2021_2021_《混凝土與水泥制品》雜志社

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2021

復合摻合料對水泥膠砂流動度和長期強度的影響

蔣鶴1，李樹繁1，王小明1，高超2,3，周永祥2,3，周郅人2,3

2021年第1期

摘要

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摘 ? 要：采用粉煤灰（F）、礦渣粉（Sl）、硅灰（Si）和石灰石粉（L）復合組成5種復合礦物摻合料，研究了復合摻合料的組成和摻量對水泥膠砂流動度、長期抗壓強度和抗折強度的影響。結果表明：摻粉煤灰和石灰石粉的FSlL和FL復合摻合料流動性較好，流動度比達到110%以上；摻硅灰的FSlSi和SlSiL復合摻合料流動性較差，流動度比在80%左右；5種復合摻合料在30%、40%、50%摻量下，膠砂試件720 d抗壓強度和抗折強度均達到純水泥試件的110%~120%；FSlSi、FSl和FL復合摻合料隨著摻量的提高，長齡期膠砂抗壓強度有所增加，抗折強度發展趨勢與抗壓強度相同；SlL和SlSiL復合摻合料隨著摻量的提高，長齡期膠砂抗壓和抗折強度均略有下降。 Abstract: Five kinds of composite admixtures were composed of fly ash (F), slag powder (Sl), silica fume (Si) and limestone powder (L) in varying proportions. The effects of composition and content of composite admixtures on fluidity, long-term compressive strength and flexural strength of cement mortar were studied. The research results show that the flow properties of FSlL and FL composite admixtures that contain fly ash and limestone powder are superior, and the fluidity ratio is above 110%. The flow properties of FSlSi and SlSiL composite admixtures with silica fume are inferior, and the fluidity is about 80%. The compressive strength and flexural strength of 720 d mortar specimen with five kinds of composite admixtures are 110%~120% of those of pure cement specimen when the dosages of composite admixtures separately are 30%, 40% and 50%. With the increase of the content of FSlSi, FSl or FL, the long-term compressive strength of mortar increases, and the development trend of flexural strength is the same as that of compressive strength. As the increase of the content of SlL and SlSiL, the long-term compressive strength and flexural strength of mortar decrease slightly.

蔣鶴,李樹繁,王小明,等.復合摻合料對水泥膠砂流動度和長期強度的影響[J].混凝土與水泥制品,2021(1),1-6. JIANG H,LI S F,WANG X M,et al.Effect of Composite Admixtures on Fluidity and Long-term Strength of Cement Mortar[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(1):1-6.

混凝土塑性損傷模型參數的選取與驗證計算

張飛，馬建勛，南燕

2021年第1期

摘要

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摘 ? 要：基于塑性損傷的混凝土本構模型，現行規范與ABAQUS軟件給出的應力-應變關系表達式有所不同。在對兩種表達式進行分析對比的基礎上，對ABAQUS軟件自帶的混凝土塑性損傷模型（CDP模型）參數選取進行了分析，并給出了該模型參數的選取和調整方法。為了驗證模型參數選取的合理性和可靠性，采用ABAQUS軟件對算例試驗構件進行了有限元數值分析，并將數值分析所得的荷載-位移曲線與試驗測試曲線進行對比。結果表明：所選的參數能夠滿足數值分析的精度要求。 Abstract: For the concrete constitutive model based on the plastic damage, the stress-strain relationship expression in the current code is different from the expression given by ABAQUS software. Based on the analysis and comparison of the two expressions, the parameter selection in the CDP model of ABAQUS software was analyzed, and the selection and adjustment methods of the model parameters were given. In order to verify the rationality and reliability of model parameter selection, ABAQUS software was used to carry out a finite element numerical analysis on the example test members, and the load-displacement curve obtained from the numerical analysis was compared with the test curve. The results show that the parameters selection described can meet the accuracy requirements of numerical analysis.

張飛,馬建勛,南燕.混凝土塑性損傷模型參數的選取與驗證計算[J].混凝土與水泥制品,2021(1),7-11,29. ZHANG F,MA J X,NAN Y.Parameters Selection and Verification Calculation of Concrete Plastic Damage Model[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(1):7-11,29.

納米SiO2對不同孔隙率下透水混凝土性能的影響

張粉芹，申明昊，楊程鴻，陳越，許浩然

2021年第1期

摘要

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摘 ? 要：采用體積法設計孔隙率分別為15%、20%、25%的透水混凝土，研究了納米SiO2（NS）對透水混凝土抗壓強度、透水系數的影響規律?？偨Y了不同孔隙率下透水混凝土的破壞形式，并分析了破壞機理。結果表明：隨著NS摻量的增加，三種孔隙率下透水混凝土的抗壓強度均呈先增加后減少的趨勢，在NS摻量為1.0%時，抗壓強度都達到最大值；NS對透水混凝土7 d抗壓強度的提升效果比28 d更顯著；隨著孔隙率逐漸增大，NS對透水混凝土抗壓強度的改善效果逐漸增強，而對透水系數的提升效果逐漸減弱；從透水混凝土的破壞形式上來看，隨著孔隙率逐漸增大，摻入適量NS的透水混凝土，其骨料處斷裂的現象相較未摻NS時逐漸增多。 Abstract: The pervious concrete with porosity of 15%, 20% and 25% was designed by using the volume method, and the effect of nano-SiO2 (NS) on the compressive strength and hydrological permeability of pervious concrete under three porosities was studied. The failure modes and mechanism of pervious concrete under different porosities were summarized and analyzed. The research results show that with the increase of the NS content, the compressive strength of pervious concrete under the three porosities first increases and then decreases, and the compressive strength reaches the maximum when the NS content is 1.0%. The improvement effect of 7 d compressive strength of pervious concrete is more significant than that of 28 d. As the porosity gradually increases, the improvement effect of NS on compressive strength of pervious concrete gradually increases, but the effect of increasing the hydrological permeability gradually decreases. From the terms of the damage form, as the porosity gradually increases, the fracture phenomenon of the pervious concrete which mixed with an appropriate amount of NS will gradually increase than the case without NS. ?

張粉芹,申明昊,楊程鴻,等.納米SiO2對不同孔隙率下透水混凝土性能的影響[J].混凝土與水泥制品,2021(1),12-16. ZHANG F Q,SHEN M H,YANG C H,The Effect of Nano-SiO2 on Propereies of Pervious Concrete Under Different Porosities[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(1):12-16.

定形相變材料的制備及對混凝土耐高溫性能的影響

王永偉1，唐百曉2，王偉濤3

2021年第1期

摘要

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摘 ? 要：為了提高混凝土結構的耐高溫性能，從混凝土自身的儲熱性能出發，制備了一種定形相變材料，并研究了該相變材料對混凝土導熱性能和高溫后力學強度的影響。結果顯示：硫酸鋁銨摻量越高，相變材料的相變焓越大，當其摻量超過70%時，差示掃描量熱法（DSC）特征參數趨于穩定；定形相變材料具有較好的熱穩定性，且高溫下硫酸鋁銨和SiO2并未發生化學反應；相變材料的加入能提高混凝土的儲能密度，降低其導熱系數，混凝土內部的溫度隨相變材料摻量的增多而逐漸降低；當相變材料摻量小于6.5%時，相變材料的加入能明顯提高混凝土高溫后的強度，而當相變材料摻量大于6.5%時，再提高其摻量對混凝土耐高溫性能的改善作用有限。 Abstract: In order to improve the high temperature performance of concrete structure, a stationary phase transition material based on the heat storage properties of concrete was prepared, and the influence of phase transition material on thermal properties and mechanical strength after high temperature were studied. The results show that the higher the content of NH4Al(SO4)2·12H2O, the greater the phase transition enthalpy of the phase transition material. When the amount of admixture exceeds 70%, the DSC characteristic parameters tend to be stable. The stationary phase transition material has good thermal stability, and there is no chemical reaction between NH4Al(SO4)2·12H2O and SiO2 at high temperatures. The addition of phase transition materials can increase the energy storage density of concrete, and reduce its thermal conductivity. The temperature inside of the concrete gradually decreases with the increase of the amount of phase transition materials. When the amount of phase change material is less than 6.5%, the addition of phase change material can obviously increase the strength of the concrete after high temperature. When the amount of phase change material is greater than 6.5%, the effect of the amount of phase change material on the high temperature resistance of concrete is limited.

王永偉,唐百曉,王偉濤.定形相變材料的制備及對混凝土耐高溫性能的影響[J].混凝土與水泥制品,2021(1),17-20. WANG Y W,TANG B X,WANG W T.The Preparation of Stationary Phase Transition Materials and Its Effect on the High Temperature Resistance of Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(1):17-20.

PMMA聚合物復合混凝土的制備及機理研究

陳宇婷1,2，楊周1，李靜1，李耀環1，梁歡2

2021年第1期

摘要

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摘 ? 要：將有機聚合物單體與普通水泥通過常溫共聚的方法制備了一種新型復合混凝土，可以有效解決常見聚合物改性混凝土相容性差、過程復雜及成本高等問題。試驗結果表明：當水泥改性劑用量2.0 %、甲基丙烯酸甲酯摻量30 %時，混凝土的工作性、強度及抗滲性等綜合性能達到最優。另外，通過掃描電鏡、表面接觸角和紅外光譜分析等方法，研究了甲基丙烯酸甲酯與改性膠材互穿網絡式共聚機理。 Abstract: A new type of composite concrete was prepared by copolymerization of organic polymer monomer and ordinary cement at room temperature, which could effectively solve the problems of poor compatibility, complex process and high cost of common polymer modified concrete. The results show that when the dosage of cement modifier is 2.0%, the dosage of methyl methacrylate is 30%, and the comprehensive properties such as workability, strength and impermeability of the condensate are optimized. In addition, the IPN copolymerization mechanism of MMA and modified cementitious materials was studied by means of SEM, surface contact angle and infrared spectrum.

陳宇婷,楊周,李靜,等.PMMA聚合物復合混凝土的制備及機理研究[J].混凝土與水泥制品,2021(1),21-25. CHEN Y T,YANG Z,LI J,et al. Preparation and Mechanism Research of PMMA Polymer Composite Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(1):21-25.

相變儲能砂漿的制備和力學性能試驗研究

邊亞東1，王盟盟1，呂亞軍2，梁振1，王克儉1

2021年第1期

摘要

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摘 ? 要：以石蠟為相變材料，膨脹珍珠巖做支撐基體，制備了膨脹珍珠巖-石蠟復合相變材料，采用苯丙乳液對復合相變材料封裝，利用封裝后的復合相變材料替代部分細骨料制備了相變儲能砂漿，并對其力學性能進行了試驗研究。結果表明：苯丙乳液對復合相變材料有很好的封裝作用；隨著復合相變材料替代率的增大，相變儲能砂漿的力學性能下降；當復合相變材料替代率為70%時，相變儲能砂漿的抗壓強度為12.7 MPa，滿足規范中對建筑圍護結構砂漿的要求。研究成果可為相變材料在建筑中的應用提供參考。 Abstract： Using paraffin as the phase change material and expanded perlite as the support matrix, the expanded perlite-paraffin composite phase change material was prepared, and the composite phase change material was encapsulated with styrene-acrylic emulsion, and the encapsulated composite phase change material was used to replace part of the fine aggregate to prepare the phase change energy storage mortar, and the mechanical properties of the phase change energy storage mortar were tested. The results show that styrene-acrylic emulsion has a good encapsulation effect on the expanded perlite composite phase change material. As the replacement rate of composite phase change material increases, the mechanical properties of the phase change energy storage mortar decrease. When the replacement rate is 70%, the compressive strength of the phase change energy storage mortar is 12.7 MPa, which meets the requirements of the building envelope mortar in the code. The research results can provide references for the application of phase change materials in construction.

邊亞東,王盟盟,呂亞軍,等.相變儲能砂漿的制備和力學性能試驗研究[J].混凝土與水泥制品,2021(1),26-29. BIAN Y D,WANG M M,LYU Y J,et al.Experimental Study on Preparation and Mechanical Properties of Phase Change Energy Storage Mortar[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(1):26-29.

利用堿性電解水激發砂漿中礦粉活性的研究

李長江1，劉桂賓1，于琦1，李秋義2，王亮2

2021年第1期

摘要

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摘 ? 要：利用堿性電解水制備礦粉砂漿，研究了不同取代率礦粉對砂漿工作性和力學性能的影響，結合XRD分析，評價了利用堿性電解水激發礦粉的活性和改善礦粉砂漿性能的可行性。結果表明：堿性電解水礦粉砂漿的工作性和力學性能均優于自來水礦粉砂漿；當礦粉取代率為20%時，堿性電解水礦粉砂漿的28 d抗折強度和抗壓強度較自來水礦粉砂漿分別提高了11.9%和23.5%；堿性電解水礦粉砂漿中存在多鈣鉀石膏和鉀長石，且水化硅酸鈣和鋁酸鈣礦物的衍射峰顯著強于自來水礦粉砂漿。 Abstract: The alkaline electrolyzed water was used as mixing water to prepare slag powder mortar, and the effect of different replacement ratios of slag powder on the workability and mechanical properties of mortar were studied. ?Combined with XRD analysis, the feasibility of using alkaline electrolyzed water to stimulate the early activity of slag powder and improve the performance of slag powder mortar was evaluated. The results show that the workability and strengths of alkaline electrolyzed water slag powder mortar are both superior to those of tap water slag powder mortar. When the replacement ratio of slag powder is 20%, the 28 d flexural strength and compressive strength of alkaline electrolyzed water slag powder mortar are 11.9% and 23.5% higher than those of tap water slag powder mortar, respectively. Polycalcium potassium gypsum and potassium feldspar are found in alkaline electrolyzed water slag powder mortar, and the diffraction peaks of calcium silicate and calcium aluminate minerals are significantly stronger than those of tap water slag powder mortar.

李長江,劉桂賓,于琦,等.利用堿性電解水激發砂漿中礦粉活性的研究[J].混凝土與水泥制品,2021(1):30-33,47. LI C J,LIU G B,YU Q, Effect of Alkaline Electrolyzed Water on Activating Activity of Slag in Mortar[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(1):30-33,47.

養護條件對MgO膨脹劑膨脹性能的影響

周龍龍，王舜，苗苗，馮竟竟，李思琪，孫傳珍

2021年第1期

摘要

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摘 ? 要：對水養、水養轉干養和干濕循環養護條件下不同活性MgO膨脹劑（MEA）膨脹性能及水養條件下不同齡期膨脹凈漿微觀孔結構進行了研究。結果表明：MEA活性越高，其早期膨脹率增速越大，但后期膨脹率增速越慢；水養轉干養條件下，干空膨脹落差與MEA活性成正比；干濕循環養護條件下，高活性MgO的補償收縮效能高于低活性MgO。摻MEA漿體中大于50 nm孔隙的增加可能是砂漿產生膨脹的原因之一；28~180 d時，MEA主要細化的孔區間為20~200 nm。 Abstract: The expansion properties of different active MgO expansive agent (MEA) under the conditions of water curing, water curing to dry curing and dry and wet cycle curing and micro pore structure of different age expansive paste under water condition were studied. The results show that the higher the activity of MEA, the higher the early expansion rate, but the slower the later expansion rate. Under the condition of water curing to dry curing, dry air expansion drop is directly proportional to MEA activity. Under the condition of dry and wet cycle curing, the compensation contraction efficiency of high active MgO is higher than that of low active MgO. The addition of MEA promotes the increase of pores larger than 50 nm in the paste, which may be one of the reasons for the expansion of the mortar. At the age of 28 to 180 days, the main refining pores of MEA are between 20 nm and 200 nm.

周龍龍,王舜,苗苗,等.養護條件對MgO膨脹劑膨脹性能的影響[J].混凝土與水泥制品,2021(1):34-38 ZHOU L L,WANG S,MIAO M,et al.The Effect of Different Curing Conditions on the Expansive Properties of MgO Expansive Agent[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(1):34-38.

預制高性能混凝土（HPC）電纜溝的研制

鐘維軍1，金權1，王建民2，巴明芳2，樂亞光3，徐圣燁3

2021年第1期

摘要

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摘 ? 要：通過研究硅灰、Ⅰ級粉煤灰及S95礦渣粉摻量及摻入方式對高性能混凝土（HPC）的影響，確定了Ⅰ級粉煤灰和S95礦渣粉以1∶1復摻制備HPC預制裝配式電纜溝。針對不同服役條件，設計了預制HPC電纜溝U型截面形式，并對其承載力進行了試驗驗證。結果表明：預制HPC電纜溝的關鍵部位強度及變形均滿足承載力及變形要求，可為電纜溝的預制裝配化應用提供參考。 Abstract: According to the influence of silica fume, grade Ⅰ fly ash and S95 slag powder on the performance of high performance concrete (HPC), it is determined that the best mix proportion of grade Ⅰ fly ash and S95 slag powder is 1∶1. For different service conditions, the U-shaped section of HPC prefabricated cable trench is designed and prepared, and the bearing capacity is verified by simulation and test. The results show that the strength and deformation of key parts of HPC prefabricated cable trench can meet the requirements of bearing capacity and deformation, which can provide a reference for application of ?the prefabrication and assembly process of cable trench.

鐘維軍,金權,王建民,等.預制高性能混凝土（HPC）電纜溝的研制[J].混凝土與水泥制品,2021(1):39-43. ZHONG W J,JIN Q,WANG J M,et al.Development of Prefabricated Cable Trench with High Performance Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(1):39-43.

清水鏡面混凝土構件的生產工藝研究與應用

朱敏濤，周強，朱安標，金自清，王明牛

2021年第1期

摘要

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摘 ? 要：為研發清水鏡面混凝土構件的生產技術，詳細介紹了配合比設計、構件模具、飾面保護等技術，對比論證了不同制作工藝對清水鏡面混凝土構件飾面效果的影響，最終確定了清水鏡面混凝土構件的制作工藝，并結合實際工程案例進行了應用與驗證。 Abstract: In order to develop the production technology of fair-faced concrete components, the mix proportion design, component mold, facing protection and other technologies are introduced in detail, the influence of different production processes on the finish effect of fair-faced concrete components are compared and demonstrated, and finally the production process of fair-faced concrete components are determined, and the application and verification combined with practical engineering cases are carried out.

朱敏濤,周強,朱安標,等.清水鏡面混凝土構件的生產工藝研究與應用[J].混凝土與水泥制品,2021(1):44-47. ZHU M T,ZHOU Q,ZHU A B,et al.Research and Application of Production Technology on Specular Fair-faced Concrete Components[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(1):44-47.

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