为降低机制砂混凝土的开裂敏感性,提高其应用技术水平,通过测试机制砂混凝土的干燥收缩值,并结合相应砂浆保水性和扫描电镜(SEM)微观形貌分析,研究了不同使用方式的减缩剂对石粉(SD)含量不同的机制砂混凝土干燥收缩的影响.结果表明,对于减缩剂使用方式不同的相同混凝土试件,内掺(SRA-M)和外涂(SRA-C)都降低了试件的干燥收缩,但对于不同的试件其降低幅度不同；对于减缩剂使用方式相同的不同混凝土试件,SRA-M更有利于降低石粉含量为5％的机制砂混凝土试件(5-SD)干燥收缩,而降低石粉含量为10％的机制砂混凝土试件(10-SD)干燥收缩更有效的减缩剂使用方式是SRA-C;减缩剂通过阻滞试件内部自由水分迁移渗出,提高其保水性,从而降低干燥收缩值.
参考文献
| [1] | J.R Goncalves;L.M. Tavares;R.D. Toledo Filho .Comparison of natural and manufactured fine aggregates in cement mortars[J].Cement and Concrete Research,2007(6):924-932. |
| [2] | Prakash Nanthagopalan;Manu Santhanam .Fresh and hardened properties of self-compacting concrete produced with manufactured sand[J].Cement & concrete composites,2011(3):353-358. |
| [3] | 蒋正武,石连富,孙振平.用机制砂配制自密实混凝土的研究[J].建筑材料学报,2007(02):154-160. |
| [4] | 陈正发,刘桂凤,秦彦龙,徐建民.恶劣环境区机制砂混凝土的强度和耐久性能[J].建筑材料学报,2012(03):391-394. |
| [5] | 李北星,柯国炬,赵尚传,王稷良,顾青.机制砂混凝土路用性能的研究[J].建筑材料学报,2010(04):529-534. |
| [6] | 王雨利,王稷良,周明凯,李北星,管学茂.机制砂及石粉含量对混凝土抗冻性能的影响[J].建筑材料学报,2008(06):726-731. |
| [7] | 李北星,周明凯,田建平,胡晓曼.石粉与粉煤灰对C60机制砂高性能混凝土性能的影响[J].建筑材料学报,2006(04):381-387. |
| [8] | Celik T;Marar K .Effects of crushed stone dust on some properties of concrete[J].Cement and Concrete Research,1996,26(07):1121-1130. |
| [9] | Li Beixing;Wang Jiliang;Zhou Mingkai .Effect of limestone fines content in manufactured sand on durability of low- and high-strength concretes[J].Construction and Building Materials,2009(8):2846-2850. |
| [10] | 王稷良,周明凯,朱立德,贺图生.机制砂对高强混凝土体积稳定性的影响[J].武汉理工大学学报,2007(10):20-24. |
| [11] | Ahmed E;E I KourdA .Properties of concrete incorporating natural and crushed stone very fine sand[J].ACI Materials Journal,1989,86(04):417-421. |
| [12] | Malhortra V M;Carette G G .Performance of concrete incorporating limestone dust as partial replacement for sand[J].ACI Materials Journal,1985,82(03):363-368. |
| [13] | 钱春香,耿飞,李丽.减缩剂的作用及其机理[J].功能材料,2006(02):287-291. |
| [14] | 高南箫,刘加平,冉千平,田倩,张建纲.两亲性低分子聚醚减缩剂减缩机理探索[J].功能材料,2012(14):1931-1935. |
| [15] | Konstantin Kovler;Semion Zhutovsky .Overview and future trends of shrinkage research[J].Materials and structures,2006(9):827-847. |
| [16] | 王智,乔墩,钱觉时,石亮.减缩剂外涂对水泥基材料性能的影响[J].硅酸盐学报,2009(07):1085-1091. |
| [17] | 钱觉时,乔墩,石亮,党玉栋,王智,李有光.减缩剂外涂对混凝土性能的影响及作用机理[J].硅酸盐学报,2009(12):2090-2096. |
| [18] | 马一平,杨晓杰,王培铭.纤维增强对水泥基材料早期干缩开裂性能的影响[J].同济大学学报（自然科学版）,2007(05):644-648. |
| [19] | 卞荣兵,马存前,刘姝,沈健.新型混凝土减缩剂评价研究[J].建筑材料学报,2005(04):436-439. |
| [20] | 张志宾,徐玲玲,唐明述.减缩剂对水泥基材料水化和孔结构的影响[J].硅酸盐学报,2009(07):1244-1248. |
| [21] | He Zhihai;Qian Chunxiang .Internal relative humidity and creep of concrete with modified admixtures[J].Progress in Natural Science:Materials International,2011,21:426-432. |
| [22] | HU Shuguang,WU Jing,YANG Wen,LU Linnu,HIE Yongjia.Relationship Between Autogenous Deformation and Internal Relative Humidity of High-strength Expansive Concrete[J].武汉理工大学学报（材料科学版）（英文版）,2010(03):504-508. |
| [23] | D.P. Bentz;M.R. Geiker;K.K. Hansen .Shrinkage-reducing admixtures and early-age desiccation in cement pastes and mortars[J].Cement and Concrete Research,2001(7):1075-1085. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%