This study explores the coupling effect of pond ash(PA)and polypropylene(PP)fiber to control the strength and durability of expansive soil.The PA is used to chemically treat the expansive soil and PP fiber is adopted ...This study explores the coupling effect of pond ash(PA)and polypropylene(PP)fiber to control the strength and durability of expansive soil.The PA is used to chemically treat the expansive soil and PP fiber is adopted as reinforcement against tensile cracking.The sustainable use of PA and PP fiber are demonstrated by performing mechanical(i.e.unconfined compressive strength,split tensile strength and ultrasonic pulse velocity),chemical(pH value,electrical conductivity and calcite content),and microstructural analyses before and after 2nd,4th,6th,8th and 10th freezing-thawing(F-T)cycles.Three curing methods with 7 d,14 d and 28 d curing periods are considered to reinforce the 5%,10%,15%and 20%PA-stabilized expansive soil with 0.25%,0.5%and 1%PP fiber.In order to develop predictive models for mechanical and durability parameters,the experimental data are processed utilizing artificial neural network(ANN),in association with the leave-one-out cross-validation(LOOCV)as a resampling method and three different activation functions.The mechanical and durability properties of the PA-stabilized expansive soil subgrades are increased with PP fiber reinforcement.The results of ANN modeling predict the mechanical properties perfectly,and the correlation coefficient(R)approaches up to 0.96.展开更多
The interfacial adhesion between fibers and the resin matrix is considered to be one of the pivotal elements in determining the comprehensive properties of fabric composites.After years of study and development,it is ...The interfacial adhesion between fibers and the resin matrix is considered to be one of the pivotal elements in determining the comprehensive properties of fabric composites.After years of study and development,it is still challenging to find simple and effective approaches for interfacial modification.Here,inspired by the spider silk structure of nature,an efficient and green bionic system was investigated to fabricate a high-performance bovine serum albumin(BSA)adhesive through the introduction of chitosan and Ti_(3)C_(2)T_(x)nanosheets in BSA.The Ti_(3)C_(2)T_(x)nanosheets act asβ-sheet nanocrystals in the biomimetic spider silk structure,contributing to the creation of a closely cross-linking adhesive system.The results indicate that the wettability and surface activity of the fibers are significantly enhanced by the BSA adhesive modification,which efficiently increases the interfacial properties.Compared with those of the virgin fabric composites,the bonding and tensile strength of the strengthened fabric composites increase by 82%and 46.2%,respectively.In addition,the strengthened fabric composites have excellent anti-wear performance,with a 62.6%reduction in the wear rate.This paper provides novel ideas for applying biomass adhesives in tribology.展开更多
文摘This study explores the coupling effect of pond ash(PA)and polypropylene(PP)fiber to control the strength and durability of expansive soil.The PA is used to chemically treat the expansive soil and PP fiber is adopted as reinforcement against tensile cracking.The sustainable use of PA and PP fiber are demonstrated by performing mechanical(i.e.unconfined compressive strength,split tensile strength and ultrasonic pulse velocity),chemical(pH value,electrical conductivity and calcite content),and microstructural analyses before and after 2nd,4th,6th,8th and 10th freezing-thawing(F-T)cycles.Three curing methods with 7 d,14 d and 28 d curing periods are considered to reinforce the 5%,10%,15%and 20%PA-stabilized expansive soil with 0.25%,0.5%and 1%PP fiber.In order to develop predictive models for mechanical and durability parameters,the experimental data are processed utilizing artificial neural network(ANN),in association with the leave-one-out cross-validation(LOOCV)as a resampling method and three different activation functions.The mechanical and durability properties of the PA-stabilized expansive soil subgrades are increased with PP fiber reinforcement.The results of ANN modeling predict the mechanical properties perfectly,and the correlation coefficient(R)approaches up to 0.96.
基金the financial support of the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDB 0470303)the National Natural Science Foundation of China(Nos.52075523 and 52275220)the Major Science and Technology Project of Gansu Province(No.23ZDGA011).
文摘The interfacial adhesion between fibers and the resin matrix is considered to be one of the pivotal elements in determining the comprehensive properties of fabric composites.After years of study and development,it is still challenging to find simple and effective approaches for interfacial modification.Here,inspired by the spider silk structure of nature,an efficient and green bionic system was investigated to fabricate a high-performance bovine serum albumin(BSA)adhesive through the introduction of chitosan and Ti_(3)C_(2)T_(x)nanosheets in BSA.The Ti_(3)C_(2)T_(x)nanosheets act asβ-sheet nanocrystals in the biomimetic spider silk structure,contributing to the creation of a closely cross-linking adhesive system.The results indicate that the wettability and surface activity of the fibers are significantly enhanced by the BSA adhesive modification,which efficiently increases the interfacial properties.Compared with those of the virgin fabric composites,the bonding and tensile strength of the strengthened fabric composites increase by 82%and 46.2%,respectively.In addition,the strengthened fabric composites have excellent anti-wear performance,with a 62.6%reduction in the wear rate.This paper provides novel ideas for applying biomass adhesives in tribology.
