Jiang Lei, Jing Jiahua, Zhang Ming, Yang Shuai
College of Civil Engineering and Architecture, Anyang Normal University, Anyang, 455000, Henan, China.
Engineering Technology Research Center of Henan Province for Digital Intelligent Building and Low Carbon Building Material, Anyang, 455000, Henan, China.
Sci Rep. 2024 Jun 15;14(1):13832. doi: 10.1038/s41598-024-64719-9.
In cold areas, the steel fiber reinforced rubber concrete (SFRRC) pavement is exposed to natural environment and experiences varying degrees of damage from freezing and thawing. This can have a serious impact on the normal usage and safe operation of the pavement structure. This research examines the impact of varying rubber concentrations on multiple variables, such as the rate of mass reduction, relative dynamic modulus of elasticity, compressive strength, and thickness of the damage layer (H) during freeze-thaw (F-T) durability testing conducted on SFRRC. Furthermore, an analysis is conducted to determine the degradation pattern exhibited by SFRRC. The internal structure evolution and pore structure characteristics of SFRRC were examined using scanning electron microscopy and mercury intrusion porosimetry techniques, which revealed the underlying damage mechanism in SFRRC during F-T cycles. The results suggest that the addition of an appropriate amount of rubber can effectively enhance the frost resistance of SFRRC in water. A gradual improvement in the frost resistance of SFRRC is observed when increasing the rubber content from 0 to 10%. The optimal frost resistance is observed in SFRRC with 10% rubber content. However, when the rubber content reaches 15%, SFRRC exhibits significant degradation and lower level of resistance to freezing compared to SFRRC without rubber. Microcracks form within SFRRC due to the freezing-thawing forces experienced during the experiment, resulting in the development of a damage layer that extends from the surface to the interior. The compressive strength of the damaged layer significantly decreases as H increases. The addition of appropriate rubber in SFRRC improves its pore structure, leading to an increased proportion of harmless or less harmful pores and a reduction in average pore size, thereby significantly enhancing its frost resistance.
在寒冷地区，钢纤维增强橡胶混凝土（SFRRC）路面暴露于自然环境中，会遭受不同程度的冻融破坏。这会对路面结构的正常使用和安全运行产生严重影响。本研究考察了在对SFRRC进行冻融（F-T）耐久性试验期间，不同橡胶掺量对多个变量的影响，如质量损失率、相对动弹模量、抗压强度以及损伤层厚度（H）。此外，还进行了分析以确定SFRRC呈现的劣化模式。利用扫描电子显微镜和压汞法技术研究了SFRRC的内部结构演变和孔隙结构特征，揭示了SFRRC在冻融循环期间的潜在损伤机制。结果表明，添加适量橡胶可有效提高SFRRC在水中的抗冻性。当橡胶含量从0增加到10%时，SFRRC的抗冻性逐渐提高。含10%橡胶的SFRRC表现出最佳抗冻性。然而，当橡胶含量达到15%时，与不含橡胶的SFRRC相比，SFRRC出现明显劣化且抗冻性降低。在试验过程中，由于冻融力的作用，SFRRC内部形成微裂纹，导致从表面到内部出现损伤层。随着H的增加，损伤层的抗压强度显著降低。在SFRRC中添加适量橡胶改善了其孔隙结构，导致无害或危害较小孔隙的比例增加，平均孔径减小，从而显著提高了其抗冻性。
