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    蘇州混凝土水泥制品研究院有限公司

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    第四期

    干濕循環作用下PVA-FRCC氯離子侵蝕深度研究
    干濕循環作用下PVA-FRCC氯離子侵蝕深度研究
    • 劉曙光1,尹立強2,閆長旺1,王志偉3
    2015年第4期
    摘要
    引用本文
    摘 要:通過聚乙烯醇纖維增強水泥基復合材料(polyvinyl alcohol fiber reinforced cementitious composite,PVA-FRCC)和普通混凝土在干濕交替條件下的氯鹽侵蝕試驗,研究了干濕循環次數、纖維體積摻量、溫度梯度對PVA-FRCC氯離子侵蝕深度的影響,并從水泥基內部孔隙結構和微裂縫兩個主要方面進行了機理分析。結果表明,隨干濕循環次數的增加,PVA-FRCC與普通混凝土氯離子侵蝕深度均在增大,且PVA-FRCC氯離子侵蝕深度和侵蝕速度均比普通混凝土的低,隨著纖維摻量從0~2%增加,PVA-FRCC氯離子侵蝕深度總體呈降低趨勢;隨著干循環溫度以20℃、40℃、60℃的梯度升高,PVA-FRCC氯離子侵蝕深度增大,纖維摻量為2%的PVA-FRCC表現出較好的抗氯鹽侵蝕能力。 Abstract: The corrosion resistance of polyvinyl alcohol fiber reinforced cementitious composite (PVA-FRCC) and concrete in chloride environments is investigated via dry-wet test. The influence of dry-wet cycles, content of fiber and temperature gradient on the depth of chloride corrosion of PVA-FRCC is analyzed,and cement-based internal pore structure and micro crack are analyzed on mechanism. The results show that the chloride ions corrosion depth of PVA-FRCC and concrete increase with the increase of cycle number under double environment of dry-wet cycle, and chloride ion corrosion depth and corrosion rate of PVA-FRCC are lower than that of normal concrete. With the fiber content increasing from 0~2%, PVA-FRCC chloride ion corrosion depth becomes decreasing trend. With the dry circulating temperature gradient of 20℃, 40℃ to 60℃ elevating, chloride ion corrosion depth of PVA-FRCC increases, and PVA-FRCC with 2% PVA fiber shows better resistance to chloride corrosion.
    新型水泥基吸波材料的性能分析研究
    新型水泥基吸波材料的性能分析研究
    • 高 翔1,孫亞飛2,耿 飛2,徐少云2
    2015年第4期
    摘要
    引用本文
    摘 要:通過三層設計,使新型水泥基吸波材料與空間波阻抗實現良好的匹配,并具有優良的電磁波損耗特性,測試了新型吸波材料的吸波性能和抗壓強度。研究表明,該水泥基吸波板反射率均低于-5.9dB,最小反射率出現在4.5GHz,達-22.4dB;小于-10dB有效帶寬為10.8GHz,占整個波段63.3%;水泥基吸波材料28d抗壓強度為49.2MPa,較基準的降低了15%。 Abstract: By triple designing, absorbing materials make it possible that match with space wave impedance, which has excellent electromagnetic loss characteristics. The absorbing properties and compressive strengths of cement-based materials were investigated. Results showed that the reflectivity of triple-layer cement based absorbing panel was lower than-5.9dB in the frequency range of 2~18GHz, and the minimum reflectance was -22.4dB in 4.5GHz. Less than -10dB effective bandwidth was about 10.8GHz, which covered 63.3% of the whole bandwidth. The compressive strength of cement based absorbing material was 49.2MPa curing at 28 days, and it was reduced by 15% than that of the based specimen.
    葡萄糖酸鈉改善加氣混凝土廢渣-水泥體系性能及其硬化體微觀結構研究
    葡萄糖酸鈉改善加氣混凝土廢渣-水泥體系性能及其硬化體微觀結構研究
    • 沈玉華1,史星祥2,潘志華3
    2015年第4期
    摘要
    引用本文
    摘 要:以加氣混凝土(ALC)廢渣作為水泥混合材,通過摻加少量緩凝劑葡萄糖酸鈉,來改善ALC渣-水泥體系流動性和力學性能,并且使用XRD、TG-DSC、MIP、SEM等來分析硬化體的水化產物和微觀結構。結果表明,葡萄糖酸鈉可以明顯改善體系流動性,在ALC渣摻量為5%的條件下,摻加0.04%葡萄糖酸鈉,體系流動度為230cm,達到純水泥試樣性能指標;28d抗壓強度為59.9MPa,較不摻加葡萄糖酸鈉時略有提高。同時,XRD、TG-DSC與SEM測試表明,摻加葡萄糖酸鈉的試樣有更多的Ca(OH)2與C-S-H凝膠生成,水化產物間隙減少且相互交接在一起,體系密實性提高;MIP結果顯示,葡萄糖酸鈉有利于降低體系的孔隙率,改善孔結構。 Abstract: The improvement effect of sodium gluconate on the fluidity and mechanical properties of autoclaved lightweight concrete (ALC) waste-cement system was studied, and the hydration products and microstructure of the hardened cement paste were characterized by XRD, TG-DSC, MIP and SEM. The results show that appropriate content of sodium gluconate can significantly improve the fluidity of the system. When the content of ALC waste is 5%, the fluidity of the system is 230cm by adding 0.04% sodium gluconate, which can meet the performance index of pure cement, and its 28d compressive strength can reach to 59.9MPa, which is higher than that of the samples without sodium gluconate. Meanwhile, the results of XRD, TG-DSC and SEM indicate that much more Ca(OH)2 and C-S-H gel, smaller gap and higher compactness appear in the hydration products of the samples with sodium gluconate. The MIP result shows that sodium gluconate is favorable to reduce the porosity and improve the pore structure of ALC waste-cement system.
    冰雪災害性天氣后南京長江第二大橋結構混凝土損傷評估研究
    冰雪災害性天氣后南京長江第二大橋結構混凝土損傷評估研究
    • 趙 暉1,2,3,梁新政2,3,張宇峰2,3
    2015年第4期
    摘要
    引用本文
    摘 要:冰雪災害天氣下凍融損傷和使用融雪劑會對橋梁結構混凝土性能有一定影響。本文對冰雪災害天氣后南京長江第二大橋不同結構部位混凝土外觀、力學性能、碳化深度、鋼筋保護層厚度、混凝土氯離子含量進行檢測,與冰雪災害天氣前結構混凝土各項性能進行對比,對南京長江二橋結構混凝土損傷狀況進行評估。檢測結果表明,冰雪災害性天氣使結構混凝土可見裂縫數量增加,裂縫寬度有進一步擴展趨勢,結構混凝土強度、碳化深度、混凝土保護層厚度變化不大,冰雪災害天氣后混凝土中氯離子含量比冰雪災害天氣前混凝土氯離子含量有所增加。冰雪災害天氣對南京長江二橋各個結構部位混凝土損傷較小。 Abstract: Freezing and thawing damage, deicing chemicals have larger effect on the properties of structure concrete. In this paper, after ice and snow disaster weather, the appearance, mechanical properties, carbonation depth, the protective layer and the chloride ion content of the concrete at difference structural region of Second Yangtze River Bridge in Nanjing were tested, compared to those at the begain of ice and snow disaster weather, the damage state of structure concrete was thoroughly evaluated. The test results showed that the ice and snow disaster weather result in the more amout concrete crack and the wider concrete crack, the mechanical properties, the carbonation depth, the protective layer of the concrete have not significant change, the chloride ion content of the concrete after ice and snow disaster weather increase. The ice and snow disaster weather has a smaller damage on the properties of the concrete at difference structural region.
    五峰漢陽河特大橋C50自密實微膨脹鋼管混凝土配合比設計與應用
    五峰漢陽河特大橋C50自密實微膨脹鋼管混凝土配合比設計與應用
    • 劉洪波
    2015年第4期
    摘要
    引用本文
    摘 要:五峰漢陽河特大橋為主跨171m的上承式鋼管混凝土拱橋。C50自密實微膨脹鋼管混凝土的性能對拱橋的施工質量非常重要,為保證山區復雜條件下鋼管混凝土的順利施工,通過調整減水劑性能及膨脹劑摻量,對混凝土配合比進行設計及優化,最終獲得了性能優良的配合比,為鋼管混凝土的順利灌注提供了有力保障。 Abstract: The HanYang River Grand Bridge of Wufeng is a steel-tube arch concrete bridge, the main span of this bridge is 171m. Micro-expansion and self-compacting C50 concrete is essential to the construction quality of this bridge. To guarantee the workability of steel-tube concrete under the complex conditions of mountain areas, by the means of adjustment of water-reducer and expansive-agent, the excellent performance of concrete mix is obtained, which can provide the guarantee of the filling of steel-tube concrete.
    混凝土裂縫修復劑的研制與應用研究
    混凝土裂縫修復劑的研制與應用研究
    • 朱 華1,陳曉龍1,張曉華1,葛曉紅2
    2015年第4期
    摘要
    引用本文
    摘 要:為了克服水泥裂縫修復材料的不足,通過環氧樹脂和氫化雙酚A 環氧樹脂、活性稀釋劑、固化劑及偶聯劑等物質,研制出用于修復靜止裂縫和活動裂縫的兩種低粘度裂縫修復用灌漿材料。 Abstract: In order to overcome the shortage of cement cracks repairing material, through hydrogenated bisphenol A epoxy resin and epoxy resin, reactive diluent, curing agents, coupling agents and other substances, two low viscosity cracks repairing grouting materials are prepared for repairing static cracks and active cracks.
    避免延遲鈣礬石膨脹型免蒸壓管樁摻合料
    避免延遲鈣礬石膨脹型免蒸壓管樁摻合料
    • 桂志偉,林志翔,孫 蓓
    2015年第4期
    摘要
    引用本文
    摘 要:養護溫度大于70℃的混凝土制品有產生延遲鈣礬石膨脹的風險。為避免免蒸壓管樁也產生這種風險,利用新型高強摻合料拌合的混凝土,經70℃的蒸汽養護6h,試塊能滿足C80的強度要求。與不摻相比,新型高強摻合料的摻入能大幅提高混凝土的抗壓強度和耐久性。微觀分析表明,摻新型高強摻合料的混凝土內部生成了大量的纖維狀Ⅰ型C-S-H,填充了內部孔隙,從而提高了混凝土的強度和耐久性。 Abstract: Concrete products under the curing temperature over 70℃ have the risk of expansion damage from delayed ettringite formation. In order to avoid such risk on non-autoclaved piles, C80 concrete were made by a new type of high strength admixture, and the curing temperature was kept at 70℃. With such admixture, the compressive strength and durability of the concrete were improved. Microscopic analysis showed that such admixture can help cement to produce massively fibrousⅠtype of C-S-H gel, which filled the pores inside of the concrete to improve the strength and durability.
    增強型預應力管樁與普通預應力管樁單樁抗拔靜載試驗的對比分析
    增強型預應力管樁與普通預應力管樁單樁抗拔靜載試驗的對比分析
    • 張芳芳1,李 建2,牛志榮3,周兆弟4
    2015年第4期
    摘要
    引用本文
    摘 要:通過對同場地、同強度、等外徑的兩根普通預應力管樁和兩根增強型預應力管樁進行現場單樁抗拔靜載試驗,對比分析了U-δ(上拔荷載-上拔量)曲線和受力特征。試驗結果表明,增強型管樁的U-δ曲線比較平緩,抗拔承載力比普通管樁提高70.53%,抗拔能力更理想。 Abstract: Based on the static uplift loading test of four piles(two enhanced prestressed concrete piles and two ordinary prestressed concrete piles) with same external diameter and strength in the same place, their U(load)~δ (ascending displacement)curves and load transmission mechanism are analyzed comparatively. The results show that the U~δ curves of the enhanced prestressed concrete piles have a gentler gradient, and their ultimate bearing capacities are 70.53% higher than those of the ordinary piles, so their uplift capability are more discerning.
    CRTSⅡ型無砟軌道板專用數控磨床定位分析
    CRTSⅡ型無砟軌道板專用數控磨床定位分析
    • 韓彥軍1,張 宇1,白曉軍2
    2015年第4期
    摘要
    引用本文
    摘 要:通過對CRTSⅡ型無砟軌道板專用數控磨床定位點及支撐力的理論分析,確定了CRTSⅡ型無砟軌道板在專用數控磨床磨削中定位點的合理位置,以及各支撐液壓缸支撐力的大小分配比,使CRTSⅡ型無砟軌道板能夠在所受彎矩均勻、正應力最小的狀態下進行磨削,從而減小了自身內部應力的影響,提高了CRTSⅡ型無砟軌道板的磨削質量。 Abstract:By theoretical analysis, the reasonable locations of the anchor points and the magnitude of force in the hydraulic cylinders are determined in the special CNC grinding machine for grinding the CRTSⅡrail board.It enables the board to be grinded in a state under the condition of uniform bending moment and the smallest normal stress, so that it reduces the influence of its own internal stress and improves the grinding quality.
    人工凍土灌注樁樁身溫度場及混凝土強度試驗研究
    人工凍土灌注樁樁身溫度場及混凝土強度試驗研究
    • 孟文清,王相立,張亞鵬,崔邯龍
    2015年第4期
    摘要
    引用本文
    摘 要:采用物理模型試驗方法,對人工凍土條件下混凝土灌注樁進行了樁身溫度場監測及混凝土強度檢測,并基于試驗數據,研究了人工凍土中灌注樁樁身溫度場發展規律和混凝土強度增長特性,可為人工凍土條件下混凝土灌注樁的施工提供技術指導。 Abstract: The temperature field of cast-in-place concrete pile in artificial frozen soil is detected by using physical model tests. Based on the test data of concrete strength, the development rule of the pile temperature field in artificial frozen soil and the growth feature of concrete strength are obtained. The results can provide technical guidance for future construction of cast-in-place concrete pile in artificial frozen soil.
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