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2021

磷石膏基復合材料的制備及性能研究

柏潔1，周華2，謝嘉驥3，文偉1，丁俊豪1，馮選輝1

2021年第12期

摘要

引用本文

摘 ? 要：以磷石膏、粉煤灰、礦渣微粉、生石灰為主要原料制備了磷石膏基復合材料，研究了磷石膏基復合材料性能的影響因素，并通過多變量數值分析得到了最優配合比。結果表明：當磷石膏、粉煤灰、礦渣微粉、生石灰的質量比為1∶0.4∶0.06∶0.03時，制備的磷石膏基復合材料的抗壓、抗折強度均較高；摻入6‰防水劑對磷石膏基復合材料的抗壓強度提升較大，復摻3‰減水劑+3‰防水劑對抗折強度提升較大；當水膠比為0.38~0.40時，磷石膏基復合材料的強度較高；21 ℃蒸汽養護14 d可使磷石膏基復合材料的強度達到最佳，但蒸汽養護會導致磷石膏基復合材料的吸水率增大、軟化系數降低；通過數值分析建立的多變量磷石膏基復合材料的強度計算公式，可以得出單一變量下磷石膏基復合材料的強度值和多變量下磷石膏基復合材料的強度值與對應原材料摻量之間的關系。 Abstract: The phosphogypsum-based composites were prepared with phosphogypsum, fly ash, slag powder and quicklime as main raw materials. The factors affecting the performance of phosphogypsum-based composites were studied, and the optimal mix proportion was obtained through multivariate numerical analysis. The results show that when the mass ratio of phosphogypsum, fly ash, slag powder, and quicklime is 1∶0.4∶0.06∶0.03, the compressive and flexural strengths of the prepared phosphogypsum-based composite materials are higher. The compressive strength of phosphogypsum-based composites is greatly improved by adding 6‰ water-repellent agent, and the flexural strength of phosphogypsum-based composites is greatly improved by adding 3‰ water-reducing agent + 3‰ water-repellent agent. When the water-binder ratio is 0.38~0.40, the strength of phosphogypsum-based composites is higher. Steam curing at 21 ℃ for 14 days can optimize the strength of phosphogypsum-based composites, but steam curing will increase the water absorption and decrease the softening coefficient of phosphogypsum-based composites. Through the strength calculation formula of multivariable phosphogypsum-based composites established by numerical analysis, the relationship between the strength value of phosphogypsum-based composites under single variable and the strength value of phosphogypsum-based composites under multivariable and the corresponding raw material content can be obtained.

柏潔,周華,謝嘉驥,等.磷石膏基復合材料的制備及性能研究[J].混凝土與水泥制品,2021(12):94-99. BAI J,ZHOU H,XIE J J,et al.Study on the Preparation and Performance of Phosphogypsum-based Composites[J].China Concrete and Cement Products,2021(12):94-99.

再生粗骨料品質和摻量對再生混凝土力學性能的影響

陳旭勇，劉榴，程書凱，屠艷平，肖雪皓

2021年第12期

摘要

引用本文

摘 ? 要：采用兩種再生粗骨料（RAⅠ、RAⅡ）分別替代30%、50%、70%、100%的天然粗骨料，以及將兩種再生粗骨料以不同質量比（mRAⅠ∶mRAⅡ=1∶3、1∶1、3∶1）混合后替代30%、50%、70%、100%的天然粗骨料制備了再生混凝土，研究了不同再生粗骨料的品質和摻量對再生混凝土抗壓強度、劈裂抗拉強度和軸心抗壓強度的影響。結果表明：再生混凝土的抗壓強度、劈裂抗拉強度和軸心抗壓強度均隨著再生粗骨料摻量的增加而降低；當再生粗骨料摻量一定時，再生混凝土的力學強度隨著mRAⅠ∶mRAⅡ的增大而增大；參考GB 50010—2010《混凝土結構設計規范》建立的再生混凝土軸心抗壓強度與立方體抗壓強度關系式的擬合效果較好。 Abstract: Recycled concrete was prepared by using two kinds of recycled coarse aggregate(RAⅠ, RAⅡ) to replace 0, 30%, 50%, 70% and 100% natural coarse aggregate respectively, and using mixed recycled coarse aggregate (mRAⅠ∶mRAⅡ=1∶3, 1∶1, 3∶1) to replace 0, 30%, 50%, 70% and 100% natural coarse aggregate. The effects of different quality and content of recycled coarse aggregate on the compressive strength, splitting tensile strength and axial compressive strength of recycled concrete were studied. The results show that the compressive strength, splitting tensile strength and axial compressive strength of recycled concrete decrease with the increase of recycled coarse aggregate content. When the content of recycled coarse aggregate is constant, the mechanical properties of recycled concrete increase with the increase of mRAⅠ∶mRAⅡ. The relationship between the axial compressive strength and the cubic compressive strength of recycled concrete established by referring to GB 50010—2010 Code for Design of Concrete Structures has a good fitting effect.

陳旭勇,劉榴,程書凱,等.再生粗骨料品質和摻量對再生混凝土力學性能的影響[J].混凝土與水泥制品,2021(12):89-93. CHEN X Y,LIU L,CHENG S K,et al.Effect of Recycled Coarse Aggregate Quality and Content on Mechanical Properties of Recycled Concrete[J].China Concrete and Cement Products,2021(12):89-93.

基于正交試驗的機制砂自密實輕骨料混凝土配合比設計

張淑云，周杰，張政，秦卿

2021年第12期

摘要

引用本文

摘 ? 要：采用固定砂石體積法和改進的全計算法，設計了C40機制砂自密實輕骨料混凝土的配合比，并通過正交試驗分析了機制砂自密實輕骨料混凝土的抗壓強度和工作性。結果表明：當水膠比為0.37、體積砂率為51%、Ⅰ級粉煤灰替代率為20%、硅灰替代率為4%、聚羧酸高性能減水劑摻量為1%時，能夠滿足C40機制砂自密實輕骨料混凝土的相關性能要求。 Abstract: Using the fixed gravel volume method and the improved total calculation algorithm, the mix proportion of C40 machine-made sand self-compacting lightweight aggregate concrete was designed, and the compressive strength and workability of machine-made sand self-compacting lightweight aggregate concrete were analyzed through orthogonal test. The results show that when the water-binder ratio is 0.37, the volume sand ratio is 51%, the substitution rate of grade Ⅰ fly ash is 20%, the substitution rate of silica fume is 4%, and the content of polycarboxylic acid high-performance water-reducing agent is 1%, C40 machine-made sand self-compacting lightweight aggregate concrete can meet the relevant performance requirements.

張淑云,周杰,張政,等.基于正交試驗的機制砂自密實輕骨料混凝土配合比設計[J].混凝土與水泥制品,2021(12):84-88,93. ZHANG S Y,ZHOU J,ZHANG Z,et al.Mix Proportion Design of Machine-made Sand Self-compacting Lightweight Aggregate Concrete Based on Orthogonal Test[J].China Concrete and Cement Products,2021(12):84-88,93.

煤矸石活性激發及其膠砂力學性能試驗研究

丁莎1,2，陳霽溪3，關虓2,3

2021年第12期

摘要

引用本文

摘 ? 要：以煤矸石為原料，利用機械球磨法粉碎煤矸石，并將其與不同的化學激發劑混合，制得了活性不一的煤矸石粉。通過正交試驗，研究了煤矸石粉摻量、化學激發劑種類和摻量對煤矸石膠砂抗壓強度的影響，利用X射線衍射（XRD）和掃描電鏡（SEM）分析了煤矸石粉的礦物組成和微觀形貌。結果表明：機械球磨破壞了煤矸石的層狀結構，提高了其表面活性；以10%摻量的煤矸石粉等質量替代水泥，并摻入2%的Ca(OH)2激發劑，可加快煤矸石粉的二次水化，對應膠砂試件的抗壓強度達到最大。 Abstract: Coal gangue powder with different activity was prepared by mechanical ball milling and mixing with different chemical activators. Through orthogonal test, the influence of coal gangue powder content, chemical activator type and content on the compressive strength of coal gangue mortar was studied, and the mineral composition and micro morphology of coal gangue powder were analyzed by X-ray diffraction(XRD) and scanning electron microscope(SEM). The results show that mechanical ball milling destroys the layered structure of coal gangue and improves its surface activity. By replacing cement with 10% coal gangue powder and adding 2% Ca(OH)2 activator, the secondary hydration of coal gangue powder can be accelerated, and the compressive strength of corresponding mortar specimen can reach the maximum.

丁莎,陳霽溪,關虓.煤矸石活性激發及其膠砂力學性能試驗研究[J].混凝土與水泥制品,2021(12):79-83. DING S,CHEN J X,GUAN X.Experimental Study on Active Excitation of Coal Gangue and Mechanical Properties of Mortar[J].China Concrete and Cement Products,2021(12):79-83.

裝配式整體輕質內隔墻在建筑工業化中的研究與應用

王鐵柱，楊飛華，趙煒璇，高志杰

2012年第12期

摘要

引用本文

摘 ? 要：傳統內隔墻通過塊材砌筑，以加氣條板、空心板、輕鋼龍骨為主，多采用人工安裝，施工效率較低，且后期存在裂縫等質量問題。結合具體工程案例，以建筑工業化為方向，采用新型立模、輕質混凝土技術，進行了整體輕質內隔墻的研制和應用，實現了產品尺寸定制化和流水線生產，同時，在工廠內預埋管線，實現了現場機械化安裝、與梁板柱同步施工，不僅提高了施工效率，而且有效解決了傳統內隔墻存在的裂縫等質量問題，且研制的裝配式整體輕質內隔墻的隔聲性能優于傳統內隔墻。 Abstract: The traditional internal partition wall is built by block materials, mainly with aerated slats, hollow slabs, and light steel keels, and manual installation is the main method. The construction efficiency is low, and there are quality problems such as cracks in the later stage. Combined with specific engineering cases, taking the construction industrialization as the direction, adopting new vertical form and lightweight concrete technology, the overall lightweight internal partition wall is developed and applied, and the product size customization and assembly line production are realized. At the same time, the pipelines are embedded in the factory to realize on-site mechanized installation and synchronous construction with beams, plates and columns, which not only greatly improves the construction efficiency, but also fundamentally solves the quality problems such as cracks existing in the traditional internal partition wall, and the sound insulation performance of the prefabricated integral lightweight internal partition wall is better than that of the traditional internal partition wall.

王鐵柱,楊飛華,趙煒璇,等.裝配式整體輕質內隔墻在建筑工業化中的研究與應用[J].混凝土與水泥制品,2021(12):75-78,83. WANG T Z,YANG F H,ZHAO W X,et al.Research and Application of Prefabricated Integral Lightweight Internal Partition Wall in Building Industrialization[J].China Concrete and Cement Products,2021(12):75-78,83.

壓-扭作用下中空夾層鋼管混凝土的破壞機理分析

廖栩，李吉人，王慶利

2021年第12期

摘要

引用本文

摘 ? 要：為了分析中空夾層鋼管混凝土在壓-扭復合受力下的破壞機理，對24根中空夾層鋼管混凝土進行了壓-扭靜力試驗，分析了受力全過程中中截面應變的開展規律及軸力對扭轉剛度的影響，并通過扭轉變形各階段中截面橫向應變與剪應變的開展，分析了軸力對外鋼管約束效應的影響。結果表明：軸壓比較大時，扭矩-轉角（T-θ）曲線在彈性范圍內出現明顯的拐點，軸力提高了初始抗扭剛度；圓中空夾層鋼管混凝土中截面不同位置處的扭矩-應變（T-ε）曲線重合度較高，相較于方形截面，其對內部結構的約束更均勻；扭矩加載初期，方形截面外鋼管角部與中部的環向應變及剪應變相近，加載后期，中部的剪應變大于角部，角部的環向應變大于中部，表明角部出現應力集中，對內部結構的約束效應更明顯，同時受力全過程中角部的相互作用力均大于中部。 Abstract: In order to analyze the failure mechanism of the concrete filled double skin steel tube(CFDST) under compression and torsion, the compression-torsion static test was carried out on 24 pieces of concrete filled double skin steel tubes. The strain development of the middle section during the whole process and the effect of the axial force on the torsional stiffness were analyzed. Through the development of hoop strain and shear strain of middle section in each stage of torsional deformation, the influence of axial force on restraint effect of the outer steel tube was analyzed. The results show that when the axial compression ratio is relatively large, the T-θ curve has an obvious inflection point in the elastic stage, and the axial force increases the initial torsional stiffness. The circular CFDST has a higher degree of coincidence of the T-ε curves at different positions of the middle section, and compared with the square outer tube, it has a more uniform restraint effect on the internal structure. At the beginning of torque loading, the hoop strain and shear strain at the corner of the outer steel tube with square cross-section are similar to the middle. At the later stage of torque loading, the shear strain in the middle is greater than that in the corner, but the hoop strain in the corner is greater than that in the middle, which shows that there is stress concentration in the corner, and the restraint effect on the internal structure is obvious. At the same time, the interaction force of the corner is greater than that of the middle during the whole process.

廖栩,李吉人,王慶利.壓-扭作用下中空夾層鋼管混凝土的破壞機理分析[J].混凝土與水泥制品,2021(12):67-74. LIAO X,LI J R,WANG Q L.Analysis of the Failure Mechanism of Concrete Filled Double Skin Steel Tube Under Compression-torsion[J].China Concrete and Cement Products,2021(12):67-74.

新型PKG疊合板抗彎性能試驗研究及有限元分析

金鴻鑫，陸琨，陶忠，房強，何穎成

2021年第12期

摘要

引用本文

摘 ? 要：對矩形肋疊合板構件和T形肋疊合板構件進行了均布加載試驗，研究了各構件在受力過程中剛度、跨中撓度和裂縫的變化規律，對比分析了各部件的荷載-應變曲線，并得到了構件的開裂荷載和極限承載力。結果表明：疊合板件的力學性能受底板肋部形式的影響較大；相同跨度下，T形肋疊合板件的受力性能優于矩形肋疊合板件；兩種肋形式的疊合板件均為受彎破壞，延性良好。T形肋預制底板的有限元分析結果表明，增加T形肋的腹板高度可明顯提高構件的抗彎承載力；構件肋孔間的混凝土出現水平方向的貫通裂縫，表明肋孔間混凝土的破壞形式主要為剪切型破壞。 Abstract: Uniform loading tests were carried out on rectangular rib and T-shaped rib composite plates respectively, and the variation laws of stiffness, mid span deflection and cracks of each component during the loading process were studied, and the load-strain curves of each component were compared and analyzed, and the cracking load and ultimate bearing capacity of the component were obtained. The results show that the mechanical properties of the composite plates are greatly affected by the rib form of the bottom plate. Under the same span, the mechanical performance of T-shaped rib is better than that of rectangular rib. The composite plates with two kinds of ribs are flexural failure and have good ductility. The finite element analysis results of T-shaped rib precast floor show that increasing the web height of T-shaped rib can significantly improve the flexural capacity of the component. Horizontal through cracks appear in the concrete between the rib holes, which indicates that the failure mode of the concrete between the rib holes is mainly shear failure.

金鴻鑫,陸琨,陶忠,等.新型PKG疊合板抗彎性能試驗研究及有限元分析[J].混凝土與水泥制品,2021(12):59-66,74. JIN H X,LU K,TAO Z,et al.Experimental Study and Finite Element Analysis on Bending Properties of New PKG Composite Plates[J].China Concrete and Cement Products,2021(12):59-66,74.

礦物摻合料和纖維復摻對混凝土力學性能的影響研究

惠存，王森林，李克，陶宏利，邱軒，邊亞東

2021年第12期

摘要

引用本文

摘 ? 要：通過正交試驗研究了粉煤灰、硅灰和玄武巖纖維對混凝土力學性能的影響，結合SPSS軟件對試驗數據進行了統計分析，運用極差分析方法得到了各因素對混凝土力學性能影響的主次順序。結果表明：隨著粉煤灰摻量的增加，混凝土各齡期的力學性能呈下降趨勢；隨著硅灰摻量的增加，混凝土各齡期的力學性能呈上升趨勢；隨著玄武巖纖維摻量的增加，混凝土的抗壓強度基本不變，劈裂抗拉強度得到一定提升；當粉煤灰摻量為10%、硅灰摻量為6%、玄武巖纖維摻量為0.45%時，混凝土各齡期的抗壓強度和劈裂抗拉強度均最高。 Abstract: The effects of fly ash, silica fume and basalt fiber on the mechanical properties of concrete were studied by orthogonal test, and the test datas were statistically analyzed by SPSS software, and the primary and secondary order of the influence of various factors on the mechanical properties of concrete was obtained by using the range analysis method. The results show that the mechanical properties of concrete at each age decrease with the increase of fly ash content. With the increase of silica fume content, the mechanical properties of concrete at each age show an upward trend. With the increase of basalt fiber content, the compressive strength of concrete is basically unchanged, and the splitting tensile strength is improved to a certain extent. When the fly ash content is 10%, silica fume content is 6% and basalt fiber content is 0.45%, the compressive strength and splitting tensile strength of concrete at each age are the highest.

惠存,王森林,李克,等.礦物摻合料和纖維復摻對混凝土力學性能的影響研究[J].混凝土與水泥制品,2021(12):55-58. HUI C,WANG S?L,LI K,et al.Influence of Mineral Admixture and Fiber on the Mechanical Properties?of Concrete[J].China Concrete and Cement Products,2021(12):55-58

不同因素對超高性能混凝土工作性及力學性能的影響

王冠1，李煒1，葛文杰1,2，陳玉彬2,3，孫浩1，陳博洋1，陳亦文1，王碧濤1

2021年第12期

摘要

引用本文

摘 ? 要：研究了水膠比和礦物摻合料摻量對超高性能混凝土（UHPC）工作性的影響，分析了砂種類對UHPC力學性能的影響。結果表明：增大水膠比、礦渣粉摻量、粉煤灰摻量均可改善UHPC的工作性，而增大硅灰摻量會降低UHPC的工作性；摻入1%的鋼纖維可顯著提高UHPC的力學性能；海砂、江砂取代石英砂會使UHPC的抗壓強度和抗折強度均有不同程度的降低，機制砂取代石英砂會使UHPC的抗壓強度增加、抗折強度降低。 Abstract: The influence of water binder ratio and mineral admixtures content on the working performance of ultra-high performance concrete(UHPC) was studied, and the influence of sand type on the mechanical properties of UHPC was analyzed. The results show that increasing the water binder ratio, slag powder content and fly ash content can improve the working performance of UHPC, but increasing silica fume content can reduce the working performance of UHPC. Adding 1% steel fiber can significantly improve the mechanical properties of UHPC. Replacing quartz sand with sea sand and river sand can reduce the compressive strength and flexural strength of UHPC to varying degrees. Replacing quartz sand with machine-made sand can increase the compressive strength and reduce the flexural strength of UHPC.

王冠,李煒,葛文杰,等.不同因素對超高性能混凝土工作性及力學性能的影響[J].混凝土與水泥制品,2021(12):50-54. WANG G,LI W,GE W J,et al.Influence of Different Factors on the Workability and Mechanical Properties of Ultra-high Performance Concrete[J].China Concrete and Cement Products,2021(12):50-54.

玄武巖纖維對3D打印再生水泥基材料性能的影響研究

余盈，李犇，許亮軍，鄧宇軒，馬瑤娜，謝詠菲

2021年第12期

摘要

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摘 ? 要：研究了不同摻量的玄武巖纖維對3D打印再生水泥基材料工作性與力學性能的影響。結果表明：當玄武巖纖維摻量為0.3%~0.5%時，可滿足3D打印所需的流動性、可擠出性、可建造性、凝結時間等要求，且所制備的3D打印再生水泥基材料的抗壓與抗折性能均較好。 Abstract: The effects of different contents of basalt fiber on the workability and mechanical properties of 3D printed recycled cement-based materials were studied. The results show that when the content of basalt fiber is 0.3%~0.5%, it can meet the requirements of fluidity, extrudability, constructability and setting time for 3D printing, and the compressive and flexural properties of the prepared 3D printed recycled cement-based materials are good.

余盈,李犇,許亮軍,等.玄武巖纖維對3D打印再生水泥基材料性能的影響研究[J].混凝土與水泥制品,2021(12):45-49. YU Y,LI B,XU L J,et al.DENG Yu-xuan,Research on the Influence of Basalt Fiber on the Properties of 3D Printed Recycled Cement-based Materials[J].China Concrete and Cement Products,2021(12):45-49.

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