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No.11 (1964/12) >

Title :沖縄本島に産する海砂利の分布および物理的性質
Title alternative :Distribution and engineering properties of beach aggregates of Okinawa Island.
Authors :上間, 清
Authors alternative :Uema, Kiyoshi
Issue Date :Dec-1964
Abstract :At present in Okinawa the most commonly used coarse aggregate is one processed from lime stone that is widely distributed on the island. The other thinkable sources of aggaegates are river gravels and beach aggregates. However, the amount of production from these sources is limited, especially river gravels being practically negligible. Beach aggregates, although limited in the production, have relatively wider geological distribution on the beaches and have been used in various fields including engineering ones. However, it is doubtful that beach aggregates have been used properly, with the exception of a few cases, considering the engineering properties of them. To know the distribution and engineering properties is necessary and basic when we are to use the beach aggregates effectively and economicaly, and also to establish the limitation of their use as engineering materials. Since a study has been made on crushed stone aggregates and reported partly elesewhere in this bulletin, this paper deals with the distribution and basic engineering properties of beach aggregates. The basic properties tested and the designations of the test methods by JIS (Japan Industrial Standards) are (1) sieve analysis (JIS A 1102), (2) unit weight (JIS A 1104), (3) specific gravity and absorption (JIS A 1110), (4) abrasion by use of Los Angels Machine (JIS A 1121), and (5) compressive strength of molded cone cylinder (JIS A 1108) (partly). Of the distribution the survey was conducted by reconnaisance in the middle of September in 1963. The survey covered most of the coastline of the island, exept for a few miles due to difficulty in access and some other reasons. During the survey attention was directed to (1) the form of distribution, (2) the quantitative distribution of both beach aggregates and sands, (3) the degree of accessibility to the beach, and (4) the collection of representative samples for later physical tests. The geological distribution and the test results are shown in Fig. 1 and Table 1, and Table 2, respectively. Discussion is made for the test results comparing them with the values normally obtained for other aggregates and also checked is the comformity with the specifications of JSCE (Japan Society of Civil Engineers). In the final section conclusions are drawn concerning the distribution, engineering properties, and limitation of the use of the beach aggregates.
Type Local :紀要論文
ISSN :0485-7828
Publisher :琉球大学農家政工学部
URI :http://hdl.handle.net/20.500.12000/19468
Citation :琉球大学農家政工学部学術報告 = The science bulletin of the Division of Agriculture, Home Economics & Engineering, University of the Ryukyus no.11 p.223 -233
Appears in Collections:No.11 (1964/12)

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