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Development of high-strength pervious concrete incorporated with high percentages of waste glass
Cement and Concrete Composites ( IF 10.8 ) Pub Date : 2020-08-21 , DOI: 10.1016/j.cemconcomp.2020.103790
Peiliang Shen , Haibing Zheng , Songhui Liu , Jian-Xin Lu , Chi Sun Poon

This study presents the use of waste glass (WG) in pervious concrete, aiming to maximizing the reuse of WG in concrete. The effect of WG aggregate replacement and aggregate to binder ratio (A/B) on the mechanical properties, permeability, thermal conductivity, volume stability and pore structure were determined. The microstructures with and without immersing in 1 M NaOH 80 °C solution were also characterized. The results showed that the compressive strength decreased with the increasing replacement of WG aggregate and A/B, but the water permeability was improved. The presence of WG aggregate was effective in improving the permeability due to the smooth surface of WG aggregate and broader pore size distribution. With 100% WG aggregate replacement with A/B of 2–4, the permeability and compressive strength of the pervious concrete were still higher than the requirement of JIS A 5371. Another encouraging result was that the incorporation of a large amount of WG aggregate showed limited alkali-silica reaction (ASR) expansion in the pervious concrete, which was attributed to the low water to binder ratio, high amount of supplementary cementitious materials (SCMs), and accommodation effect of the porous structure to relieve the expansion pressure caused by ASR gel. Meanwhile, pervious concrete with a WG content of 80.95% could be produced with satisfactory functional properties and low thermal conductivity. Therefore, it is feasible to use WG aggregate to completely replace natural aggregate to achieve the maximum reuse of WG for producing pervious concrete.



中文翻译:

掺入高比例废玻璃的高强度透水混凝土的开发

这项研究提出了在渗透混凝土中使用废玻璃(WG),旨在最大程度地在混凝土中重复使用WG。确定了WG骨料替代物和骨料与粘结剂的比例(A / B)对机械性能,渗透性,导热性,体积稳定性和孔结构的影响。还描述了有和没有浸入1 M NaOH 80°C溶液的微观结构。结果表明,随着WG骨料和A / B置换量的增加,抗压强度降低,但水渗透性提高。由于WG聚集体的光滑表面和较宽的孔径分布,WG聚集体的存在可有效地改善渗透性。如果用100%WG骨料替换A / B为2-4,透水混凝土的渗透性和抗压强度仍高于JIS A 5371的要求。另一个令人鼓舞的结果是,大量WG骨料的掺入显示透水混凝土中碱-硅反应(ASR)的膨胀受到限制,这归因于低的水对粘合剂比率,大量的辅助胶结材料(SCM),以及多孔结构的调节作用,以减轻ASR凝胶引起的膨胀压力。同时,可以生产具有令人满意的功能性能和低导热率的WG含量为80.95%的透水混凝土。因此,使用WG骨料完全替代天然骨料以实现WG在生产透水混凝土中的最大再利用是可行的。另一个令人鼓舞的结果是,大量WG骨料的掺入显示透水性混凝土中碱-硅反应(ASR)的膨胀受到限制,这归因于低的水胶比,大量的辅助胶凝材料(SCM),以及多孔结构的调节效果,以缓解ASR凝胶引起的膨胀压力。同时,可以生产具有令人满意的功能性能和低导热率的WG含量为80.95%的透水混凝土。因此,使用WG骨料完全替代天然骨料以实现WG在生产透水混凝土中的最大再利用是可行的。另一个令人鼓舞的结果是,大量WG骨料的掺入显示透水性混凝土中碱-硅反应(ASR)的膨胀受到限制,这归因于低的水胶比,大量的辅助胶凝材料(SCM),以及多孔结构的调节效果,以缓解ASR凝胶引起的膨胀压力。同时,可以生产具有令人满意的功能性能和低导热率的WG含量为80.95%的透水混凝土。因此,使用WG骨料完全替代天然骨料以实现WG在生产透水混凝土中的最大再利用是可行的。这归因于低的水对粘合剂比率,大量的辅助胶结材料(SCM),以及多孔结构的调节作用,以减轻ASR凝胶引起的膨胀压力。同时,可以生产具有令人满意的功能性能和低导热率的WG含量为80.95%的透水混凝土。因此,使用WG骨料完全替代天然骨料以实现WG在生产透水混凝土中的最大再利用是可行的。这归因于低的水对粘合剂比率,大量的辅助胶结材料(SCM),以及多孔结构的调节作用,以减轻ASR凝胶引起的膨胀压力。同时,可以生产具有令人满意的功能性能和低导热率的WG含量为80.95%的透水混凝土。因此,使用WG骨料完全替代天然骨料以实现WG在生产透水混凝土中的最大再利用是可行的。

更新日期:2020-08-28
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