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    蘇州混凝土水泥制品研究院有限公司

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    第十二期

    復合摻合料和聚合物對鋼渣-碎石透水混凝土性能的影響
    復合摻合料和聚合物對鋼渣-碎石透水混凝土性能的影響
    • 黃凱健,何若楠,盧 政,王元綱,張高勤,胡亞風
    2018年第12期
    摘要
    引用本文
    摘 要:通過強度和收縮率試驗、SEM分析,研究了復合摻合料和聚合物對鋼渣-碎石透水混凝土強度、收縮性和微觀結構的影響。結果表明,摻30%復合摻合料(硅灰與礦渣微粉復合)提高了鋼渣-碎石透水混凝土的抗壓強度和抗折強度,并可達到C30的要求;摻5%聚合物乳液進一步提高了鋼渣-碎石透水混凝土的28 d強度,并顯著降低了收縮率;摻入聚合物乳液后,加強了硬化水泥漿體內水化產物之間的聯結作用,減少了毛細孔隙,有效改善了微觀結構。 Abstract: Effect of compound admixture and polymer on strength, shrinkage and microstructure of steel slag-gravel pervious concrete was studied based on the strength test, shrinkage test and SEM analysis. The results show that by adding compound admixture composited with silica fume and slag powder, which content is 30% of cement content, the compressive strength and flexural tensile strength of the concrete samples increase and can meet the requirements of C30. By adding polymer emulsion which content is 5% of cement content, the 28 d strength of steel slag-gravel pervious concrete increases further and its shrinkage reduces significantly. When polymer emulsion is added in hardened cement slurry of steel slag-gravel pervious concrete, the connection between hydrated products is strengthened and the number of capillary porosity decreases, so microstructure of hardened cement slurry is also modified.
    透水混凝土研究進展及廢棄物骨料對其力學性能的影響
    透水混凝土研究進展及廢棄物骨料對其力學性能的影響
    • 劉志峰1,石丹丹2,周斌斌2,宣衛紅1
    2018年第12期
    摘要
    引用本文
    摘 要:簡述了透水混凝土的工作性及孔結構參數對滲透性能的影響,總結了透水混凝土的力學性能,包括抗壓強度、抗彎強度、彈性模量、動態及疲勞性能、抗凍融耐久性等方面的研究進展。研究了再生骨料、廢棄橡膠、鋼渣三類廢棄物做骨料對透水混凝土的力學性能的影響。試驗結果表明,摻入再生骨料和橡膠顆粒降低了透水混凝土的抗壓和抗拉強度;鋼渣透水混凝土的抗壓強度低于普通骨料透水混凝土,但彎拉強度較高。 Abstract: The working performance of pervious concrete and the influence of porosity on permeability are introduced. The mechanical properties, including compressive strength, bending strength, elastic modulus, dynamic and fatigue properties, freeze-thaw durability are summarized especially. The effects of three types of waste material on the mechanical properties of permeable concrete are studied, such as recycled aggregate, waste rubber and steel slag. The results show that incorporation of recycled aggregate and rubber particles could reduce the compressive and tensile strength of permeable concrete. The compressive strength of steel slag permeable concrete is lower than that of ordinary aggregate permeable concrete, but the flexural strength is higher.
    海水環境下鋁酸鹽水泥基材料的抗蝕性能研究
    海水環境下鋁酸鹽水泥基材料的抗蝕性能研究
    • 桂 雨1,廖宜順1,袁正夏1,徐鵬飛1,林 術1,楊華美2
    2018年第12期
    摘要
    引用本文
    摘 要:研究了海水環境下鋁酸鹽水泥與單摻硅灰、礦渣組成的復合水泥漿體的抗壓強度和水化產物變化規律。結果表明,海水對鋁酸鹽水泥具有侵蝕作用;摻入礦物摻合料能夠促進鋁酸鹽水泥的水化,改善水泥漿體孔隙結構,生成水化鈣鋁黃長石等水化產物,有利于漿體結構密實和強度發展,進而提高鋁酸鹽水泥強度及抗蝕性能,且隨著礦物摻合料摻量的增多,抗蝕性能逐漸提升。與礦渣相比,硅灰對提高鋁酸鹽水泥抗蝕性能具有更好的效果,海水環境下摻入10%硅灰,28 d抗壓強度最高,超過淡水環境下空白組。 Abstract: The compressive strength and hydration product of the composite cement paste composed of calcium aluminate cement, silica fume and slag in seawater environment were studied. The results show seawater has a certain ability to erode calcium aluminate cement. The incorporation of mineral admixtures can promote the hydration of aluminate cement, improve the pore structure of cement paste, generate hydration products, such as hydration gehlenite, which is beneficial to the structure and strength of paste and improve the strength and corrosion resistance of aluminate cement. So the corrosion resistance of aluminate cement is improved, and with the mineral admixture content increasing, corrosion resistance gradually increases. Compared with the slag, silica fume has a better effect to improve the corrosion resistance of aluminate cement. In seawater condition, 28 d strength of the cement paste mixed with 10% silica fume is higher than that of control group in freshwater condition. Mineral admixtures affect the hydration process of calcium aluminate cement by physical and chemical means.
    鎳渣在干混普通砌筑砂漿中的應用研究
    鎳渣在干混普通砌筑砂漿中的應用研究
    • 徐風廣,李紅偉,楊鳳玲,侯海軍,蔣金科
    2018年第12期
    摘要
    引用本文
    摘 要:研究將破碎后的固體工業鎳渣作為細骨料來制備干混普通砌筑砂漿。結果表明,與天然石英砂相比,鎳渣具有堅固性能好、壓碎指標值低、吸水率高、有害物質含量少、堿骨料反應膨脹率低、表面硬度高、耐磨性能好、壓縮程度高、具有火山灰活性等特點,用其作為細骨料制備干混普通砌筑砂漿,其各項性能均滿足GB 14684—2011《建設用砂》標準要求。與M30天然石英砂干混普通砌筑砂漿相比,M30鎳渣干混普通砌筑砂漿7 d及28 d抗壓強度分別提高了7.7%和9.3%,凍融循環質量損失率和強度損失率分別降低了1.1%和4.3%,保水率提高了2.6%,14 d及28 d收縮率分別降低了0.004%和0.023%。且用鎳渣作骨料制備的干混砌筑砂漿還具有生產成本低、節約資源、保護環境等多重作用。 Abstract: The crushed solid industrial nickel slag was used as fine aggregate for the preparation of dry-mixed ordinary masonry mortar. The study results indicate that compared with natural quartz sand, the nickel slag has stronger properties, lower crush index value, higher water absorption, lower content of harmful substances, lower rate of expansion of alkali-aggregate reaction, higher surface hardness, better abrasion resistance, higher degree of compression, pozzolanic activity and so on. The properties of nickel slag as fine aggregate for the dry-mixed ordinary masonry mortar can meet the requirements specified in the GB 14684—2011 Sand for construction. Compare the M30 dry-mixed ordinary masonry mortar prepared with nickel slag and natural quartz sand as aggregate, the 7 d and 28 d compressive strength of the former increase by 7.7% and 9.3% respectively. The freeze-thaw test quality loss rate and strength loss rate of the former decrease by 1.1% and 4.3% respectively. The water retention rate of former increase by 2.6%, and its 14 d and 28 d shrinkage rate decrease by 0.004% and 0.023% respectively. In addition, the dry-mixed ordinary masonry mortar with nickel slag also has multiple functions, such as low production cost, saving resources of natural quartz sand and limestone and protecting the environment.
    可再分散乳膠粉與硅灰改性水泥基透水混凝土性能對比研究
    可再分散乳膠粉與硅灰改性水泥基透水混凝土性能對比研究
    • 駱靜靜1,張磊蕾2,劉遠祥1,滿麗瑩1
    2018年第12期
    摘要
    引用本文
    摘 要:采用硅灰和可再分散乳膠粉對透水混凝土進行改性,研究了兩者對透水混凝土漿體擴展度、力學性能、透水性能和抗凍性能的影響。結果表明,硅灰會提高漿體的黏度、降低漿體的擴展度,提高透水混凝土的力學性能和抗凍性能,但會降低其透水性能,脆性增大,推薦硅灰摻量為2%~4%;可再分散乳膠粉會改變漿體黏度,調節透水混凝土漿體的工作狀態,降低透水混凝土強度,改善透水混凝土的脆性,推薦可再分散乳膠粉的摻量為2%~4%,可以獲得較好的綜合性能。 Abstract: The effects of silica fume and redispersible polymer powder on the slurry expansion, mechanical properties, water permeability and freezing resistance of permeable concrete were studied. The experiment results show silica fume can increase the viscosity of the slurry, reduce the expansion of the slurry, improve the mechanical properties and frost resistance of the permeable concrete; but may decrease the permeability and increase the brittleness of the permeable concrete. Recommended content of silica fume for using in permeable concrete is in the range of 2% to 4%. The air-entraining effect and surfactant composition of latex powder can change the viscosity of the slurry and adjust the working state of the permeable concrete, will result in the decrease of the strength of the permeable concrete, but can improve the brittle failure characteristics of the permeable concrete. The recommended amount of latex powder for using in permeable concrete is in the range of 2% to 4%, and the better comprehensive performance can be obtained.
    改性MKPC漿體抗氯離子滲透性能研究
    改性MKPC漿體抗氯離子滲透性能研究
    • 李 濤1,楊建明2,徐玉芬1,王繼果1
    2018年第12期
    摘要
    引用本文
    摘 要:為了研究磷酸鉀鎂水泥基材料(MKPC)抗氯離子的滲透性能,通過采用RCM法,以MKPC基材料漿體為基準,研究了單摻、雙摻硅灰和石灰石粉等礦物摻合料對MKPC漿體抗氯離子滲透性能的影響以及不同養護齡期對其抗氯離子滲透的影響。結果表明:摻入礦物摻合料可改善MKPC漿體抗氯離子滲透性能,其中,以雙摻礦物摻合料的MKPC基材料漿體抗氯離子的性能為最佳;MKPC基材料漿體養護齡期越短抗氯離子滲透性能越好。 Abstract: In order to study the chloride ion permeability of potassium magnesium phosphate cement(MKPC)based composite materials, by using the method of RCM, taking potassium magnesium phosphate cement slurry as a benchmark, the effect of single doped and double doped of silica fume and limestone on the anti chloride ion permeability of phosphorus acid potassium magnesium cement slurry and the effects of different ages on the resistance to chloride ion penetration were tested and studied. The results show that the incorporation of mineral admixtures can improve potassium magnesium phosphate cement slurry resistance to chloride ion permeability; the performance with the double mineral admixture of potassium magnesium phosphate cement slurry chloride is the best; the shorter the curing period of potassium magnesium phosphate cement slurry, the better resistance to chloride ion permeability.
    自密實混凝土在預制構件中的應用
    自密實混凝土在預制構件中的應用
    • 田培云
    2018年第12期
    摘要
    引用本文
    摘 要:將自密實混凝土應用于預制橋梁構件和預制箱涵生產中,探討了自密實混凝土配合比設計要點,新拌、硬化后混凝土性能,以及澆筑成型該類構件的工藝方法。結合實際生產情況,給出了自密實混凝土應用存在的問題及建議。 Abstract: The application of self-compacting concrete to prefabricated bridge components and prefabricated box culvert production is studied, the main points of mix design of self-compacting concrete, the concrete performance of new mixing and hardening, and the process method of pouring and forming such component are discussed. In the actual production situation, the problems and suggestions of self-compacting concrete application are put forward.
    凝土塑性損傷模型參數在預制樁中的研究及應用
    凝土塑性損傷模型參數在預制樁中的研究及應用
    • 趙偉華
    2018年第12期
    摘要
    引用本文
    摘 要:對ABAQUS預制樁混凝土塑性損傷模型和GB 50010—2010《混凝土結構設計規范》中的混凝土本構關系參數進行了計算,對比分析了計算結果與試驗結果,并驗證了混凝土損傷塑性模型參數設置的正確性及在非線性分析中的可靠性,為鋼筋混凝土結構精細化非線性有限元分析提供參考。 Abstract: Based on the concrete constitutive relationships provided by the GB 50010—2010 Code for Design of Concrete Structure, the materials' parameters calibration and verification of prestressed precast pile concrete damage plasticity model were studied by introducing the damage factors. To verify the reliability of CDP model applied to the non-linear analysis of concrete structure, a prestressed precast concrete pile is modeled precisely. Some valuable advices were promoted for accurate finite element analysis of reinforce concrete structures using this model.
    重慶軌道交通環線地鐵管片注漿吊裝孔破壞原因分析
    重慶軌道交通環線地鐵管片注漿吊裝孔破壞原因分析
    • 張 朋,楊冬梅
    2018年第12期
    摘要
    引用本文
    摘 要:針對吊裝注漿孔破壞原因分析方法的研究不足,提出了破壞原因推導方法。該方法由管片破壞類型推導出可能導致吊裝注漿孔破壞的原因,再結合設計、生產和安裝全過程分析,最終得出破壞形成因素,制定改進措施。該方法在重慶軌道交通環線中得以成功應用。 Abstract: In view of the insufficiency of the research on the analysis method of the failure reason of the hoisting grouting hole, the deduction method of the failure reason of segments are put forward. This method can deduce the possible causes of damage from the failure types, then the failure causes from the whole process of design, production and installation are analyzed, and finally the failure factors and formulates of the improvement measures are obtained. The method is successfully applied to the actual case of Chongqing rail transit loop.
    氯鹽與荷載耦合作用下氯離子在混凝土構件中的擴散性研究
    氯鹽與荷載耦合作用下氯離子在混凝土構件中的擴散性研究
    • 蘇 駿,王 碩,汪思維
    2018年第12期
    摘要
    引用本文
    摘 要:采用三分點自錨法研究氯鹽荷載耦合作用下氯離子的擴散性。試驗以持續彎曲荷載水平大小、荷載水平種類和侵蝕時間為變量,對氯鹽-荷載作用下混凝土構件中氯離子的傳輸機理進行了研究分析。結果表明,在拉應力作用下,結構的致密性被破壞,有利于氯離子的擴散,氯離子含量有所提高。在適當的壓應力作用下,微裂縫生成受阻,抑制了氯離子的擴散,氯離子含量有所減小。 Abstract: The three - point self - anchoring method is used to study the diffusion of chloride ion under coupling effect of chloride salt and loading. Based on the constant bending load level, the load level type and the erosion time as the variables, the mechanism of chloride ion transport under chloride salt is studied and analyzed. Under the action of tensile stress, the compactness of the structure is destroyed, which is beneficial to the diffusion of chloride ions, and the chloride ion content is improved. Under the action of appropriate compressive stress, the formation of microcracks is blocked, the diffusion of chloride ions is inhibited, and the chloride ion content is reduced.
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