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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

    鋼纖維增強超高性能混凝土抗壓強度尺寸效應研究
    鋼纖維增強超高性能混凝土抗壓強度尺寸效應研究
    • 江晨暉1,2,3,周堂貴4,王利強5,張克儉4,黃 俊3,朱雨磊3
    2020年第8期
    摘要
    引用本文
    摘 ? 要:考察了3種配合比的鋼纖維增強超高性能混凝土/超高性能混凝土(UHPSFRC/UHPC)抗壓強度的尺寸效應,分析了試件尺寸、試件形狀、養護制度、齡期等因素對抗壓強度的影響,探討了以小尺寸試件替代標準試件測試UHPSFRC/UHPC抗壓強度的可行性。研究結果表明:不同尺寸和形狀試件的抗壓強度存在線性相關性,且強度修正系數宜根據強度等級予以分段考慮;圓柱體試件的抗壓強度普遍低于立方體試件;摻與不摻鋼纖維對抗壓強度尺寸效應影響較大。 Abstract: Size effects of compressive strength ultra-high performance steel fiber reinforced concrete and ultra-high performance concrete(UHPSFRC/UHPC) with three mixtures were investigated, the influence of size and shape of specimen, curing condition, and testing age on the compressive strength was analyzed, and the feasibility of testing the compressive strength of UHPSFRC/UHPC with small-sized specimens instead of standard specimens was discussed. The results show that compressive strength of specimens with different shape and size are linearly correlated each other, and the correction of compressive strength should be segmented in terms of strength class. With the similar length of width/diameter, the strength of cylinders is higher than that of cubes. The size effect of compressive strength is greatly influenced by steel fiber.
    江晨暉,周堂貴,王利強,等.鋼纖維增強超高性能混凝土抗壓強度尺寸效應研究[J].混凝土與水泥制品,2020(8):43-47. JIANG C H,ZHOU T G,WANG L Q,et al.Size Effects of Compressive Strength of Ultra-high Performance Steel Fiber Reinforced Concrete[J].China Concrete and Cement Products,2020(8):43-47.
    混雜纖維增強再生混凝土性能的試驗研究
    混雜纖維增強再生混凝土性能的試驗研究
    • 董芳菲1,徐 晉2
    2020年第8期
    摘要
    引用本文
    摘 ? 要:試驗研究了不同煅燒高嶺土取代率下纖維混摻比例(mPVA∶mBF∶mSF)對再生混凝土(RAC)抗壓強度、劈裂抗拉強度和抗折強度的影響。結果表明,隨著煅燒高嶺土取代率的增加,混雜纖維RAC的立方體抗壓強度呈先增加后減小趨勢,且當煅燒高嶺土取代率為20%時達到最大值。各煅燒高嶺土取代率下不同混摻比例的纖維對RAC劈裂抗拉強度和抗折強度的補強效果順序為:(mPVA∶mBF∶mSF=1∶1∶8)>(mPVA∶mBF∶mSF=2∶2∶6 )>(mPVA∶mBF∶mSF=3∶3∶4),且均高于基準組。鋼纖維占比越大,煅燒高嶺土和混雜纖維的協同作用對RAC抗壓強度、劈裂抗拉強度、抗折強度的補強效果越好。 Abstract: The effects of fiber blending ratio (mPVA∶mBF∶mSF) on the compressive strength, splitting tensile strength and flexural strength of recycled concrete(RAC) were studied under different replacement ratio of calcined kaolin. The results show that the cube compressive strength of hybrid fiber RAC increases first and then decreases with the increase of the replacement rate of calcined kaolin, and reaches the maximum value when the replacement rate of calcined kaolin is 20%. The reinforcement effects of fibers with different blending ratios on the splitting tensile strength and flexural strength of RAC are as follows:(mPVA∶mBF∶mSF=1∶1∶8)>(mPVA∶mBF∶mSF=2∶2∶6 )>(mPVA∶mBF∶mSF=3∶3∶4), which is higher than that of the reference group. The larger the proportion of steel fiber, the better the synergistic effect of calcined kaolin and hybrid fiber on RAC compressive strength, splitting tensile strength and flexural strength.
    董芳菲,徐晉.混雜纖維增強再生混凝土性能的試驗研究[J].混凝土與水泥制品,2020(8):48-51. DONG F F,XU J.Experimental Study on the Performance of Hybrid Fiber Reinforced Recycled Concrete[J].China Concrete and Cement Products,2020(8):48-51.
    無筋鋼纖維混凝土偏心受壓計算方法研究
    無筋鋼纖維混凝土偏心受壓計算方法研究
    • 楊 躍,譚小兵,朱占國,關永平,馮高飛
    2020年第8期
    摘要
    引用本文
    摘 ? 要:基于沈陽軌道交通9號線盾構隧道工程管片的實際受力,進行了無筋鋼纖維混凝土偏心受壓試驗,分析了構件在偏壓作用下的斷面應力分布、裂縫發展及破壞規律,提出了適合該類構件的計算方法。試驗結果表明,無筋鋼纖維混凝土構件在相對偏心距大于0.5后承載力急劇下降,即該類構件適用于相對偏心距較小的情況。在構件受力全過程中,混凝土受壓區段均處于彈性狀態?;谠囼灲Y果,提出了修正受壓區應力分布狀態的無筋鋼纖維混凝土偏壓正截面計算方法,明確了受壓區纖維混凝土強度系數的取值。 Abstract: Guiding by the actual stress of the segment of the shield tunnel project of Shenyang Rail Transit Line 9, several sets of eccentric compression tests of unreinforced steel fiber reinforced concrete were conducted, and section stress distribution and crack development of members under compression and bending were analyzed and a calculation method suitable for this kind of component was put forward. The test results show that the bearing capacity of steel fiber reinforced concrete members without steel bars decreases sharply after the relative eccentricity is greater than 0.5 and this type of members is suitable for situations where the eccentricity is small. During the entire process of the component, the concrete compression section is elastic status. Based on the experimental conclusions, a calculation method for the unstressed steel fiber reinforced concrete biased normal cross-section is put forward, and the value of the fiber reinforced concrete strength coefficient in the compressed area is determined.
    楊躍,譚小兵,朱占國.無筋鋼纖維混凝土偏心受壓計算方法研究[J].混凝土與水泥制品,2020(8):52-55,70. YANG Y,TAN X B,ZHU Z G,et al.Research on Calculation Method of Eccentric Compression of Steel Fiber Reinforced Concrete[J].China Concrete and Cement Products,2020(8):52-55,70.
    高溫下芳綸纖維混凝土力學性能試驗研究
    高溫下芳綸纖維混凝土力學性能試驗研究
    • 馮紅衛,趙利媛
    2020年第8期
    摘要
    引用本文
    摘 ? 要:配制了芳綸纖維(具有阻燃性)高性能混凝土,研究了在0、100 ℃、500 ℃、900 ℃和1 200 ℃環境下加熱2 h后不同放置時間對芳綸纖維混凝土抗壓強度的影響,并結合掃描電鏡方法分析了混凝土的微觀結構變化規律。結果表明,芳綸纖維能夠提高混凝土的耐火性;隨著芳綸纖維摻量的增加,混凝土的抗壓強度呈先增大后減小的趨勢,且纖維最佳摻量為5%;隨著溫度的升高,試件的抗壓強度均呈線性下降趨勢;低溫環境下(0、100 ℃),試件放置0 d、7 d、14 d和28 d后的抗壓強度基本相同;中高溫環境下(500 ℃和900 ℃),放置時間對纖維混凝土的抗壓強度有明顯影響;高溫環境下(1 200 ℃),纖維混凝土被燒壞,其抗壓強度隨著放置時間的延長基本不變化。 Abstract: The high performance concrete with aramid fiber (flame retardant) was prepared, and the effect of different storage time on the compressive strength of aramid fiber concrete after heating at 0, 100 ℃, 500 ℃, 900 ℃ and 1 200 ℃ for 2 hours was studied, and the scanning electron microscopy(SEM) method was used to analyze the microstructure changes of concrete. The results show that aramid fiber can improve the fire resistance of concrete, and with the content of aramid fiber increases, the compressive strength of concrete increases first and then decreases, and the optimal content of aramid fiber is 5%. With the increase of ambient temperature, the compressive strength of the specimens shows a linear downward trend. At low temperature(0, 100 ℃), the compressive strength of the specimens after 0 d, 7 d, 14 d and 28 d is basically the same. At medium and high temperature(500 ℃, 900 ℃), the storage time has a significant effect on the compressive strength. At high temperature(1 200 ℃), the fiber concrete is burned out, and the compressive strength basically does not change with the prolongation of the storage time.
    馮紅衛,趙利媛.高溫下芳綸纖維混凝土力學性能試驗研究[J].混凝土與水泥制品,2020(8):56-58. FENG H W,ZHAO L Y.Experimental Study of Mechanical Properties of Aramid Fiber Reinforced Concrete at High Temperature[J].China Concrete and Cement Products,2020(8):56-58.
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