泡沫混凝土力学性能与气泡结构研究  

Study on Mechanical Properties and Bubble Structure of Foam Concrete

作　　者：林宝臣 张春良 王威 温泉 李逸飞 Lin Baochen;Zhang Chunliang;Wang Wei;Wen Quan;Li Yifei(Heilongjiang Heijianyi Construction Engineering Co.Ltd.,Harbin,Heilongjiang 150040;Heilongjiang Construction Engineering Group Co.Ltd.,Harbin,Heilongjiang 150000;School of Civil Engineering,Harbin Institute of Technology,Harbin,Heilongjiang 150006)

机构地区：[1]黑龙江省黑建一建筑工程有限责任公司,黑龙江哈尔滨150040 [2]黑龙江省建工集团有限责任公司,黑龙江哈尔滨150000 [3]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150006

出　　处：《江西建材》2024年第11期17-21,25,共6页

摘　　要：文中借助正交试验设计,探讨了聚丙烯纤维长度、掺杂比例以及硅灰掺杂量三种变量与泡沫混凝土力学属性之间的相互作用及效应规律,通过显微形貌观测,结合图像处理,对气泡特征与孔径分布进行表征,研究强度提升的内在机理。结果表明,影响泡沫混凝土强度的主导因素是硅灰掺量,其次是纤维长度,纤维掺量影响最小。泡沫混凝土的最优化正交配比方案为纤维长度约9 mm,纤维体积掺杂比例达0.5%,硅灰掺杂量为15%。泡壁缺陷对强度的削弱作用比孔径分布不合理对强度的削弱作用更大。抗压强度与400~800μm的气孔呈正相关关系,与1.5~2.5 mm的气孔呈负相关关系,受其他孔径范围的气孔影响较小。With the help of orthogonal experimental design,the interaction and effect rules between polypropylene fiber length,doping ratio and silica ash doping amount and mechanical properties of foamed concrete were discussed.The characteristics of bubbles and pore size distribution were characterized through microscopic morphology observation and image processing,and the internal mechanism of strength improvement was studied.The results show that the main factor affecting the strength of foamed concrete is silica fume content,followed by fiber length,and fiber content has the least influence.The optimal orthogonal ratio scheme for foamed concrete is a fiber length of approximately 9 mm,a fiber volume doping ratio of 0.5%,and a wollastonite doping ratio of 15%.The effect of bubble wall defects on the weakening of strength is greater than that of improper pore size distribution.The compressive strength was positively correlated with the porosity in the range of 400~800μm,and negatively correlated with the porosity in the range of 1.5~2.5 mm,and was less affected by other pore sizes.

关 键 词：泡沫混凝土 聚丙烯纤维 力学性能 气泡结构 图像分析 

分 类 号：TU528.572[建筑科学—建筑技术科学]