混凝土与水泥制品
混凝土與水泥製品
혼응토여수니제품
China Concrete and Cement Products
2015年
10期
53-56
,共4页
聚丙烯纤维%胶粉%正交试验%收缩率
聚丙烯纖維%膠粉%正交試驗%收縮率
취병희섬유%효분%정교시험%수축솔
Polypropylene fiber%Latex powder%Orthogonal experiment%Shrinkage ratio
针对我国内陆寒冷盐碱地区的环境特性，制备了面向该环境混凝土路面工程应用的聚丙烯纤维复合胶粉改性混凝土，采用正交试验研究了该混凝土材料的收缩性能，建立了收缩模型，并运用游程检验法检验了其显著性。结果表明，聚丙烯纤维复合胶粉改性混凝土的收缩率εt与测试龄期t符合指数函数关系，且在显著性水平α=0.01下其相关性显著；聚丙烯纤维和胶粉掺量对混凝土的收缩影响明显，并与混凝土的最大收缩率之间存在显著的数学模型关系。胶粉会增大混凝土后期的干燥收缩，纤维掺量的增加能够有效抑制混凝土的收缩，硅粉掺量为2.5%和纤维长度为6mm时混凝土的收缩最小。
針對我國內陸寒冷鹽堿地區的環境特性，製備瞭麵嚮該環境混凝土路麵工程應用的聚丙烯纖維複閤膠粉改性混凝土，採用正交試驗研究瞭該混凝土材料的收縮性能，建立瞭收縮模型，併運用遊程檢驗法檢驗瞭其顯著性。結果錶明，聚丙烯纖維複閤膠粉改性混凝土的收縮率εt與測試齡期t符閤指數函數關繫，且在顯著性水平α=0.01下其相關性顯著；聚丙烯纖維和膠粉摻量對混凝土的收縮影響明顯，併與混凝土的最大收縮率之間存在顯著的數學模型關繫。膠粉會增大混凝土後期的榦燥收縮，纖維摻量的增加能夠有效抑製混凝土的收縮，硅粉摻量為2.5%和纖維長度為6mm時混凝土的收縮最小。
침대아국내륙한랭염감지구적배경특성，제비료면향해배경혼응토로면공정응용적취병희섬유복합효분개성혼응토，채용정교시험연구료해혼응토재료적수축성능，건립료수축모형，병운용유정검험법검험료기현저성。결과표명，취병희섬유복합효분개성혼응토적수축솔εt여측시령기t부합지수함수관계，차재현저성수평α=0.01하기상관성현저；취병희섬유화효분참량대혼응토적수축영향명현，병여혼응토적최대수축솔지간존재현저적수학모형관계。효분회증대혼응토후기적간조수축，섬유참량적증가능구유효억제혼응토적수축，규분참량위2.5%화섬유장도위6mm시혼응토적수축최소。
Aiming at the characteristics of cold saline-alkali areas of inland in our country, polypropylene fiber com-positing latex powder modified concrete (PFCLPC) is prepared for application of cement concrete pavement engineering in this environment. Shrinkage performance of the concrete is investigated through orthogonal experiment, shrinking model of PFMLPC is set up by regression analysis and the run test is used to test significance of the model. The results show that the shrinkage ratioεt of PFCLPC and the testing age t can fit the relationship of exponential function, and the correlation is significant when the significant level α is 0.01. The influence of dosage of polypropylene fiber or latex powder on shrink-age of concrete is obviously, and a significant relationship of mathematical model exists between the maximum shrinkage ratio and them. Latex powder enhances shrinkage of concrete, on the contrary, with the increasing of fiber content, the shrinkage of concrete can reduce effectively. When content of silica fume is 2.5% or fibre length is 6 mm, shrinkage of PFCLPC is minimum.
