What is the purpose of using starting blocks under the screed during paving?

• A. To regulate the temperature of the HMA
• B. To account for HMA compaction for elevation matching
• C. To prevent material from spilling
• D. To increase the speed of the paver

Answer: (B)

The purpose of using starting blocks under the screed during paving is to account for HMA (Hot Mix Asphalt) compaction for elevation matching. Starting blocks provide a precise elevation reference for the screed, ensuring that the asphalt is laid at the correct thickness as specified in the project plans. With the blocks in place, the paving crew can account for the compaction that will occur after the asphalt is laid. This is essential because, during compaction, the HMA will lose thickness; therefore, starting at the appropriate elevation allows for this reduction and helps achieve the desired final grade. By having this control, the paving is optimized to produce a smooth, even surface that meets the project's specifications.