D.—l

Table 7.—Tests of Stone completed during the Year ended 31st March, 1941. Abrasion Tests by the Los Angeles Machine.

Other tests were made by sieve analysis, and for tension, lineal shrinkage, and soil constants of surface- and sub-grade materials.

By Authority: E. V. Paul, Government Printer, Wellington. —1941.

82

(Tests carried out botween 1st April and 30th June, 1940, were recorded in the last annual report and are therefore omitted). Gradings of test-samples are: A, 1J inches to -J inch; B, J inch to | inch. The Board's Standard Specifications require that the abrasion loss shall not exceed the following figures: Base-course metal, 65 per cent.; top-course, 50 per cent.; sealing-chips, 20 per cent. Locality. j Oracjing. 6 1 Geological Classification. Port Mapua, Nelson .. .. .. •• B 50'80 Marble. Patutahi Quarry, Cook County .. .. .. A 28-38 Limestone. Patutahi Quarry, Cook County . . . . . • • • B 28-88 Limestone. Motuhora Quarry, Cook County .. .. .. • B 26-08 Greywacke, shaly. Brynderwyn, Whangarei District .. .. .. B 13-78 Greywacke. Taipa, Whangarei District .. .. .. •• B 29-00 Hornblende andesite. Larmer's Road, Whangarei District .. .. .. B 26-18 Greywacke. Green Hill, Whangarei District .. .. .. .. B 24-20 Augito diorite. Bald Bock, Whangarei District .. .. .. B 25-22 Trachyte. Te Paki, Whangarei District .. .. .. . ■ A 24-72 Greywacke. Te Kao, Whangarei District .. .. .. -- A 29-04 Greywacke, slaty. Waiapu River, Gisborne .. .. •• B 18-46 Greywacke. White's Bay, Blenheim .. .. .. .. •• B 11-88 Quartzite. Fox's Island, Benwicktown .. .. .. .. B 15-36 Quartzite and Greywacke. Wangamoa River, Nelson' .. .. •• B 16-18 Greywacke. Matthew's Quarry, Papamoa .. .. .. .. B 21-52 Pyroxene andesite. Duncan's Quarry, Papamoa .. .. .. .. A 20-30 Pyroxene andesite. P.W.D. Quarry, Athenree .. .. .. .. A 38-90 Hornblende andesite. Tauranga County Quarry, Athenree .. .. .. B 19-78 Pyroxene andesite. Wangamoa River, Nelson .. .. .. -• A 13-56 Greywacke and andesite. Wangamoa River, Nelson .. .. .. .. B 13-70 Greywacke and andesite. Motueka Borough Pit, Hursthouse Street .. .. .. B 18-88 Greywacke, andesite, and sandstone. Waipara County Quarry .. .. .. .. A 13-54 Greywacke. Cobclen Beach .. .. .. .. •• A 15-70 Greywacke and some sandstone. Cobden Beach .. .. .. .. .. •• B 15-72 Greywacke and some sandstone. Nelson Creek, Grey County .. .. .. .. A 21-64 Greywacke and sandstone. 17-Valley Stream, Blenheim ... .. .. .. A 26-94 Greywacke and sandstone. Hunua Gorge, Papakura .. .. .. .. A 10-58 Greywacke. Hunua Gorge, Papakura .. .. .. •• B 10-02 Greywacke. Kakariki, Rangitikei River .. .. .. .. B 16-12 Greywacke. Totara Plat .. .. .. .. .. • • A 23-80 Greywacke, quartz, &e. North Beach, Greymouth .. .. .. .. B 15-56 Greywacke, quartz, &c. P.W.D. Quarry, Western Springs, Auckland .. .. A 23-94 Basalt-scoria. P.W.D. Quarry, Western Springs, Auckland .. .. B 23-62 Basalt-scoria. Waitakere Scenic Drive, Auckland .. .. .. A 37-26 Meiaphyre. Waitakere Scenic Drive, Auckland .. .. .. B 37-00 Meiaphyre. Ferndale Road Quarry, Mount Wellington .. .. B 22-52 Basalt, soft. Smeed's Quarry, Tuakau .. .. .. A 11-88 Basalt, nepheline. Smeed's Quarry, Tuakau .. .. .. .. B 10-86 Basalt, nepheline. Stevenson's Quarry, Runciman .. . . .. . . A 37-02 Greywacke, fine grain, partly decomposed. Gulland's Quarry, Mangatawhiri, Pokeno .. .. .. A 25-90 Greywacke. Smale's Quarry, Takapuna .. .. .. .. A 24-14 Basalt, soft. Winstone's Quarry, Mount Wellington .. .. .. B 28-14 Basalt, scoriaceous. Omahu Shingle Co., Napier .. .. .. .. B 16-32 Chiefly greywacke. Birkenhead Borough Quarry, Takapuna .. .. .. B 1.4-54 Basalt. Wellington Pipe Co., Hutt River .. .. .. B 13-06 Greywacke. Palmer'B Quarry, Dunedin .. .. .. .. B 21-44 Basalt. Neuchatel Co., Sockburn .. .. .. .. B 14-82 Greywacke. Eltham Borough Council .. .. .. .. B 40-96 Andesite. Waioeka Quarry, 7m., Tauranga District .. .. .. A 19-22 Andesite. Nukuhou Quarry, 7m„ Tauranga District .. .. .. A 34-46 Andesite and sandstone. Tirohia Quarry, Paeroa .. .. .. .. .. A .17-50 Andesite. Pitangi, Wanganui River .. .. .. .. B 22-14 Largely andesite. Kapum River, Hawera County . . . . .. .. A 39-64 Basalt-scoria. Hauraki Plains County Council: Orongo-Netherton main high- A 19-84 Hornblende andesite. way ; __ ;