鋼纖維與玻璃纖維對高強度透水混凝土的影響

EFFECTS OF STEEL FIBER AND GLASS FIBER ON HIGH STRENGTH PERVIOUS CONCRETE

王勇智(Yung-Chih Wang) ； 李明君(Ming-Gin Lee) ； 王韡蒨(Wei-Chien Wang) ； 謝宜呈(Yi-Cheng Hsieh) ； 林瑋辰(Wei-Chen Lin)

《中國土木水利工程學刊》 34卷5期 (2022/09) Pp. 359-366

https://doi.org/10.6652/JoCICHE.202209_34(5).0001

摘要

本研究包含高強度透水混凝土與普通強度透水混凝土兩部分，高強度透水混凝土採用單一粒徑之1分或1.2分之宜蘭石作為骨材，以降低水膠比方式，摻入矽灰與強塑劑來增加漿體緻密性，高強度透水混凝土以齡期28天抗壓強度42MPa及孔隙15%為目標，並探討高強度與普通強度透水混凝土添加玻璃纖維（體積比0.25%、0.5%）及鋼纖維（體積比1%、2%）之加勁材，對抗壓強度、抗彎強度、彈性模數、韌性等之力學影響。試驗結果顯示高強度透水混凝土添加足夠的玻璃纖維與鋼纖維，抗壓強度可提升，但低纖維含量其抗壓強度低於無纖維之高強度透水混凝土；透水混凝土抗彎強度亦會隨著養護齡期的增加而提升，但含玻璃纖維或鋼纖維之配比強度並無此趨勢發展，推測是由於具有不同纖維的透水混凝土的比重大小存在較大差異。普通強度透水混凝土試體之彈性模數約為高強度透水混凝土之50%，而高強度纖維透水混凝土其彈性模數之係數與3795√fc'相當接近；高強度透水混凝土經玻璃纖維或鋼纖維加勁，抗彎韌性強度皆有一定程度的提升，效果以鋼纖維較佳，於強度峰值後仍有30%左右承載力緩緩下降直至完全破壞。

關鍵字

透水混凝土 ； 玻璃纖維 ； 鋼纖維 ； 強度 ； 彈性模數

並列摘要

This study includes high strength pervious concrete and ordinary strength pervious concrete. The high strength pervious concrete uses #1 or #1.2 of a single particle size Yilan stone as the aggregate material. The mixtures of high strength pervious concrete were improved by reducing the water-to-binder ratio and adding silica fume and superplasticizer. The high strength pervious concretes aim to carry out 28-day compressive strength above 42 MPa and porosity as close to 15% as possible to achieve the technical specifications. Both high strength and ordinary strength pervious concrete specimens reinforced with glass fiber (volume ratio 0.25%, 0.5%) and steel fiber (1%, 2%) were observed and investigated in the compressive strength, flexural strength, elastic modulus, and toughness tests. The test results show that high-strength pervious concrete with sufficient glass fiber and steel fiber could increase the compressive strength. However, the compressive strength of low-fiber content is lower than those ones without fiber. The flexural strength of pervious concrete will also increase as the curing age increases. However, the flexural strength of pervious concrete with glass fiber or steel fiber does not follow this trend due to large variation by quality control of pervious concrete with different fibers. Regardless of whether the high-strength pervious concrete mixture is improved or not, the modulus of elasticity is very close to 3795 √fc'. The steel fiber can be the effective material to improve the bending strength and toughness properties of the pervious concrete. The results show about 30% of the bearing capacity gradually decreases after the peak strength until it is completely destroyed.

並列關鍵字

pervious concrete ； glass fiber ； steel fiber ； strength ； elastic modulus

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