水泥在水化硬化过程中发生的体积收缩会导致混凝土产生微裂纹,降低混凝土的耐久性和使用寿命,新型镁质膨胀材料是以MgO为膨胀组分,以储量丰富和价廉易得的天然矿物为原料,经过煅烧制备得到的膨胀材料,可以用以补偿混凝土的收缩.本文主要研究了新型镁质膨胀材料的制备工艺,研究结果表明,适宜的生料配比为DOL51%、SERP 9.5%和MAG 39.5%,膨胀材料中MgO的设计含量为57%左右,烧成制度为1200℃下煅烧1.0h,空气淬冷.膨胀材料制备中要注意控制一定的颗粒度,避免过细粉磨.
参考文献
| [1] | Lura Pietro;Van Breugel Klaas;Maruyama Lppei .Effect of curing temperature and type of cement on earlyage shrinkage of highperformance concerete[J].Cement and Concrete Research,2001,31(02):1867-1872. |
| [2] | Baar B;Hoseinian S B;Beygi A .Shrinkage of conerete stored in natural environments[J].Cement and Concrete Composites,2003,25(01):19-29. |
| [3] | Loukili Ahmed;Chopin David;Khelidj Abdelhafid;Le Touzo Jean Yves .A new approach to determine autogenous shrinkage of mortar at an early age considering temperaturc history[J].Cement and Concrete Research,2000,30(06):915-922. |
| [4] | Jeansen Ole Mejlhede;Hansen Per Freiesleben .Influence of temperalure on autogenous deformation and relative humidity change in hardening eement paste[J].Cement and Concrete Research,1999,29(04):567-575. |
| [5] | Garci Iluenge Maria C;Jennings Ilamilin M .Examining the relationship between the microstrueture of calcium silicate hydrate and drying shrinkage of cement pastes[J].Cement and Concrete Research,2002,32(02):289-296. |
| [6] | Salah A Altoubat;David A lange.CDreep,shrinkage,and cracking of restrained concrete at early age[J].Acta Materialia,2001(7-8):323-331. |
| [7] | 叶青 .微膨胀型水泥及其混凝土的性能与机理的研究[D].浙江大学,1998. |
| [8] | Fu Yan;Gu Ping;Xie Ping;Beaudoin J J .Effect of chemical admixtures on the expansion of shrinkage-compensating cement containing a pre-hydrated high alumina cement-based expansive addilive[J].Cement and Concrete Research,1995,25(01):29-38. |
| [9] | 李祖民;徐跃之 .低热与中热水泥混凝土抗裂性能研究[J].民长江,1998,29(05):35-37. |
| [10] | 周孝正,陈文耀.低热微膨胀水泥在安康工程中的应用[J].水利水电技术,1993(09):39-42. |
| [11] | T.A. Hammer .Effect of silica fume on the plastic shrinkage and pore water pressure of high-strength concretes[J].Materials and structures,2001(239):273-278. |
| [12] | 高英力,周士琼.粉煤灰对水泥浆体化学收缩的影响[J].混凝土,2002(06):37-39. |
| [13] | Kevin J Folliard;Neal S Berke .Properties of high-performance concrete containing shrinkage-reducing admixture[J].Cement and Concrete Research,1997,27(09):1357-1364. |
| [14] | 邵正明;张超;仲晓林.国外减缩剂技术的发展与应用[J].混凝土,2000(10):60-63. |
| [15] | Bentz D P;Geiker M R;Hansen K K .Shrinkage-reducing admixture and early-age desiccation in cement pastes and mortars[J].Cement and Concrete Research,2001,31(02):1075-1085. |
| [16] | 张丕兴.早强低碱度硫铝酸盐水泥[J].中国建材料技,1997(04):24-28. |
| [17] | 王延生.补偿收缩新材料-复合膨胀剂[J].混凝土施工技术,1987(02):3-5. |
| [18] | 游宝坤.抗裂防渗新材料-U型凝土防水剂[J].混凝土施工技术,1987(05):11-13. |
| [19] | Mehta P K;Pirtz D.Magnesium Oxide Additive for Producing Selfstress in Mass-concrete[A].Paris,France,1980:v6-v9. |
| [20] | 楼宗汉,叶青,陈胡星,王宇清,沈锦林.水泥熟料中氧化镁的水化和膨胀性能[J].硅酸盐学报,1998(04):430-436. |
| [21] | 邓敏;崔雪华;刘元湛;唐明述 .水泥中MgO的膨胀机理[J].南京化工学院学报,1990,12(04):1-5. |
| [22] | 崔雪化;刘峥;唐明述 .掺MgO水泥的膨胀规律及其影响因素[J].南京化工学院学报,1990,21:20-24. |
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