摘要
为探索泡沫掺量(质量分数,下同)、砖粉掺量、水料比(质量比,下同)和HPMC(羟丙基甲基纤维素)掺量、冻融循环对掺砖粉泡沫混凝土性能的影响,开展四因素五水平的正交实验,结合功效系数法确定掺砖粉泡沫混凝土最优配合比:泡沫掺量为3%、砖粉掺量为30%、水料比为0.55、HPMC掺量为0.05%。结果表明:掺砖粉泡沫混凝土的抗压强度随泡沫掺量的增加呈下降趋势,随砖粉掺量、水料比和HPMC的增加呈现先上升后下降的趋势,且随着冻融循环次数的增加,掺砖粉泡沫混凝土的强度均不断减小,原因是泡沫混凝土内部的完整气孔充分吸水之后结冰,导致气孔孔壁被挤压产生裂缝,原先密闭的孔洞变为有害孔洞,且随着冻融循环次数的增加,大量微小裂缝会拓展汇集成贯穿裂缝,严重降低泡沫混凝土强度,极大地影响掺砖粉泡沫混凝土的耐久性。
In order to explore the influence of foam content(mass fraction),brick powder content,water-material ratio,HPMC(hydroxy propyl methyl cellulose)content,and freeze-thaw cycle on the performance of brick powder mixed foam concrete,orthogonal experiments with 4 factors and 5 levels were carried out.Combined with the efficiency coefficient method,the optimal mixing ratio of brick powder foamed concrete was determined.The foam content was 3%,brick powder content was 30%,water-material ratio was 0.55 and HPMC content was 0.05%.The results show that compressive strength of foam concrete mixing brick powder with the increase of bubble content is on the decline,with brick powder,water ratio and the increase of HPMC presents the downward trend after rising first,and with the increase of freeze-thaw cycles,mixed powder foam concrete brick strength decreases continuously,the reason is that the bubble inside the concrete after complete stomatal fully absorbing water freezes.As a result,the pore wall is squeezed to produce rupture cracks,which lead to the previously closed holes becoming harmful holes.With the increase of the number of freeze-thaw cycles,a large number of small cracks will even expand and pool into penetrating cracks,which seriously reduce the strength of foamed concrete and greatly affect the durability of foamed concrete mixed with brick and powder.
作者
谢洪阳
戴宜文
董建军
邓勇
XIE Hongyang;DAI Yiwen;DONG Jianjun;DENG Yong(School of Civil Engineering and Architecture,Nanchang Hangkong University,Nanchang 330063,China)
出处
《中国粉体技术》
CSCD
2023年第4期120-129,共10页
China Powder Science and Technology
基金
国家自然科学基金项目,编号:52068054
南昌航空大学研究生创新专项资金项目,编号YC2022-130。
关键词
泡沫混凝土
砖粉
正交实验
水料比
冻融循环
功效系数法
foam concrete
brick powder
orthogonal test
water-material ratio
freeze-thaw cycle
power coefficient method
