What happens to void content and paste content when well-graded aggregates are combined?

When well-graded aggregates are combined, the void content decreases, while the paste content typically increases. Well-graded aggregates consist of a range of sizes that fit together more efficiently than poorly graded aggregates, which have limited size distribution. This efficient packing reduces the amount of void space between the aggregates, leading to a decrease in void content.

As the void content decreases, more paste (which consists mainly of cement and water) is necessary to fill the reduced void spaces effectively and ensure proper bonding between the aggregates. This results in an overall increase in the paste content as compared to when poorly graded aggregates are used. Therefore, the answer describing both aspects correctly is that the void content decreases and the paste content increases.