Fu Hongyuan, Chen Caiying, Zha Huanyi, Yuan Du, Gao Qian-Feng, Zeng Ling, Jia Chuankun
School of Traffic & Transportation Engineering, Changsha University of Science & Technology, Changsha 410114, China.
School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, China.
Polymers (Basel). 2021 Mar 5;13(5):802. doi: 10.3390/polym13050802.
Slopes with carbonaceous mudstone (CM) are widely distributed in the southwest of China and have experienced numerous geological disasters in special climate, especially in rainfall conditions. Therefore, novel materials to stabilize CM slopes have attracted increasing interests. However, developing ultra-stable and cost-effective additives for CM slopes is still a great challenge. Herein, a hydrophobic polymeric material (polyvinylidene fluoride, PVDF) is investigated as an additive to enhance the mechanical strength and long-time stability of CM slopes. The PVDF is uniformly dispersed in CM matrix via interfacial interaction. The contact angle of the PVDF-modified carbonaceous mudstone (PVDF-MCM) can reach as high as 103.95°, indicating an excellent hydrophobicity. The unconfined compressive strength (UCS) and tensile strength (TS) of PVDF-MCM have been intensively enhanced to 4.07 MPa and 1.96 MPa, respectively, compared with ~0 MPa of pristine CM. Moreover, the UCS and TS of PVDF-MCM remain at 3.24 MPa and 1.03 MPa even after curing for 28 days in high humidity conditions. Our findings show that the PVDF can improve the hydrophobicity of CM significantly, which leads to super mechanical stability of PVDF-MCM. The excellent performance makes PVDF a promising additive for the development of ultra-stable, long-lifetime and cost-effective carbonaceous mudstone slopes.
含碳质泥岩（CM）的边坡在中国西南部广泛分布，在特殊气候条件下，尤其是降雨条件下，经历了众多地质灾害。因此，用于稳定CM边坡的新型材料受到了越来越多的关注。然而，开发用于CM边坡的超稳定且经济高效的添加剂仍然是一个巨大的挑战。在此，研究了一种疏水性聚合物材料（聚偏氟乙烯，PVDF）作为添加剂，以增强CM边坡的机械强度和长期稳定性。PVDF通过界面相互作用均匀分散在CM基质中。PVDF改性碳质泥岩（PVDF-MCM）的接触角可达103.95°，表明具有优异的疏水性。与原始CM的约0MPa相比，PVDF-MCM的无侧限抗压强度（UCS）和抗拉强度（TS）分别显著提高到4.07MPa和1.96MPa。此外，即使在高湿度条件下养护28天后，PVDF-MCM的UCS和TS仍分别保持在3.24MPa和1.03MPa。我们的研究结果表明，PVDF可以显著提高CM的疏水性，这导致PVDF-MCM具有超强的机械稳定性。优异的性能使PVDF成为开发超稳定、长寿命且经济高效的碳质泥岩边坡的有前景的添加剂。
