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    蘇州混凝土水泥制品研究院有限公司

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    發布時間:2020-01-06 00:00:00
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    第十一期

    改性硅灰、粉煤灰對超高性能混凝土(UHPC)性能的影響
    改性硅灰、粉煤灰對超高性能混凝土(UHPC)性能的影響
    • 王東明1,張世宇1,姚蘇皖1,鄒定華1,2
    2021年第11期
    摘要
    引用本文
    摘 ? 要:為降低超高性能混凝土(UHPC)黏度、提高工作性,采用輔助膠凝材料(硅灰、粉煤灰)和硅烷(γ-縮水甘油醚氧丙基三甲氧基硅烷、十二烷基三甲氧基硅烷)進行改性制備了自分散顆粒,并研究了其對UHPC工作性、抗壓強度及微觀結構的影響。結果表明:自分散顆粒降低了UHPC的黏度,提高了工作性;不同自分散顆粒對UHPC工作性的影響有較大差別,其中,粉煤灰和十二烷基三甲氧基硅烷制備的自分散顆粒效果最好;自分散顆粒抑制膠凝材料的早期水化,降低UHPC早期抗壓強度;不同自分散顆粒對UHPC的28 d抗壓強度影響也各不相同,采用粉煤灰和十二烷基三甲氧基硅烷制備的自分散顆粒提高了UHPC的28 d抗壓強度,其他自分散顆粒降低了28 d抗壓強度。 Abstract: In order to reduce viscosity and promote workability of fresh ultra-high performance concrete(UHPC), self-dispersing particles were prepared by using supplementary cementitious materials(fly ash and silica fume) modified by silanes( γ-glycidoxypropyltrimethoxysilan and dodecyltrimethoxysilane), and the workability, compressive strength and microstructure of UHPC were investigated. The results show that viscosity of fresh UHPC decreases, and the workability increases when self-dispersing particles are employed. The influence of different self-dispersing particles on workability is quite different. Self-dispersing particles prepared from fly ash modified by dodecyltrimethoxysilane show the highest effectiveness. Early age hydration of cementitious materials is inhibited by self-dispersing particles and compressive strength of UHPC decreases. Different self-dispersing particles have different effects on the 28 d compressive strength of UHPC. Self-dispersing particles prepared from fly ash and dodecyltrimethoxysilane increase the 28 d compressive strength of UHPC, while other self-dispersing particles reduce the 28 d compressive strength of UHPC.
    王東明,張世宇,姚蘇皖,等.改性硅灰、粉煤灰對超高性能混凝土(UHPC)性能的影響[J].混凝土與水泥制品,2021(11):1-5,11. WANG D M,ZHANG S Y,YAO S W,et al.Influence of Modified Silica Fume or Fly Ash on the Performance of Ultra-high Performance Concrete (UHPC)[J].China Concrete and Cement Products,2021(11):1-5,11.
    不同縫高比混凝土梁試件三點彎曲斷裂聲發射特性研究
    不同縫高比混凝土梁試件三點彎曲斷裂聲發射特性研究
    • 王 寧,石丹丹
    2021年第11期
    摘要
    引用本文
    摘 ? 要:結合聲發射技術,針對四種縫高比(0.2、0.3、0.4、0.5)的混凝土梁試件開展了單調三點彎曲斷裂試驗,探究了混凝土梁的斷裂特性和裂縫擴展機理,對比研究了不同縫高比對混凝土梁斷裂力學特性的影響。試驗結果表明,混凝土梁試件的峰值荷載會隨著縫高比的增大而降低。隨著縫高比的增大,試件裂縫張開口位移臨界值增大,而失穩斷裂韌度和斷裂能均減小。加載過程中,聲發射參數累計值均隨縫高比的減小而增大,但平均值無明顯變化規律?;趩挝粫r間聲發射撞擊數的變化,將試件單調斷裂加載過程劃分為三個階段,并給出了基于聲發射信號強度分析的混凝土結構安全區域。 Abstract: The monotonic three-point bending tests were carried out for the concrete beam specimens with the different notch-to-depth ratios (0.2, 0.3, 0.4, 0.5) by combining with acoustic emission technique. The fracture characteristics and crack propagation mechanism of concrete beam specimens were explored, and the effect of notch-to-depth ratios on the fracture mechanical properties of concrete beam was investigated. The experimental results show that the increase of notch-to-depth ratio can lead to the decrease of peak load. With the increase of notch-to-depth ratio, the critical crack opening displacement of the concrete beam specimen increases, but the instability fracture toughness and fracture energy both decrease. During the loading process, the cumulative values of acoustic emission parameters increase with the decrease of the notch-to-depth ratio, but the average values have no obvious change rule. Based on the change of acoustic emission hits per unit time, the monotonic fracture loading process of concrete beam specimens can be divided into three stages. In addition, the safe area is given according to the analysis of acoustic emission signal intensity.
    王寧,石丹丹.不同縫高比混凝土梁試件三點彎曲斷裂聲發射特性研究[J].混凝土與水泥制品,2021(11):6-11. WANG N,SHI D D.Acoustic Emission Characteristics of Three-point Bending Fracture of Concrete Beam Specimen with Different Notch-to-depth Ratio[J].China Concrete and Cement Products,2021(11):6-11.
    基于濕堆積密度方法優化設計超高性能混凝土
    基于濕堆積密度方法優化設計超高性能混凝土
    • 韓建軍1,席壯民1,盧 鵬2,郭子龍3,尹 奎4,楊龍賓5,呂亞軍5
    2021年第11期
    摘要
    引用本文
    摘 ? 要:基于最大濕堆積密度理論優化設計超高性能混凝土(UHPC)。首先,設計了25組試驗工況,分別計算出每組工況變量與最大濕堆積密度的關系,建立了最大濕堆積密度預測模型。然后,用石英粉部分替代水泥,研究了不同替代率對UHPC流動性、力學性能的影響。結果表明:預測模型與試驗結果具有較好的吻合性;UHPC的流動度隨著石英粉摻量的增加而增加,且當石英粉摻量為20%時,UHPC的抗壓強度和抗折強度最大。此外,生態評價表明,使用石英粉部分替代水泥生產UHPC,可顯著降低對環境的影響。 Abstract: Mix proportion of ultra-high performance concrete (UHPC) was optimal designed based on maximum wet packing density theory. Firstly, 25 groups of test conditions were designed, the relationship between each working condition variable and the maximum wet packing density was calculated, and the prediction model of the maximum wet packing density was established. Then, quartz powder was used to partially replace cement, and the effects of different substitution rates on the fluidity and mechanical properties of UHPC were studied. The results show that the prediction model is in good agreement with the experimental results. The fluidity of UHPC increases with the increase of quartz powder content. When the content of quartz powder is 20%, the compressive strength and flexural strength of UHPC are the largest. In addition, the ecological evaluation shows that using quartz powder to partially replace cement to produce UHPC can significantly reduce the impact on the environment.
    韓建軍,席壯民,盧鵬,等.基于濕堆積密度方法優化設計超高性能混凝土[J].混凝土與水泥制品,2021(11):12-17. HAN J J,XI Z M,LU P,et al.Optimization Design of Ultra-high Performance Concrete Based on Wet Packing Density Method[J].China Concrete and Cement Products,2021(11):12-17.
    3D打印混凝土性能的影響因素及研究進展
    3D打印混凝土性能的影響因素及研究進展
    • 張敏霞1,范開均1,徐 平1,任新鋒2,丁亞紅1
    2021年第11期
    摘要
    引用本文
    摘 ? 要:總結分析了水泥品種、摻合料及拌和物稠度對3D打印混凝土性能的影響。對比分析了不同水泥品種以及摻合料的3D打印混凝土性能的差異,提出了不同建造工況下水泥品種、摻合料的選擇方法,綜述了拌和物稠度在3D打印混凝土制備中的重要作用。此外,還提出了3D打印混凝土材料在研發中所面臨的問題和挑戰,并對未來3D打印混凝土的研究方向進行了展望。 Abstract: The impact of cement types, admixtures and consistency of the mixture on the properties of 3D printed concrete is summarized and analyzed. The performance differences of 3D printed concrete with different types of cement and admixtures are compared and analyzed. The selection methods of cement varieties and admixtures under different construction conditions are proposed. The important role of the consistency of the mixture in the preparation of 3D printed concrete is summarized. The problems and challenges of 3D printed concrete materials in the development are also proposed, and the future research direction of 3D printed concrete is pointed out.
    張敏霞,范開均,徐平,等.3D打印混凝土性能的影響因素及研究進展[J].混凝土與水泥制品,2021(11):18-22. ZHANG M X,FAN K J,XU P,et al.Influencing Factors and Research Progress on the Properties of 3D Printed Concrete[J].China Concrete and Cement Products,2021(11):18-22.
    應變率和尺寸效應對透水混凝土受壓動力性能的影響
    應變率和尺寸效應對透水混凝土受壓動力性能的影響
    • 祝秀琴1,李維麗1,張 麗2,趙志青3
    2021年第11期
    摘要
    引用本文
    摘 ? 要:為研究應變率和尺寸效應對透水混凝土受壓動力性能的影響,設置了十種應變率和三種立方體尺寸的試件,對透水混凝土展開單軸受壓力學性能試驗研究。結果表明:隨著應變率的增加,透水混凝土的抗壓強度逐漸增大;隨著立方體試件邊長的增大,應變率對透水混凝土抗壓強度的增加幅度逐漸減小,透水混凝土的抗壓強度逐漸減??;受應變率增加的影響,尺寸效應對透水混凝土抗壓強度的減小幅度逐漸增加;提出的尺寸效應律模型方程能夠較好地表述不同應變率下透水混凝土抗壓強度的尺寸效應;基于應變率和尺寸效應參數,還提出了透水混凝土抗壓強度計算方程。 Abstract: In order to explore the influence of strain rate and size effect on the dynamic performance of pervious concrete under compression, ten different loading strain rates and three different cube sizes specimen were set up. The uniaxial compression performance tests of pervious concrete were carried out. The results show that with the increase of strain rate, the compressive strength of pervious concrete gradually increases. With the increase of cube concrete specimen side length, the increase of strain rate on the compressive strength of pervious concrete gradually decreases, and the compressive strength of pervious concrete gradually decreases. Affected by the increase of strain rate, the size effect on the reduction of the compressive strength of pervious concrete gradually increases. The proposed size effect law model equation can better express the size effect of the compressive strength of pervious concrete under different strain rates. Based on the strain rate and size effect parameters, the calculation equation of the compressive strength of pervious concrete is proposed.
    祝秀琴,李維麗,張麗,等.應變率和尺寸效應對透水混凝土受壓動力性能的影響[J].混凝土與水泥制品,2021(11):23-28. ZHU X Q,LI W L,ZHANG L,et al.The Influence of Strain Rate and Size Effect on the Dynamic Performance of Pervious Concrete Under Compression[J].China Concrete and Cement Products,2021(11):23-28.
    養護溫度與粉煤灰摻量對鈣鎂復合膨脹劑膨脹效能的影響
    養護溫度與粉煤灰摻量對鈣鎂復合膨脹劑膨脹效能的影響
    • 盛智博1,于 方1,肖尹文2,楊海成1,鄧春林1
    2021年第11期
    摘要
    引用本文
    摘 ? 要:開展了養護溫度(20 ℃、40 ℃、60 ℃)和粉煤灰摻量(10%、20%、30%)對摻鈣鎂復合膨脹劑(CM)砂漿膨脹效能的影響研究,并結合微觀測試手段,分析了其影響機理。結果表明:CM對溫度較為敏感,養護溫度越高,CM水化速率越快,膨脹量增幅越大;20~60 ℃時,粉煤灰可顯著抑制CM的膨脹,且粉煤灰摻量越大,對CM的抑制作用越明顯;CM中CaO組分反應速率較快,其水化產物Ca(OH)2有效促進了MgO的水化。 Abstract: The effect of curing temperature(20 ℃, 40 ℃, 60 ℃) and fly ash content(10%、20%、30%) on the expansion performance of calcium-magnesium composite expansion agent(CM) mortar was carried out. Through the use of a series of micro-testing methods, the influence mechanism was analyzed. The results show that CM is more sensitive to temperature. The higher the curing temperature, the faster the hydration rate of CM, the greater the increase in expansion. When the curing temperature is 20~60 ℃, the expansion of CM is significantly inhibited by fly ash, and the greater the amount of fly ash, the more obvious the expansion efficiency of CM is inhibited. The CaO component of CM has a faster reaction rate. The hydration product Ca(OH)2 is an alkaline environment created by MgO, which promotes the hydration of MgO.?
    盛智博,于方,肖尹文,等.養護溫度與粉煤灰摻量對鈣鎂復合膨脹劑膨脹效能的影響[J].混凝土與水泥制品,2021(11):29-33. SHENG Z B,YU F,XIAO Y W,et al.Effect of Curing Temperature and Fly Ash Content on the Expansion Performance of Calcium-magnesium Composite Expansion Agent[J].China Concrete and Cement Products,2021(11):29-33.
    多孔結構對硫氧鎂水泥吸波性能的影響
    多孔結構對硫氧鎂水泥吸波性能的影響
    • 何 楠1,陳 樂2,周 旺1,郝萬軍2,林曦鵬1,陳海生1,3
    2021年第11期
    摘要
    引用本文
    摘 ? 要:采用物理發泡技術制備了硫氧鎂水泥復合吸波多孔材料,并對其進行了孔徑特征和電磁參數測試?;谟行Ы橘|理論和傳輸線理論,模擬了此多孔材料對8~18 GHz頻段電磁波的吸收性能。結果表明:多孔材料的孔隙率和氣孔的平均孔徑隨設計密度的增大而減??;多孔結構可以降低材料的有效介電常數,提高阻抗匹配性能;數值模擬吸波性能曲線的變化規律與測試結果基本一致。 Abstract: A composite microwave absorbing material of porous magnesium oxysulfide cement was prepared by physical foaming technology. The pore size characteristics and electromagnetic parameters of porous materials were measured and analyzed. Based on the the effective medium theory and transmission line theory, the electromagnetic wave absorption performance of porous materials in the 8~18 GHz frequency band was simulated. The results show that with the increasing density, the porosity and the average pore size of the pores in the porous material decrease. The porous structure can reduce the effective dielectric constant of the material and improve the impedance matching performance. The curve of absorbing property of numerical simulation materials is consistent with the test results.
    何楠,陳樂,周旺,等.多孔結構對硫氧鎂水泥吸波性能的影響[J].混凝土與水泥制品,2021(11):34-38. HE N,CHEN L,ZHOU W,et al.The Influence of Porous Structure on the Microwave Absorbing Properties of Magnesium Oxysulfide Cement[J].China Concrete and Cement Products,2021(11):34-38.
    混凝土比強度的主要影響因素研究
    混凝土比強度的主要影響因素研究
    • 周倩倩,謝友均,龍廣成,張思思,CHAKTRIMONGKOL Pakorn
    2021年第11期
    摘要
    引用本文
    摘 ? 要:分別研究了礦物摻合料(粉煤灰、礦渣)、養護方式對普通混凝土比強度的影響;陶粒、橡膠顆粒、聚苯顆粒對輕骨料混凝土比強度的影響以及陶砂、鋼纖維對(超)高強混凝土比強度的影響。結果表明:適量摻入礦渣,普通混凝土28 d的比強度提高更大;輕骨料混凝土的比強度分別隨陶粒、橡膠顆粒、聚苯顆粒取代率的增加而降低,其中,陶粒對輕骨料混凝土比強度的不利影響相對較??;當摻入1.5%的鋼纖維和18%的陶砂時,(超)高強混凝土的比強度提升幅度最大。 Abstract: The influence of mineral admixtures (fly ash, slag) and curing methods on the specific strength of ordinary concrete, and the influence of ceramsite, rubber particles, and polystyrene particles on the specific strength of lightweight aggregate concrete, and the influence of ceramic sand and steel fiber on the (super)high-strength concrete were studied. The results show that the proper amount of slag can improve the specific strength of ordinary concrete at 28 d age. And the specific strength of lightweight aggregate concrete decreases as the volume of aggregates replaced by ceramsite, rubber particles, and expanded polystyrene increases. The adverse effect of ceramsite on the specific strength of lightweight aggregate concrete is relatively small. When mixed with 1.5% steel fiber and 18% ceramic sand, the specific strength of (super) high-strength concrete increases the most.
    周倩倩,謝友均,龍廣成,等.混凝土比強度的主要影響因素研究[J].混凝土與水泥制品,2021(11):39-43. ZHOU Qian-qian, XIE You-jun, LONG Guang-cheng,et al.Research on Main Influencing Factors of Specific Strength of Lightweight High Strength Concrete[J].China Concrete and Cement Products,2021(11):39-43.
    CFRP內襯法加固預應力鋼筒混凝土管的內水壓力試驗研究
    CFRP內襯法加固預應力鋼筒混凝土管的內水壓力試驗研究
    • 竇鐵生1,程冰清1,2 ,夏世法1,趙麗君1,董曉農1,2
    2021年第11期
    摘要
    引用本文
    摘 ?要:通過內水壓力試驗,研究了CFRP內襯法加固預應力鋼筒混凝土管(PCCP)的結構力學性能和破壞模式,并采用光纖布拉格光柵(FBG)感測技術測試了試驗過程中PCCP各層結構和CFRP內襯的變形情況,得到了內水壓力作用下PCCP結構的力學響應規律。同時,模擬了在所有預應力失效的情況下,PCCP的力學性能及破壞情況。結果表明,在內水壓力為1.8 MPa時,PCCP原管管芯混凝土開裂,而CFRP加固管在加壓至1.9 MPa后發生開裂,表明CFRP內襯能夠有效增強管芯混凝土的延性,有效延緩管芯混凝土開裂,提高PCCP抗裂性能。同時,CFRP內襯法加固所有預應力失效的PCCP能夠承受原設計內水壓力,表明CFRP內襯能夠恢復受損嚴重PCCP的承載能力。 Abstract: The mechanical properties and failure modes of PCCP reinforced by CFRP liner were studied through the hydrostatic pressure prototype test of PCCPs. Fiber Bragg Grating (FBG) sensing technology was used to test the deformation of the PCCPs and the CFRP liner during the test, and the mechanical response law of PCCP reinforced by CFRP liner under internal water pressure was obtained. Meanwhile, ?the simulation on the failure of extreme cases where all prestress of the PCCP were carried out. The results show that the concrete core of the original pipe cracks when the internal water pressure is 1.8 MPa, while the pipe reinforced by the CFRP liner cracks after the pressure is 1.9 MPa. CFRP liner can enhance the ductility, effectively delay the cracking of the concrete core, and improve the strength and crack resistance of the PCCP. The PCCP without prestress reinforced by CFRP liner can bear the original design internal water pressure, indicating that CFRP liner can restore the original bearing capacity of a PCCP with serious damage.?
    竇鐵生,程冰清,夏世法,等.CFRP內襯法加固預應力鋼筒混凝土管的內水壓力試驗研究[J].混凝土與水泥制品,2021(11):44-48. DOU T S,CHENG B Q,XIA S F,et al.Study on Hydrostatic Pressure Testing of PCCP Strengthened by CFRP Liner[J].China Concrete and Cement Products,2021(11):44-48.
    預制混凝土襯砌管片模具自動開合裝置的研發
    預制混凝土襯砌管片模具自動開合裝置的研發
    • 尹懷秀,莊慧顯,王彥濤
    2021年第11期
    摘要
    引用本文
    摘 ? 要:為提高預制混凝土襯砌管片生產效率,結合自動化生產需要,針對手動開合模存在的不足,研發了自動化開合模裝置,并介紹了端模、側模開合原理及操作步驟,可為提高管片生產線自動化程度提供參考。 Abstract: In order to improve the reinforced concrete segment production efficiency, combined with the needs of automatic production, aiming at the shortcomings of manual mould opening and closing, an automatic mould opening and closing device is developed, and the opening and closing principles and operation steps of end mold and side mould are described respectively, which can provide a reference for improving the automation of segment production line.
    尹懷秀,莊慧顯,王彥濤.預制混凝土襯砌管片模具自動開合裝置的研發[J].混凝土與水泥制品,2021(11):49-50,54. YIN H X,ZHUANG H X,WANG Y T.Research on Automatic Opening and Closing Device of Reinforced Concrete Segment Mould[J].China Concrete and Cement Products,2021(11):49-50,54.
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