Study on Alkali Reduction Treatments and Plant Growth Properties of Planting Concrete

Jiafeng Kong, Zhenghua Wang, Xiangbin Meng, Yuchao Zhao, Mingxu Chen and Hongzhu Quan ()
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Jiafeng Kong: College of Civil Engineering & Architecture, Qingdao Agricultural University, Qingdao 266109, China
Zhenghua Wang: Qingdao Sanxing Engineering Co., Ltd., Qingdao 266000, China
Xiangbin Meng: Rizhao Lanshan District Ocean Development Co., Ltd., Rizhao 262300, China
Yuchao Zhao: Rizhao Lanshan District Ocean Development Co., Ltd., Rizhao 262300, China
Mingxu Chen: College of Civil Engineering & Architecture, Qingdao Agricultural University, Qingdao 266109, China
Hongzhu Quan: College of Civil Engineering & Architecture, Qingdao Agricultural University, Qingdao 266109, China

Sustainability, 2022, vol. 14, issue 19, 1-15

Abstract: The use of planting concrete (PC) is one of the most prevalent slope protection methods. However, PC offers poor plant growth properties and poor ecological performance due to its high alkalinity. Therefore, in this study we used an orthogonal experimental design to optimize the mix design, and we used three alkali reduction treatments to reduce alkalinity and improve plant growth properties. The compressive strength, interconnected porosity, and pH values were analyzed to obtain the optimal level. Subsequently, the plant growth property test was conducted both indoors and outdoors. Stem length was used to evaluate different plants, which were grown in both natural soil (NS) and construction waste (CW). The experiment results show that the paste–aggregate ratio (PR) has the greatest impact on the above properties and that the optimum levels for PR, water–binder ratio (W/B), and fly ash addition level (FA) are 1/5, 0.29, and 10%, respectively. Additionally, the compound alkali reduction treatments, which combined the use of 0.4% ferrous sulfate in the planting substance and 3% potassium dihydrogen phosphate in the soaking solution, were effective. Furthermore, tall fescue may have potential applications in combination with CW. In conclusion, PC that has undergone alkali reduction treatments shows potential for application in slope protection, and thus may help to improve sustainability.

Keywords: planting concrete; orthogonal experimental design; alkali reduction; plant growth; construction waste (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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