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Fracture and fatigue study of pervious concrete with 15–20% void ratio
Sādhanā ( IF 1.6 ) Pub Date : 2020-06-11 , DOI: 10.1007/s12046-020-01374-6
R R Singh , Arpan Jot Singh Sidhu

Pervious concrete has been increasingly used all over the world to reduce the amount of rain water runoff and improve the water quality near light-traffic-volume pavements and parking lots, but its use in India is a relatively unexplored territory. The use of pervious concrete in high-load roads (HLR) requires a balance between the permeability and strength, as increasing the permeability by increasing porosity ends up in reducing the strength. Hence, there is a perceived need for pervious concrete mixture with optimum mechanical and hydraulic properties for use in HLR. In the present study, an attempt was made to determine that combination of aggregate size, water:cement (w/c) ratio and amount of supplementary cementitious material that would provide the best possible hydraulic and mechanical properties. The cement used was 53-grade Ordinary Portland Cement. Results were measured as flexural strength, compressive strength (both measures of mechanical properties), void ratio, porosity and permeability (as three measures of hydraulic properties). The mix with highest compressive strength and void ratio ranging between 15% and 20% was considered optimum and tested for fracture–fatigue. The results indicated that high-strength pervious concrete (i.e., compressive strength 32–45 MPa and flexural strength 3.9–5.29 MPa at 28 days of curing) can be achieved even with void ratio (%) of more than 15%).



中文翻译:

孔隙率为15%至20%的透水混凝土的断裂和疲劳研究

渗透性混凝土在世界范围内已越来越多地用于减少雨水径流量并改善轻交通量人行道和停车场附近的水质,但在印度使用的混凝土尚未开发。在高负荷道路(HLR)中使用透水混凝土需要在渗透性和强度之间取得平衡,因为通过增加孔隙率来增加渗透性最终会降低强度。因此,人们认为需要用于HLR的具有最佳机械和水力学性能的透水混凝土混合物。在本研究中,尝试确定骨料尺寸,水:水泥(w / c)胶结材料的比例和数量,以提供最佳的水硬性和机械性能。使用的水泥是53级普通波特兰水泥。测量结果为抗弯强度,抗压强度(均是机械性能的量度),空隙率,孔隙率和渗透率(作为水力性能的三种量度)。具有最高抗压强度和空隙率介于15%和20%之间的混合物被认为是最佳的,并经过了断裂疲劳测试。结果表明,即使空隙率(%)大于15%,也可以实现高强度透水混凝土(即养护28天时的抗压强度为32-45 MPa,抗弯强度为3.9-5.29 MPa)。

更新日期:2020-06-11
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