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昆明冶金高等专科学校学报 ›› 2016, Vol. 32 ›› Issue (3): 36-40.DOI: 10. 3969/j. issn. 1009—0479.2016.03.007

• 建筑设计与土建施工 • 上一篇    下一篇

低等级粉煤灰对混凝土流动性和强度的影响

韩长菊   

  1. 昆明冶金高等专科学校建材学院,云南昆明650033
  • 收稿日期:2016-04-08 出版日期:2016-07-23 发布日期:2016-07-23
  • 作者简介:韩长菊(1972-),女,云南昆明人,讲师,工学硕士,主要从事无机非金属材料研究。
  • 基金资助:

    昆明冶金高等专科学校科研基金项日:低等级粉煤灰在混凝土中的应用研究(14B003 )

The Effect of Low-grade Fly Ash on Fluidity and Strength of Concrete

HAN Changju   

  1. Faculty of Building Materials, Kunming Metallurgy College, Kunming 650033, China
  • Received:2016-04-08 Online:2016-07-23 Published:2016-07-23

摘要:

        为研究低等级粉煤灰对混凝土流动性和强度的影响,以粉煤灰等量取代水泥量(质量分数,下同)为0、10%、20%和30%,制备C20、C30、C40 3个等级的混凝土,检测各个编号混凝土的流动性和强度。试验结果表明:低等级粉煤灰掺入对混凝土的流动性是有利的,随着粉煤灰掺量增加,混凝土的7d、28 d抗压和劈裂抗拉强度逐渐降低,C30、C40混凝土的56 d抗压和劈裂抗拉强度逐步接近基准混凝土,但C20混凝土的56d抗压强度与基准混凝土相差较大。

关键词: 粉煤灰, 混凝土, 流动性, 强度

Abstract:

     To study the influence of low-grade fly ash on the concrete strength and liquidity, three grades concrete of C20, C30 and C40 were prepared by using equal amount of fly ash to replace cement content of 0, 10%, 20% and 30% (mass fraction, the same below). The fluidity and strength of each number of concrete were tested. The results show that low-grade coal ash is advantageous to the liquidity of concrete. With the increase of the dosage of fly ash, 7d, 28d compressive and splitting tensile strength decreases gradually, 56d compressive and splitting tensile strength of C30 and C40 is closed to the reference concrete, but the 56d compressive strength of C20 concrete is different from that of reference concrete.

Key words: font-size: 10.5pt, mso-bidi-font-size: 12.0pt, mso-fareast-font-family: 宋体, mso-font-kerning: 1.0pt, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA"> font-size: 10.5pt, mso-bidi-font-size: 12.0pt, mso-fareast-font-family: 宋体, mso-font-kerning: 1.0pt, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA" lang="EN-US">fly ash, concrete, fluidity, strength

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