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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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    第十期

    微生物誘導沉積碳酸鈣機理及其在混凝土裂縫修復中的應用
    微生物誘導沉積碳酸鈣機理及其在混凝土裂縫修復中的應用
    • 代光志,徐瀟航,丁 聰
    2020年第10期
    摘要
    引用本文
    摘 ? 要:對光合生物誘導沉積、硫酸鹽還原菌誘導沉積、氮循環菌誘導沉積等微生物誘導沉積碳酸鈣(MICP)機制進行了回顧,分別闡述了不同機制的作用機理,并探討了不同機制在混凝土裂縫修復中的應用研究進展。此外,還分析了目前MICP修復技術存在的問題和局限性,對未來的進一步研究提出了思路和建議。 Abstract: An overview of the main mechanisms of microbial induced carbonate precipitation(MICP) is offered, such as photosynthetic organism-induced deposition, sulfate-reducing bacteria-induced deposition, and nitrogen cycle bacteria-induced deposition. The latest research on application of different mechanisms in repairing concrete cracks is reviewed respectively. Furthermore, current problems and limitations of MICP technology are analyzed, and insights and suggestions for further research are put forward.?
    代光志,徐瀟航,丁聰.微生物誘導沉積碳酸鈣機理及其在混凝土裂縫修復中的應用[J].混凝土與水泥制品,2020(10):1-7. DAI G Z,XU X H,DING C.Review of Mechanism of Microbial Induced Carbonate Precipitation and Its Application in Healing Concrete Cracks[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(10):1-7.
    超高強混凝土降黏型超支化聚羧酸減水劑的應用研究
    超高強混凝土降黏型超支化聚羧酸減水劑的應用研究
    • 王方剛1,2,陸加越1,2,楊 勇1,2,林 瑋1,2,劉建忠1,2,龔志煒3
    2020年第10期
    摘要
    引用本文
    摘 ? 要:通過凈漿流動度、流變特性、吸附行為對自研發的減水劑進行了評價,優選出了降黏型超支化聚羧酸減水劑(PCE)。結果表明:同摻量時,超支化PCE-2、PCE-3的流動度大于梳狀PCE-1;隨著時間的延長,PCE-1流動度逐漸降低,而PCE-2和PCE-3的流動度在60 min內不損失,且略有提升;相同剪切速率下PCE-2和PCE-3的剪切應力和黏度均明顯低于PCE-1,PCE-1存在剪切變稠現象,尤其是低水灰比(0.2)時剪切變稠現象更明顯;PCE-2和PCE-3的吸附量遠高于PCE-1,低水灰比(0.2)時PCE-1的吸附量與PCE-2和PCE-3的差距變小,但PCE-1在20 min后吸附量增長緩慢,明顯低于PCE-2和PCE-3。降黏型超支化聚羧酸減水劑在實際工程應用中效果較好。 Abstract: The degree of paste fluidity, rheological behavior, and adsorption performance tests were used to evaluate the dispersion properties of PCE, and a viscosity reducing hyperbranched polycarboxylate superplasticizer was selected. The results show that the fluidity of hyperbranched PCE-2 and PCE-3 is greater than that of comb-like PCE-1 when the dosage is mixed, and the fluidity of PCE-1 decreases gradually with time, while the fluidity of PCE-2 and PCE-3 won′t lose within 60 min and increases slightly. At the same shear rate, the shear stress and viscosity of PCE-2 and PCE-3 are significantly lower than that of PCE-1, and PCE-1 has the phenomenon of shear thickening, especially at a low water-cement ratio(0.2). The adsorption capacity of PCE-2 and PCE-3 is much higher than that of PCE-1, and the difference between the adsorption capacity of PCE-1 and that of PCE-2 and PCE-3 is smaller at low water-cement ratio(0.2), and the adsorption capacity of PCE-1 increases very slowly after 20 min, which is significantly lower than that of PCE-2 and PCE-3. Viscosity reducing hyperbranched polycarboxylate superplasticizer has been successfully applied in actual engineering project.
    王方剛,陸加越,楊勇,等.超高強混凝土降黏型超支化聚羧酸減水劑的應用研究[J].混凝土與水泥制品,2020(10):8-11,16. WANG F G,LU J Y,YANG Y,etal.Study on the Application of Viscosity Reducing Hyperbranched Polycarboxylate Superplasticizer for UHSC[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(10):8-11,16.
    礦物摻合料對高性能混凝土耐久性的影響
    礦物摻合料對高性能混凝土耐久性的影響
    • 田 帥1,2,呂劍鋒1,李世華1,2,王俊杰1,王模弼1
    2020年第10期
    摘要
    引用本文
    摘 ? 要:研究了粉煤灰、礦渣粉的不同摻入方式對高性能混凝土(HPC)抗氯離子滲透性能及抗凍性能的影響。結果表明:在相同水膠比條件下,隨著礦物摻合料摻量的增加,HPC的抗壓強度逐漸降低;摻入適量的礦物摻合料可有效降低HPC的電通量,改善抗氯離子滲透性能;當礦物摻合料摻量為40%,且粉煤灰和礦渣粉質量復摻比例為3∶1時,HPC在28 d與84 d的電通量分別為641.6 C和380.5 C;在水膠比及含氣量不變的情況下,隨著礦物摻合料摻量的增加,HPC的抗凍性能逐漸變差,而未摻礦物摻合料的HPC抗凍性能最好,抗凍等級為F200。? Abstract: The effect of different mixing methods of fly ash and slag powder on the anti-chloride ion permeability and frost resistance of high performance concrete (HPC) were studied. The results show that the compressive strength of HPC decreases with the increase of mineral admixture when the water-binder ratio and air content are unchanged. The appropriate amount of mineral admixture can effectively reduce the electrical flux of HPC. And the resistance of HPC to chloride ion penetration is improved. When the content of mineral admixture is 40% and m(fly ash)∶m(slag powder) is 3∶1, the electric flux of concrete at the 28 d and 84 d is 641.6 C and 380.5 C respectively. With the addition of mineral admixtures, the frost resistance of concrete gradually deteriorates. The antifreeze performance of HPC without mineral admixture is the best, and the antifreeze grade is F200.? ?
    田帥,呂劍鋒,李世華,等.礦物摻合料對高性能混凝土耐久性的影響[J].混凝土與水泥制品,2020(10):12-16. TIAN S,LYU J F,LI S H,et al.The Effect of Mineral Admixtures on the Durability Performance of High Performance Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(10):12-16.
    混凝土抗侵蝕防腐劑抗蝕系數試驗方法研究
    混凝土抗侵蝕防腐劑抗蝕系數試驗方法研究
    • 劉 立1,丁小富2,李長成1,鄭永輝1,賈福杰1,趙順增1,吳 勇1
    2020年第10期
    摘要
    引用本文
    摘 ? 要:以40 mm×40 mm×160 mm試件替代10 mm×10 mm×60 mm試件(A法),建立了混凝土抗侵蝕防腐劑抗蝕系數試驗方法(B法)。保持養護及腐蝕制度不變,按灰砂比1∶6,流動度(250±5)mm確定了水膠比,使侵蝕溶液濃度提高至15%,分別測試20 ℃侵蝕溶液中和水中90 d砂漿試件的抗壓強度,以抗壓強度比確定90 d抗蝕系數。結果表明:B法的90 d抗蝕系數與原A法的28 d抗蝕系數結果相吻合,B法是可行的。 Abstract: The corrosion resistance coefficient test method B for environmental corrosion-resistance admixture was established. The traditional 10 mm×10 mm×60 mm specimen (test method A) was replaced by 40 mm×40 mm×160 mm mortar specimen, while the curing and corrosion system remained unchanged, water-cement ratio was determined according to the mortar fluidity of (250±5)mm and the cement-sand ratio was 1∶6. The concentration of corrosion solution was increased to 15%. The compressive strength of mortar in corrosion solution and mortar in water at 20 ℃ for 90 d were tested, respectively. And the corrosion resistance coefficient at 90 d was determined by the compressive strength ratio. The results show that the corrosion resistance coefficient at 90 d of method B is consistent with the corrosion resistance coefficient at 28 d of the original method A. Therefore, test method B is feasible.
    劉立,丁小富,李長成,等.混凝土抗侵蝕防腐劑抗蝕系數試驗方法研究[J].混凝土與水泥制品,2020(10):17-20. LIU L,DING X F,LI C C,et al.Study on the Corrosion Resistance Coefficient Test Method for Environmental Corrosion-resistance Admixture[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(10):17-20.
    混凝土成熟度理論研究與應用現狀綜述
    混凝土成熟度理論研究與應用現狀綜述
    • 朱 然1,2,徐 俊1,2,占羿箭1,2
    2020年第10期
    摘要
    引用本文
    摘 ? 要:回顧了混凝土成熟度理論的發展歷程;梳理了國內外混凝土成熟度與混凝土強度之間相關的數學模型,并探討了各模型的適用范圍;最后概述了當前混凝土成熟度理論的應用現狀。 Abstract: The development history of concrete maturity theory is reviewed. The mathematical models related to concrete maturity and concrete strength at home and abroad are enumerated, and the applicable scope of each model is discussed. In addition, the current applications of concrete maturity theory are summarized. ?
    朱然,徐俊,占羿箭.混凝土成熟度理論研究與應用現狀綜述[J].混凝土與水泥制品,2020(10):21-26. ZHU R,XU J,ZHAN Y J.Review on the Research and Application of Concrete Maturity Theory[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(10):21-26.
    擾動對混凝土抗氯離子滲透性能的影響研究
    擾動對混凝土抗氯離子滲透性能的影響研究
    • 謝德擎1,2,穆 松1,2,劉建忠1,2,石 亮3,劉 凱1,2,劉光嚴1,2
    2020年第10期
    摘要
    引用本文
    摘 ? 要:利用改造后的擊頂式振篩機提供三維擾動,通過線切割內部偏心頂軸,使豎向振幅接近南京長江大橋公路橋橋面的實際振幅;配制C30、C50普通混凝土和摻抗擾動劑的C50混凝土,設計7種擾動制度,研究了各擾動制度對混凝土抗氯離子滲透性能(RCM)的影響。研究結果表明:C30混凝土終凝前1 h受擾動,上部試塊RCM值增幅最大,增幅為70.4%;C50混凝土終凝時受擾動,上部試塊RCM值增幅最大,增幅為95%;該階段混凝土的可塑性基本消失,受擾動后局部密實度降低,RCM值增大明顯。摻入抗擾動劑可以實現混凝土“初期增稠”與“早期增強”,大幅提升普通混凝土的整體抗擾動性能,相比于自身未擾動組,受各擾動制度后RCM值幾乎沒有降低。 Abstract: Using the modified test-sieving machine to provide three-dimensional disturbance, the vibration amplitudes were close to the actual amplitudes of the road bridge deck of Nanjing Yangtze river bridge by cutting the internal eccentric top shaft. Seven disturbance systems were designed to study the influence on rapid chloride ions migration coefficient (RCM) of C30、C50 ordinary concrete and C50 anti-disturbance concrete. The study results show that when C30 ordinary concrete is disturbed at 1 h before the final setting, the RCM value of upper block increases the most with an increase by 70.4%. When C50 ordinary concrete is disturbed at the final setting, the RCM value of the upper block increases the most, by 95%. At these stage, the plasticity of concrete basically disappears, leading to a decrease in compactness and a significant increase in RCM value. Adding disturbance resistance agent, the concrete can achieve ? ? ? "initial thickening" and "early strengthening", and improve the overall anti-disturbance performance. The RCM values before and after disturbance are almost the same.
    謝德擎,穆松,劉建忠,等.擾動對混凝土抗氯離子滲透性能的影響研究[J].混凝土與水泥制品,2020(10):27-30. XIE D Q,MU S,LIU J Z.Research on the Chloride Migration Coefficient Evolution of Concrete After Being Disturbed[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(10):27-30.
    泵送混凝土的工作性變化及應對方案研究
    泵送混凝土的工作性變化及應對方案研究
    • 劉 洋1,王 倩2,張露瑤2,王曉英1,付海平1,張新民1
    2020年第10期
    摘要
    引用本文
    摘 ? 要:從壓力、溫度、含氣量、氣泡聚并等角度研究了泵送條件下混凝土工作性變差的原因,提出了相應的解決方案。研究結果表明:在有效減水劑不足的情況下,泵壓力可促使漿體發生稠化;含氣量損失不是混凝土經泵稠化的原因;氣泡排液和聚并會使混凝土經泵稀化;在緩釋型聚羧酸減水劑摻量較高的情況下,經泵溫升可促使漿體發生稀化;通過調整減水劑組分和摻量可有效緩解泵送條件下混凝土流動性變差的問題。 Abstract: The relative influence factors of changes in fluidity of concrete induced by pumping were studied. Some countermeasures were provided by concrete admixture adjustment. The results show that the pumping pressure accelerates the fluidity loss of the fresh paste containing insufficient dosage of superplasticizer. Air content loss is not the influential fator of pumping-thicking. Bubble coalescence promotes pumping-thinning. Temperature-rise can bring pumping-thinning in concrete containing sufficient dosage of superplasticizer with slump retention capacity. The adverse effects of pumping-thinning or pumping-thicking can be avoided by adjustment of concrete pumping agent.
    劉洋,王倩,張露瑤.泵送混凝土的工作性變化及應對方案研究[J].混凝土與水泥制品,2020(10):31-36. LIU Y,WANG Q,ZHANG L Y,Study on the Workability Changes of Pumping Concrete and Its Countermeasures[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(10):31-36.
    預制清水混凝土看臺深化設計關鍵技術研究
    預制清水混凝土看臺深化設計關鍵技術研究
    • 李亞娟
    2020年第10期
    摘要
    引用本文
    摘 ? 要:為達到預制清水看臺整體效果要求,結合廣東省亞青會體育場項目,進行了預制清水混凝土看臺深化設計,研究了特殊部位連接構造、電氣預留預埋技術和細部設計技術,實現了結構和電氣設計一體化的目的,可為類似工程提供參考。 Abstract: In order to achieve the overall effect requirements of prefabricated fair-faced concrete stand, combined with the project of Guangdong Asian Youth Games Stadium, the in-depth design of precast fair faced concrete stands was carried out, and the connection structure of special parts, electrical reservation and embedding technology and detail design technology were studied. The integration of structural and electrical design are designed, which can provide a reference for the similar projects.
    李亞娟.預制清水混凝土看臺深化設計關鍵技術研究[J].混凝土與水泥制品,2020(10):37-41. LI Y J.Research on Key Technology of Deepening Design of Precast Fair-faced Concrete Stand[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(10):37-41.
    預制裝配化艙格式擋墻設計及應用研究
    預制裝配化艙格式擋墻設計及應用研究
    • 李昊煜1,2,趙華宏1,2,董 閣1,2
    2020年第10期
    摘要
    引用本文
    摘 ?要:為簡化施工工序、節省勞動力、提高工程質量,基于拓撲優化理論,設計了預制裝配化艙格式擋墻的結構形式,運用有限元仿真分析軟件,優化了連接細節。最后結合具體工程應用,分析了預制裝配化艙格式擋墻在經濟性、環保等方面存在的優勢,可為其推廣應用提供參考。 Abstract: In order to simplify the construction process, reduce the labor force and improve the engineering quality, based on the topology optimization theory, the structural form of prefabricated chanberd retaining wall is designed, and the connection details are optimized by using the finite element simulation analysis software. Finally, combined with the specific engineering application, the advantages of prefabricated prefabricated cabin retaining wall in economy and environmental protection are analyzed, which provides a reference for its popularization and application.
    李昊煜,趙華宏,董閣.預制裝配化艙格式擋墻設計及應用研究[J].混凝土與水泥制品,2020(10):42-44.,50 LI H Y,ZHAO H H,DONG G.Research on Design and Application of Prefabricated Chanberd Retaining Wall[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(10):42-44,50.
    BFRP筋/鋼筋混合配筋混凝土梁抗彎試驗與有限元分析
    BFRP筋/鋼筋混合配筋混凝土梁抗彎試驗與有限元分析
    • 付 瑩1,孔祥清2,于 洋2,高紅軍3
    2020年第10期
    摘要
    引用本文
    摘 ? 要:通過抗彎性能試驗,分析了玄武巖纖維增強筋(BFRP筋)/鋼筋混合配筋混凝土梁的承載力、破壞形態、撓度及裂縫發展情況。在試驗基礎上利用ANSYS軟件建立了BFRP筋/鋼筋混合配筋混凝土梁的三維有限元數值分析模型,并與試驗結果進行了對比。在數值分析模型基礎上研究了FRP筋類型及其布置方式對混合配筋混凝土梁抗彎性能的影響。結果表明:BFRP筋/鋼筋混合配筋混凝土梁的破壞形式均為鋼筋屈服后受壓區混凝土被壓碎;配筋面積比Af /As越大,初裂荷載越小,裂縫總數越少,撓度逐漸增加;建立的數值分析模型能較準確地模擬BFRP筋/鋼筋混合配筋混凝土梁的抗彎性能;BFRP筋、AFRP筋(芳綸纖維增強筋)及GFRP筋(玻璃纖維增強筋)與鋼筋混合配筋混凝土梁的荷載-撓度曲線比較接近;與BFRP筋相比,CFRP筋(碳纖維增強筋)/鋼筋混合配筋混凝土梁的開裂荷載和極限荷載分別高14.2%和9.3%,最大撓度小35%左右;BFRP筋的布置方式(單層或雙層)對混合配筋混凝土梁抗彎性能的影響不大。 Abstract: Through flexural test, the flexural capacity, failure mode, flexibility deformation and crack distribution of basalt fiber reinforced bars (BFRP bars) and steel hybrid reinforced concrete beams were analyzed. Based on the test datas, a 3D finite element model of BFRP bars/steel hybrid reinforced concrete beams was established by using ANSYS software, and compared with the experimental results. Based on the numerical analysis model, the influence of FRP bar types and their arrangement on flexural performance of hybrid reinforced concrete beams was studied. The results show that the failure mode of BFRP bars/steel hybrid reinforced concrete beams is that the concrete in the compression zone is crushed after the steel bars yield. The larger the Af /As, the smaller the initial crack load, the smaller the total number of cracks, and the deflection is increased gradually. The established numerical analysis model can more accurately simulate the flexural performance of BFRP bars/steel hybrid reinforced concrete beams. The load-deflection curves of BFRP bars, AFRP bars, and GFRP bars and steel hybrid reinforced concrete beams are close. Compared with BFRP bars, the cracking load and ultimate load of CFRP bars/rebar hybrid reinforced concrete beams are 14.2% and 9.3% higher, respectively, and the maximum deflection is about 35% smaller. The arrangement of BFRP bars (single layer or double layer) has little effect on the flexural performance of hybrid reinforced concrete beams.
    付瑩,孔祥清,于洋,等.BFRP筋/鋼筋混合配筋混凝土梁抗彎試驗與有限元分析[J].混凝土與水泥制品,2020(10):45-50. FU Y,KONG X Q,YU Y,et al.Flexural Test and Finite Element Analysis of BFRP Bars/steel Hybrid Reinforced Concrete Beams[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(10):45-50.
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