第十二期_2020_《混凝土與水泥制品》雜志社

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第十二期

陽離子乳化瀝青對水泥水化及CA砂漿性能的影響

李煒1,2，朱文婷1,2，施宇磊1，2，洪錦祥3，楊鼎宜1,2

2020年第12期

摘要

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摘 ? 要：通過力學性能、化學結合水、水化程度、Ca(OH)2含量、漿體密實度和孔結構等試驗，研究了陽離子乳化瀝青對水泥水化的影響。結果表明：隨著乳化瀝青與水泥的質量比（A/C）從0增加到0.45，水泥-乳化瀝青（CA）砂漿的力學性能逐漸下降；化學結合水、水化程度和Ca(OH)2含量也隨之降低；超聲波速逐漸下降，漿體的孔徑和累積孔體積逐漸增加，CA砂漿的水化產物減少?？傊?，陽離子乳化瀝青抑制了水泥水化和微結構的形成。 Abstract: The influence of cationic asphalt emulsion on cement hydration was investigated by testing the mechanical properties, chemically bound water, hydration degree, content of calcium hydroxide, density of paste and the pore structure. The results show that with the increase of mass ratio of asphalt to cement(A/C) from 0 to 0.45, the compressive and flexural strength declines gradually. The content of chemically bound water, cement hydration degree and the formation of Ca(OH)2 also decreases. The velocity of ultrasonic wave of cement-asphalt mortar reduces, while the pore size and the cumulative pore volume of cement-asphalt paste increases gradually. The formation of cement hydration products of CA mortar reduces. All in all, the hydration of cement and the formation of microstructure are suppressed by cationic asphalt emulsion.?

李煒,朱文婷,施宇磊,等.陽離子乳化瀝青對水泥水化及CA砂漿性能的影響[J].混凝土與水泥制品,2020(12):1-5. LI W,ZHU W T,SHI Y L.The Influence of Cationic Asphalt Emulsion on Cement Hydration and Properties of CA Mortar[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(12):1-5.

不同水壓下混凝土斷裂能弱化效應試驗研究

胡少偉，王洋，孫岳陽，陸俊

2020年第12期

摘要

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摘 ? 要：為了研究混凝土在水力劈裂過程中的斷裂能變化規律，分析了水力劈裂中的各荷載做功，建立了水壓力下斷裂能的計算公式，開展了12組混凝土水力劈裂試驗，得出了水壓力對混凝土斷裂能的影響規律。結果表明：水壓力作用下混凝土的斷裂能減小，水壓力越大，混凝土的斷裂能越??；混凝土在水力劈裂過程中的斷裂能弱化效應不可忽略，在0.3 MPa水壓力下，該弱化效應隨水壓力增加呈線性遞增趨勢。 Abstract: In order to study the influence of water pressure on fracture energy of concrete under hydraulic fracturing, the work done by each load in hydraulic fracturing test was analyzed, the calculation formula of fracture energy under water pressure was established, and 12 groups of hydraulic fracturing tests of concrete were carried out. The results show that the fracture energy of concrete decreases under the action of water pressure, and the greater the water pressure, the smaller the fracture energy of concrete, which shows that the weakening effect of the fracture energy in the process of concrete hydraulic fracturing cannot be ignored, the weakening effect increases linearly with the increase of water pressure which not exceed 0.3 MPa.

胡少偉,王洋,孫岳陽,等.不同水壓下混凝土斷裂能弱化效應試驗研究[J].混凝土與水泥制品,2020(12):6-10. HU S W,WANG Y,SUN Y Y,et al.Experimental Study on Fracture Energy of Concrete Under Different Hydraulic Pressure[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(12):6-10.

粉煤灰對UHPC性能及微觀結構的影響

杭美艷1，孫忠科1，郭艷梅2

2020年第12期

摘要

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摘 ? 要：研究了粉煤灰取代量對超高性能混凝土（UHPC）的流動度、抗壓強度、抗折強度、微觀結構以及鋼纖維與基體黏結界面的影響。結果表明：粉煤灰取代量與混凝土流動度呈正相關；UHPC的抗壓強度隨粉煤灰取代量的增加呈先降低后升高的趨勢；UHPC的抗折強度隨粉煤灰取代量的增加呈先升高后降低的趨勢；通過SEM結果發現，隨粉煤灰取代量的增加，混凝土微觀結構的密實度呈先減小后增大的趨勢；UHPC基體與鋼纖維的黏結性能呈先增大后減小的趨勢。 Abstract: The effect of the replacecement amount of fly ash on fluidity, compressive strength, flexural strength, microstructure of UHPC and the bonding interface between steel fiber and UHPC matrix was studied. The results show that the replacement amount of fly ash is positively correlated with the fluidity of UHPC. The compressive strength of UHPC decreases first and then increases with the increase of the replacement amount of fly ash. The flexural strength of UHPC tends to increase first and then decrease with the increase of the replacement amount of fly ash. Through SEM scanning, it is found that the density of UHPC microstructure shows a decreasing trend with the increase of the replacement amount of fly ash and then increases. The bonding performance of UHPC matrix and steel fiber increases first and then decreases.

杭美艷,孫忠科,郭艷梅.粉煤灰對UHPC性能及微觀結構的影響[J].混凝土與水泥制品,2020(12):11-14,19. HANG M Y,SUN Z K,GUO Y M.Effect of Fly Ash on Property and Microstructure of UHPC [J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(12):11-14,19.

凍融損傷混凝土力學性能研究與等效凍融循環次數計算模型

齊檸1，戰美秋2，李梅1

2020年第12期

摘要

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摘 ? 要：為研究人工氣候環境下凍融損傷混凝土的力學性能退化規律，以凍融循環次數（FTCs）、混凝土強度為設計參數，共設計制作了21組混凝土試塊，先后對其進行凍融循環試驗與軸心受壓試驗。結果表明：隨凍融循環次數的增加，抗壓強度逐漸降低，且降低速率逐漸增大；不同強度等級混凝土的相對動彈性模量P均逐漸降低，且降低速率大致相等；隨設計混凝土強度等級的增大，相對抗壓強度增加，且增加速率逐漸增大；當凍融循環次數<100時，相對動彈性模量基本不變；當凍融循環次數>100時，相對動彈性模量則逐漸增大?；谠囼灲Y果，得到了不同凍融條件下的等效凍融循環次數計算模型，實現了不同凍融條件研究結果的相互利用與對比驗證。 Abstract: In order to study the degradation law of mechanical properties of frozen-thawed damage concrete in artificial climate, using the number of freeze-thaw cycles(FTCs) and concrete strength as design parameters, a total of 21 sets of cubic concrete test blocks were designed and manufactured. The freeze-thaw cycle test and the axial compression test were successively performed. The experimental results show that as the number of FTCs increases, the cubic compressive strength gradually decreases, and the decrease rate gradually increases. And the relative dynamic elastic modulus P of different strength levels gradually decreases, and the decrease rate is approximately equal. With the increase of design concrete strength grade, the relative compressive strength increases gradually, and the increasing rate increases gradually. The relative dynamic elastic modulus is basically unchanged when the number of FTCs is less than 100, and gradually increases when the number of FTCs is more than 100. Based on the test results, according to the principle of the same compressive strength loss, the artificial climate rapid freeze-thaw technique test conditions and the freeze-thaw conditions of "fast freeze method" are equivalent, and the calculation model of the equivalent FTCs under different freeze-thaw conditions is obtained, so as to realize the mutual utilization and comparative verification of the research results under different freeze-thaw conditions.

齊檸,戰美秋,李梅.凍融損傷混凝土力學性能研究與等效凍融循環次數計算模型[J].混凝土與水泥制品,2020(12):20-25. QI N,ZHAN M Q,LI M. Study on Mechanical Properties of Frost-damaged Concrete and Calculation Model of Equivalent Freeze-thaw Cycles [J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(11):20-25.

基于正交試驗的自密實重晶石混凝土配合比設計及性能研究

石建軍，凌顏，張志恒，劉華良，楊曉峰，王燦，張志君，李奇

2020年第12期

摘要

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摘 ? 要：采用重晶砂、重晶石作為自密實混凝土骨料，通過優化骨料級配、摻入適量的CRT玻璃粉和調整重晶石骨料比例等技術手段，成功配制出了工作性良好、表觀密度為3 200 kg/m3的自密實重晶石混凝土，并通過正交試驗研究砂率、水膠比和減水劑對混凝土工作性和抗壓強度的影響。結果表明：隨著砂率的增大，混凝土工作性降低，而抗壓強度逐漸增強；水膠比增大，V型漏斗時間和抗壓強度減少；減水劑用量增加可以提高混凝土的流動性，存在最佳摻量2.4%；使用功效系數法綜合分析得到了混凝土的最佳配合比為砂率45%，水膠比0.43，減水劑2.3%。 Abstract: Using heavy crystal sand and barite as aggregates of self-compacting concrete, the self-compacting barite concrete with good working performance and apparent density of 3 200 kg/m3 was successfully prepared by optimizing aggregate gradation, adding proper amount of CRT glass powder and adjusting the proportion of barite aggregate. The effects of sand ratio, water-binder ratio and water reducing agent on the workability and compressive strength of concrete were investigated by orthogonal test. The results show that as the sand rate increases, the working performance decreases, and the compressive strength gradually increases. As the water-binder ratio increases, the V-shaped funnel time and compressive strength decrease. As the amount of water reducing agent increases, the fluidity of the concrete increases first and then decreases, and there is an optimal content of 2.4%. The comprehensive analysis by the efficacy coefficient method is available. The best mix proportion is: sand rate 45%, water-binder ratio 0.43, water reducing agent 2.3%.

石建軍,凌顏,張志恒,等.基于正交試驗的自密實重晶石混凝土配合比設計及性能研究[J].混凝土與水泥制品,2020(12):15-19. SHI J J,LING Y,ZHANG Z H,et al.Mix Proportion Design and Performance Research of Self-compacting Barite Concrete Based on Orthogonal Test[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(12):15-19.

混凝土自崩實例分析

張亞濤，鄭繼，朱田生，徐良，吳超

2020年第12期

摘要

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摘 ? 要：基于工程實例中混凝土自崩現象，通過X射線熒光光譜分析、XRD分析和模擬試驗等對可疑物進行了辨別。結果表明：可疑物為鋼渣，其在混凝土中緩慢水化導致體積膨脹，最終造成表層混凝土自崩。同時，通過模擬試驗，分析了引起該類型混凝土自崩所需要的外部環境條件，并給出了防止該現象繼續發生的建議。 Abstract: Based on the phenomenon of concrete self-collapse in engineering examples, suspicious substances were identified through X-ray fluorescence spectrum analysis, XRD analysis and simulation tests. The results show that the suspicious substances are steel slag, which slowly hydrate in the concrete. It causes volume expansion and eventually causes the surface concrete to collapse. At the same time, through simulation tests, the external environmental conditions required to cause the concrete to collapse are analyzed, and some suggestions are provided to prevent this phenomenon from continuing.

張亞濤,鄭繼,朱田生,等.混凝土自崩實例分析[J].混凝土與水泥制品,2020(12):26-29. ZHANG Y T,ZHENG J,ZHU T S,et al.Analysis of Concrete Self-collapse[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(12):26-29.

PHC管樁拉-剪承載性能數值分析

呂鐸1，劉佳龍2，郭昭勝3，安增軍4,5，戴亞4,5

2020年第12期

摘要

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摘 ? 要：利用ABAQUS 有限元分析軟件建立了PHC600 B-130管樁樁身橫向受剪數值分析模型，分析了不同軸向拉力對空芯管樁和填芯管樁樁身抗剪承載性能的影響。結果表明，隨著軸向拉力的增大，兩類管樁樁身的開裂剪力和極限剪力均明顯降低，相應的極限位移也有降低，樁身延性下降，填芯混凝土對于管樁樁身抗剪承載力的提高效果顯著?；谝幏逗颓叭搜芯砍晒?，結合數值分析數據，提出了考慮軸拉力影響的空芯管樁和填芯管樁的抗剪承載力計算公式。 Abstract: Using ABAQUS finite element analysis software, the numerical analysis model of PHC600 B-130 pipe lateral shear was established, and the influence of different axial tension on the shear bearing performance of hollow pipes and core-filled pipes was analyzed. The results show that with the increase of axial tension, the cracking shear force and ultimate shear force of the two types of pipes are significantly reduced, the corresponding ultimate displacement is also reduced, and the ductility of the pipe is decreased, and the core-filled concrete has a significant effect on improving the shear bearing capacity of pipes. Based on the specifications and previous research results, combined with numerical analysis datas, the shear bearing capacity calculation formulas of hollow pipe and core-filled pipe considering the influence of axial tension are put forward.

呂鐸,劉佳龍,郭昭勝,等. PHC管樁拉-剪承載性能數值分析[J].混凝土與水泥制品,2020(12):30-35. LYU D,LIU J L,GUO Z S,et al. Numerical Analysis of Tensile-shear Bearing Performance of PHC Pipes[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(12):30-35.

CFRP修復預制混凝土管片界面滑移試驗研究

聶紅賓1，2，谷拴成2，何曉萍3，翟鑫懿1

2020年第12期

摘要

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摘 ?要：為了研究碳纖維高強復合材料（Carbon Fiber Reinforced Plastics，CFRP）在預制混凝土管片破損修復中的受力性能，以沿海某城市雙線地鐵盾構區間線路為項目依托，通過彎剪試驗研究了破損管片經過CFRP修復后的抗剪與滑移行為。試驗結果表明：隨著CFRP粘貼長度的增加，承載力提高較大，整體撓度也相應增加，剝離滑移發生在CFRP與混凝土界面；隨著層數的增加，承載力增加80%~100%，相對滑移下降60%~75%，抗剪能力提高180%；粘貼1層CFRP基本可滿足現行規范要求。 Abstract: In order to further study the mechanical properties of carbon fiber reinforced plastics (CFRP) in the repair technology of subway damaged tube segments, by relying project on the double subway shield section line in a coastal city, it was used to investigate that bending-shearing test method to study mechanical behavior of shield′s damaged segments repaired by CFRP. The results show that, in bending-shearing test, the bearing capacity of segments repaired by CFRP has a big improvement and deflection also adds and stripping damage happens at the interface of CFRP and concrete with CFRP′s length increasing. Bearing capacity is increased by 80%~100% and deflection is reduced by 60%~67% as increasing in the number of layers, it can effectively control the radial displacement. It results that it can completely meet the limitations of China′s existing norms that it pastes one layer of CFRP.

聶紅賓,谷拴成,何曉萍,等.CFRP修復預制混凝土管片界面滑移試驗研究[J].混凝土與水泥制品,2020(12):36-39. NIE H B,GU S C,HE X P,et al.Experimental Study on Interface Slip Behavior of Reinforced Concrete Segments by CFRP[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(12):36-39.

隧道花崗巖洞渣骨料在C50混凝土預制 T梁中的應用研究

鄭曉冬1，管志濤1，李超1，黃興1，李北星2

2020年第12期

摘要

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摘 ? 要：依托三峽翻壩江北高速公路項目，將隧道花崗巖洞渣加工成機制砂石骨料，并制備了C50混凝土預制T梁，通過T梁靜載試驗和T梁混凝土專用回彈測強曲線試驗，研究了花崗巖洞渣機制骨料在C50混凝土預制T梁中的應用技術。結果表明：利用花崗巖洞渣生產的機制砂石骨料可以配制出工作性、力學性能與耐久性優良的T梁用C50混凝土，且混凝土T梁的剛度、強度及抗裂性均滿足設計要求；通過試驗建立的T梁用C50混凝土專用回彈測強曲線較國家通用測強曲線更精確。 Abstract: Relying on the Three Gorges Fanba Jiangbei Highway Project, the tunnel granite cave slag was processed into machine-made sand and gravel aggregate, and the C50 concrete precast T-beams were prepared. Through T-beam static load test and T-beam concrete rebound strength test curve test, the application technology of granite cave slag machine-made aggregate in C50 concrete precast T-beam was studied. The results show that the machine-made sand and gravel aggregate produced from granite cave slag can be used to formulate C50 concrete for T-beams with excellent workability, mechanical properties and durability, and the stiffness, strength and crack resistance of the precast T-beams meet the design requirements. The special rebound strength test curve for C50 concrete for T-beams established through experiments is more accurate than the national general strength test curve.

鄭曉冬,管志濤,李超,等.鋼結構住宅用預制夾心保溫外掛墻板的設計與應用研究[J].混凝土與水泥制品,2020(12):40-44,49. ZHENG X D,GUAN Z T,LI C,et al. Research on Application of Tunnel Granite Cave Slag Aggregate in C50 Concrete Precast T-Beam[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(12):40-44,49.

耐堿玻纖增強陶?；炷亮W性能試驗研究

馬少春1,2,3，賈鵬舉1，鮑鵬1,3，袁其夢1

2020年第12期

摘要

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摘 ? 要：研究了陶粒取代率和耐堿玻璃纖維（耐堿玻纖）體積摻量對陶?；炷量箟簭姸?、比強度和彈性模量的影響。結果表明，耐堿玻纖陶?；炷恋目箟簭姸?、比強度和彈性模量均隨著陶粒取代率的增加而降低，當取代率達到20%后下降趨勢更加顯著。隨著耐堿玻纖摻量的增加，陶?；炷恋母黜椫笜司氏仍龃蠛鬁p小趨勢；當陶粒取代率在20%以內時，不同摻量耐堿玻纖陶?；炷恋谋葟姸染鶅炗谄胀ɑ炷?；當陶粒取代率為15%、耐堿玻纖摻量為0.3%時，比強度最優。 Abstract: The effects of the replacement rate of ceramsite and the volume content of alkali resistant glass fiber on the compressive strength, specific strength and elastic modulus of ceramsite concrete were studied. The results show that the compressive strength, specific strength and elastic modulus of alkali resistant glass fiber ceramsite concrete decrease with the increase of ceramsite replacement rate, and the decrease is more significant when the replacement rate reaches 20%. With the increase of alkali resistant glass fiber content, the indexes of ceramsite concrete increase first and then decrease. When the replacement rate of ceramsite is within 20%, the specific strength of alkali resistant glass fiber ceramsite concrete with different contents is better than that of ordinary concrete. When the replacement rate of ceramsite is 15% and the fiber content is 0.3%, the specific strength reaches the best state.

馬少春,賈鵬舉,鮑鵬,等.耐堿玻纖增強陶?；炷亮W性能試驗研究[J].混凝土與水泥制品,2020(12):45-49. MA S C,JIA P J,BAO P,et al. Experimental Study on Mechanical Properties of Alkali Resistant Glass Fiber Reinforced Ceramsite Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(11):45-49.

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