- 苗廣營1,熊 羽2,張云必3,胡玉兵3,秦鴻根2
2016年第7期
摘要
引用本文
摘 要: 對高原環境橋用高性能混凝土的配制技術與性能進行了研究。結果表明,采用骨料級配設計技術、粉煤灰和高性能減水劑雙摻技術和引氣技術配制的C50高性能混凝土具有早強、高強和低收縮性能,同時具有良好的抗凍性能。分析表明,控制含氣量為4.5%~6.0%,氣孔的孔徑范圍為40~280μm,氣泡間距系數為120~150μm,其抗凍性均大于300次凍融循環。含氣量是提升混凝土抗凍性的重要參數,而所引入氣孔的性質也同樣重要。適當增加含氣量、減小孔徑和氣泡間距系數,可明顯提升混凝土的抗凍性能。
Abstract: The preparation technology and properties of high performance concrete are studied, which is used for bridges in the plateau environment. The results show that, the high performance concrete which use the aggregate gradation design technology, fly ash and high performance reducing water agent of double doped technology and air entraining technology have the properties of early strength and high strength and low shrinkage performance and good frost resistance which can meet the plateau environment with dry winds and freezing thawing. The analysis shows that the air content of concrete is not the only quality of decision parameters of concrete, the properties of introducing bubbles are also important. Appropriately increasing the air content, reducing the pore diameter and the spacing coefficient of the air bubble can obviously improve the frost resistance of concrete.