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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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    第三期

    擠出型3D打印混凝土力學性能研究進展
    擠出型3D打印混凝土力學性能研究進展
    • 黎寶山,姚一鳴,魯 聰
    2021年第3期
    摘要
    引用本文
    摘 ? 要:介紹了3D打印混凝土的特點與前景,綜述了擠出型工藝的3D打印混凝土的壓、拉、折、剪基本力學性能以及增強措施。研究表明:打印層在噴嘴的擠壓作用下密實度有所提高,但同時層間易形成薄弱界面,造成性能的各向異性,通過調整膠凝材料、摻入纖維、優化工藝、水浴養護、布筋等措施能有效改善。此外,提出了還需進一步研究的問題。 Abstract: The characteristics and developing trend of 3D printed concrete technique are introduced. The mechanical properties including compression, tension, bending, shear and reinforcement measures of the 3D printed concrete are reviewed. The researches show the compactness of 3D printing layer is improved under the extrusion effect of nozzle, but there are obvious weak interface between the layers, leading to a great anisotropy. However, it can be effectively improved by adjusting the material composition, optimizing the processing manner, adopting special cured methods and steel reinforcement. In addition, the problems required for further research are put forword.
    黎寶山,姚一鳴,魯聰.擠出型3D打印混凝土力學性能研究進展[J].混凝土與水泥制品,2021(3):1-6. LI B?S, YAO Y?M, LU C.Research Progress of Mechanical Properties for Extrusion-based 3D?Printed Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(3):1-6.
    g-C3N4光催化混凝土對NO降解性能研究
    g-C3N4光催化混凝土對NO降解性能研究
    • 張瑜都1,孔文瓊1,趙建昌2,張 晴3
    2020年第3期
    摘要
    引用本文
    摘 ? 要:研究了不同制備工藝及摻量的石墨相氮化碳(g-C3N4)對混凝土的力學性能及對NO氣體光催化降解性能的影響及變化規律。通過TEM、SEM、XRD分別對材料的物相及微觀結構進行了表征,利用微機控制全自動壓力試驗機和氮氧化物分析儀分別研究了摻g-C3N4后混凝土的抗壓強度及對NO的降解性能。結果表明,四種不同種類的g-C3N4摻入后混凝土都具有對NO的降解作用,其中,少層g-C3N4的降解率最高,且在紫外線等照射24 h后其仍能保持較高的降解率;g-C3N4摻量不超過0.8%時混凝土的抗壓強度不會有太大影響,在此范圍內盡可能提高g-C3N4的摻量來提高其對NO的降解作用。 Abstract: The effects of different preparation technology and amount of graphite phase carbon nitride (g-C3N4) on the mechanical properties of the concrete and photocatalytic degradation of NO gas were studied. The phase and microstructure of the materials were characterized by TEM, SEM and XRD. The compressive strength and NO degradation of the concrete with g-C3N4 were studied by means of a microcomputer controlled automatic pressure tester and a nitrogen oxide analyzer. The results show that four kinds of g-C3N4 added in concrete have obvious degradation effect on NO, among which the degradation rate of a few layers g-C3N4 is the highest, and it can still maintain a high degradation rate 24 h after UV irradiation. The compressive strength of concrete will not be greatly affected when the amount of g-C3N4 does not exceed 0.8%, and the adding g-C3N4 can be improved as much as possible in this range to improve the degradation of NO. ?
    張瑜都,孔文瓊,趙建昌,等.7 g-C3N4光催化混凝土對NO降解性能研究[J].混凝土與水泥制品,2021(3):7-10. ZHANG Y?D,KONG W?Q,ZHAO J?C,et al.Photocatalytic Concrete Loaded with g-C3N4 and Its Degradation?Performance of NO[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(3):7-10.
    TBM壓注式超高性能混凝土試驗研究
    TBM壓注式超高性能混凝土試驗研究
    • 高玉軍1,2,3,李亞隆4,毛錦波4,王文榮1,2,3
    2021年第3期
    摘要
    引用本文
    摘 ? 要:針對天山勝利隧道TBM壓注式超高性能混凝土(UHPC)的性能要求,基于緊密堆積理論,優化了混凝土中膠凝材料各組分的比例。通過摻入鋼渣粉、納米早強劑和塑性膨脹劑配制出了大流動度、超長保坍、超早強、低收縮的UHPC,并研究了膠凝材料體系緊密堆積孔隙率、鋼纖維摻量、混凝土流動性三者之間的關系。結果表明:采用復合摻合料、鋼渣粉優化膠凝體系、骨料體系可制備出工作性良好、各項性能指標均能滿足要求的UHPC,初始流動度大于700 mm,4 h流動度經時損失小于5%,1 d拆模且抗壓強度大于設計要求51.6 MPa,28 d干燥收縮僅為200×10-6。納米早強劑的摻入不但保證了混凝土早期強度的增長,而且不影響混凝土流動性的長時間保持和后期強度的增長。 Abstract: According to the performance requirements of TBM pressure-pumping ultra high-performance concrete (UHPC) in Tianshan Shengli Tunnel, based on the compact packing theory, the proportion of each component of the cementitious material system in the concrete was optimized. The plastic expansion agent UHPC with high fluidity, ultra-long time slump retention, ultra-early strength and low shrinkage was prepared by adding steel slag powder, nano early strength agent. The relationship between the tightly packed porosity of the cementitious material system and the steel fiber content and concrete fluidity was researched. The results show that the use of compound admixtures, steel slag powder, aggregate system to optimize the cementing system materials can prepare UHPC with excellent working performance and all performance indexes can meet the requirements. The initial fluidity is greater than 700 mm and the 4 h fluidity loss is less than 5%, 1 d demolding and compressive strength is greater than the design requirements of 51.6 MPa, 28 d drying shrinkage is only 200×10-6. The incorporation of nano early strength agent not only guarantees the increase of the concrete’s ultra-early strength, but also has no effect on the concrete’s long-term retention of fluidity and the growth of its strength in the later period.
    高玉軍,李亞隆,毛錦波,等.TBM壓注式超高性能混凝土試驗研究[J].混凝土與水泥制品,2021(3):11-14,19. GAO Y?J,LI Ya-long,MAO Jin-bo,et al.Experimental Research on TBM Pressure-pumping Ultra-high Performance?Concrete (UHPC)[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(3):11-14,19.
    基于損傷理論的硅藻土混凝土凍融損傷研究
    基于損傷理論的硅藻土混凝土凍融損傷研究
    • 王藝程,鄭一峰,秦 泳,于 澤
    2021年第3期
    摘要
    引用本文
    摘 ? 要:通過快速凍融試驗,對不同強度等級的摻硅藻土混凝土的抗凍性進行了分析。在損傷理論的基礎上構建了多次凍融后混凝土劣化失效的數學模型,使用Matlab程序模擬了混凝土內部各單元點的損傷失效與時間的函數關系,并生成了混凝土的截面損傷概率圖。在凍融循環時間相同的條件下對不同硅藻土摻量的混凝土進行了對比分析。結果表明:硅藻土的加入使混凝土的抗凍性能得到了提高;模型模擬的混凝土損傷過程符合凍融破壞的變化規律。 Abstract: Through the rapid freeze-thaw experiment, the frost resistance of diatomite mixed with concrete of different strength levels was systematically analyzed. Based on the damage theory, a mathematical model of concrete degradation and failure after multiple freeze-thaw cycles was constructed. The Matlab program was used to simulate the functional relationship between the damage failure and time of each unit point in the concrete material, and a cross-sectional damage probability map of concrete was generated. Under the condition of the same freeze-thaw cycle time, the concrete with different diatomite content was compared. The results show that the frost resistance of concrete is improved by adding diatomite. And using the damage model for performance analysis, the concrete damage process simulated by the model conforms to the change law of freeze-thaw damage.
    王藝程,鄭一峰,秦泳,等.基于損傷理論的硅藻土混凝土凍融損傷研究[J].混凝土與水泥制品,2021(3):15-19. WANG Y C,ZHENG Y F,QIN Y,et al.Study on Freeze-thaw Damage of Diatomite Concrete Based on the Damage Theory[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(3):15-19.
    水下隧道工程清水混凝土外觀砂斑的成因分析
    水下隧道工程清水混凝土外觀砂斑的成因分析
    • 姜 騫,于 誠
    2021年第3期
    摘要
    引用本文
    摘 ? 要:為了研究清水混凝土外觀砂斑的形成原因,對某水下隧道工程敞開段側墻清水混凝土進行了質量調研與試驗分析。結果表明:砂斑主要與混凝土用水量增加有關;原材料中粉煤灰品質的波動增加了混凝土用水量;為了在相同減水劑摻量下滿足混凝土拌合物的流動性要求,大幅增加用水量造成混凝土中自由水過多,析出帶走混凝土表面的膠凝材料顆粒,由此導致砂斑缺陷;針對缺陷的成因,從原材料品質控制、拌合生產、澆筑施工和及時養護等角度,提出了提升清水混凝土外觀質量的建議。 Abstract: Aiming at a better understanding of cause of sand spots formation on fair-faced concrete for side wall in open section of some underwater tunnel, concrete construction quality on-site and experimental research within-laboratory were conducted. The results show that the concrete defect is found to be related to overuse of mixing water. To fulfill the workability of fresh concrete with same dosage of water reducer, water demand of concrete mixtures is increased for quality variation of fly ash. The excessive quantities of mixing water in the system lead to too much free water in paste. Binder particles on the surface of concrete are flushed away, and the sand spots appear. In addition, considering the cause of the defect, concrete surface quality promotion advices, including control of raw materials quality, pouring construction, and immediately curing, are put forward.
    姜騫,于誠.水下隧道工程清水混凝土外觀砂斑的成因分析[J].混凝土與水泥制品,2021(3):20-23,27. JIANG Q,YU C.Causes Analysis for Sand Spots on Fair-faced Concrete for Side Wall in Underwater Tunnel[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(3):20-23,27.
    寒區隧道混凝土襯砌結構耐久性研究綜述
    寒區隧道混凝土襯砌結構耐久性研究綜述
    • 韓少淵
    2021年第3期
    摘要
    引用本文
    韓少淵.寒區隧道混凝土襯砌結構耐久性研究綜述[J].混凝土與水泥制品,2021(3):24-27. HAN S Y.Review on Durability of Tunnel Concrete Lining Structure in Cold Region[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(3):24-27.
    粉煤灰、礦粉對水泥漿體變形性能的影響
    粉煤灰、礦粉對水泥漿體變形性能的影響
    • 陳紅星1,戴惠蘭1,賈志強1,張守治2,劉建新2,徐 文3
    2021年第3期
    摘要
    引用本文
    摘 ? 要:以高性能混凝土用膠凝材料為研究對象,研究了粉煤灰、礦粉在不同養護濕度和溫度下對水泥漿體變形性能的影響規律。結果表明:飽水養護時,粉煤灰的摻入降低了水泥漿體的水養膨脹變形;養護溫度升高、粉煤灰摻量增加,水泥漿體水養膨脹變形降低幅度增大,但不同水養溫度下摻入礦粉對水泥漿體膨脹變形無明顯影響;密封養護時,摻入粉煤灰可有效抑制水泥漿體的自收縮,但礦粉摻入會增大水泥漿體自收縮;干燥養護時,摻入粉煤灰對水泥漿體有一定的減縮作用,而礦粉的摻入會增大水泥漿體的干燥收縮。 Abstract: Taking the cement material for high performance concrete as the research object,the deformation of cement based materials containing fly ash and slag under different curing humidity and curing temperature was studied. Experimental results show that fly ash reduces expansion deformation of cement paste under saturated condition. When the curing temperature increases, the expansion deformation of the cement paste containing fly ash decreases. However, slag has no effect on the expansion deformation of cement paste whatever under different temperature. Fly ash can reduce the shrinkage of cement paste whatever under sealed condition or under dried condition, but the slag increases the self-shrinkage and drying shrinkage of the cement paste.
    陳紅星,戴惠蘭,賈志強,等.粉煤灰、礦粉對水泥漿體變形性能的影響[J].混凝土與水泥制品,2021(3):28-31. CHEN H X,DAI H L,JIA Z Q,et al.Influence of Fly Ash and Slag on the Deformation Performance of Cement Paste[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(3):28-31.
    預制裝配式綜合管廊模擬分析及結構優化設計
    預制裝配式綜合管廊模擬分析及結構優化設計
    • 馬 騰1,2,張兆強1,孟貴林3
    2021年第3期
    摘要
    引用本文
    摘 ? 要:以綿陽市預制裝配式綜合管廊為研究對象,利用有限元軟件,建立了三維實體模型,考慮了不同分片形式、連接方式、實際受荷情況,分析了其正常使用情況下的彎矩分布變化,并從艙室尺寸排布、增設腋角及改變頂板結構形式三個方面進行了優化設計。研究結果表明:該預制裝配式綜合管廊設計滿足規范要求,但其結構存在進一步優化的空間;當三艙室等間距排布時結構受力相對更合理;增設腋角可明顯改善端部應力集中現象;采用疊合式頂板可有效降低結構最大彎矩值。 Abstract: Taking the precast concrete utility tunnel in Mianyang as the research object, the finite element software ABAQUS was used to establish a three-dimensional solid model, and the form of the segment, the connection method, the actual load were condidered. The stress and the strain were analyzed, and optimized design was carried out from three aspects: cabin size arrangement, adding axillary legs and changing the roof structure. The research results show that the design of the precast concrete utility tunnel can meet the requirements of the specification, but need to be further optimized. When the three compartments are arranged at equal intervals, the structural stress is relatively more reasonable. The addition of axillary legs can significantly improve the stress concentration at the ends. Using a laminated roof can effectively increase the resistance of the roofs.
    馬騰,張兆強,孟貴林.預制裝配式綜合管廊模擬分析及結構優化設計[J].混凝土與水泥制品,2021(3):32-35,39. ZHANG Z Q,MENG G LMA T.Numerical Simulation Analysis and Structural Optimization of Precast Utility Tunnel[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(3):32-35,39.
    復合式防腐路緣石的制備與失效機制模擬研究
    復合式防腐路緣石的制備與失效機制模擬研究
    • 崔東霞1,付元坤2,惠 冰3,王 超1
    2021年第3期
    摘要
    引用本文
    摘 ? 要:制備了一種復合式防腐路緣石,其內部為C40混凝土,外包裹層分別為環氧砂漿與自乳化砂漿,并建立了相應復合結構的數值模擬模型,研究了外包裹層對復合式路緣石強度和耐久性的影響,并模擬了內外層結構線膨脹系數對體系應力的影響。結果表明:與環氧砂漿相比,自乳化砂漿的抗壓、抗折強度值較低,且在經受鹽凍破壞后,其抗壓、抗折強度下降幅度較大;環氧砂漿復合式路緣石在降溫荷載作用下,除約束處外,路緣石截面突變處達到最大拉應力9.41 MPa,易開裂;自乳化砂漿復合式路緣石在降溫荷載作用下的拉應力為2.99 MPa,未開裂;基于研究結果,提出了復合式路緣石結構尺寸的優化設計方案。 Abstract: Anti-corrosive composite curbs were prepared by using C40 concrete as interior structure, epoxy mortar and waterborne epoxy mortar as exterior coating individually, the finite element models were established to study the effects of the exterior coating on the strength and durability of the curbs. The results show that compared with with epoxy resin mortar, the compressive and flexural strength of self-emulsified mortar are lower, and the compressive and flexural strength decrease greatly after salt freezing. Under the cooling loads, the maximum tensile stress of epoxy mortar line composite curbs is 9.41 MPa at the abrupt change of curbs section, except for the constraint, which is easy to crack. The tensile stress of self emulsifying mortar line composite curbs under the cooling load is 2.99 MPa, which is not cracked. Based on the research results, the optimization suggestions for the structure of composite curbs are put forward.
    崔東霞,付元坤,惠冰,等.復合式防腐路緣石的制備與失效機制模擬研究[J].混凝土與水泥制品,2021(3):36-39. CUI D X,FU Y K,HUI B,et al.Preparation and Failure Mechanism Simulation of Composite Anti-corrosion Curbs[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(3):36-39.
    預制樁用套珠式連接器的研究與應用
    預制樁用套珠式連接器的研究與應用
    • 鄧劍濤1,袁 濤2,鄧成河1
    2021年第3期
    摘要
    引用本文
    摘 ? 要:為提高預應力混凝土管樁的連接質量和施工速度,研制了一種新型預應力混凝土管樁用套珠式連接器,闡述了其結構原理,并通過力學試驗,驗證了其力學性能滿足相關標準要求。此外,結合工程應用,介紹了該連接器的安裝和施工工序,具有安全可靠、連接快捷等優點。 Abstract: In order to improve the connection quality and construction speed of precast concrete piles, a new type of beaded connector for the concrete piles was developed, and the structure principle was described. The mechanical test results show that its mechanical properties can meet the requirements of relevant standards. In addition, combined with the engineering application, the installation and construction process of the connector are introduced and shows the advantages of safety, reliability and fast connection.
    鄧劍濤,袁濤,鄧成河.預制樁用套珠式連接器的研究與應用[J].混凝土與水泥制品,2021(3):40-42. DENG J T,YUAN T,DENG C H.Research and Application on the Beaded Connector for the Precast Concrete Piles[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(3):40-42.
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