In this paper, hydroxypropyl methylcellulose (HPMC) is used as a new additive for porous vegetarian concrete (PVC) to improve its void structure and strength. The effect of the HPMC on the fluidity of the mortar was first investigated by a viscosity test. Then the cement hydration process was determined for analyzing the effect of the HPMC on the strength and durability of the hardened PVC. Subsequently, experiments to investigate the mass transport and compressive strength characteristics, as well as the vegetarian properties, of the concrete were carried out. The results show that the bonding forces between the recycled aggregates and packing layer are elevated by viscosity improvement. The viscocity and flowability are significantly related to the dosage of HPMC from 0.0‰ to 0.3‰. The harden time is also delayed while the content of HPMC increases.The segregation phenomenon caused by the recycled aggregate powder in porous concrete could also be relieved by adding HPMC. The durability of PVC in the wetting–drying cyclic test is significantly improved by incorporating HPMC. The results of the vegetarian test also prove that, with HPMC mixing, sufficient space would be created in porous concrete, which is more suitable for plant growth due to a large number of existing pore channels.

中文翻译：

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羟丙基甲基纤维素作为使用粗再生骨料的多孔素食混凝土外加剂的可行性

在本文中，羟丙基甲基纤维素（HPMC）被用作多孔素食混凝土（PVC）的新添加剂，以改善其空隙结构和强度。首先通过粘度测试研究了 HPMC 对砂浆流动性的影响。然后确定水泥水化过程，分析HPMC对硬化PVC强度和耐久性的影响。随后，进行了研究混凝土的质量传递和抗压强度特性以及素食特性的实验。结果表明，再生骨料和填料层之间的结合力随着粘度的提高而提高。粘度和流动性与0.0‰~0.3‰的HPMC用量显着相关。随着HPMC含量的增加，硬化时间也有所延迟。再生骨料在多孔混凝土中引起的离析现象也可以通过添加HPMC来缓解。通过加入 HPMC，PVC 在干湿循环试验中的耐久性显着提高。素食试验的结果也证明，HPMC混合后，多孔混凝土中会产生足够的空间，由于存在大量孔隙通道，更适合植物生长。