In concrete slabs, the nominal maximum size should not exceed three-fourths of the minimum clear spacing of reinforcing bars or one-third of the section depth (ACI 302.1R). The commentary R26.4.2.1(a)(5) of ACI 318-19 states that the size limitations on aggregates are provided to facilitate placement of concrete around the reinforcement without ...

Sieve sizes commonly used for concrete aggregates are detailed in Table 1, and various physical properties of normalweight aggregates, with typical range values, are shown in Table 2. Coarse and fine aggregates are generally sieved separately. That portion of an aggregate passing the 4.75 mm (No. 4)

Does the nominal maximum size of the aggregate affect the strength at a given cementitious material content? A. As the nominal maximum size of the aggregate is increased, the amount of water needed for the same workability is reduced.

In general, a decrease in the maximum coarse aggregate size may have advantages when it comes to concrete compressive strength: “internal weak planes may be less likely to exist, and the smaller particles reduce stress concentration effects at paste-aggregate interfaces.”1 Also, smaller-sized aggregate having a higher surface area

The larger the maximum aggregate size or aggregate content, the higher the internal cracking and the loss of strength after 5 hr exposure to evaporation: 21, 12 and 5 percent, for concretes with maximum aggregate size of 3/4, 1/2 and 3/8 in., respectively.

The nominal maximum size of an aggregate is the smallest sieve opening through which the entire amount of aggregate is permitted to pass. Hence, a 4 x 8 in. (100 x 200 mm) can be specified if no aggregate used for making the concrete cylinder is retained on a …

Publication: Concrete International. Volume: 31. Issue: 6. Appears on pages(s): 75-76. Keywords: DOI: Date: 6/1/2009. Abstract: Maximum Size versus Nominal Maximum Size: The specification I prepared for a project calls for “Maximum coarse aggregate size to be 1 in. nominal.”

A one-cycle freezing test was used to demonstrate the effect of maximum size of aggregate on the frost resistance of concrete at a variety of water-cement ratios and degrees of saturation.

Sep 1, 2022 · Nominal maximum aggregate size (MAS) and particle distribution affect the performance of concrete significantly. However, their effect is influenced by the type of aggregate and the target concrete strength.

Sep 1, 2011 · The test results showed that the shear strength of lightweight concrete (LWC) continuous beams increased with the maximum aggregate size, though the increasing rate was lower than that of normalweight concrete (NWC) continuous beams.