Does Aggregate Size Impact Concrete Strength?

The size of the coarse-grained aggregate has a direct impact on the strength and workability of concrete. It is important to balance these two factors when selecting an appropriate aggregate size. Cook observed that the difference in compressive strengths due to aggregate size increases with a decreasing water-cement ratio and an increasing test age. Smaller coarse-grained aggregate also increases the flexural strength of concrete.

The tensile strength of concrete is severely affected by the increase in aggregate size. Dzhavakhidze found that when the maximum grain size is increased to 120-180 mm, the reduction in tensile strength is 30 to 50% compared to concretes with a maximum aggregate size of 20 mm. This is due to the inter-official transition zone, which is a weak zone surrounded by aggregates that are more susceptible to cracking. The largest concrete aggregate pieces in the mix can range from small, smooth chunks to large, jagged chunks.

Coarse-aggregate mixes tend to stay in the 1% absorption range when mixed with the right amount of moisture to set the concrete. When designing concretes with given strength and deformation properties, aggregate roughness is one of the most important technological parameters. In addition, parts can segregate during the drying and curing process, leaving weak spots throughout the concrete. By increasing the efficiency in the use of cement in concretes working in compression, there is a reduction in deformation and an increase in Young's modulus and unit weight of concrete. When selecting a suitable aggregate size, it's important to balance workability with strength to find the perfect mix.

To contact a concrete aggregate supplier in Arkansas, contact Razorback Concrete at 870-455-0700 for a free aggregate quote.

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