- 摘 要
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（西安理工大學(xué)土木建筑工程學(xué)院， 西安 710048）
［摘要］在標準養(yǎng)護條件下，采用正交試驗方法，研究了砂、減水劑、水、礦物粉末、鋼纖維等材料對活性粉末混凝土材料（RPC）基本力學(xué)性能的影響。結(jié)果表明：砂膠比摻量宜控制在1-0～1-1；高效減水劑摻量控制在1-5%～2%時，對RPC的流動度有明顯影響；水膠比宜控制在0-18～0-2；砂膠比摻量應(yīng)控制在0-14～0-18；鋼纖維摻量不超過1-6%（體積比）。試驗最終獲得抗壓強度130MPa、抗折強度52-9MPa的RPC，并著重研究了RPC的抗凍融、硫酸鹽侵蝕等耐久性能。結(jié)果表明，RPC具有良好的抗凍融和硫酸鈉侵蝕性能。并通過電鏡掃描研究了RPC的孔體結(jié)構(gòu)。研究結(jié)果表明，RPC具有致密的微觀結(jié)構(gòu)，這為其超高強度和高耐久性提供了依據(jù)。
［關(guān)鍵詞］活性粉末混凝土； 抗壓性能； 耐久性能； 微觀破壞機理； 標準養(yǎng)護
中圖分類號：TU502+.6， TU528-31文獻標識碼：A文章編號：1002-848X(2018)02-0048-07
Experimental study on mechanical property and durability of reactive powder concrete
Kou Jialiang, Liu Yunhao, Zhang Haobo
(School of Civil Engineering & Architecture, Xi′an University of Technology, Xi′an 710048, China)
Abstract:The effects of sand, water reducing agent, water, mineral powder and steel fiber on the mechanical properties of reactive powder concrete (RPC) were studied by orthogonal test under the condition of standard curing. The results show that the ratio of sand and cement content should be controlled between 1-0～1-1;when adding amount of water reducing agent is controlled within 1-5%～2%, the RPC fluidity is obviously affected; water cement ratio should be controlled between 0-18～0-2; and ratio of sand and cement content should be controlled within 0-14～0-18; steel fiber content is not more than 1-6% (volume ratio). Finally, the RPC with compressive strength of 130MPa and flexural strength of 52-9MPa was obtained, and the durability of RPC such as freeze-thaw resistance and sulfate attack resistance was mainly studied. The results show that RPC has good freeze-thaw resistance and sodium sulfate erosion resistance. The pore structure of RPC was investigated by scanning electron microscopy. The results show that RPC has dense microstructure, which provides the basis for its super-high strength and high durability.
Keywords:reactive powder concrete; compressive performance; durability performance; microscopic damage mechanism; standard curing
*國家自然科學(xué)基金資助項目(51408487)，中國住建部科學(xué)技術(shù)資助項目(2014-K2-037)，中國博士后科學(xué)基金第56批面上資助項目(2014M562437),陜西省博士后科學(xué)基金資助項目,陜西省建設(shè)科技計劃項目(2016-K89)。
作者簡介：寇佳亮，博士，副教授，Email: jialiangkou0918@163.com。
