Yongdong Yan^*, Youdong Si, Chunhua Lu, Keke Wu

Structural Durability & Health Monitoring, Vol.17, No.3, pp. 225-238, 2023, DOI:10.32604/sdhm.2022.022629

Abstract This research aims to investigate the effect of frost damage on chloride transportation mechanism in ordinary and fiber concrete with both theoretical and experimental methods. The proposed theoretical model takes into account the varying damage levels caused by concrete cover depth and freeze-thaw cycles, which are the two primary parameters affecting the expression of the chloride diffusion coefficient. In the experiment, three types of concrete were prepared: ordinary Portland concrete (OPC), polypropylene fiber concrete (PFC), and steel fiber concrete (SFC). These were then immersed in NaCl solution for 120 days after undergoing 10, 25, and 50 freeze-thaw cycles. The damage… More >

Wankui Ni¹, Jiaxin Zhong^1,2, Haiman Wang^1,*

Journal of Renewable Materials, Vol.11, No.4, pp. 1699-1814, 2023, DOI:10.32604/jrm.2022.023805

Abstract Fiber-reinforced soils have been of great interest to experimenters for building foundations’strength performance, time, and economy. This paper investigates the effects of water content and polypropylene fiber dosage and length on loess’s unconfined compressive strength (UCS) according to the central composite response surface design test procedure. The water content is 11%–25%, the mass ratio of fiber to soil is 0.1%–0.9%, and the fiber length ranges from 6–18 mm. The response surface method (RSM) developed full quadratic models of different variables with response values. After analysis of variance (ANOVA), the mathematical model developed in this study was statistically significant (p ≤… More > Graphic Abstract

Zhiyu Weng¹, Lina Wang^1,2,*, Qiang Liu², Xuemin Pan¹, Yonghao Xu³, Jing Li¹

Journal of Renewable Materials, Vol.9, No.8, pp. 1503-1517, 2021, DOI:10.32604/jrm.2021.015003

Abstract To explore an environmentally friendly improvement measure for red clay, the function and mechanism of xanthan gum biopolymer and polypropylene fibers on the strength properties of red clay were investigated by unconfined compressive strength and scanning electron microscopy tests. The test results demonstrated that the contents and curing ages of xanthan gum had significant influences on the unconfined compressive strength of red clay. Compared with untreated soil, 1.5% xanthan gum content was the optimal ratio in which the strength increment was between 41.52 kPa and 64.73 kPa. On the other hand, the strength of xanthan gum-treated red clay increased, whereas… More >