GP Cement vs. Builders Cement: Which One Should You Choose?
When tackling a landscaping or construction project, choosing the right type of cement is crucial for ensuring durability and strength. Two of the most commonly used types are GP Cement (General Purpose Cement) and Builders Cement.
While both are used in concrete, mortar, and general construction applications, they are also essential for various landscaping projects such as garden edging, retaining walls, and pathways.
However, they differ in setting time, strength, and workability. Understanding their similarities and differences can help you select the best option for your needs.
What Is GP Cement?
GP Cement is a versatile cement commonly used for a wide range of general construction projects. It is designed for applications where a reliable, cost-effective, and strong cement is needed.
Key Features of GP Cement
- Faster Setting Time: GP Cement sets more quickly, making it ideal for projects that require a fast turnaround.
- Balanced Strength: It provides a strong mix of both early and long-term strength.
- Cost-Effective: More affordable than specialty cements.
- Wide Applications: Suitable for concrete slabs, pathways, driveways, fence posts, and garden edging.
What Is GP Cement Used For?
GP Cement is great for:
- Creating concrete slabs for patios or walkways.
- Fixing fence posts and garden beds.
- General-purpose repairs and light construction tasks.
How to Mix GP Cement
To achieve the best results, follow these mixing guidelines:
- Prepare Materials: Use a standard ratio of 1 part cement, 2 parts sand, and 4 parts aggregate for general concrete work.
- Add Water Gradually: Mix until you get a workable, smooth consistency.
- Use Immediately: GP Cement sets quickly, so work efficiently to place it before it hardens.
How Long Does GP Cement Take to Set?
GP Cement typically sets within 30 to 60 minutes, depending on weather conditions and moisture levels.
How Many Bags of GP Cement per m³?
For standard concrete mix, you’ll need approximately 16-20 bags of GP Cement per cubic meter of concrete.
GP Cement Ratio
GP Cement is ideal for brick mortars and wall renders. The following table outlines recommended mixing ratios (by volume). Note: This is a general guide. Always seek specific advise for your project.
Admixtures like air entrainers, thickening agents, or plasticisers should be used according to the manufacturer’s recommendations.
| Material Type | GP Cement | Sand | Lime |
| High Durability Mortar (e.g. retaining walls) | 1 | 3 | 0 - 0.25 |
| Maximum Bond Mortar (e.g. structural brickwork) | 1 | 4.5 | 0.5 |
| General Purpose Mortar | 1 | 6 | 1 |
| Wall Render | 1 | 3 | 0 |
For further assistance, contact Cement Australia’s Customer Support Services: 1300cement@cemaust.com.au
What Is Builders Cement?
Builders Cement is specially formulated for applications requiring extended workability and superior long-term strength. It’s a preferred choice for professionals working on large-scale or detailed projects.
Key Features of Builders Cement
- Slower Setting Time: Takes longer to set, allowing more time for adjustments and finishing.
- Superior Long-Term Strength: Offers enhanced durability over time.
- Improved Workability: Easier to mix and handle for intricate projects.
- Optimised for Professionals: Used in brickwork, blockwork, and detailed structural projects.
What Is Builders Cement Used For?
Builders Cement is best suited for:
- Laying bricks and blocks for walls or retaining structures.
- Constructing large concrete footings or foundations.
- Projects in hot weather conditions where extended working time is needed.
- Precision tasks like mortar for bricklaying.
For a typical mortar mix, use the following ratio:
- 1 part Builders Cement to 4 parts sand (adjust as needed for different applications).
- Gradually add water while mixing until a smooth consistency is achieved.
Builders Cement Ratio
The following table gives a guide to the proportions (by volume) to be used (Note: This information is a guide only, specific advice for your project should be obtained for the materials you are using.)
Additives such as air entrainers, thickening agents or plasticisers can be used but should always be used in accordance with the manufacturers recommendations.
| Application | Cement | Sand | Aggregate | 20kg Bags per m³ |
|---|---|---|---|---|
| Concrete – Improved Water Tightness | 1 | 1.5 | 3 | 17 |
| Concrete – Paths and Driveways | 1 | 2 | 3 | 16 |
| Concrete – Foundations, Footings | 1 | 3 | 3 | 13 |
| Mortar (General Purpose) | 1 | 4 | - | 15 |
| Mortar (Enhanced Workability) | 1 | 6 +1 hydrated lime |
- | 8 |
| Render | 1 | 3 | - | 20 |
Key Differences Between GP Cement and Builders Cement
| Feature | GP Cement | Builders Cement |
|---|---|---|
| Setting Time | Faster setting for quick projects | Slower setting for extended workability |
| Strength | Balanced early and long-term strength | Superior long-term strength |
| Applications | General-purpose jobs like slabs and posts | Bricklaying, blockwork, and structural projects |
| Workability | Less time for adjustments | Extended time for precise adjustments |
| Cost | More affordable | Slightly more expensive due to added features |
Which Cement Should You Choose?
- Choose GP Cement if you’re working on smaller, time-sensitive projects like driveways, pathways, or garden fixtures. It’s also a great option for general-purpose repairs where speed and cost-effectiveness are priorities.
- Choose Builders Cement for larger, more intricate projects where you need extra time to work with the mix. It’s the go-to option for professionals tackling brickwork, blockwork, or large foundations, especially in hot weather conditions.
Understanding the differences between GP Cement and Builders Cement ensures you select the right material for your project’s requirements. While GP Cement is a versatile and cost-effective choice for quick jobs, Builders Cement’s slower setting time and superior strength make it ideal for more demanding tasks.
Still unsure which cement to choose? Contact RockMate Landscape Supplies today for expert advice and high-quality cement products tailored to your project’s needs!