. Bulletin of the Department of Agriculture. Agriculture; Agriculture. UNITED STATES DEPARTMENT OF AGRICULTURE 1? BULLETIN No. 537 # -Si i4£* Contribution from Office of Public Roads and Rural Engineering, r^l SZ&&SL LOGAN WALLER PAGE, Director. ^V^"^fe». Washington, D. C. PROFESSIONAL PAPER April 21,1917 THE RESULTS OF PHYSICAL TESTS OF ROAD- BUILDING ROCK IN 1916, INCLUDING ALL COM- PRESSION TESTS. By Prevost Hubbard, Chemical Engineer, and Frank H. Jackson, Jr., Assistant Testing Engineer. CONTENTS. Introduction 1 Crushing strength or compression test 1 Interpretation of r
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. UNITED STATES DEPARTMENT OF AGRICULTURE 1? BULLETIN No. 537 # -Si i4£* Contribution from Office of Public Roads and Rural Engineering, r^l SZ&&SL LOGAN WALLER PAGE, Director. ^V^"^fe». Washington, D. C. PROFESSIONAL PAPER April 21,1917 THE RESULTS OF PHYSICAL TESTS OF ROAD- BUILDING ROCK IN 1916, INCLUDING ALL COM- PRESSION TESTS. By Prevost Hubbard, Chemical Engineer, and Frank H. Jackson, Jr., Assistant Testing Engineer. CONTENTS. Introduction 1 Crushing strength or compression test 1 Interpretation of results of physical tests 2 Table I.—Results of physical tests of road- building rock in 1916 3 Table II.—Results of compression tests of rock to January 1,1917 17 Table III.—Geographical distribution of rock samples tested to January 1,1917 22 Table IV.—General limiting test values for broken stone 23 INTRODUCTION. This bulletin should be considered as a supplement to United States Department of Agriculture Bulletin 370, which gives the results of the more common physical tests of some 3,650 road- building rock examined by the Office of Public Roads and Rural Engineering to January 1, 1916. The office tested 396 samples of rock in 1916, the results of which tests are given in Table I, the rocks being classified according to their location. It should be noted that in a number of cases, in addition to other tests, the crushing strength of the rock also is given. This test is not made ordinarily when ex- amining rock to determine its suitability for use in various types of broken-stone roads. The test is employed often, however, when considering a rock for use in the manufacture of paving block, and as many requests for records of the crushing strength of various rocks have been received in the past year, it has been thought advis- able to give in Table II a complete record of all of the crushing- strength tests made by the office up to January 1, 1917. Following is a br
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