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An experimental study and sustainability assessment of plastic waste as a binding material for producing economical cement-less paver blocks
Engineering Science and Technology, an International Journal ( IF 5.7 ) Pub Date : 2021-06-05 , DOI: 10.1016/j.jestch.2021.05.012
Karma Tempa , Nimesh Chettri , Gautam Thapa , Phurba , Cheki Gyeltshen , Dawa Norbu , Dikshika Gurung , Ugyen Wangchuk

Recycling of plastic waste (PW) is one alternate approach to reduce the adverse impact on environment despite many control measures adopted around the world. Current study introduces various types of PW as a binding material to completely substitute cement to produce cement-less paver blocks. The constituent of paver block comprises of mixture of different types of PW in different proportion mixed with natural fine aggregate. PW in varying proportions of 40%, 50%, 60% and 70% were used to replace cement and investigated to ascertain achieving satisfactory physical and mechanical properties considering temperature effects. The compressive strength increases with increase in the proportion of plastic content. However, when exposed to very high temperature, its strength is reduced by 31.17%. According to the test results, the plastic paver block has a low water absorption potential. The average initial and final setting time of the binder was 19 and 24 minutes respectively. Abrasion test indicated low surface wear, displaying high durability with maximum of 2.56% wear. A trial foot path pavement was constructed using cement-less paver blocks and evaluation of its performance are discussed. The production of one cement-less paver block utilizes 1.8 kg PW. As per the economic assessment, an average unit cost of cement-less block is evaluated to be 35.39% less than concrete paver block. The findings indicate cost benefit of 29.39 to 32.15% when PW is utilised in construction. To evaluate the sustainability, an “Environmental Suitability Index” (ESI) is developed based on three parameters: embodied energy, life-cycle costs (LCC) and re-usability based on literature review. Three additional parameters: fire resistance, social impact and labour efficiency are introduced to further enhance the ESI in the current study.



中文翻译:

塑料废料作为生产经济型无水泥摊铺机砌块的粘合材料的实验研究和可持续性评估

尽管世界各地采取了许多控制措施,但回收塑料废物 (PW) 是一种减少对环境不利影响的替代方法。目前的研究引入了各种类型的 PW 作为粘结材料,以完全替代水泥来生产无水泥摊铺机砌块。摊铺机砌块的成分由不同比例的不同类型PW与天然细骨料混合而成。使用不同比例的 40%、50%、60% 和 70% 的 PW 来代替水泥,并进行研究以确定考虑温度影响时获得令人满意的物理和机械性能。抗压强度随着塑料含量比例的增加而增加。但是,当暴露在非常高的温度下时,其强度会降低 31.17%。根据测试结果,塑料摊铺机块具有低吸水潜力。粘合剂的平均初凝和终凝时间分别为 19 分钟和 24 分钟。磨损测试表明表面磨损低,显示出高耐久性,最大磨损率为 2.56%。使用无水泥摊铺机砌块建造了一条试验人行道路面,并讨论了对其性能的评估。一个无水泥摊铺机块的生产使用 1.8 公斤 PW。根据经济评估,无水泥砌块的平均单位成本估计比混凝土摊铺块低 35.39%。研究结果表明,当 PW 用于建筑时,成本效益为 29.39% 至 32.15%。为了评估可持续性,基于三个参数制定了“环境适宜性指数”(ESI):隐含能源、基于文献综述的生命周期成本 (LCC) 和可重用性。引入三个附加参数:耐火性、社会影响和劳动效率,以进一步提高当前研究中的 ESI。

更新日期:2021-06-05
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