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The recommended sample size for assessing surface moisture in aggregate is indeed in the range of 500g-1000g. This size is suitable because it is large enough to ensure that the sample represents the bulk material adequately, capturing any variations in moisture content across different parts of the aggregate.

Using a sample size within this range allows for more accurate and reliable moisture determination, which is critical for quality control in construction and material testing. Smaller sample sizes may not provide enough material to assess the moisture content accurately, potentially leading to erroneous conclusions about the aggregate's properties. Larger sample sizes could be impractical, taking unnecessary time and resources without significantly improving accuracy.

Overall, selecting a sample size within the specified range balances representativeness, manageability, and the precision needed for effective moisture analysis. This knowledge is vital for professionals in materials testing and quality control processes in construction and related fields.