混凝土研究_2020_《混凝土與水泥制品》雜志社

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混凝土研究

混凝土早強性能研究進展和展望

丁斌1，歐陽利軍2，房鈺柯2

2020年第9期

摘要

引用本文

摘 ? 要：基于國內外的研究成果，將早強型混凝土的制備方法分為摻早強劑、使用特種水泥和摻高分子聚合物三種。分別歸納總結了這三種方法對混凝土早強性能的影響，并簡要分析了各制備方法所存在的問題。此外，介紹了目前提高超高性能混凝土（UHPC）早強性能的方法，并對其未來的研究方向進行了展望。 Abstract: Based on the research results at home and abroad, the preparation methods of early-strength concrete are divided into three types: early strength admixtures, special cement-based materials and high-molecular polymer. The effects of these three methods on the early strength of concrete are summarized. The problems of each preparation method are briefly analyzed. In addition, the current method of ultra-high performance concrete (UHPC) to improve the early strength performance is introduced, and its future research directions are prospected.

丁斌,歐陽利軍,房鈺柯.混凝土早強性能研究進展和展望[J].混凝土與水泥制品,2020(9):24-29. DING B,OUYANG L J,FANG Y K.Review and Prospect of Early Strength Performance of Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(9):24-29.

礦物摻合料對水泥基材料抗侵蝕性能的影響

裘智輝1,2，渠亞男1,2，仲新華1,2，李連吉1,2，孔慶欣1,2，蘇婉玉1,2

2020年第9期

摘要

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摘 ? 要：研究了石灰石粉、硅灰-石灰石粉、硅灰-粉煤灰、硅灰-礦渣粉和納米Al2O3、納米Fe2O3對全浸泡水泥基膠砂抵抗硫酸鹽和氯鹽復合溶液侵蝕性能的影響，探討了不同組成水泥基材料增強抗侵蝕性的可行性。測試了水泥基膠砂的外觀形貌、強度，并利用XRD分析了侵蝕試樣的物相組成。結果表明，硅灰-礦渣粉增強水泥基材料的抗侵蝕性能較好。 Abstract: The effects of limestone powder, silica ash-limestone powder, silica ash-slag powder nano-Al2O3 and nano-Fe2O3 on the resistance of full-soaked mortar to the erosion of sulfate and chlorine-salt composite solutions were studied. The feasibility of enhancing the resistance of mortar to corrosion of different composed cement-based materials was discussed. The appearance and strength loss of the mortar were tested to characterize the degree of damage to the test piece, and the object composition of the erosion sample was analyzed by X-ray diffraction instrument. The results show that it is feasible to enhance the resistance of mortar with silicon ash-slag powder.

裘智輝,渠亞男,仲新華,等.礦物摻合料對水泥基材料抗侵蝕性能的影響[J].混凝土與水泥制品,2020(9):20-23,29. QIU Z H,QU Y N,ZHONG X H,et al.Study on Effect of Mineral Doping on Anti-erosion Properties of Cement-based Materials[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(9):20-23,29.

濕噴混凝土配合比優化的研究及應用

嚴少洋1,2，閆松3，劉永勝4

2020年第9期

摘要

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摘 ? 要：針對某金礦破碎、易風化的圍巖支護難度大等特點，采用濕噴混凝土技術實施機械化施工。研究了水泥摻量、纖維摻量、水灰比及砂率對濕噴混凝土可泵性及強度的影響。并通過正交試驗方法，討論了摻合料對濕噴混凝土坍落度、擴展度、抗壓與抗折強度的影響規律。結果表明：增加水灰比能顯著提高濕噴混凝土的坍落度，纖維用量增大對強度變化不明顯但其對擴展度影響較大；砂率增大雖然能夠增大混凝土的流動性但是強度呈下降趨勢；通過極差分析結果得出了影響混凝土強度的顯著因素及最優配合比，該配合比成功應用于實際工程。 Abstract: Aiming at the characteristics of crushing and weathering surrounding rock which was difficult to support of a gold mine, the wet shotcreting technology was applied to carry out mechanized construction. The effects of cement content, fiber content, water-cement ratio and sand ratio on the pump ability and strength of wet shotcrete as well as the effects of admixture on slump, extension, compression strength and flexural strength of wet shotcrete were studied by orthogonal test. The results show that the slump of wet shotcrete can be significantly increased by increasing the water-cement ratio, and the increase of fiber content has no obvious effect on the strength but has a great influence on extension. Although the increase of sand ratio can increase the fluidity of concrete, it shows a downward trend to the strength. Through range analysis, the significant factors affecting the strength of concrete and the optimal mix proportion are obtained. The mix proportion has been successfully applied to practical engineering.

嚴少洋,閆松,劉永勝.濕噴混凝土配合比優化的研究及應用[J].混凝土與水泥制品,2020(9):16-19. YAN SY,YAN S,LIU Y S.Research on Mix Proportion Optimization of Wet Shotcrete and Application[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(9):16-19.

氣凝膠-水泥復合多孔材料的孔結構與硬化性能

路玨1,2，蔣俊1，盧忠遠1，李軍1

2020年第9期

摘要

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摘 ? 要：采用體積取代法將氣凝膠漿料引入水泥基體中，制備了氣凝膠-水泥復合多孔材料（ACPC），結合壓汞（MIP）、氮吸附（NAD）和掃描電子顯微鏡（SEM）對ACPC孔結構和微觀形貌進行表征，研究了ACPC的孔結構和硬化性能。試驗結果表明，當氣凝膠漿料取代量由0 增加到66%時，材料孔隙率從23.0%上升至78.1%，平均孔徑從45.3 nm增加至198.3 nm。氣凝膠的引入可以細化孔結構，材料介孔孔容由0.03 mL/g增加到0.20 mL/g，孔結構得到改善。在水泥漿體中引入氣凝膠漿料，可以得到干密度為365~1 262 kg/m3、抗壓強度為0.8~24.1 MPa、導熱系數為0.066~0.364 W/（m·K）的ACPC。 Abstract: Aerogel slurry was introduced into cement system to prepare aerogel-cement porous composites (ACPC) by volume substitution method. MIP, NAD and SEM were used to characterizate the pore structure and morphology of ACPC. The pore structure and hardened properties of ACPC were investigated. The results show that the porosity of ACPC increases from 23% to 78.1% and the average pore diameter of ACPC increases from 45.3 nm to 198.3 nm with the increasing aerogel slurry replacement from 0 to 66 %. The aerogel slurry can refine voids, and the mesoporous volume increases from 0.03 mL/g to 0.20 mL/g. Adding aerogel slurry into cement paste can get ACPC with a dry density, compressive strength and thermal conductivity of 365~1 262 kg/m3, 0.8~24.1 MPa, and 0.066~0.364 W/(m·K), respectively. ?

路玨,蔣俊,盧忠遠,等.氣凝膠-水泥復合多孔材料的孔結構與硬化性能[J].混凝土與水泥制品,2020(9):11-15. LU J,JIANG J,LU Z Y,et al.Study on Pore Structure Characterization and Hardened Properties of Aerogel-Cement Porous Composites[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(9):11-15.

3D打印混凝土相關性能研究進展

段嚴，秦先濤

2020年第9期

摘要

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摘 ? 要：從流動性、黏結強度、凝結時間、纖維增強等方面概括了目前3D打印混凝土的研究進展，分析了外加劑、骨料級配和特殊材料應用于改善3D打印混凝土流動性的現狀；總結了3D打印混凝土層間黏結強度的不足及改善措施；從外加劑和水泥的選擇上探討了3D打印混凝土凝結時間的控制方案，分析了纖維用于3D打印混凝土中的優勢以及特殊性；結合現狀對3D打印混凝土未來研究方向進行了展望。 Abstract: The research progress of 3D printed concrete (3DPC) from fluidity, bond strength, setting time and fiber reinforcement is summarized. Specifically, the fluidity of 3DPC is analyzed based on the additive, gradation and special materials. While the weaknesses of bond strength of 3DPC and improvement measures are summarized. Then, the control scheme for the setting time is researched from the point of additive and cement. Meanwhile, the advantage and particularity of the use of fiber in 3DPC are analyzed. At last, the future research directions of 3DPC are proposed for promoting the development of 3DPC.

段嚴,秦先濤.3D打印混凝土相關性能研究進展[J].混凝土與水泥制品,2020(9):5-10. DUAN Y,QIN X T.Research Progress on the Properties of 3D Printed Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(9):5-10.

超高性能混凝土（UHPC）在裝配式建筑中的應用及質量控制指標

樊俊江，於林鋒

2020年第9期

摘要

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摘 ? 要：分析了兩類超高性能混凝土（UHPC）在裝配式建筑中的應用前景與相應的質量指標體系。結果表明：結構類超高性能混凝土可用于裝配式漿錨搭接與裝配式預制構件中，建議其抗壓強度不低于120 MPa、抗彎強度不低于14 MPa、抗拉強度不低于7 MPa；裝飾類超高性能混凝土可用于裝配式建筑外墻裝飾，建議其抗壓強度不低于100 MPa、抗彎強度不低于10 MPa、抗拉強度不低于5 MPa；裝配式建筑用超高性能混凝土的28 d干縮不宜大于300 με，3 d自收縮不大于800 με，28 d氯離子擴散系數不宜大于0.30×10-12 m2/s。 Abstract: The application prospect and corresponding quality index system of two kinds of ultra-high performance concrete（UHPC） in prefabricated buildings were analyzed. The results show that the structural ultra-high performance concrete can be used in the assembly type of slurry anchor lap and assembly type of prefabricated components, and its compressive strength is not less than 120 MPa, bending strength is not less than 14 MPa, and tensile strength is not less than 7 MPa. Decorative ultra-high performance concrete can be used for decoration of exterior wall of prefabricated building. It is suggested that its compressive strength should not be less than 100 MPa, bending strength should not be less than 10 MPa and tensile strength should not be less than 5 MPa. The 28 d dry shrinkage of UHPC for prefabricated building should not be greater than 300 με, the 3 d self shrinkage should not be greater than 800 με, and the 28 d chloride diffusion coefficient should not be greater than 0.30×10-12 m2/s.

樊俊江,於林鋒.超高性能混凝土（UHPC）在裝配式建筑中的應用及質量控制指標[J].混凝土與水泥制品,2020(9):1-4. FAN J J,YU L F.Analysis of Application of Ultra-high Performance Concrete in Prefabricated Building and Its Quality Control Index[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(9):1-4.

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