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    蘇州混凝土水泥制品研究院有限公司

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    纖維水泥及制品

    堿化稻草纖維對尾砂充填體力學性能的影響
    堿化稻草纖維對尾砂充填體力學性能的影響
    • 張 競,李 駿
    2022年第7期
    摘要
    引用本文
    摘 ? 要:將經過濃度為4%的NaOH溶液堿化處理過的稻草纖維作為加筋材料用于尾砂充填體試件的制備,研究了灰砂比、堿化稻草纖維的長度和摻量對尾砂充填體試件抗壓強度的影響,并借助掃描電鏡(SEM)從微觀角度分析了堿化稻草纖維的作用機理。結果表明:隨著堿化稻草纖維摻量的增加,試件的抗壓強度下降;隨著堿化稻草纖維長度的增加,試件的抗壓強度先增大后減??;未堿化稻草纖維對試件抗壓強度的降低程度顯著大于堿化稻草纖維;隨著灰砂比的減小,試件的抗壓強度降低。 Abstract: The straw fiber alkalized by 4% NaOH solution was used as reinforcement material for the preparation of tailings backfill specimens. The effects of cement-sand ratio, length and content of alkalized straw fiber on the compressive strength of tailings backfill specimens were studied, and the action mechanism of alkalized straw fiber was analyzed by SEM. The results show that the compressive strength of the specimen decreases with the increase of the alkalized straw fiber content. With the increase of the length of alkalized straw fiber, the compressive strength of the specimen first increases and then decreases. The reduction degree of the compressive strength of the specimen by the non-alkalized straw fiber is significantly greater than that of the alkalized straw fiber. With the decrease of cement sand ratio, the compressive strength of the specimen decreases.
    張競,李駿.堿化稻草纖維對尾砂充填體力學性能的影響[J].混凝土與水泥制品,2022(7):60-63. ZHANG J,LI J.Effect of Alkalized Straw Fiber on Mechanical Properties of Tailings Backfill[J].China Concrete and Cement Products,2022(7):60-63.
    玄武巖纖維混凝土動態力學性能及數值模擬
    玄武巖纖維混凝土動態力學性能及數值模擬
    • 王 嵩,劉潤清,趙 碩,孫斯慧
    2022年第7期
    摘要
    引用本文
    摘 ? 要:為了研究沖擊荷載作用下玄武巖纖維(BF)對混凝土性能的影響,采用分離式霍普金森壓桿(SHPB),在0.6 MPa沖擊氣壓作用下對不同BF體積摻量(0、0.05%、0.10%、0.15%、0.20%、0.25%、0.30%、0.35%)玄武巖纖維混凝土(BFRC)進行了沖擊壓縮試驗,并基于試驗數據,選用修正后的HJC本構模型對動態沖擊過程進行了模擬。結果表明:BFRC相較于素混凝土具有更好的抗沖擊性能,且0.30%體積摻量的BF對混凝土的增韌效果最好;修正后的HJC模型可以較好地反映出BFRC的應力、應變狀態,體現BFRC破壞過程中裂紋的發展規律,模擬結果與試驗結果吻合較好。 Abstract: In order to study the effect of basalt fiber (BF) on the performance of concrete under impact load, the impact compression test of basalt fiber reinforced concrete(BFRC) with different volume content of BF (0, 0.05%, 0.10%, 0.15%, 0.20%, 0.25%, 0.30%, 0.35%) was carried out by using split hopkinson pressure bar(SHPB) under the impact pressure of 0.6 MPa. Based on the test datas, the modified HJC constitutive model was selected to simulate the dynamic impact process. The results show that the BFRC has better impact load resistance than plain concrete, and BF with 0.30% volume content has the best toughening effect on concrete. The modified HJC model can better reflect the stress and strain state of BFRC and reflect the crack development law in the failure process of BFRC. The simulation results are in good agreement with the experimental results.
    王嵩,劉潤清,趙碩,等.玄武巖纖維混凝土動態力學性能及數值模擬[J].混凝土與水泥制品,2022(7):64-68. WANG Song, LIU Run-qing, ZHAO Shuo,et al.Dynamic Mechanical Properties and Numerical Simulation of Basalt Fiber Reinforced Concrete[J].China Concrete and Cement Products,2022(7):64-68.
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