81001118

open access

Version of Record

ミズコウセイ リュウド チョウセイ コウテツ スラグ ロバンザイ ノ ヒンシツ ト リキガク トクセイ ノ カンリ ニカンスル イチコウサツ

Quality control and mechanical property of hydraulic, graded iron and steel slag base-course material

Japanese (日本語)

神戸大学都市安全研究センター研究報告

12

43-51

神戸大学都市安全研究センター

2008-03

2009-06-16

This paper presents the results of compaction, resilient modulus, and uniaxial compression tests on five different types of hydraulic, graded iron and steel slag (hereafter called HMS) base-course materials which were obtained from five different iron and steel plants, and discusses the variousness in the results among the five different base-course materials, referring to the industrial standard and pavement design guide used in Japan. The followings are pointed out. - The solid density of five HMS ranges from 2.37 to 3.09 g/cm^3 - While the maximum dry density and optimum water content for four HMS range from 2.122 to 2.314 g/cm^3 and from 1O.1 to 12.0%, respectively, the remaining HMS shows a maximum dry density of 1.910 g/cm^3 and a optimum water cont~nt of 15.8%. - The magnitude of uniaxial compressive strength and its increase with curing time are similar among the four HMS but the remaining HMS exhibits a larger uniaxial compressive strength and a greater strength increase with curing time. - Resilient modulus of all five HMS increases with mean effective principal stress and decreases with deviator stress, just as in the previous experimental studies. The magnitude and increase with curing time of resilient modulus are similar in the four HMS, but for the remaining HMS resilient modulus increases significantly with curing time and its stress dependency also increases. Most industrial standard and pavement design guide specify only the lower bound for the items related to mechanical properties of hydraulic, graded iron and steel slag base-course material such as uniaxial compressive strength and modified CBR. This is underlaid by a premise that mechanical properties are similar among different types of HMS, and results in a safe-side design of asphalt pavement. From this study, however, a noticeable difference is observed in uniaxial compressive strength and resilient modulus among five HMS, suggesting that a more rational specification is needed for a more effective use of HMS.

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