![]() Utes should be considered as an alternative to the standard Time for QA purposes, soaking aggregate samples for 10 min. Not statistically different from those measured according to Comparison of test methods for determining specific gravity and absorption of aggregate. Manual 2 days 2 hrs $500 Low equipment cost, somewhat Good Auto 1 day 1 hr $7,000 Repeatability and reproducibility Manual 2 days 2 hrs $500 Questionable accuracy for ID Test Method Comments on Accuracy Equipment Method (similar to the one described in AASHTO T 209) were The Gsb and Gssd results for the coarse and fine aggregatesĭetermined using the 5- and 10-minute vacuum-soaking Was a better alternative to the standard oven-drying method. That testing the aggregate in its in-situ moisture condition Highly absorptive materials such as BF slag coarse aggregateĪnd recycled concrete. The vacuum-drying method using the CoreDryĭevice was promising, but it was not able to completely dry Instead of using the standard oven-ĭrying method, the aggregate sample can be dried usingĪ vacuum-drying method or tested in its in-situ moistureĬondition. Ing aggregate to reduce the testing time for AASHTO T 85Īnd T 84 were evaluated. In Experiment 3, alternative methods for drying and soak. Investigate the time-zero reading for Phunque methods. Methods in AASHTO T 85 and T 84 to reduce the testing time.Įxperiment 4 was conducted to determine the effect of P200 onĪASHTO T 84 test results. To evaluate modifications relative to the drying and soaking Program to answer specific questions related to the test pro-Ĭedures previously evaluated. In addition, since the P200 portion of fineĪggregate is not tested in the Modified AASHTO T 84, it mayīe assumed to have the same specific gravity as the other fineĪggregate portion, or it can be tested according to ASTM C110Īfter reviewing the results of Experiments 1 and 2,Įxperiments 3, 4, and 5 were added to the laboratory testing Quality assurance (QA) purposes where results are desired as Ing days to complete, which hinders the use of these tests for However, the AASHTO T 85 and ModifiedĪASHTO T 84 (removal of P200) can take up to three work. RuggednessĪnd round robin studies for SSDetect were completed underĪ previous study. That can be completed within one working day. Measuring specific gravity and absorption of fine aggregate.Īmong the three test methods, SSDetect is the only one Modified AASHTO T 84 and SSDetect methods be used for Specific gravity and absorption of coarse aggregate and the Was recommended that AASHTO T 85 be used for measuring Based on the findings of Experiment 2, it More reasonable balance of accuracy and precision than the SSDetect and Modified AASHTO T 84 methods provided a For the four methods for testing fine aggregate, the Of the two test methods evaluatedįor use with coarse aggregate, AASHTO T 85 provided better Table 6-1 provides a comparison of the six test methodsĮvaluated in Experiment 2. The P200 fraction, and the poor precision of the Phunque Repeatability of SSDetect not being improved by removing ![]() Of additional costs of the CoreLok equipment and bags, the Test methods were not further evaluated in this study because Selected for further evaluation in Experiment 2. Methods selected at the conclusion of Experiment 1 with aĪt the conclusion of Experiment 1, six test methods were To compare results and variability of the selected test methods.Įxperiment 2 was conducted to further evaluate the test Experiment 1 was a preliminary evaluation Planned in two experiments, but it was later expanded intoįive experiments. The selected test methods were evaluated through a labo. Methods were selected for further evaluation in this study. Of precision, ruggedness of equipment, ease of use, soakingĪnd testing time, equipment cost, and potential problems or Ods were reviewed, and comparisons were provided in terms Methods with more complex, costly devices. Mining the SSD state in the standard test methods to new test Range from simple modifications to procedures for deter. There are also several modifiedĪnd new test methods for determining these properties these Gates are AASHTO T 85 (or ASTM C127) and AASHTO T 84 Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages.Ĭurrent standard test methods for determining the spe-Ĭific gravity and water absorption of coarse and fine aggre. Below is the uncorrected machine-read text of this chapter, intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text of each book. ![]()
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |