Can You Prepare Concrete Without Using Fine Aggregates?
Can You Prepare Concrete Without Using Fine Aggregates?
Yes, you cannot prepare concrete without using fine aggregates to make concrete you need sand, cement, and stone. You can’t make concrete with only sand and cement. Mixing sand and cement creates mortar.
Without aggregates like gravel and stone, you can’t make concrete. It’s the aggregate that gives concrete its high compressive strength. Without it, the material won’t be strong enough for structural projects like walls, foundations, and footings.
When you mix sand and cement with water you get a type of mortar. It’ll be very low in strength and too weak for structural applications. It’s also not a great material for binding brick and stone without hydrated lime. To make a strong mortar mix you need cement, sand, and some lime.
Which Shape Aggregates Are Good For Concrete?
Concrete is a compound composed of cement, aggregate, and water. Aggregate is typically regarded as an inert filler, accounting for 60 to 80% of the volume and 70 to 85% of the weight of concrete.
The form and texture of aggregate have a greater impact on the characteristics of new concrete than hardened concrete.
Smooth and rounded aggregate is more workable in concrete than rough angular or elongated material. The majority of natural sands and gravel from riverbeds or seashores are smooth and rounded, making them ideal aggregates.
Crushed stone generates angular and elongated aggregates with a greater surface-to-volume ratio and better binding properties, but requires more cement paste to form a workable combination.
Aggregate’s surface texture might be smooth or rough. While a clean surface improves workability, a rougher surface creates a stronger link between the paste and the aggregate, resulting in greater strength.
Why the SSD condition of is aggregates the best choice, especially in the proportioning of materials of a concrete mix design?
The saturation state of the coarse particles used during mixing is one of the primary parameters influencing the qualities of OPS concrete.
The influence of varied aggregate saturation conditions during mixing on the slump, compressive, flexural, and splitting tensile strength of OPS concrete was explored in this present study.
For the following reasons, the SSD state is the ideal choice as a reference state:
- It indicates the aggregate’s “equilibrium moisture” state in concrete; that is, the aggregate will neither absorb nor give up water to the paste.
- Aggregate moisture content in the field is substantially closer to the SSD state than the OD state.
- The displacement approach determines aggregate bulk specific gravity (BSG) more precisely in the SSD situation.
- Using the displacement technique, the moisture content may be determined directly from (BSG) readings.
How Do You Recycle Concrete Aggregates?
Concrete, whether contaminated or not, requires crushing and screening machinery to be broken down in order to produce reusable concrete aggregate. Whether polluted or not, the concrete must be broken down by crushers and screening equipment to produce reusable concrete aggregates.
Because waste concrete from buildings and streets contains steel bars and other reinforcing components, such impurities and contaminations must be removed during the crushing process.
In general, powerful crushing machinery can reduce old concrete to a thickness of 5mm-50mm. According to several research, the coarse recycled concrete aggregate may replace around 30% of natural crushed coarse aggregate without significantly affecting concrete performance.
Even after being crushed by crushers, waste concrete from construction and demolition includes a minor quantity of combustibles such as wood chips and plastic chips.
After crushing, sieving, and contaminant removal, the calcination and grinding step is applied to generate purer and more valuable recycled concrete aggregate.
