98 BULLETIN 949, U. S. DEPARTMENT OF AGRICULTURE. 



TENTATIVE TESTS. 



Page. 



39. Proposed soundness test for coarse aggregate. . .. „.„„,,. 62 



40. Tentative test for absorption of concrete 62 



41. Proposed test for percentage of shale in gravel 62 



42. Proposed modification of the abrasion test for broken stone and slag 62 



43. Proposed abrasion test for fine aggregate 62 



44. Proposed field methods of making sieve analysis 63 



45. Proposed field determinations of clay and silt 64 



46. Proposed methods of fabricating and testing compression field specimens of 



concrete 64 



47. Proposed methods of making test specimens of concrete in the laboratory. . 65 



48. Proposed transverse tests of concrete 66 



49. Proposed test for consistency of concrete 66 



50. Determination of percentage of pigment in paints 68 



51. Tests for the amount of spelter coating on culvert metal 68 



RECOMMENDED STANDARD METHODS FOR SAMPLING. 



52. Broken stone 69 



53. Broken slag 69 



54. Stone block 70 



55. Gravel 70 



56. Sand 71 



57. Semigravel, top soil, and sand clay 72 



58. Bituminous materials 73 



59. Portland cement 74 



60. Paving brick 74 



61. Metal culverts 74 



62. Paint and paint materials 74 



MISCELLANEOUS. 



63. List of apparatus for conducting tests of bituminous materials for road 



construction 75 



64. List of apparatus for physical testing of nonbituminous road materials 75 



65. The manufacture of a diamond core drill 76 



66. Forms for reporting tests 79 



67. Comparison of degrees Baume and specific gravity 94 



68. Comparison of Centigrade and Fahrenheit degrees 94 



69. Metric conversion table 95 



70. References to tests for paint and paint materials, sewer pipe, drain tile, and 



metals 95 



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