What is Ready-Mix Concrete?
Ready-mix concrete, as the name suggests, is a pre-prepared concrete mix. This preparation takes place on a specialized batching plant, under controlled conditions. This controlled mixing, often computerized. ensures accurate proportioning of concrete, water and aggregates. Moreover, getting ready-mix concrete in London reduces on-site labour and equipment needs, and ensures consistent quality control.
What Are the Common Mistakes Related to Ready-Mix Concrete?
It is not usually the big errors that cause concrete mix failures or costly setbacks. Sometimes, a minor, commonly ignored factor can make a big difference. Go through the list below to make informed decisions and avoid common errors causing you damage:
- Inaccurate Water and Aggregate Volume
- Improper Site Preparation
- Choosing the Wrong Concrete Strength
- Unaware of the Best Delivery Timings
- Inconsideration of the Pouring Time
- Not Giving Concrete Enough Curing Time
Inaccurate Water and Aggregate Volume
The standard mix ratio for concrete is 1:2:4 (1 part cement, 2 parts sand, 3 parts aggregate). Some low-quality companies alter this ratio to use less cement and more stones, cutting costs and compromising the concrete’s structural integrity.
Similarly, adding more water can make the mix easier to pour but compromises quality. When you add more water to the mix, it dilutes the cement paste and weakens the structure by making it more porous and easier to crack.
Improper Site Preparation
Site preparation plays an important role in ensuring successful ready-mix concrete performance. Concrete quality doesn’t matter if the site is loose, uneven, or has poor drainage with no membrane (separation layer). Poor site quality leads to uneven slabs, cracking, and driveways collapsing over time. For reliable sub-base preparation, ensure the site has compact hardcore, uniform depth, a damp-proof membrane, and proper drainage.
Choosing the Wrong Concrete Strength
Every project has different requirements. The wrong concrete grade compromises the durability and structural integrity of your structures and adds unnecessary costs. Residential foundations typically go with a C25/C30 concrete mix. Whereas commercial structures go up from a C35 concrete mix ratio to higher grades.
Unaware of the Best Delivery Timings
Know your place and calculate the best time for timely delivery and efficient work. Poor time management can lead to concrete quality issues and traffic-related delays. Schedule delivery timings during off-peak hours. For example, in London, 7-9 AM or 2-4 PM are off-peak hours. This will help you get your ready-mix concrete delivered on time.
Additionally, booking your delivery beforehand keeps the supplier informed and prepared. If you need same-day urgent deliveries, confirm your exact address and contact number, and note any site restrictions in advance to avoid delivery issues.
Inconsideration of the Weather Conditions
Another common issue is pouring concrete without considering weather conditions. If the weather is too cold, the concrete will freeze before it sets, resulting in internal damage. If the weather is too hot, it speeds up curing, leading to a cracked surface. Similarly, pouring concrete mixes during a rainy season is risky, too, as it takes 24-48 hours to set.
Not Giving Concrete Enough Curing Time
Curing concrete involves continuous hydration and weather protection. Typically, it needs at least 7 days of curing and reaches its optimal strength after 28 days. So if your concrete dries on the first day, don’t assume it is ready for use.
If curing is rushed or not done properly, it may lead to surface cracking, dusting, scaling, increased permeability, and reduced strength. To ensure your concrete structures reach optimal strength, keep the surface damp for 28 days using curing compounds.
Conclusion
When working with ready-mix concrete, you should not leave everything on the supplier. Plan every step properly, considering the weather and site conditions. Prepare the site before the concrete arrives. Make sure your supplier knows the concrete grade and site location to ensure accuracy and timely delivery. And give your concrete enough time to cure before putting it into use. If the weather conditions do not seem suitable, wait till it is favourable for your concrete mix. Take your time and don’t rush when working with concrete mixes.
Also Read: Mansard or Dormer: Which Loft Conversion Does Your London Roof Allow
