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From page 60... ... B-1 These proposed test methods are the suggestions of the NCHRP Project 18-13 research team. These test methods have not been approved by NCHRP or any AASHTO committee nor formally accepted for the AASHTO Specifications. Read the entire page →
From page 61... ... B-2 Proposed Method of Test for Determination of the Foam Index of a Coal Fly Ash and Portland Cement Slurry 1. SCOPE This test method is for the determination of the foam index of a mixture of coal fly ash, portland 1.1. Read the entire page →
From page 62... ... B-3 4. SUMMARY OF TEST METHOD The foam index test is used to estimate the effect of a specific coal fly ash on the air entrainment 4.1. Read the entire page →
From page 63... ... B-4 7. MATERIALS Coal Fly Ash -- a grab sample, regular sample, or composite sample as described in C311, Sections 7.1. Read the entire page →
From page 64... ... B-5 8.1.1.9 If the stable foam is achieved within a total test time of 12 to 18 min, record the total number of drops of air-entraining admixture solution added to achieve a stable foam (ND cement) , the solution concentration of the air-entraining admixture solution used (CS cement) Read the entire page →
From page 65... ... B-6 Figure 2. Protocol for conducting the foam index test and establishing the optimum AEA solution concentration to achieve an endpoint in 15 ± 3 min. Read the entire page →
From page 66... ... B-7 9. CALCULATION The results of the foam index test can be expressed many different ways. Read the entire page →
From page 67... ... B-8 11. PRECISION AND BIAS Precision -- A precision statement for this test has not yet been established. Read the entire page →
From page 68... ... B-9 Proposed Modifications to ASTM D4607 for Determining the Iodine Number for Coal Fly Ash The following are proposed modifications to ASTM D4607, Standard Test Method for Determination of Iodine Number of Activated Carbon, necessary for the determination of the iodine number for coal fly ash. It is proposed to replace several sections in ASTM D4607 with new sections; the proposed new sections are shown below. Read the entire page →
From page 69... ... B-10 4.3. The presence of adsorbed volatiles, sulfur, and water extractables may affect the measured iodine number of an activated carbon in coal fly ash. Read the entire page →
From page 70... ... B-11 mass of boiling solution should be at least four times that of the coal fly ash to be treated to ensure the availability of enough HCl to remove all sulfur and acidify the fly ash. The coal fly ash is then filtered using Grade 1, 90 mm diameter, cellulose, qualitative filter paper, or any equivalent filter paper, and dried at 103°C to a constant weight. Read the entire page →
From page 71... ... B-12 sodium thiosulfate solution (Step 10.1) until the solution is a pale yellow. Read the entire page →
From page 72... ... B-13 Figure 1. Example of iodine adsorption isotherm for coal fly ash. Read the entire page →
From page 73... ... B-14 Proposed Method of Test for Determination of Air-Entraining Admixture Adsorption by Coal Fly Ash 1. SCOPE This test method covers the determination of the quantity of air-entraining admixture (AEA) Read the entire page →
From page 74... ... B-15 describes the correlation between solid phase (coal fly ash) capacity and the equilibrium airentraining admixture aqueous phase concentration. Read the entire page →
From page 75... ... B-16 composition and Blaine fineness may be substituted, but the performance of the air-entraining admixture predicted by this test method may vary. Air-Entraining Admixture -- Select the specific air-entraining admixture to be used with the coal 8.3. Read the entire page →
From page 76... ... B-17 Transfer the filtrate to a graduated cylinder and determine the volume of filtrate in liters (L) Read the entire page →
From page 77... ... B-18 Determine the COD of the final solution and record this as CODPC* Read the entire page →
From page 78... ... B-19 Figure 1. Example of direct adsorption isotherm for coal fly ash. Read the entire page →
From page 79... ... B-20 13. REPORT Report the following information 13.1. Read the entire page →

From page 60...

... B-1 These proposed test methods are the suggestions of the NCHRP Project 18-13 research team. These test methods have not been approved by NCHRP or any AASHTO committee nor formally accepted for the AASHTO Specifications.