Ghasemzadeh Hasan, Mehrpajouh Aida, Pishvaei Malihe
Department of Civil engineering, K.N. Toosi University of Technology, No. 1346, Valiasr Street, Mirdamad Intersection, Tehran 19967-15433, Iran.
Hochschule fùr Technik und Wirtschaft Dresden, Friedrich-List-Platz1, 01069 Dresden, Germany.
ACS Omega. 2022 Jun 2;7(23):19204-19215. doi: 10.1021/acsomega.2c00236. eCollection 2022 Jun 14.
Although numerous studies have shown the successful use of acrylic-based polymers as one of the chemical substances to improve soil mechanical behavior, their basic ingredients in commercial products are not revealed due to the manufacturers' confidential policy. Among them, additives including pH control agents, thickeners, antifoams, and wetting agents are widely well-known owing to their enhancement effects on different properties of polymers. However, the effect of additives on the soil-polymer mixture is not completely investigated. Therefore, in this study, some of the frequently used additives in acrylic polymers were selected to investigate the effects of each one on the compressive strength of clayey soil. These additives include xanthan gum, Tylose, and carboxymethyl cellulose (CMC) as thickeners, sodium dodecyl sulfate (SDS), cetyltrimethylammonium bromide (CTAB), and Kenon 10 as wetting agents, an ether-based antifoaming agent, and ammonia solution as a pH control agent. A combination of each additive (between 0 and 5% by weight) and polymethyl methacrylate--butyl acrylate (with 5% by weight) was added to kaolinite soil to measure the variation of unconfined compressive strength (UCS) and the stress-strain behavior of the soil-polymer-additive mixture. The results indicated that thickeners significantly affected the unconfined compressive strength up to 248% and increased the ductility of the stabilized samples. Acidic pH of the emulsion led to higher unconfined compressive strength of the stabilized soil up to 2.33 times that with alkaline. It is also demonstrated that the use of a higher amount of anionic wetting agent resulted in higher failure strain and lower unconfined compressive strength.
尽管众多研究表明，丙烯酸基聚合物作为改善土壤力学性能的化学物质之一已成功得到应用，但由于制造商的保密政策，其商业产品中的基本成分尚未公开。其中，包括pH调节剂、增稠剂、消泡剂和湿润剂在内的添加剂，因其对聚合物不同性能的增强作用而广为人知。然而，添加剂对土壤 - 聚合物混合物的影响尚未得到充分研究。因此，在本研究中，选取了丙烯酸聚合物中一些常用的添加剂，以研究它们各自对黏性土抗压强度的影响。这些添加剂包括作为增稠剂的黄原胶、羟丙基甲基纤维素和羧甲基纤维素（CMC），作为湿润剂的十二烷基硫酸钠（SDS）、十六烷基三甲基溴化铵（CTAB）和科宁10，一种醚基消泡剂，以及作为pH调节剂的氨水溶液。将每种添加剂（按重量计在0%至5%之间）与聚甲基丙烯酸甲酯 - 丙烯酸丁酯（按重量计5%）的组合添加到高岭土中，以测量无侧限抗压强度（UCS）的变化以及土壤 - 聚合物 - 添加剂混合物的应力 - 应变行为。结果表明，增稠剂对无侧限抗压强度有显著影响，增幅高达248%，并增加了稳定样品的延性。乳液的酸性pH值使稳定土的无侧限抗压强度比碱性pH值时高出2.33倍。研究还表明，使用较高含量的阴离子湿润剂会导致更高的破坏应变和更低的无侧限抗压强度。
