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- 검색키워드
- 저자 : Lino Maia (검색결과 2 건)
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Modulus of elasticity of concretes produced with basaltic aggregate
Lino Maia,Farhad Aslani 사단법인 한국계산역학회 2016 Computers and Concrete, An International Journal Vol.17 No.1
Basalt is a type of volcanic rocks, grey to black in colour, contains less than 20% quartz, 10% feldspathoid, and at least 65% of the feldspar of its volume. Basalt is considered an igneous rock with fine grains due to the rapid cooling of lava. Basaltic rocks have been widely used as aggregate for various purposes. The study presented in this paper was carried out on basalts that are widespread in the Madeira Island of Portugal and that comprise the major source of local crushed rock aggregates. This paper discusses an experimental programme that was carried out to study the effects of basaltic aggregate on the compressive strength and modulus of elasticity of concrete. For this purpose, cylinder specimens with 150×300 mm dimensions and prism specimens with 150×150×375 mm dimensions were cast. The experimental programme was carried out with several concrete compositions belonging to strength classes C20/25, C25/30, C30/37, C40/50 and C60/75. The Eurocode 2 indicates the modulus of elasticity should be 20% higher when the aggregates are of basaltic origin, however results showed significant differences and a correction is proposed.
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Effect of specimen geometry and specimen preparation on the concrete compressive strength test
Farhad Aslani,Lino Maia,José Santos 국제구조공학회 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.62 No.1
This paper discusses an experimental programme that was carried out to study the effects of specimen size-shape and type of moulds on the compressive strength of concrete. For this purpose, cube specimens with 150 mm dimensions, cylinder specimens with 150×300 mm dimensions, and prism specimens with 150×150×375 mm dimensions were prepared. The experimental programme was carried out with several concrete compositions belonging to strength classes C20/25, C25/30, C30/37, C40/50 and C60/75. Furthermore, the test results were curve-fitted using the least squares method to obtain the new parameters for the modified size effect law.
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