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305-AggregatesLab-20101025

# 305-AggregatesLab-20101025 - CEEn 305B Civil Engineering...

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CEEn 305B Civil Engineering Materials—Concrete, Masonry, and Asphalt Department of Civil and Environmental Engineering Brigham Young University INSTRUCTIONS FOR AGGREGATES LABORATORY ACTIVITY: GRADATION SPECIFICATIONS The purpose of this laboratory activity is to familiarize you with aggregate specifications and give you experience with calculations associated with particle-size distributions and moisture contents in general accordance with American Society for Testing and Materials (ASTM) C136 (Standard Test Method for Sieve Analysis of Fine and Coarse Aggregates). 1. Review the principles in Chapter 5 of the textbook in preparation for designing your aggregate gradation. Your objective should be to determine a particle-size distribution that meets the specification given in Table 1, which is the Utah Department of Transportation specification for untreated base course (slightly modified for class use). 2. Calculate appropriate material weights (assuming oven-dry aggregate condition) to achieve a maximum dry density of 140 pcf for a 6-in.-diameter specimen approximately 4.6 in. in height. (The computed target weight should be about 10 lb.) Record the design weights in Table 2. 3. Compute the weight of water required to prepare specimen 1 at a gravimetric moisture content of 6.0 percent by weight of dry aggregate. You should select a moisture content for specimen 2 that is higher than that used for preparation of specimen 1 to facilitate observation of the effects of moisture on density and bearing capacity, but do not select a value higher than 8.0 percent (the mixture may be too wet to compact). Record the design water weights next to Table 2. The adjusted weights for both the aggregate and the water will be calculated later. Table 1. Gradation Specification Sieve Size Percent Passing (%) 3/4 in. 100 3/8 in. 78 - 92 No. 4 55 - 67 No. 16 28 - 38 No. 50 13 - 22

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Table 2. Weigh-Outs Design Water Weight for Specimen 1: ________lb Design Water Weight for Specimen 2: ________lb Adjusted Water Weight for Specimen 1: ________lb Adjusted Water Weight for Specimen 2: ________lb 4. Complete a laboratory reading report to be submitted at the beginning of the laboratory session in which you will complete this activity. (This form is available electronically in the “Labs” subfolder within the class group folder and is named, “305-LabReadingReport.pdf.”) Sieve Size Design Adjusted Weight (lb) Weight (lb) 1/2 in. 3/8 in. No. 4 No. 8 No. 16 No. 30 No. 50 Pan Total
CEEn 305B Civil Engineering Materials—Concrete, Masonry, and Asphalt Department of Civil and Environmental Engineering Brigham Young University INSTRUCTIONS FOR AGGREGATES LABORATORY ACTIVITY: CALIFORNIA BEARING RATIO TESTING The purpose of this laboratory activity is to provide you experience with weighing out, mixing, and compacting aggregate samples in general accordance with American Society for Materials and Testing (ASTM) D1557 (Standard Test Methods for Laboratory Compaction Characteristics

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305-AggregatesLab-20101025 - CEEn 305B Civil Engineering...

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