混凝土研究_2021_《混凝土與水泥制品》雜志社

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混凝土研究

再生大骨料自密實混凝土力學性能研究

王建超，趙豐磊，馬光卓，裘子銘

2021年第10期

摘要

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摘 ? 要：通過抗壓強度、劈裂抗拉強度、峰值壓應變、靜態彈性模量和應力-應變關系試驗，研究了自密實混凝土強度、再生大骨料強度、再生大骨料粒徑對再生大骨料自密實混凝土（RCASCC）力學性能的影響。采用數據擬合的方法對國內外典型混凝土單軸受壓應力-應變模型中的相關系數進行了修正，給出了適用于RCASCC的單軸受壓本構模型，分別建立了RCASCC抗壓強度、劈裂抗拉強度、峰值應變和彈性模量與自密實混凝土強度、再生大骨料強度、再生大骨料粒徑的函數關系式，并對4種本構模型的擬合程度進行了比較分析。結果表明：所擬合的三次多項式型曲線和三角函數型曲線與實際應力-應變關系吻合程度相對較高。 Abstract: The effects of the strength of self-compacting concrete, strength of recycled larger size aggregate, size of recycled larger size aggregate on mechanical properties of recycled larger size aggregate self-compacting concrete(RCASCC) were studied through compressive strength, splitting tensile strength, peak compressive strain, elastic modulus and stress-strain relationship tests. The data fitting method was used to correct the correlation coefficients in the typical uniaxial compression stress-strain models of concrete in China and abroad. A uniaxial compression constitutive model for RCASCC was presented. The functional relationship between the compressive strength/splitting tensile strength/peak strain /elastic modulus of RCASCC and the strength of self-compacting concrete, strength of recycled larger size aggregate, size of recycled larger size aggregate was established, and the fitting degree of the four constitutive models was compared and analyzed. The results show that the fitted cubic polynomial curve and trigonometric function curve are in relatively high agreement with the actual stress-strain relationship.

王建超,趙豐磊,馬光卓,等.再生大骨料自密實混凝土力學性能研究[J].混凝土與水泥制品,2021(10):1-6. WANG J C,ZHAO F L,MA G Z,et al.Study on Mechanical Properties of Recycled Larger Size Aggregate Self-compacting Concrete[J].China Concrete and Cement Products,2021(10):1-6.

3D打印混凝土技術研究綜述

盛蕾，武雷

2021年第10期

摘要

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摘 ? 要：基于國內外現有研究成果，闡述了3D打印混凝土的增強技術、材料性能以及硬化性能三部分內容，指出了3D打印技術在當前應用中存在的關鍵問題，并提出了今后的重點研究方向。 Abstract: Based on the existing research results at home and abroad, the reinforcement technology, the material properties and hardening properties of 3D printed concrete technology are summarized. Some key problems in the current application of this technology are pointed out, and the key research directions in the future are proposed.

盛蕾,武雷.3D打印混凝土技術研究綜述[J].混凝土與水泥制品,2021(10):7-11. SHENG L,WU L.Summary of 3D Printed Concrete Technology Research[J].China Concrete and Cement Products,2021(10):7-11.

基于正交試驗的硅粉-納米SiO2高強灌漿料性能研究

李政達1，王慶敏1，劉立群2，酈湫翰1，王振宇1

2021年第10期

摘要

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摘 ? 要：為了制備具有高流動性的高強灌漿料，進行了四因素三水平的正交試驗L9（34），研究了硅粉摻量、納米二氧化硅（NS）摻量、砂膠比、水膠比對硅粉-NS灌漿料的流動度、抗折強度、抗壓強度的影響。結合極差分析法，分析了各材料摻量變化對灌漿料流動度、抗折強度、抗壓強度的影響程度。結果表明：與NS相比，硅粉對灌漿料早期強度的影響較大；通過優化砂膠比和水膠比，可以配制出流動度好、強度高的硅粉-NS灌漿料。 Abstract: In order to produce high-strength grout with high fluidity, the orthogonal tests L9(34) with four control factors and three levels were carried out via the fluidity tests. The influence of silica fume content, nano-SiO2（NS） content, sand-binder ratio, W/B on the fluidity, flexural strength and compressive strength of silica fume-NS grout was studied. Combined with the range analysis method, the influence degree of each material content change on the fluidity, flexural strength and compressive strength of grout was analyzed. The results show that compared with NS, silica fume has a greater impact on the early strength. By optimizing the sand-binder ratio and W/B, a silica fume-NS grout with good fluidity and high strength can be prepared.

李政達,王慶敏,劉立群,等.基于正交試驗的硅粉-納米SiO2高強灌漿料性能研究[J].混凝土與水泥制品,2021(10):12-15. LI Z D,WANG Q M,LIU L Q,et al.Study on Properties of Silica Fume-nano-SiO2 High-strength Grout Based on Orthogonal Tests[J].China Concrete and Cement Products,2021(10):12-15.

超聲波檢測彎曲荷載作用下混凝土鹽凍損傷試驗研究

康希佞，劉杏娟，馮曉爽，趙勝利，劉燕

2021年第10期

摘要

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摘 ? 要：對不同粉煤灰摻量的鋼筋混凝土試件進行彎曲荷載下的鹽凍循環試驗，利用超聲波檢測研究了彎曲荷載大小、鹽凍循環次數對試件損傷的影響，并分析了超聲波波速變化率與彎曲荷載、鹽凍循環次數與混凝土損傷度的關系以及200次鹽凍循環下混凝土損傷層厚度與彎曲荷載、混凝土損傷度的關系。結果表明：彎曲荷載越大，鹽凍循環次數越多，超聲波波速變化率和試件的損傷層厚度越大，混凝土受損越嚴重；試件的超聲波波速變化率與鹽凍循環次數和彎曲荷載呈線性正相關關系；200次鹽凍循環時，試件的損傷層厚度與彎曲荷載呈正相關線性關系，試件的損傷度與超聲波波速變化率之間呈非線性正相關關系，與損傷層厚度之間呈對數關系。 Abstract: The salt-freezing cycle tests under the bending load state were carried out on the reinforced concrete specimens with different fly ash content. The influence of bending load and the number of salt-freezing cycles on concrete damage was studied by ultrasonic testing. The relationship between ultrasonic wave velocity change rate and bending load, salt-freezing cycle times and concrete damage degree, the thickness of damaged layer and the magnitude of bending load and concrete damage degree under 200 salt-freezing cycles was analyzed. The results show that the greater the bending load, the more salt-freezing cycles, the greater the ultrasonic wave velocity change rate and the thickness of damage layer of specimens, the more serious the concrete damage. The rate of change of ultrasonic wave velocity of specimens has a linear relationship with the number of salt-freezing cycles and the magnitude of the bending load. Under 200 times of salt- freezing cycles, the damage layer thickness of concrete has a positive linear relationship with bending load. There is a positive correlation and nonlinear relationship between the damage degree of the specimen and the rate of change of ultrasonic wave velocity, and the relationship between the damage degree and the thickness of damage layer is logarithmic.

康希佞,劉杏娟,馮曉爽,等.超聲波檢測彎曲荷載作用下混凝土鹽凍損傷試驗研究[J].混凝土與水泥制品,2021(10):16-20. KANG X N,LIU X J,FENG X S,et al.Experimental Study on the Salt Freeze Damage of Concrete Under Bending Load by Ultrasonic Testing[J].China Concrete and Cement Products,2021(10):16-20.

軸心受拉構件混凝土有效受拉面積的試驗研究

李金昌1，韓進舟2，李平先1，韓沖3

2021年第10期

摘要

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摘 ? 要：通過10根中心配置HRB400級鋼筋的混凝土棱柱體構件軸心受拉試驗，并結合已有的11根配置HRB335級鋼筋的相同構件試驗結果，探討了混凝土表面應變的變化以及鋼筋級別對軸心受拉構件混凝土有效受拉面積的影響。結果表明：在軸心受拉情況下，配置HRB335鋼筋和配置HRB400鋼筋的混凝土有效受拉面積略有差異；對配置HRB400和配置HRB335鋼筋的構件，混凝土有效受拉面積可分別按半徑為7.3d（d為鋼筋直徑）和7.4d的圓形面積計算，或分別按邊長為6.5d和6.6d的正方形面積計算。 Abstract: The axial tension behaviors of ten prism members with HRB400 steel bars and eleven prism members with HRB335 steel bars were investigated, and the effect of concrete strain and steel grade on the effective tensile cross-sectional area was explored. The results indicate that the effective tensile cross-sectional area of the concrete with HRB400 steel bar has a slightly different with that of the concrete with HRB335 steel bar under the condition of axial tension. A circular area with a radius of 7.3d (d is the diameter of the steel bar) or a 7.4d and a square area with a side length of 6.5d or a 6.6d are proposed respectively based on the experimental data with HRB400 or HRB335 steel bar.

李金昌,韓進舟,李平先,等.軸心受拉構件混凝土有效受拉面積的試驗研究[J].混凝土與水泥制品,2021(10):21-24. LI Jin-chang,HAN Jin-zhou,LI Ping-xian,et al.Experimental Research on Effective Tensile Area of Reinforced?Concrete Axial Tension Members[J].China Concrete and Cement Products,2021(10):21-24.

煤系偏高嶺土對煤矸石混凝土性能的影響研究

王安輝1，潘春宇1，黃益平1，張艷芳1，張舜泉2

2021年第10期

摘要

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摘 ? 要：為了提高煤矸石混凝土的力學與耐久性能，將煤系偏高嶺土部分取代率水泥，研究了不同取代率的煤系偏高嶺土對煤矸石混凝土抗壓強度、劈拉強度、耐磨性和抗硫酸鹽侵蝕性能的影響。結果表明：摻加煤系偏高嶺土可顯著提高煤矸石混凝土的力學性能；當煤系偏高嶺土取代率為30%時，煤矸石混凝土的抗壓強度和劈拉強度均最大；摻入適量煤系偏高嶺土能夠有效改善煤矸石混凝土的耐磨性和抗硫酸鹽侵蝕性能，其最佳取代率為30%。 Abstract: To improve the mechanical properties and durability of coal gangue concrete, the effects of coal metakaolin on the compressive strength, splitting tensile strength, abrasion resistance and sulfate resistance of coal gangue concrete were studied by partially substituting cement with coal metakaolin. The results show that the incorporation of coal metakaolin can greatly improve the mechanical properties of coal gangue concrete. When the amount of coal metakaolin is 30%, the compressive strength and splitting tensile strength of coal gangue concrete reach the maximum value. In addition, the incorporation of coal metakaolin can effectively improve the abrasion resistance and sulfate resistance of coal gangue concrete, and the optimum content is 30%.?

王安輝，潘春宇，黃益平,等.煤系偏高嶺土對煤矸石混凝土性能的影響研究[J].混凝土與水泥制品,2021(10):25-28. WANG A H,PAN C Y,HUANG Y P,et al.Effect of Coal Metakaolin on Performance of Coal Gangue Concrete[J].China Concrete and Cement Products,2021(10):25-28.

混凝土表面防護涂層材料的研究進展

余茂林，鄧安仲，羅盛，陳虹合,孫皓

2021年第10期

摘要

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摘 ? 要：根據防護涂層對混凝土表面孔隙的封閉效果，將混凝土表面防護涂層分為表面成膜型、孔隙封閉型、疏水浸漬型3種，總結了各類型防護涂層的研究現狀、存在的問題，并對進一步研究方向進行了展望。 Abstract: According to the sealing effect of protective coating on concrete surface pores, concrete surface protective coating is classified into three types of surface film coating, pore blocking coating, hydrophobic impregnation coating. The research status and existing problems of various types of protective coatings are summarized, and further research directions are prospected.

余茂林,鄧安仲,羅盛,等.混凝土表面防護涂層材料的研究進展[J].混凝土與水泥制品,2021(10):29-34. YU M L,DENG A Z,LUO S,et al.Advances in Surface Protective Coating of Concrete[J].China Concrete and Cement Products,2021(10):29-34.

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