【第1回舗装工学講演会講演論文集 1996年12月】

舗装工学論文集 Vol. 1, 289-298, 1996.12

まさ土の風化度と道路用材料としての品質評価

古河 幸雄¹・藤田 龍之²

¹正会員 博士(工学) 日本大学助教授工学部土木工学科(〒963郡山市田村町徳定字中河原1番地)
²正会員 工学博士 日本大学教授工学部土木工学科(〒963郡山市田村町徳定字中河原1番地)

阿武隈高地にはまさ土が広く分布し,土工事などで大量に使用されているにも関わらず,その性質に関する 総合的研究は行われていなかった.本研究は,この地域のまさ土に対し,道路用材料としての品質評価を目的 に物理化学的・鉱物的性質,および締固め・CBR等の安定化に関する特徴を調べたもので,西日本などのデ ータと併せて検討した.阿武隈高地のまさ土は,西日本のまさ土に比べると細粒化や土粒子構造の発達傾向, 結晶性の低下傾向が認められ,また,乾燥密度が同じでもCBRが小さい特徴を示した.さらに,日本道路公 団の規定により行った品質の評価は,強熱減量値から判断できることを示した.

Key Words: weathering, decomposed granite soil, physico-chemical properties,compaction C.B.R, earthwork material

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The decomposed granite soil which is widely distributed over the Abukuma Heights is used in a considerably large amount in a variety of construction work including earthwork materials. HoweVer none of extensive study concerning the properties viewed from a standpoint of geotechnical engineering has been made. Keeping such a situation in mind‾ fundamentals of the physico- chemical and mineralogical properties together with features concerning the compaction, the stabilization of CBR, etc. were examined, and concurrently investigation was made taking up the data obtained in other regions mainly including the ones in Western Japan. As a result, a tendency was noted with the decomposed granite soil of the Abukuma Heights in grain refining, the development of the soil grain structure, or lowering of crystallineness. On the other hand, a feature is pointed out with the fact that CBR is very small even if dry density is the same. Furthermore the evaluation of the quality conducted in accordance with the rules of Japan Highway Public Corporation has revealed that judgement can be made from the ignition loss values.

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