采用碳化试验和干燥收缩试验相结合,研究了轻骨料混凝土在碳化作用下的干缩变形发展规律及其影响因素.结果表明,加速碳化作用下,轻骨料混凝土的干缩变形显著增长,而随着矿物掺合料的掺入,干缩率得到一定程度的抑制,其中掺超细粉煤灰轻骨料混凝土碳化干缩率最小；骨料预湿完全条件下轻骨料混凝土水胶比越大,碳化干缩变形越大；轻骨料混凝土在高浓度CO2加速碳化作用下干缩变形显著高于自然碳化混凝土；而在相对湿度50％条件下碳化时,其干缩率要大于其它湿度条件下的试样；另外,轻骨料预湿后混凝土碳化干缩率要低于未预湿轻骨料混凝土.因此,在实际工程中,选择合适的矿物掺合料、水胶比、养护条件以及骨料的预湿工艺对轻骨料混凝土的减缩防裂具有较好的效果.
参考文献
| [1] | 胡曙光;王发洲.轻集料混凝土[M].北京:化学工业出版社,2006 |
| [2] | Dale P. Bentz .Influence of internal curing using lightweight aggregates on interfacial transition zone percolation and chloride ingress in mortars[J].Cement & concrete composites,2009(5):285-289. |
| [3] | Niyazi Ugur Kockal;Turan Ozturan .Optimization of properties of fly ash aggregates for high-strength lightweight concrete production[J].Materials & design,2011(6):3586-3593. |
| [4] | Kayali O;Zhu B .Chloride induced reinforcement corrosion in lightweight aggregate high-strength fly ash concrete[J].Construction and Building Materials,2005,19(04):327-336. |
| [5] | 王萧萧,申向东.不同掺量粉煤灰轻骨料混凝土的强度试验研究[J].硅酸盐通报,2011(01):69-73,78. |
| [6] | MehtaPK;Monteiro P J M;覃维祖;王栋民,丁建彤.混凝土微观结构、性能和材料[M].北京:中国电力出版社,2008 |
| [7] | 冯乃谦;邢峰.混凝土与混凝土结构的耐久性[M].北京:机械工业出版社,2009 |
| [8] | Min-Hong Zhang;Lian Li;P. Paramasivam .Shrinkage of High-Strength Lightweight Aggregate Concrete Exposed to Dry Environment[J].ACI materials journal,2005(2):86-92. |
| [9] | Pipat Termkhajornkit;Toyoharu Nawa;Masashi Nakai .Effect of fly ash on autogenous shrinkage[J].Cement and Concrete Research,2005(3):473-482. |
| [10] | Daniel Cusson;Ted Hoogeveen .Internal curing of high-performance concrete with pre-soaked fine lightweight aggregate for prevention of autogenous shrinkage cracking[J].Cement and Concrete Research,2008(6):757-765. |
| [11] | L.Li;A.A.Sagues .In situ leaching investigation of pH and nitrite concentration in concrete pore solution[J].Cement and Concrete Research,1999(3):315-321. |
| [12] | Brouwers H J H;Eijk R J V .Al kali concentrations of pore solution in hydration OPC[J].Cement and Concrete Research,2003,33(02):191-196. |
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