When it comes to constructing buildings, two main types of concrete are commonly used: site mix concrete and ready mix concrete. In this discussion, we’ll delve into the disparities between these two concrete variants.
Concrete, a widely used construction material, is a composite blend of inert particles like sand and gravel, bound together by cement and water. Cement, a primary binding agent, plays a pivotal role in creating the concrete structure. There are various types of cement available, each serving specific needs.
Concrete boasts high compressive strength, resistance to rust, gradual hardening, and a surface that can withstand abrasion. Despite its weakness in tension, steel reinforcement can be used to counteract tensile loads. Additionally, concrete is cost-effective compared to steel construction.
A well-prepared concrete mix is fundamental for a robust infrastructure. Achieving the right mix involves meticulous planning, considering the physical attributes of each ingredient, and assessing the site’s bearing capacity.
1. Water Cement Ratio : The ratio of water to cement directly influences the mix’s workability and strength. A higher water-cement ratio increases workability but decreases strength.
2. Heat-Release : Concrete mixes must consider the heat generated during chemical processes to prevent rapid fading without causing shrinkage or cracking.
3. Grade of Concrete : The chosen grade depends on the intended use of the concrete.
4. Size of Aggregates : Quality scaling of aggregates is crucial for the mix’s physical attributes.
5. Workability : A mix’s ability to consolidate and be properly placed determines its workability.
6. Reliability : Identified by slump values, reliability assesses the slump and mobility of concrete mixes.
7. Durability :Resistance to environmental variations ensures concrete durability.
8. Density : Concrete mixtures are categorized based on their intended use and density.
Site mix concrete, also known as on-site or manual mix concrete, is prepared at the construction site. It requires precision in component proportions and diligent attention to avoid quality issues.
Advantages of Site Mix Concrete
Disadvantages of Site Mix Concrete
Ready-mix concrete is manufactured in a plant and delivered in a plastic state ready for use. It offers advantages in terms of quality, efficiency, and convenience.
Advantages of Ready Mix Concrete
Disadvantages of Ready Mix Concrete
| Factors Under Consideration | Site Mix Concrete | Ready Mix Concrete |
|---|---|---|
| Time | Slower procedure due to multiple processes. | Delivered ready to use, saving time. |
| Equipment | Requires on-site weight batch mixer. | No on-site equipment needed. |
| Weigh Batching | Manual weighing. | Computerized weighing. |
| Selection of Materials | Client responsibility. | Responsibility of RMC supplier. |
| Distribution | Must be mixed at the point of use. | Convenient delivery to multiple places. |
| Application | Suitable for low-rise structures. | Ideal for high-rise structures. |
| Storage Requirements | Requires controlled storage for materials. | No need for additional raw material space. |
| Waste | Some wastage during storage and mixing. | Minimal material wastage on-site. |
| Quality | Continuous supervision needed. | Consistent quality in an automated setting. |
| Manpower Needs | More man-hours required on-site. | Skilled workers needed for placement. |
| Material Takeoff | Independent material estimation. | Considered as a single item. |
| Batch Size | Difficult to mix large amounts on-site. | Large amounts can be delivered. |
| Site Location | Requires transportation of materials. | Batching facility location affects quality. |
While ready-mix concrete may be costlier, its higher quality and consistency often make it a preferable choice, especially for large projects. Site mix concrete, on the other hand, is suitable for smaller projects and renovations. The choice between the two depends on project requirements and logistical considerations.
