纤维种类及掺量对机场路面混凝土性能影响的研究

IF 0.1 Q4 ENGINEERING, CIVIL Romanian Journal of Transport Infrastructure Pub Date : 2019-07-01 DOI:10.2478/rjti-2019-0006
M. Dicu, A. Matei, C. Voiniţchi
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引用次数: 0

摘要

摘要:本文遵循纤维增强混凝土(FRC)作为机场跑道路面解决方案的潜在实践,以提高承载强度,从而降低目前使用的混凝土层高度。实验中,以抗折强度为5mpa的素混凝土为基准,研究了3种不同掺量(混凝土体积的0.5%、1%和1.5%)和4种不同掺量的纤维(1%掺量为50mm长钩钢纤维、30mm长钩钢纤维、30mm长卷曲钢纤维和50mm长聚丙烯纤维)对纤维增强波特兰水泥混凝土性能的影响。更确切地说,研究表明纤维的抗压和抗弯强度、收缩率、热膨胀系数、弹性模量和泊松比随纤维种类和用量的变化。针对最高性能混凝土(抗折强度为7 MPa),采用两种方法(一般法和优化法)和一种承重强度评价方法(ACN - PCN法)对刚性机场路面设计进行了研究,并与普通5 MPa混凝土进行了对比。此外,通过使用两种设计方法对高性能9 MPa混凝土的板的高度进行评估,强调了板的厚度与抗弯强度的增长成比例的减少。
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Study of the Influence of Fibres Type and Dosage on Properties of Concrete for Airport Pavements
Abstract The paper follows the potential practice of fiber reinforced concrete (FRC) as a solution for airport`s runway pavements, in order to increase the bearing strength, resulting in decreasing the height of the concrete layer that is currently used. Experimentally, the study focuses on the properties of fiber reinforced Portland cement concrete using 3 different percentages (0.5%, 1% and 1.5% of the concrete volume) and 4 different types of fiber (for 1% percentage – hooked steel fiber 50 mm length, hooked steel fiber 30 mm length, crimped steel fiber 30 mm length and polypropylene fiber 50 mm lenght), using as reference a plain concrete with 5 MPa flexural strength. More exactly, the study presents the change in compressive and flexural strength, shrinkage, thermal expansion factor, elastic modulus and Poisson`s ratio over fiber type and dosage. For the highest performance concrete (7 MPa flexural strength), it has been made a study using two methods for rigid airport pavements design (general method and optimized method), and one method for evaluation of bearing strength (ACN – PCN method), which is compared to a plain 5 MPa concrete. Furthermore, the decrease in the slab`s thickness proportionally to the growth of the flexural strength is emphasized by evaluating the slab`s height for a high performance 9 MPa concrete using both design methods.
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审稿时长
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