采用普通原材料制备56 d龄期抗压强度为140～160 MPa的空白组超高性能昆凝土、钢纤维超高性能混凝土及混杂纤维超高性能混凝土,测定其遭受高温作用后的残余抗压强度和劈裂抗拉强度,并对100％含湿量的混凝土试块进行高温爆裂试验.此外,测定大小2种加热速率对超高性能混凝土高温爆裂行为的影响.结果表明:所配制混凝土的残余抗压强度均随着目标温度的升高呈现先增大再降低的趋势,800℃高温后的残余抗压强度约为常温强度的30％.钢纤维与混杂纤维混凝土的残余劈裂抗拉强度亦呈现先升高再降低的趋势,800℃高温后的残余劈裂抗拉强度分别为常温强度的15.1％和35.4％.空白组混凝土的残余劈裂抗拉强度随着目标温度的升高而单调下降,800℃高温后的强度值约为常温强度的20.3％.7.5℃/min加热速率下,100％含湿量的3种混凝土试块均发生了严重高温爆裂,单掺钢纤维可以改善超高性能混凝土的高温爆裂,但不能避免爆裂的发生,而混杂纤维对超高性能混凝土高温爆裂的改善效果并未显著优于钢纤维.2.5℃/min加热速率下,混杂纤维可避免部分超高性能混凝土试块发生爆裂.
参考文献
| [1] | 朋改非;陈延年;Mike Anson.高性能硅灰混凝土的高温爆裂与抗火性[J].建筑材料学报,1999(03):193. |
| [2] | Chi-Sun Poon;Salman Azhar;Mike Anson.Comparison of the strength and durability performance of normal- and high-strength pozzolanic concretes at elevated temperatures[J].Cement and Concrete Research,20019(9):1291-1300. |
| [3] | Pierre Kalifa;Francois-Dominique Menneteau;Daniel Quenard.Spalling and pore pressure in HPC at high temperatures[J].Cement and Concrete Research,200012(12):1915-1927. |
| [4] | J.-H. Lee;Y.-S. Sohn;S.-H. Lee.Fire resistance of hybrid fibre- reinforced, ultra-high-strength concrete columns with compressive strength from 120 to 200 MPa[J].Magazine of concrete research,20126(6):539-550. |
| [5] | 林力勋;叶浩文;冯乃谦;冉志伟;令狐延;董艺.掺聚丙烯纤维改善C120超高强混凝土脆性的试验研究[J].工业建筑,2012(11):1-5. |
| [6] | Ozawa, Mitsuo;Morimoto, Hiroaki.Effects of various fibres on high-temperature spalling in high-performance concrete[J].Construction and Building Materials,2014Nov.30(Nov.30):83-92. |
| [7] | 边松华;朋改非;赵章力;易全新.含湿量和纤维对高性能混凝土高温性能的影响[J].建筑材料学报,2005(3):321-327. |
| [8] | Bing Chen;Juanyu Liu.Residual strength of hybrid-fiber-reinforced high-strength concrete after exposure to high temperatures[J].Cement and Concrete Research,20046(6):1065-1069. |
| [9] | Serdar Aydin;Halit Yazici;Buelent Baradan.High temperature resistance of normal strength and autoclaved high strength mortars incorporated polypropylene and steel fibers[J].Construction and Building Materials,20084(4):504-512. |
| [10] | C.S. Poon;Z.H. Shui;L. Lam.Compressive behavior of fiber reinforced high-performance concrete subjected to elevated temperatures[J].Cement and Concrete Research,200412(12):2215-2222. |
| [11] | Ulrich Schneider;Ulrich Diederichs;Johannes Horvath.Verhalten von Ultrahochfesten Betonen (UHPC) unter Brandbeanspruchung[J].Beton- und Stahlbetonbau,20037(7):408-417. |
| [12] | Wenzhong Zheng;Haiyan Li;Ying Wang.Compressive behaviour of hybrid fiber-reinforced reactive powder concrete after high temperature[J].Materials & design,2012Oct.(Oct.):403-409. |
| [13] | Pierre Kalifa;Gregoire Chene;Christophe Ga1le.High-temperature behaviour of HPC with polypropylene fibres From spalling to microstructure[J].Cement and Concrete Research,200110(10):1487-1499. |
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%