轻型化竹基混凝土模板热压工艺的响应面优化  

Response surface optimization of hot-pressing technology for light bamboo-based concrete formwork

作　　者：盛佳乐 陈家宝 巫其荣 齐文玉[1] 关鑫[1] 李吉庆[1] 林金国[1] SHENG Jiale;CHEN Jiabao;WU Qirong;QI Wenyu;GUAN Xin;LI Jiqing;LIN Jinguo(College of Material Engineering,Fujian Agriculture and Forestry University,Fuzhou 350002,China)

机构地区：[1]福建农林大学材料工程学院

出　　处：《林业工程学报》2019年第6期54-61,共8页Journal of Forestry Engineering

基　　金：福建省科技重大专项(2014NZ0003);福建省林业科技推广项目(闽林推[2017]SJ18号);福建农林大学科技创新专项基金(KFA17218A/CXZX2018011)

摘　　要：为了对氧冷等离子体改性组坯结构优化后的轻型化竹基混凝土模板进行热压工艺优化,采用响应面法的中心组合设计(BBD)原理,以热压压力、热压温度、热压时间、竹材含水率为参考因素,进行4因素3水平的响应面研究。结果表明,各热压因素之间均具有较强的交互作用,其中,热压压力和竹材含水率的交互作用对静曲强度影响最大。通过响应面软件的模型优化得出的最佳热压方案为:热压压力3.22 MPa,热压温度142.08℃,热压时间0.8 min/mm,竹材含水率15%。且得到响应值静曲强度(Y)与实际自变量X1、X2、X3和X4的回归模型方程为Y=97.78+0.12X1-1.47X2+0.61X3+1.17X4+0.10X1X2-0.93X1X3+2.97X1X4-1.25X2X3+0.90X2X4-1.24X3X4-3.58X1^2-3.58X2^2-0.40X3^2-1.60X4^2。该方案下氧冷等离子体改性轻型化竹基混凝土模板的干状纵向静曲强度的理论预测值为98.74 MPa,二次回归方程与试验实际值的相关性达94.35%,且能解释88.69%响应值的变化。根据最优方案制备的氧冷等离子体改性轻型化竹基混凝土模板的干状纵向静曲强度试验测定值为99.7 MPa,预测准确度为99%,且经氧冷等离子体改性的轻型化竹基混凝土模板各项物理力学性能均能满足LY/T 1574—2000的要求。As one of the biodegradable and renewable materials in nature,bamboo is flexible,shock-resistant,and preferable to exclusive use of bamboo-based concrete formwork for the construction applications.The properties of bamboo reinforcement could be determined by the factors of the slab structure and construction technique with bamboo reinforced concrete.Most importantly,the hot-pressing process of the lightweight bamboo-based concrete formwork can affect its strength.In order to optimize the hot-pressing process of the bamboo-based concrete formwork,the oxygen cold plasma method was utilized in this study.Based on the design principle of Box-Behnken design(BBD),the response surface algorithm with the four reference factors(hot-pressing pressure,hot-pressing temperature,hot-pressing time and moisture content of bamboo)and three levels was employed.The results showed that there was a strong interaction among the hot-pressing factors,and the interaction between hot-pressing pressure and bamboo moisture content had the greatest impact on the static bending strength.The optimal hot-pressing scheme obtained by the model optimization of the response surface software was as follows:the hot-pressing pressure(X1)was 3.22 MPa,the hot-pressing temperature(X2)was 142.08℃,the hot-pressing time(X3)was 0.8 min/mm,and the bamboo moisture content(X4)was 15%.The regression model equation of response value static flexural strength(Y)to actual independent variables X1,X2,X3 and X4 was Y=97.78+0.12X1-1.47X2+0.61X3+1.17X4+0.10X1X2-0.93X1X3+2.97X1X4-1.25X2X3+0.90X2X4-1.24X3X4-3.58X1^2-3.58X2^2-0.40X3^2-1.60X4^2.The theoretical prediction value under this scheme was 98.74 MPa,the correlation between the quadratic regression equation and the actual test value was 94.35%,and it could explain 88.69%of the changes in response values.According to the optimal scheme,the dry longitudinal static strength of lightweight bamboo-based concrete formwork modified by oxygen cold plasma was 99.7MPa,the prediction accuracy was 99%,and the physical and mec

关 键 词：竹基混凝土模板 轻型化 氧冷等离子体 热压工艺 响应面法 

分 类 号：S781.9[农业科学—木材科学与技术]