为探讨因《水工混凝土砂石骨料试验规程》修订更新导致新旧版本试验规程所推荐的石粉含量试验检测方法变化对试验检测结果的影响,结合黄登水电站工程实际,开展了不同试验检测方法对灰岩人工砂石粉含量检测结果的影响程度及规律试验研究,试验共检测灰岩人工砂石粉含量535组。试验结果表明:①试验检测方法对灰岩人工砂石粉含量检测结果影响显著,且具有一定规律性;②采用“湿筛水洗法”与“颗粒级配干筛法”得到的石粉含量结果差值和“湿筛水洗法”得到的微粒含量结果数据分布情况基本满足正态分布曲线;③采用2种试验方法检测的常态砂和碾压砂石粉含量结果差值分别为5%~9%和4%~8%,平均差值分别为6.7%和5.2%;④灰岩常态砂和碾压砂微粒含量在石粉含量中所占比例基本相同,约为石粉含量的80.4%。

Test methods for stone powder content (hereafter referred to as SPC) are quite different between the 2001 version and 2014 version of Code for testing aggregates of hydraulic concrete. In order to investigate the influence of method change on SPC test results, we detected 535 groups of artificial limestone powder (hereafter referred to as ALP) from Huangdeng hydropower station by different test methods. Results indicate that the measured values of ALP are quite different by different SPC test methods, and the influence of test method is of some regularity. The deviations in SPC test results obtained by wet screening & washing method and dry-sieve method accord with normal distribution, and the measured values of micro-particle content of ALP by wet screening & washing method also follows normal distribution. Moreover, the deviations in ALP test results obtained by the two methods in normal concrete mainly varies from 5% to 9%, with the mean value of 6.7%; as for roller compacted concrete, the interval is from 4% to 9%, and the mean value is 5.2%. In addition, the proportions of micro-particle content in ALP in normal concrete and roller compacted concrete are identical in general, approximately accounting for 80.4% of SPC.