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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

    3D打印混凝土力學性能試驗方法
    3D打印混凝土力學性能試驗方法
    • 侯澤宇,張 宇,張 超,陳逸東,陳 春,張亞梅,張云升
    2019年第11期
    摘要
    引用本文
    摘 要:總結了國內外3D打印混凝土力學性能的試驗方法,介紹和比較了3D打印混凝土抗壓強度、抗折強度、層間結合強度、劈拉強度、抗拉強度和彈性模量試驗方法,提出了為規范3D打印混凝土的力學性能制定3D打印混凝土力學性能試驗方法相關標準的必要性。 3D printing concrete technology is a research hotspot in the field of building materials. The test methods of mechanical properties of 3D printing concrete in the world are summarized. The test methods for the compressive strength, flexural strength, interlayer bonding strength, splitting tensile strength, tensile strength and elastic modulus of 3D printing concrete are described in detail. It is necessary to develop a standard test method for mechanical properties of 3D printing concrete.
    侯澤宇,張宇,張超,等.3D打印混凝土力學性能試驗方法[J].混凝土與水泥制品,2019(11):1-5. HOU Z Y,ZHANG Y,ZHANG C,et al.Test Method for Mechanical Properties of 3D Printing Concrete[J].China Concrete and Cement Products,2019(11):1-5.
    含粗骨料超高性能混凝土的制備及其性能研究
    含粗骨料超高性能混凝土的制備及其性能研究
    • 李 信1,2,陳露一1,2,黃有強1,2,張志豪1,2,譚洪波3
    2019年第11期
    摘要
    引用本文
    摘 要:針對超高性能混凝土(UHPC)膠凝材料用量大、非綠色化、成本高、自收縮大等問題,通過引入5~10 mm粒徑的粗骨料,采用普通河砂代替石英砂,并優化鋼纖維體積摻量,成功制備出了經濟環境效益良好、性能優良的含粗骨料超高性能混凝土(UHPC-CA)。研究了粗骨料摻量對UHPC-CA工作性和力學性能的影響,并與UHPC性能進行了對比分析。結果表明,UHPC-CA的流動性能相比UHPC有所降低,粗骨料摻量為675 kg/m3的UHPC-CA能保持良好流動性能,但隨著粗骨料摻量的增加,流動性降低的十分明顯;UHPC-CA抗壓強度、抗折強度低于UHPC,彈性模量則高于UHPC,不同粗骨料摻量UHPC-CA力學性能變化并不明顯;UHPC-CA抗氯離子滲透性能和抗凍性能表現良好,但是不如UHPC優異;摻入粗骨料能夠改善UHPC-CA的自收縮性能,相比UHPC,其早期自收縮率明顯降低。 Abstract: Regarding to the problem that the ultra high performance concrete(UHPC) needs a large amount of cementing material, non-greening, high cost and has a high self-shrinkage, the ultra high performance concrete with coarse aggregate(UHPC-CA) with good economical and environmental performance and excellent performance was successfully prepared with coarse aggregate of 5~10 mm particle size, ordinary river sand and optimized amount of steel fiber. The effect of coarse aggregate content on the working performance and mechanical properties of UHPC-CA was studied, and all the performance of UHPC-CA while compared with UHPC were analyzed. The results show that the flow performance of UHPC-CA is lower than that of UHPC and with the increase of coarse aggregate content from 675 kg/m3 to 825 kg/m3, the fluidity is obviously reduced. The compressive strength and anti-folding strength of UHPC-CA are lower than UHPC, however, the elastic modulus is higher than that of UHPC. The change of the mechanical properties of UHPC-CA with different coarse aggregates content is not obvious. UHPC-CA has good performance against chloride ion permeation and good antifreeze performance, but both not as good as that of UHPC. The coarse aggregate can improve the self-shrinkage performance of UHPC-CA and its early self-shrinkage rate is significantly lower than that of UHPC. Key words: Utra high performance concrete; Coarse aggregate; Mechanical property; Working performance
    李信,陳露一,黃有強,等.含粗骨料超高性能混凝土的制備及其性能研究[J].混凝土與水泥制品,2019(11):6-8. LI X,CHEN L Y,HUANG Y Q,et al.Study on the Preparation and Properties of Ultra High Performance Concrete with Coarse Aggregate[J].China Concrete and Cement Products,2019(11):6-8.
    陽離子型混凝土阻銹劑防腐蝕性能研究
    陽離子型混凝土阻銹劑防腐蝕性能研究
    • 陳逸群1,3,左俊卿2,3,房霆宸2,朱敏濤1,3,吳德龍1,3
    2019年第11期
    摘要
    引用本文
    摘 要:利用電化學測試技術研究了乙醇胺(ETA)、四正丁基溴化胺(TBA)和氯化十六烷基吡啶(CPC)三種陽離子型阻銹劑在不同NaCl濃度的混凝土模擬孔溶液中對鋼筋的防腐蝕性能的影響。研究結果表明:在低濃度的NaCl模擬體系中,阻銹劑對鋼筋的腐蝕防護效果較好;結合動電位極化測試和交流阻抗譜測試結果得出,CPC阻銹劑屬于混合型阻銹劑,通過在鋼筋表面吸附成膜抑制腐蝕過程,CPC對鋼筋的防腐蝕效果更佳。 Abstract: In the present work, the performance of several cationic corrosion inhibitors were studied by the electrochemical techniques in simulated corrosion solution containing different concentrations of NaCl. Results show that the inhibitors demonstrate obvious efficiency in the low concentration NaCl solution. Combined with potentiodynamic polarization test and electrochemical impedance spectroscopy, the chlorine pyridine (CPC) show good performance in corrosion protection. CPC is a mixed type inhibitor, which can restrain corrosion process by the quick adsorption of active component on steel surface.
    陳逸群,左俊卿,房霆宸,等.陽離子型混凝土阻銹劑防腐蝕性能研究[J].混凝土與水泥制品,2019(11):9-11+16. CHEN Y Q,ZUO J Q,FANG T C,et al.Study on Corrosion Resistance of Cationic Concrete Rust Inhibitor[J].China Concrete and Cement Products,2019(11):9-11+16.
    鹽堿-干濕條件下混凝土強度及耐久性問題研究
    鹽堿-干濕條件下混凝土強度及耐久性問題研究
    • 鄧 鵬
    2019年第11期
    摘要
    引用本文
    摘?要:分析了納米CaCO3摻入量、鹽堿濃度等因素對混凝土在鹽堿-干濕循環后的強度及耐久性的影響,通過150次的干濕循環,研究了混凝土抗壓強度耐蝕系數、質量損失率、相對動彈性模量等耐久性指標隨干濕循環的變化規律。試驗結果表明,摻入1%的納米CaCO3可以使28d混凝土試件獲得較高的抗壓強度,鹽堿-干濕循環條件下2%摻量的納米CaCO3混凝土試件強度下降最低。納米CaCO3對混凝土干濕循環中后期的耐久性有明顯的提高作用,其最佳摻量為2%,摻量超過2%后則會造成耐久性指標的下降。鹽堿濃度對納米混凝土耐久性的影響隨干濕循環次數的增加而增大,且相對動彈模量較質量損失率指標更易受鹽堿濃度的影響。Abstract:Thestrengthanddurabilityofconcreteaftersaline-alkali-dry-wetcyclewereanalyzedaroundthefactorssuchasnano-CaCO3contentandsaline-alkaliconcentration.Throughthemaximum150cyclesofdry-wetcycle,thechangingrulesofdurabilityindexessuchascompressivestrength,corrosionresistancecoefficient,masslossrateandrelativedynamicelasticmodulusofconcretewithdry-wetcyclewerestudied.Theexperimentalresultsshowthat1%nano-CaCO3canincreasethecompressivestrengthof28dconcretespecimens,and2%nano-CaCO3canreducethestrengthdecreaseofconcretespecimensatthelowestlevelundersaline-alkali-dry-wetcyclingconditions.Thedurabilityofconcretecouldbeimprovedbynano-CaCO3inthemiddleandlatestageofdry-wetcycle,andtheoptimumcontentofnano-CaCO3is2%.Asthecontentofnano-CaCO3exceeds2%,thedurabilityindexwilldecrease.Theinfluenceofsaline-alkaliconcentrationonthedurabilityofnano-concreteincreaseswiththegrowthofwet-drycyclesandtherelativedynamicmodulusofelasticityismoresensitivetotheinfluenceofsaline-alkaliconcentrationthanthemasslossrateindex.
    鄧鵬.鹽堿-干濕條件下混凝土強度及耐久性問題研究[J].混凝土與水泥制品,2019(11):12-16. DENG P.Study on Strength and Durability of Concrete under Saline-alkali-dry-wet Conditions[J].China Concrete and Cement Products,2019(11):12-16.
    改性Ⅲ級粉煤灰對混凝土強度和自收縮的影響
    改性Ⅲ級粉煤灰對混凝土強度和自收縮的影響
    • 陳 登1,2,張鈺暉2,高世明2,宋旭艷2
    2019年第11期
    摘要
    引用本文
    摘 要:采用電石渣對Ⅲ級粉煤灰進行增鈣煅燒改性,利用XRD對改性Ⅲ級粉煤灰的礦物組成進行分析,測定了摻入改性Ⅲ級粉煤灰的C30混凝土的抗壓強度和自收縮,并采用BSEM和納米壓痕儀分析了改性Ⅲ級粉煤灰與水泥漿體的微界面結構及微界面力學性能。結果表明:Ⅲ級粉煤灰經增鈣煅燒改性后生成了水硬性礦物β-C2S,水化可生成C-S-H凝膠,改善了Ⅲ級粉煤灰顆粒與水泥漿體的微界面區結構,提高了微界面區的彈性模量和硬度,從而提高了摻Ⅲ級粉煤灰混凝土的強度,并降低了其自收縮。 Abstract: The grade Ⅲ fly ash was modified through calcination method by mixing carbide slag, the mineral compositions of the modified grade Ⅲ fly ash were characterized by XRD. The effects of modified grade Ⅲ fly ash on compressive strength and autogenous shrinkage of C30 concrete were investigated. The microstructure and mechanical properties of micro-interface between modified grade Ⅲ fly ash and cement paste were analyzed by using backscattered electron microscopy (BSEM) and nanoindentation technique. The results show that the β-C2S phases are formed after the grade Ⅲ fly ash was modified. Due to the hydration of the β-C2S, C-S-H gel is generated, the microstructure of micro-interface between grade Ⅲ fly ash and cement paste is densified, the nanoindentation modulus and hardness of micro-interface are improved. Therefore, the compressive strengths of concrete containing grade Ⅲ fly ash are increased, and the autogenous shrinkages of concrete are decreased.
    陳登,張鈺暉,高世明,等.改性Ⅲ級粉煤灰對混凝土強度和自收縮的影響[J].混凝土與水泥制品,2019(11):17-20. CHEN D,ZHANG Y H,GAO S M,et al.Influence of Modified Grade Ⅲ Fly Ash on Strength and Autogenous Shrinkage of Concrete[J].China Concrete and Cement Products,2019(11):17-20.
    機制砂質量指標及對混凝土性能的影響分析
    機制砂質量指標及對混凝土性能的影響分析
    • 董 超,馮 晨,楊進波,馮竟竟,洪汝楠
    2019年第11期
    摘要
    引用本文
    摘 要:機制砂作為天然砂替代品,在顆粒形貌、石粉含量等質量指標上均不同于天然砂,因此,導致混凝土性能存在差異。本文在分析國內外標準規范的基礎上,研究了不同規范中機制砂的定義及質量指標,敘述了機制砂質量指標對混凝土性能的影響,進而為機制砂的工程應用提出建議。 As a substitute for natural sand, manufactured sand is different from natural sand in quality indexes such as particle morphology and stone powder content, which will lead to differences in concrete performance. Based on the analysis of standards and specifications at home and abroad, the definition and quality index of manufactured sand in different specifications are studied. The influence of quality index of manufactured sand on performance of concrete is summarized, and some suggestion for engineering applications of manufactured sand are put forward.
    陳登,張鈺暉,高世明,等.改性Ⅲ級粉煤灰對混凝土強度和自收縮的影響[J].混凝土與水泥制品,2019(11):17-20. CHEN D,ZHANG Y H,GAO S M,et al.Influence of Modified Grade Ⅲ Fly Ash on Strength and Autogenous Shrinkage of Concrete[J].China Concrete and Cement Products,2019(11):17-20.
    礦物摻合料對混凝土內部堿度影響研究
    礦物摻合料對混凝土內部堿度影響研究
    • 姜正平1,宋旭艷1,明 維2
    2019年第11期
    摘要
    引用本文
    摘 要:通過摻加粉煤灰、礦粉、磨細石英砂等礦物摻合料制備了不同強度等級的混凝土,研究了礦物摻合料摻量、種類以及水灰比、混凝土內部不同深度對混凝土內部堿度的影響,并對比分析了不同礦物摻合料混凝土的抗硫酸鹽侵蝕性能。研究結果表明,適量的礦物摻合料不僅可節約水泥,優化混凝土結構,提高混凝土抗硫酸鹽侵蝕能力,同時對混凝土內部堿度影響較小?;炷羶炔繅A度分布基本均勻,不同深度的孔溶液中pH值基本一致;且混凝土的水灰比對其堿度幾乎沒有影響。 Abstract: The concrete with different strength grades was prepared by adding mineral admixtures such as fly ash, slag and ground quartz sand. The effects of mineral admixture content and type, W/C and different depth of concrete on the internal alkalinity of concrete were studied. The sulfate corrosion resistance of concrete with different mineral admixtures was compared. The results show that appropriate mineral admixtures can not only save cement, optimize concrete structure and improve the sulfate resistance of concrete, but also have little influence on the internal alkalinity of concrete. The alkalinity distribution in concrete is basically uniform, and the pH value in pore solution of different depths is basically the same, and the water cement ratio in concrete has little effect on its alkalinity.
    董超,馮晨,楊進波,等.機制砂質量指標及對混凝土性能的影響分析[J].混凝土與水泥制品,2019(11):21-24. DONG C,FENG C,YANG J B,et al.Analysis of the Quality Index of Manufactured Sand and Its Influence on Concrete Performance[J].China Concrete and Cement Products,2019(11):21-24.
    國內預應力鋼筒混凝土管發展面臨問題的幾點思考與對策
    國內預應力鋼筒混凝土管發展面臨問題的幾點思考與對策
    • 余洪方,鈕如嵩
    2019年第11期
    摘要
    引用本文
    摘 要:基于目前國內預應力鋼筒混凝土管(PCCP)發展面臨的幾大問題,結合具體工程,從產品結構設計、主要原材料采購、生產質量控制、鋪設使用場合和運行管理等方面提出了相應建議,以利于促進PCCP行業健康有序發展。 Abstract: Based on several major problems faced by the development of PCCP in China, and combined with specific projects, the corresponding suggestions are put forward from the aspects of product structure design, purchase of main raw materials, quality control of production, laying and using occasions and operation management to promote the healthy and orderly development of PCCP industry.
    姜正平,宋旭艷,明維.礦物摻合料對混凝土內部堿度影響研究[J].混凝土與水泥制品,2019(11):25-29. JIANG Z P,SONG X Y,MING W.Effect of Mineral Admixture on the Internal Alkalinity of Concrete[J].China Concrete and Cement Products,2019(11):25-29.
    高溫飽和蒸汽環境下管樁混凝土的堿骨料反應研究
    高溫飽和蒸汽環境下管樁混凝土的堿骨料反應研究
    • 明廷洪1,余曉文1,滕耀華1,朱躍華2,楊潤忠2
    2019年第11期
    摘要
    引用本文
    摘 要:從堿骨料反應的定義、分類、條件、機理、預防措施等方面介紹了堿骨料反應的原理。利用白云巖制作了兩組膠砂試件,一組試件膠材采用純水泥,另一組摻入10%的硅灰等量替代水泥,并在水泥標準養護箱中養護24 h,脫模后在常溫蒸汽中養護6 h,再到高溫蒸壓養護8 h。通過骨料堿活性試驗方法中的評定方式對結果進行評定。試驗結果表明,堿骨料反應在高溫環境下可快速發生,且硅灰摻入量為10%時,能夠有效抑制堿骨料反應。 Abstract: The definition and classification of alkali aggregate reaction, reaction conditions, mechanism and preventive measures were introduced. Two groups of mortar specimens were made from dolomite. One group was made of pure cement. The other group was mixed with 10% silica fume to replace cement. The cement was maintained in standard curing box for 24 h. After demoulding, it was maintained in normal temperature steam for 6 h, and then in high temperature steam for 8 h. The results were evaluated by the evaluation method of the alkali activity test of aggregate. The results show that the alkali aggregate reaction can occur quickly under high temperature and the alkali aggregate reaction can be effectively inhibited by adding 10% silica fume.
    余洪方,鈕如嵩.國內預應力鋼筒混凝土管發展面臨問題的幾點思考與對策[J].混凝土與水泥制品,2019(11):30-32. YU H F,NIU R S.Thoughts and Countermeasures on Problems Faced by the Development of Prestressed Concrete Cylinder Pipes In China[J].China Concrete and Cement Products,2019(11):30-32.
    陶瓷預埋螺母在地鐵盾構隧道中的試驗研究
    陶瓷預埋螺母在地鐵盾構隧道中的試驗研究
    • 呂根喜1,曹偉飚 2,陳昌耀1,楊忠法1
    2019年第11期
    摘要
    引用本文
    為了提高盾構隧道內預埋件的防腐抗滲能力,結合實際工程,考慮選材、幾何形狀等因素,設計了預埋陶瓷螺母,并預埋在管片混凝土結構層中,與傳統C型預埋槽道進行了對比分析,其力學性能和使用功能能滿足設計要求,經濟性上也存在較大優勢。 Abstract: In order to improve the anti-corrosion and anti-seepage ability of shield tunnel, combined with the actual project, considering the factors of material selection and geometry, the embedded ceramic nuts are designed and embedded in the segment concrete structure layer. Compared with the traditional C-type embedded channel, the mechanical properties and use functions of the embedded channel can meet the design requirements, and there are also greater advantages in economy.
    明廷洪,余曉文,滕耀華,等.高溫飽和蒸汽環境下管樁混凝土的堿骨料反應研究[J].混凝土與水泥制品,2019(11):33-35. MING T H,YU X W,TENG Y H,et al.Study on the Alkali Aggregate Reaction of Concrete for Piles under High Temperature Saturated Steam Environment[J].China Concrete and Cement Products,2019(11):33-35.
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