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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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    第一期

    新拌UHPC凈漿的工作性與流變性試驗研究
    新拌UHPC凈漿的工作性與流變性試驗研究
    • 黃 靜1,季文玉1,閻培渝2
    2022年第1期
    摘要
    引用本文
    摘 ? 要:通過正交試驗研究了水膠比、超細粉煤灰摻量和硅灰摻量對新拌UHPC凈漿的工作性與流變性的影響,選取流動度、黏度系數和水膜層厚度為工作性與流變性的衡量指標,利用綜合平衡法獲得了最優配合比。試驗結果表明:水膠比、超細粉煤灰摻量和硅灰摻量的提高都會造成UHPC凈漿的流動度和顆粒表面水膜層厚度增大,黏度系數減??;超細粉煤灰摻量是凈漿工作性和流變性的主要影響因素,水膠比次之,硅灰摻量的影響最??;UHPC最優配合比:水膠比為0.2,超細粉煤灰摻量為40%,硅灰摻量為8%;以該配合比的成型的UHPC 28 d抗壓強度為128.8 MPa,抗拉強度為20.3 MPa,同時滿足工作性和力學性能要求,且經濟合理。 Abstract: An orthogonality test was carried out for study on the effect of W/C ratio, the superfine fly ash and silica fume content on workability and rheological properties of fresh paste of UHPC, and flow spread, consistency coefficient and water film thickness on particles were taken as the measures of workability and rheological properties. The comprehensive balance method was used to obtain the optimal mix proportion of UHPC. The results show that the increase of W/C ratio, the superfine fly ash and silica fume content of UHPC enhances its water film thickness on particles and flowability, reduces its coefficient of viscosity. The superfine fly ash content is the main factor that affects the workability and rheological properties of UHPC, followed by W/C ratio and silica fume content. The optimal mix proporition of UHPC of the W/C is 0.2, superfine fly ash content of 40% and silica fume content of 8%. The 28 d compressive strength of the UHPC is 128.8 MPa and its flexurary strength is 20.3 MPa. It shows a satisfied workability and mechanical properties, as well as a reasonable economy.
    黃靜,季文玉,閻培渝.新拌UHPC 凈漿的工作性與流變性試驗研究[J].混凝土與水泥制品,2022(1):1-6. HUANG J,JI W Y,YAN P Y.Experimental Study on Workability and Rheological Properties of Fresh Paste of UHPC[J].China Concrete and Cement Products,2022(1):1-6.
    陶砂對3D打印砂漿力學與微觀性能的影響
    陶砂對3D打印砂漿力學與微觀性能的影響
    • 陳傳峰,劉晨曦,李思琪,孫傳珍,馮竟竟
    2022年第1期
    摘要
    引用本文
    摘 ? 要:用陶砂部分替代河砂制備了3D打印砂漿,并對該砂漿的流動性、抗壓強度以及微觀孔結構進行了研究。試驗結果表明:砂漿的流動度在170~180 mm時具有良好的可打印性;隨陶砂摻量的增加,3D打印砂漿的抗壓強度降低,當陶砂的體積摻量為30%時,砂漿試件28 d的抗壓強度為14.7 MPa;隨著陶砂摻量的增大,砂漿3 d齡期的孔隙率呈現先增大后減小的趨勢,其中,陶砂體積摻量為30%時,砂漿的孔隙率最小,此時無害孔和少害孔所占的比例最大。 Abstract: Ceramic sand was used to partially replace river sand, and the fluidity, compressive strength and microscopic pores structure of 3D printed mortar were studied. The test results show that the mortar has good printability when the fluidity is 170~180 mm. With the increase of ceramic sand content, compressive strength of 3D printed mortar decreses. When the volume content of ceramic sand is 30%, the 28 d compressive strength of mortar test block is 14.7 MPa. With the increase of ceramic sand content, the porosity of mortar at 3 d increases first and then decreases. When the volume content of ceramic sand is 30%, the porosity of mortar is the smallest, and the proportion of harmless holes and less harmful holes is the largest.
    陳傳峰,劉晨曦,李思琪,等.陶砂對 3D 打印砂漿力學與微觀性能的影響[J].混凝土與水泥制品,2022(1):7-11. CHEN C F,LIU C X,LI S Q,et al.Influence of Ceramic Sand on Mechanical and Microscopic Properties of 3D Printed Mortar[J].China Concrete and Cement Products,2022(1):7-11.
    微珠對隧道工程混凝土性能的影響及機理研究
    微珠對隧道工程混凝土性能的影響及機理研究
    • 王 濤1,胡 琪1,吳紹明2,儲洪強1,陳 峰2,趙文文1,丁天云1,蔣林華1
    2022年第1期
    摘要
    引用本文
    摘 ? 要:針對廣州新白云國際機場隧道工程建設中大體積混凝土的溫度裂縫問題,通過復摻微珠和粉煤灰,研究了微珠摻量對混凝土的力學性能、干燥收縮、水化熱以及早期抗裂性能的影響,并采用SEM分析了微珠對水泥水化反應的作用機理。結果表明:當礦物摻合料總量一定時,隨著微珠摻量的增加,混凝土的力學性能早期變化較小,后期呈現出先增加后下降的趨勢,且微珠摻量為10%時,混凝土養護60 d的抗壓強度、劈裂抗拉強度以及彈性模量最高;混凝土干縮率隨著微珠摻量的增加而減小,且這種趨勢隨齡期的增加而增大,當微珠摻量15%時,60 d混凝土的干縮率最??;當微珠摻量為10%時,混凝土早期抗裂性能最佳,平板試件表面24 h內無裂縫;微珠摻量對膠凝材料水化熱總量影響較小,但對水化放熱峰值及峰值產生時間影響較大;微珠可以加速漿體早期的水化進程,減少硬化漿體的孔隙,使其結構更密實。 Abstract: In order to solve the temperature crack problem of the mass concrete structure in the construction of the Guangzhou New Baiyun International Airport tunnel engineering, the mechanism and effect of microbeads content on the macro-performance of concrete were performed, which specifically includes mechanical properties, dry shrinkage performance, heat hydration and early cracking resistance. Moreover, SEM was used for exploring the influence of microbeads on the hydration of cement. The results show that with the increase of microbeads content, the mechanical properties of concrete present no changes in the early stages, and increases first, then decreases in the later stages when the total content of mineral admixture is unchanged. When microbeads content is 10%, the compressive strength, splitting tensile strength and elastic modulus of concrete at 60 d are the highest. The dry shrinkage rates of concrete decrease with the increase of microbeads content, and the improvement becomes even bigger with the increase of curing age. The dry shrinkage of concrete at 60 d is the smallest when the content of microbeads is 15%. The early cracking resistance of concrete is the best with 10% microbeads, which can be manifested as no obvious cracks on the surface of the flat specimen within 24 h. Microbeads has little impact on the total hydration heat, and has a great influence on the peak and its arrival time of hydration exothermic rate. Microbeads can accelerate the early hydration process of cement and decrease the porosity of cement paste, which can make microstructure denser.
    王濤,胡琪,吳紹明,等.微珠對隧道工程混凝土性能的影響及機理研究[J].混凝土與水泥制品,2022(1):12-16,21. WANG Tao, HU Qi, WU Shao-ming,et al.Mechanism and Effect of Microbeads on the Properties of Concrete for the Tunnel Engineering[J].China Concrete and Cement Products,2022(1):12-16,21.
    隧道襯砌混凝土抗溶蝕性能影響因素研究
    隧道襯砌混凝土抗溶蝕性能影響因素研究
    • 田 釗1,周 瑩2,3,伍 洲1,穆 松2,3,張建喜4,劉 凱2,3
    2022年第1期
    摘要
    引用本文
    摘 ? 要:以廣東某隧道工程為例,研究了水膠比、礦物摻合料和砂率對混凝土早期抗壓強度、抗滲性能、抗氯離子滲透性能和抗溶蝕性能的影響。結果表明:隨著水膠比的減小,混凝土早期抗壓強度、抗滲性能、抗氯離子滲透性能和抗溶蝕性能均提高;摻入適量的礦物摻合料降低了混凝土的早期抗壓強度和抗滲性能,但提高了混凝土的抗氯離子滲透性能和抗溶蝕性能;隨著砂率的增加,混凝土的早期抗壓強度先降低后提高,抗滲性能、抗氯離子滲透性能、抗溶蝕性能提高,最佳砂率為45%;綜合對比得到了各因素對混凝土抗溶蝕性能的提高效果為:水膠比>礦物摻合料>砂率。 Abstract: Taking a tunnel project in Guangdong as an example, the effects of water-binder ratio, mineral admixture and sand ratio on the early compressive strength, impermeability, resistance to chloride ion penetration and corrosion resistance of concrete were studied. The results show that as the water-binder ratio decreases, the early compressive strength, impermeability, resistance to chloride ion penetration and corrosion resistance of concrete all increase. The appropriate addition of mineral admixtures reduces the early compressive strength and impermeability of concrete, but improves the resistance to chloride ion penetration and corrosion resistance of concrete. As the sand ratio increases, the early compressive strength of concrete decreases first and then increases, and the impermeability, resistance to chloride ion penetration, and corrosion resistance are improved. The best sand ratio is 45%. Comprehensive comparison of the effects of various factors on the anti-corrosion performance of concrete is: water-binder ratio>mineral admixture>sand ratio.
    田釗,周瑩,伍洲,等.隧道襯砌混凝土抗溶蝕性能影響因素研究[J].混凝土與水泥制品,2022(1):17-21. TIAN Z,ZHOU Yi,WU Z,et al.Study on Factors Affecting the Corrosion Resistance Performance of Tunnel Lining Concrete[J].China Concrete and Cement Products,2022(1):17-21.
    低溫環境下石灰巖機制砂砂漿抗硫酸鹽侵蝕性能研究
    低溫環境下石灰巖機制砂砂漿抗硫酸鹽侵蝕性能研究
    • 鄧俊雙1,徐志華1,李北星2,李 龍2
    2022年第1期
    摘要
    引用本文
    摘 ? 要:為研究低溫環境下石灰巖機制砂及石粉對混凝土抗硫酸鹽侵蝕性能的影響,以摻/未摻石灰巖石粉的機制砂砂漿、摻/未摻石灰巖石粉的天然砂砂漿為模擬對象,結合硫酸鹽腐蝕介質及低溫環境特點,采用溫度(5±1)℃的5%的MgSO4溶液模擬服役環境,對比研究了不同腐蝕齡期(0 d、60 d、90 d、210 d、270 d、360 d)試件的外觀和強度變化,并基于XRD、FTIR測試分析了侵蝕產物。結果表明:隨著齡期的增長,侵蝕方式由傳統的鈣礬石型硫酸鹽侵蝕逐漸過渡到以碳硫硅酸鈣為侵蝕產物的TSA巖侵蝕;石灰巖機制砂和石粉均能促使砂漿產生TSA侵蝕,且石粉的影響更加明顯。 Abstract: In order to study the influence of limestone manufactured sand and limestone rock fines on the sulfate resistance of concrete under low temperature environment, the two kinds of manufactured sand mortars mixed with or without limestone rock fines, and the two kinds of natural sand mortars incorporated with or without limestone rock fines were used as the simulate objects. Combined with the characteristics of sulfate corrosion medium and low temperature environment, 5% magnesium sulfate solution at (5±1)℃ was used to simulate the service environment. The changes of appearance and strength for the mortar specimens at different corrosion ages (0 d, 60 d, 90 d, 210 d, 270 d, 360 d) were compared and studied, and the corrosion products were analyzed by X-ray diffraction (XRD) and fourier transform infrared spectroscopy (FTIR). The results show that with the increase of erosion age, the erosion mode gradually transits from traditional ettringite type sulfate attack to thaumasite sulfate attack (TSA) with thaumasite as the erosion product. Limestone manufactured sand and limestone rock fines all can promote the TSA of mortar and concrete, and the effect of limestone rock fines is more obvious.?
    鄧俊雙,徐志華,李北星,等.低溫環境下石灰巖機制砂砂漿抗硫酸鹽侵蝕性能研究[J].混凝土與水泥制品,2022(1):22-26. DENG J S,XU Z H,LI B X,et al.Sulfate Resistance of Limestone Manufactured Sand Mortar in Low Temperature Environment[J].China Concrete and Cement Products,2022(1):2022(1):22-26.
    基于細觀模型的混凝土力學性能研究進展
    基于細觀模型的混凝土力學性能研究進展
    • 程 想,曹俊鑫,王玲玲,趙銀霜,孔德文
    2022年第1期
    摘要
    引用本文
    摘 ? 要:通過細觀模型預測方法建立了混凝土骨料特性與宏觀力學性能的聯系,可實現混凝土力學性能的預測。歸納了混凝土細觀模型的主要結構形式及建模方法,總結了骨料體積率、形狀、粒徑尺寸等對混凝土靜、動態力學性能的影響規律,闡述了骨料體積率、分布形式、粒徑尺寸等因素對混凝土強度與彈性模量的影響程度。提出了細觀模型預測混凝土宏觀力學性能研究中待解決的問題。 Abstract: The relationship between the properties of concrete aggregates and the macro-mechanical properties is established through the meso-model prediction method, which can realize the prediction of the concrete mechanical properties. The main structural forms and modeling methods of the concrete meso-model are summarized, and the influence laws of aggregate volume rate, shape, particle size on the static and dynamic mechanical properties of concrete are summarized, and the influence degree of aggregate volume rate, distribution form, and particle size on the strength and elastic modulus of concrete are described. The problems to be solved in the study of the meso-model predicting the macro-mechanical properties of concrete are put forward.
    程想,曹俊鑫,王玲玲,等.基于細觀模型的混凝土力學性能研究進展[J].混凝土與水泥制品,2022(1):27-32,37. CHENG X,CAO J X,WANG L L,et al.Research Progress in Mechanical Properties of Concrete Based on the Mesoscopic Model[J].China Concrete and Cement Products,2022(1):27-32,37.
    珊瑚混凝土的尺寸效應及損傷破壞特征研究
    珊瑚混凝土的尺寸效應及損傷破壞特征研究
    • 郭德豪1,張 妍2,周 聰3,黃玉榮4,尚致晨5
    2022年第1期
    摘要
    引用本文
    摘 ? 要:利用MTS試驗系統,研究了珊瑚混凝土的早期強度增長規律、單軸壓縮強度的尺寸效應、破壞模式以及損傷演化特征。結果表明:海水拌制的珊瑚混凝土具有明顯的早強特點,養護3 d和7 d試件的相對強度分別可達到0.84和0.90;高徑比(長寬比)對試件的單軸壓縮強度有較大影響,高徑比(長寬比)越大,試件的峰值強度越大,殘余強度越小,且表現出顯著的脆性破壞特征;單軸壓縮條件下,珊瑚混凝土的破壞模式以張拉破壞為主,其破壞形態為斷裂裂紋貫穿骨料破壞;借助聲發射系統,監測到聲發射振鈴數與試件的宏觀力學性能緊密相關。 Abstract: The MTS test system was utilized to study the early strength growth law, size effect of uniaxial compression strength, failure mode and damage evolution of coral aggregate concrete. The results show that coral aggregate concrete mixed by seawater has obvious characteristics of early strength and its relative strength after curing 3 d and 7 d can reach 0.84 and 0.90 respectively. The uniaxial compressive strength of specimens is significantly affected by height-diameter ratio(length-width ratio). The higher the height-diameter ratio(length-width ratio) is, the higher the peak strength is and the smaller the residual strength is, showing a significant brittle failure characteristic. Under uniaxial compression, the main failure mode of coral aggregate concrete is tensile failure and its fracture surface runs through the aggregate. With the aid of the acoustic emission system, the number of acoustic emission ringing is closely related to the macro-mechanical properties of the specimen.
    郭德豪,張妍,周聰,等.珊瑚混凝土的尺寸效應及損傷破壞特征研究[J].混凝土與水泥制品,2022(1):33-37. GUO D H,ZHANG Y,ZHOU C,et al.Study on Size Effect and Failure Characteristics of Coral Aggregate Concrete[J].China Concrete and Cement Products,2022(1):33-37.
    纖維種類對超高性能混凝土電桿性能的影響研究
    纖維種類對超高性能混凝土電桿性能的影響研究
    • 駱靜靜1,田 寅1,張立力1,陳晶晶1,王 濤2,蘇 強2
    2022年第1期
    摘要
    引用本文
    摘 ? 要:為研究聚丙烯纖維(PP纖維)、耐堿玻璃纖維(BX纖維)、鋼纖維(GX纖維)對超高性能混凝土(UHPC)電桿力學性能和耐久性能的影響,在前期摻量優選試驗基礎上,采用臥式離心工藝成型了規格為?覫190×12×M×BY的UHPC 電桿,并進行了力學性能和耐久性能試驗。結果表明:不同纖維種類對UHPC 折壓比的影響從高到底依次為:GX纖維、BX纖維、PP纖維;三種纖維均可提高UHPC 的耐久性,但效果不顯著;三種纖維對UHPC 電桿力學性能的影響由高到低依次為:GX纖維、BX纖維、PP纖維;三種纖維UHPC 電桿均滿足相關標準要求,考慮電桿外觀和經濟性,可使用PP纖維和BX纖維生產UHPC 電桿。 Abstract: In order to study the effects of polypropylene fiber, alkali resistant glass fiber and steel fiber on the mechanical properties and durability of ultra-high performance concrete poles, based on the preliminary content optimization test, the ?覫190×12×M×BY ultra-high performance concrete poles were produced by horizontal centrifugal process, and the mechanical properties and durability tests were carried out. The results show that the effects of different fiber types on the flexural compression ratio of ultra-high performance concrete from high to low are steel fiber, alkali resistant glass fiber and polypropylene fiber. Three kinds of fibers can improve the durability of ultra-high performance concrete, but the effect is not significant. The effects of three fibers on the mechanical properties of UHPC poles ?from high to low are steel fiber, alkali resistant glass fiber and polypropylene fiber. Three kinds of fibers all can meet the requirements of relevant standards. Considering the appearance and economy of poles, polypropylene fiber, alkali resistant glass fiber can be recommended to used to produce UHPC poles.
    駱靜靜,田寅,張立力,等.纖維種類對超高性能混凝土電桿性能的影響研究[J].混凝土與水泥制品,2022(1):38-40. LUO J J,TIAN Y,ZHANG L L,et al.Study on the Influence of Fiber Types on the Performance of Ultra-high Performance Concrete Poles[J].China Concrete and Cement Products,2022(1):38-40.
    C105管樁混凝土設計參數取值的探討
    C105管樁混凝土設計參數取值的探討
    • 何友林,茹軍輝,李 龍
    2022年第1期
    摘要
    引用本文
    通過試驗得出了C105混凝土100 mm×100 mm×100 mm立方體非標準試件抗壓強度換算系數以及C105混凝土的標準方差和強度變異系數。采用理論計算,得到了棱柱體抗壓強度與立方體抗壓強度的比值αc1,并與試驗實測平均值進行了比較,驗證了理論計算方法的可行性。此外,通過對比分析,探討了直接外延法和引用公式法兩種C105混凝土設計參數計算方法的正確性,研究結果可為C105管樁混凝土的設計和應用提供參考。 Abstract: The conversion coefficient of C105 concrete compressive strength was obtained for the size of the 100 mm×100 mm×100 mm cubic specimen by testing. And the standard deviation and strength variable coefficient were obtained by statistical analysis. The ratio αc1 of prismatic compressive strength to cubic compressive strength was obtained by theoretical calculation, and compared with the measured average value, which verifies the feasibility of the theoretical calculation method. In addition, through the comparative analysis, the correctness of the direct epitaxy method and quoted formula method of C105 concrete design parameters was systematically discussed, and the research results can provide a reference for the design and application of C105 pile concrete.
    何友林,茹軍輝,李龍.C105管樁混凝土設計參數取值的探討[J].混凝土與水泥制品,2022(1):41-43,47. HE Y L,RU J H,LI L.Discussion on Design Parameters Value Selection of C105 Piles Concrete[J].China Concrete and Cement Products,2022(1):41-43,47.
    預制管片混凝土裂縫控制技術研究
    預制管片混凝土裂縫控制技術研究
    • 溫泉武
    2022年第1期
    摘要
    引用本文
    摘 要:為抑止混凝土收縮,配制出滿足工作性、力學性能、耐久性要求,又經濟合理的預制管片用混凝土,依據SL/T 352—2020《水工混凝土試驗規程》,通過降低混凝土漿體總量等方法,試驗研究了不同水膠比和粉煤灰摻量對管片用混凝土強度的影響。在配合比優選基礎上,提出了管片生產澆筑和養護過程中的工藝控制措施,可為管片的生產提供參考。 Abstract: In order to inhibit concrete shrinkage, and prepare precast segment concrete that meets the requirements of workability, mechanical properties and durability, according to the SL/T 352—2020 Test Code for Hydraulic Concrete, the effects of different water binder ratio and fly ash content on concrete strength are studied by reducing the total amount of concrete slurry. On the basis of mix proportion optimization, the precautions in the process of segment production, pouring and maintenance are put forward, which can provide technical solutions for the production site.
    溫泉武.預制管片混凝土裂縫控制技術研究[J].混凝土與水泥制品,2022(1):44-47. WEN Q W.Research Crack Control Technology of Precast Segment Concrete[J].China Concrete and Cement Products,2022(1):44-47.
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