通 过 实验 室模拟研 究不 同 湿法存放 时 间(1~6O个 月)的 2种低 钙粉 煤灰 的 形貌 、粒径和 用
于混凝 土掺 合料 的性 能变化 。粉 煤灰 湿排 后颗 粒 变粗 ,颗粒表 面 出现侵 蚀 ,但 颗 粒形 貌基 本保持 不
变 ;湿排粉 煤灰矿 物减 水效应 明显 降低 ,掺 量 为 20 ~4O 的 湿排 粉煤 灰混凝 土坍 落度 比原状粉 煤
灰 混凝 土 减 少约 2O~40 mm;掺 加 湿排 粉煤 灰 的 混凝 土与 外加 剂 适应 性 、抗渗 和抗 碳化 无明 显 变
化 ,坍 落度经 时损 失 有所 降低 ;湿 法存 放 3个月 的粉 煤灰掺 量 2o 时混凝 土 28 d和 56 d抗压 强度
比原状粉 煤灰 混凝土 分别 下降 5.8 和 3.7 ,但掺 量 为 20 的 湿法 存放 36个 月粉煤 灰 混凝 土抗
压强度 比仍 可以达到 85 ,湿 法存放 时间为 3 a和 5 a的粉煤 灰混凝 土强度 无 明显 差别 。研 究结果
表 明 ,湿排 低钙粉 煤灰 可 以用作为混 凝土掺合 料 。
关键词 :粉煤灰 ;湿排 ;混凝 土
中图分 类号 :TU 528.2 文献标 志码 :A 文章编号 :1674—4764(2009)05—0132—06
Impacts of W etting Fly Ash on the Properties of Concrete
WU Chuan-ming,QIAN Jue—shi,HOU Peng-kun,WANG Zhi,WANG Ke-jin,LUO HuJ
(College of M aterials Science and Engineering,Chongqing University,Chongqing 400045,P.R.China)
Abstract:Two types of wetting low—calcium fly ash were made for studying the performance under different
storage time (1 to 60 months). The surface morphology,granule size distribution of the wetting fly ashes
and their properties as supplem entary cem entitious materials in concrete were investigated. Although the
granule size increased and there appeared considerable erosion on the surface,the surface morphology of
wetting fly ash kept mostly unchangeable.The water reducing effect resulted from mineral properties of fly
ash decreased much due to wetting.Compared with a parallel concrete with dry fly ash,slump of concretes
with fly ash of 20~ 4O wetting for 3 m onths decreased by 2O~ 40 mm while bleeding and perm eability and
carbonation had no change.The compressive strength of concrete in 28 day and 60 days with fly ash of 30
wetting for 3 months decreased by 5.8 and 3.7 respectively. However, the specific compressive
strength of concrete in 56 days with fly ash of 20 wetting for 36 m onths still reached at 85 and there
was no visible strength discrepancy of fly ash concrete wetting for 3 and 5 years. It was concluded that a
wetting low—calcium fly ash could be used as supplementary cementitious material in some important
concretes.
Key words:fly ash;wetting;concrete
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