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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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    第九期

    搭接寬度對打印混凝土基本力學性能的影響
    搭接寬度對打印混凝土基本力學性能的影響
    • 武 雷,孫 遠,楊 威
    2019年第9期
    摘要
    引用本文
    摘 要:混凝土層疊打印成型時,其力學性能受工藝的影響較大。為探究打印過程中條帶的搭接寬度對打印混凝土構件的抗壓強度、雙向劈裂抗拉強度的影響,使用極坐標系3D打印機按不同的搭接寬度,打印了多組混凝土立方體試件,并與現澆試件的抗壓及劈裂性能做了對比試驗。結果表明,層疊打印構件的抗壓強度折減明顯,搭接寬度較低時折減可達到一半,隨著搭接寬度的提升,打印試件的抗壓強度呈非線性增長;打印試件順紋橫紋下的截面劈裂抗拉強度均低于現澆試件,順紋折減更加明顯。搭接寬度的增加會提升雙向抗拉強度,對于順紋截面,搭接寬度較低時提升明顯,后趨于穩定,對于橫紋截面,其主要呈現為一種線性變化形式,趨于現澆抗拉強度。 Abstract: When the concrete is printed by layered superimposed, its mechanical properties are greatly affected by the process. In order to explore the influence of the lap width of the strip on the compressive strength and the two-way splitting tensile strength of the printed concrete members, a plurality of sets of concrete cube specimens were printed using a polar coordinate system 3D printer according to different overlapping widths, a comparison test with the cast-in-place test piece for compression and splitting. The results show that the compressive strength of the laminated printing member is obviously reduced. When the overlapping width is low, the reduction can be half. With the increase of the overlapping width, the compressive strength of the printed test piece increases non-linearly. The tensile strength of the section under the transverse stripes is lower than that of the cast-in-place specimens, and the reduction of the grain is more obvious. The increase of the lap width will increase the two-way tensile strength. For the cross section, the lap width is lower and the lift is obvious, and then the stability tends to be stable. For the cross section, it mainly appears as a linear variation, tending to cast in place tensile strength.
    武雷,孫遠,楊威.搭接寬度對打印混凝土基本力學性能的影響[J].混凝土與水泥制品,2019(9):1-5. WU L,SUN Y,YANG W.Experimental Study on Influence of Lap Width on the Basic Mechanical Properties of Printed Concrete[J].China Concrete and Cement Products,2019(9):1-5.
    既有污水混凝土構筑物表層及內部混凝土腐蝕情況研究
    既有污水混凝土構筑物表層及內部混凝土腐蝕情況研究
    • 沈貴陽1,劉遠祥2,樊俊江3
    2019年第9期
    摘要
    引用本文
    摘 要:通過混凝土中性化深度測試并綜合XRD、SEM、EDS、X-CT等微觀測試手段對既有污水混凝土構筑物表層混凝土的腐蝕深度進行定量化表征。對污水混凝土構筑物內部混凝土力學性能、微觀性能、內部鋼筋銹蝕情況、氯離子含量分布進行測試,確認內部混凝土的腐蝕情況。通過污水水質分析推測污水混凝土構筑物腐蝕破壞的可能原因。結果表明,既有污水混凝土構筑物表面往下深度5 mm以內的混凝土受腐蝕較為嚴重,表面往下5~22 mm深度范圍內的混凝土發生輕度的鈣溶蝕,距腐蝕表面深度大于22 mm的內部混凝土未受腐蝕,污水構筑物表層混凝土受腐蝕的主要原因為有機物在微生物作用下形成的酸溶蝕。 Abstract: The corrosion depth of surface concrete of existing sewage concrete structures was quantitatively characterized by means of concrete neutralization depth test and micro-test methods such as XRD, SEM, EDS and X-CT. The mechanical properties, microscopic properties, corrosion state of steel bars and chloride ion content distribution of concrete inside were tested to confirm the inside concrete corrosion. The possible causes of corrosion damage of sewage concrete structures are inferred through the analysis of sewage water quality. The results show that the concrete of existing sewage concrete structures with a depth of less than 5 mm below the surface is corroded seriously. The concrete with a depth of 5~22 mm below the surface undergoes slight calcium corrosion. The concrete with a depth greater than 22 mm away from the corroded surface is not corroded. The main reason for the corrosion of sewage concrete is the acid corrosion caused by organic matter under the action of microorganisms
    沈貴陽,劉遠祥,樊俊江.既有污水混凝土構筑物表層及內部混凝土腐蝕情況研究[J].混凝土與水泥制品,2019(9):6-9. SHEN G Y,LIU Y X,FAN J J.Study on Corrosion of Surface and Internal Concrete of the Existing Sewage Concrete Structures[J].China Concrete and Cement Products,2019(9):6-9.
    基于混料設計的干硬性混凝土強度模型
    基于混料設計的干硬性混凝土強度模型
    • 劉嫄春1,崔恩彤1,汪恩良1,2,孔子潔1
    2019年第9期
    摘要
    引用本文
    摘 要:采用D-最優混料設計方法得出了水泥-硅灰-粉煤灰-礦粉四元復合膠凝材料組成與1 d、7 d和28 d齡期干硬性混凝土抗壓強度關系的回歸模型,并檢驗了模型的有效性;各齡期干硬性混凝土強度等值線變化揭示了復合膠凝材料各組分對混凝土強度的影響;基于強度預測模型以最低水泥用量和最高各齡期混凝土強度為優化目標確定了干硬性混凝土四元復合膠凝混料最優組合配合比,強度預測值與實驗值的相對誤差小于5%。 Abstract: An application of the D-optimal mixture design method in predicting the properties of a quaternary cementitious systemconsists of cement, silica fume, fly ash and ground slag is put forward. Based on D-optimal mixture design and experimental data, the regression models of compressive strength of dry concrete for 1 d, 7 d and 28 d of curing time is obtained, and are statistically tested. The influence of each component on the strength of each age of concrete is revealed by analyzing the variation of strength equivalents of dry concrete. The optimum combination ratio of quaternary composite cementitious mixture for dry concrete is obtained based on the strength prediction model, with the minimum cement dosage and the maximum age concrete strength as the optimization goal. The relative error between the measured value and the experimental value is less than 5%.
    劉嫄春,崔恩彤,汪恩良,等.基于混料設計的干硬性混凝土強度模型[J].混凝土與水泥制品,2019(9):10-14. LIU Y C,CUI E T,WANG E L,et al.Strength Model of Dry Concrete Based on Mixture Design[J].China Concrete and Cement Products,2019(9):10-14.
    含水率對摻硅灰混凝土聲學特性的影響研究
    含水率對摻硅灰混凝土聲學特性的影響研究
    • 劉 琨1 ,嚴武建1,2,牛富航2 ,吳志堅3 ,鄭海忠1
    2019年第9期
    摘要
    引用本文
    摘 要:為了研究含水率對硅灰混凝土的聲波參數和物理力學性質的影響,進行了硅灰混凝土的超聲波測試,同時測試了其在零含水率情況下的抗壓強度。并基于試驗結果分析了含水率對硅灰混凝土波速的影響以及波速與抗壓強度的關系。結果表明,硅灰混凝土超聲波縱波速度隨含水率的增大逐漸增大且至飽和狀態達到峰值,含水率從零增大至2%附近時,橫波波速先增大而后隨含水率的增大急劇減??;硅灰混凝土聲波波速與抗壓強度存在良好的線性相關性,在相同含水率條件下,硅灰混凝土的抗壓強度越大,聲波波速越高。通過對含水率的估算,可以將這一特性應用到無損檢測中,作為評定混凝土強度變化的手段之一。 Abstract: In order to study the influence of water content on the acoustic characteristics and the mechanical properties of silica fume concrete, ultrasonic tests in silica fume concrete were conducted and compressive strengths were measured on the zero water content. Based on the testing results, the effect of water content on the ultrasonic wave velocity of silica fume concrete and the relationship between the wave velocity and the compressive strength was discussed. Ultrasonic P-wave velocity of silica fume concrete increased gradually with the increase of water content and reached the peak when the saturation state, the S-wave velocity increased with the increase of water content from zero water content then decreased sharply with the peak of water content. There existed a good linear correlation between the ultrasonic wave velocity and the compression strength of silica fume concrete. The larger the compression strength,the faster the wave. It can be concluded that by estimating the water content, this characteristic can be applied to NDE as one of the means for assessing the change of concrete strength.
    劉琨,嚴武建,牛富航,等.含水率對摻硅灰混凝土聲學特性的影響研究[J].混凝土與水泥制品,2019(9):15-18. LIU K,YAN W J,NIU F H,et al.Water Content and Its Effect on Acoustic Characteristics of Silica Fume Concrete[J].China Concrete and Cement Products,2019(9):15-18.
    海砂混凝土中鋼筋銹蝕情況研究
    海砂混凝土中鋼筋銹蝕情況研究
    • 宋旭艷,姜正平,韓靜云,郜志海
    2019年第9期
    摘要
    引用本文
    摘 要:對各種海砂混凝土體系下的鋼筋成型鈍化膜,再通電加速腐蝕對鋼筋進行破鈍,并綜合電化學方法和鋼筋失重率對比研究了各體系下的混凝土中鋼筋銹蝕規律。結果表明,淡水拌合淡化海砂混凝土體系中的鋼筋耐銹蝕能力較好;隨著Cl-濃度的提高,鋼筋的腐蝕行為越嚴重,但是存在臨界Cl-濃度。經過淡化處理的海砂使其氯離子含量降低至一定值內,是可以代替河砂使用。若直接用海砂來配制混凝土,則需要使混凝土內部生成或者本身帶有較強的堿性物質,進而才能抑制高氯離子含量的混凝土體系中鋼筋的銹蝕行為。 Abstract: The passivation films of steel bars are formed under various concrete systems, and the steel bars are blunted by electric accelerated corrosion. Corrosion law of steel bars in various concrete systems is compared by electrochemical methods and weight loss rate of steel bars. The results show that, corrosion resistance of steel bars in washed sea sand concrete system with fresh water is better. With the increasing of Cl- concentration, corrosion behavior of steel bar is more serious, but there is a critical Cl- concentration. Sea sand resources can be used instead of river sand by washed treatment to reduce Cl- content to a certain value. In order to prepare concrete with sea sand, it is necessary to make concrete internally generated or have strong alkaline substances to inhibit corrosion behavior of steel bar in concrete system with high Cl- content.
    宋旭艷,姜正平,韓靜云,等.海砂混凝土中鋼筋銹蝕情況研究[J].混凝土與水泥制品,2019(9):19-23. SONG X Y,JIANG Z P,HAN J Y,et al.Study on Corrosion of Steel Bars in Sea Sand Concrete[J].China Concrete and Cement Products,2019(9):19-23.
    寒冷地區海洋環境混凝土抗Cl-滲透及抗凍性能研究
    寒冷地區海洋環境混凝土抗Cl-滲透及抗凍性能研究
    • 陳際洲1,趙鐵軍1,王越虹2,王鵬剛1
    2019年第9期
    摘要
    引用本文
    摘 要:基于北方寒冷地區海洋環境混凝土結構工程的技術要求,利用大摻量礦物摻合料(40%、50%)來改善混凝土內部的微觀結構,提高其密實度,其中,硅灰的摻量為3%。分別制備了不同強度等級的海工混凝土,并研究了其抗Cl-滲透性能、抗凍性指標及微觀結構。結果表明,C45~C60海工混凝土的抗Cl-滲透等級均在RCM-Ⅲ級及以上,性能優良;經300次凍融循環后,各系列海工混凝土的質量損失率最高為3.4%,相對動彈性模量最低為73%,完全滿足了F300的海工混凝土抗凍性能要求。 Abstract: Based on the technical requirements of marine environmental engineering concrete structure in the cold area of the north China, the internal microscopic structure of concrete is improved by adding high content mineral admixtures(40%, 50%) in order to improve its compactness, in which silicon ash content is 3%. Different strength grade of marine engineering concrete is prepared, and the index of Cl- permeability resistance, frost resistance and micro-structure are studied. The results show that the Cl- penetration level of C45,C60 concrete is above RCM-Ⅲ level, so the resistance to Cl- permeability is excellent; the degree of compactness of concrete is the key factor affecting its frost resistance. After 300 freeze-thaw cycles, the quality loss rate of various series of marine concrete is the highest (3.4%), and the relative dynamic elastic modulus is the lowest (73%), which fully meets the frost resistance requirements of Marine concrete F300.
    陳際洲,趙鐵軍,王越虹,等.寒冷地區海洋環境混凝土抗Cl-滲透及抗凍性能研究[J].混凝土與水泥制品,2019(9):24-28. CHEN J Z,ZHAO T J,WANG Y H,et al.Research on Chloride Anti-penetration Performance and Antifreeze Performance of Marine Environment Concrete in Cold Regions[J].China Concrete and Cement Products,2019(9):24-28.
    先張法預應力離心混凝土竹節樁生產試驗研究
    先張法預應力離心混凝土竹節樁生產試驗研究
    • 薛萬銀
    2019年第9期
    摘要
    引用本文
    摘 要:采用常壓蒸汽養護方式,以硅粉為摻合料配制了強度等級為C85的混凝土,研究了硅粉摻量對混凝土布料成型和強度的影響,并結合生產實際情況,參考PHC管樁離心成型和蒸汽養護工藝制度,確定了無余漿生產竹節樁的離心成型及蒸汽養護工藝制度。 Abstract: The pretensioned spun knot piles of C85 concrete with silicon fume was prepared by using atmospheric pressure steam curing method, the influence of silica fume content on the formation and strength of pretensioned spun concrete knot piles was studied. Combined with the actual production situation, the spun forming and steam curing process of PHC pipe, the spun forming and steam curing technology system of pretensioned centrufugal concrete knot piles with free-paste was put forward..
    薛萬銀.先張法預應力離心混凝土竹節樁生產試驗研究[J].混凝土與水泥制品,2019(9):29-31+45. XUE W Y.Experiment Study on Production of Pretensioned Spun Concrete Knot Piles[J].China Concrete and Cement Products,2019(9):29-31+45.
    用廢棄混凝土生產鋼筋混凝土排水管應用技術研究
    用廢棄混凝土生產鋼筋混凝土排水管應用技術研究
    • 吳自強1,滿高鵬2,張 蕊3,謝一飛3
    2019年第9期
    摘要
    引用本文
    摘 要:利用再生技術對廢棄混凝土進行破碎加工和篩選,制成再生混凝土骨料,并用于生產鋼筋混凝土排水管。結果表明,采用30%再生骨料替代天然碎石骨料時,生產的鋼筋混凝土排水管力學性能可滿足相關標準要求。 關鍵詞:廢棄混凝土;再生骨料;級配;鋼筋混凝土排水管;力學性能 Abstract: The feasibility of the reuse of the waste concrete recycled aggregate from concrete products company was investigated and the results shows that the compressive strength of the concrete decreased as the increase of the dosage of recycled aggregate. The main performance indicators of the steel concrete sewer pipe can meet the standard requirements when it was produced using recycled aggregate replaces 30% natural aggregate.
    吳自強,滿高鵬,張蕊,等.用廢棄混凝土生產鋼筋混凝土排水管應用技術研究[J].混凝土與水泥制品,2019(9):32-34. WU Z Q,MAN G P,ZHANG R,et al.Research on the Application Technology of Reinforced Concrete Drainage Pipe Produced from Waste Concrete[J].China Concrete and Cement Products,2019(9):32-34.
    中空疊合墻板預制工藝及自支撐結構穩定性分析
    中空疊合墻板預制工藝及自支撐結構穩定性分析
    • 王振強,魏奇科,陳 豪,廖小輝
    2019年第9期
    摘要
    引用本文
    摘 要:結合裝配整體式地下綜合管廊實際工程應用,總結了中空疊合墻板的預制工藝及制作要點,并通過數值模擬及現場實際工程的吊裝施工驗證了中空疊合墻板自支撐體系的穩定性與可靠性,結果可為裝配整體式綜合管廊的生產和施工提供參考。 Abstract: Based on the actual engineering of assembled monolithic integrated underground utility tunnel, the precast technology of hollow composite wallboard and making the point were summarized. The stability and reliability of the self-supporting system of the hollow laminated wallboard were verified by numerical simulation and the hoisting construction of the actual project, which could provide a reference for the application of the assembled integral utility tunnel.
    王振強,魏奇科,陳豪,等.中空疊合墻板預制工藝及自支撐結構穩定性分析[J].混凝土與水泥制品,2019(9):35-39. WANG Z Q,WEI Q K,CHEN H,et al.Prefabricated Hollow Laminated Wallboard and Stability Analysis of Its Self-supporting Structure[J].China Concrete and Cement Products,2019(9):35-39.
    裝配式淺圓倉倉頂結構建造技術與經濟性分析
    裝配式淺圓倉倉頂結構建造技術與經濟性分析
    • 龐 瑞1,畢來賓1,陳桂香1,郭呈周1,2,黃 彬2
    2019年第9期
    摘要
    引用本文
    摘 要:以某產業園項目為背景,提出了裝配式混凝土倉頂結構的建造方案?;贐IM平臺建立倉頂結構預制構件庫,對項目進行了施工全過程管理模擬,基于廣聯達工程預算計價平臺,采用定額組價方法對兩種建造方式的倉頂結構直接成本進行了對比分析。研究表明,裝配式倉頂結構與傳統式倉頂結構相比可大幅度降低成本、縮短工期、減少資源浪費、降低風險,具有較好的技術經濟優勢和推廣價值。 Abstract: A construction scheme of the roof structure is proposed for the project of a industrial park. BIM software was used to build a roof structure prefabricated component library, simulation construction process management of the project was carried out. The direct costs of the roof structure of two construction methods were contrasted and analyzed by using the method of fixed set of price. The research shows that the assembled warehouse roof structure can greatly reduce the cost, shorten the construction period, reduce the waste of resources and reduce the risk compared with the traditional warehouse roof structure, and has better technical and economic advantages and better popularization value.
    龐瑞,畢來賓,陳桂香,等.裝配式淺圓倉倉頂結構建造技術與經濟性分析[J].混凝土與水泥制品,2019(9):40-45. PANG R,BI L B,CHEN G X,et al.Construction Technology and Economic Analysis of Prefabricate Roof Structure of Squait Silo[J].China Concrete and Cement Products,2019(9):40-45.
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