standards. Please refer to the product's safety data sheet for more information.
Q5: What cement should I use for concrete exposed to sea water?
A5: For concrete exposed to sea water, Blue Circle Sulfacrete (CEM II/B-V +SR) is recommended. It becomes more impermeable over time and provides better resistance to the chlorides in sea water. To protect the concrete, ensure a low water/cement ratio (below 0.55) and high strength (C30 or above), and always cure it properly to develop full resistance to seawater penetration. For reinforced concrete, seek specialist advice.
Q6: Are there different types of cement?
A6: Yes, various types of cement are available, each with unique properties and uses. Some of the types we offer include:
Q7: Which cement is best for brickwork?
A7: Natural Hydraulic Lime 5 (NHL 5) is ideal for brickwork, including stone, brick, and block laying, as well as rendering and plastering. It's perfect for restoration and conservation projects due to its whiteness and flexibility.
Q8: How can I remove stains from slabs?
A8: To remove stains, flush and scrub the area immediately. For persistent stains, use physical abrasion or a mild brick-cleaning acid, but test in a small area first to avoid damage.
Q10: What are admixtures and how do I use them?
A10: Admixtures are added to cement mixes to change their properties. Common types include:
Q11: Can I still use cement if it has lumps or has hardened?
A11: No, you should not use cement that has developed lumps or hardened. Lumpy cement will not mix evenly, and it may not achieve the required strength, compromising the quality of your project.
For any additional questions or to place an order, please contact our customer service team at Trade Superstore Online.
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