第十一期_2018_《混凝土與水泥制品》雜志社

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第十一期

用預拌廠廢水制備C20~C60混凝土及工程應用

向佳瑜，李曦，蔣震，冷政，袁吉童

２０18年第11期

摘要

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摘要：分析了湖南區域三個混凝土預拌廠廢水的理化性質，采用該廢水制備了C20~C60混凝土來研究廢水對混凝土工作性能、力學性能和關鍵耐久性能的影響，并在相關指標滿足工程應用的要求后，將其應用于工程中。研究表明，三個預拌廠產生的廢水及其沉淀廢渣各項理化性質相似，成分接近，主要以SiO2、Al2O3和CaO為主。沉淀廢渣粒徑較小可以改善混凝土體系的顆粒級配；各強度等級的混凝土在廢水的最優摻量上存在差異，C30混凝土廢水摻量在50%表現出較為優異的工作性，且廢水對于中高強度等級混凝土的抗壓強度未發現不利的影響；廢水可降低混凝土的電通量和提高抗碳化性能，C60廢水混凝土6 h總電通量為300 C左右，碳化深度隨著廢水摻入量的增加而減少。 bstract: According to physical and chemical properties analysis of three concrete mixing stations in Hunan area, the C20~C60 concrete were prepared by adding waste water to study the effects of waste water on working performance, mechanical performance and critical durability of the concrete. The concrete was applied to engineering after relevant indicators met the requirements. The results show that physical and chemical properties of the waste water and sediment residue produced by the three mixing station are similar, and the main composition is SiO2, Al2O3 and CaO. The small particle size of sediment residue can improve the particle gradation of concrete. The concrete with different strength grade has different optimal content of waste water. The 50% waste water content of C30 concrete has excellent working performance, and waste water has no adverse effect on the compressive strength of medium and high strength grade concrete. Waste water can reduce concrete electric flux and improve carbonation resistance. The 6 h total electric flux of C60 concrete by waste water is about 300 C, and the carbonation depth decreases with the increase of the content of waste water.

再生骨料在透水混凝土中的應用研究

陳超1，石瑩2，祁廣廣1，陳琴3

２０18年第11期

摘要

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摘要：將廢棄混凝土破碎制備再生骨料應用于透水混凝土中，通過四因素三水平正交試驗研究了骨料粒徑、集灰比、水膠比、水泥用量四個因素對再生骨料透水混凝土性能的影響。結果表明，影響透水混凝土性能的因素依次為骨料粒徑＞水泥用量＞集灰比＞水膠比，水膠比在0.27~0.35范圍內對再生透水混凝土性能無顯著影響。選取正交試驗中強度和透水系數最高的兩組分別研究再生骨料摻量對透水混凝土性能影響，結果表明，再生骨料在透水混凝土中的摻量不宜超過50%。 Abstract: Recycled aggregate made by crushed deserted concrete was used to prepare pervious concrete. The orthogonal experiments of four factors and three levels was carried out to study influence of aggregate size，aggregate-binder ratio，water-binder ratio, cement content on the performance of pervious concrete. The results show that the contribution of factors which affect the performance of pervious concrete is aggregate size＞cement content＞aggregate-binder ratio＞water-binder ratio. The water-binder ratio has no significant effect on the performance of recycled pervious concrete in the range of 0.27~0.35. The two groups with the highest strength and permeability coefficient in the orthogonal test are selected to study the effects of recycled aggregate content on the performance of pervious concrete, result shows the content of recycled aggregate in pervious concrete should not exceed 50%.

高層泵送頂升施工鋼管混凝土配合比設計與應用

李彥昌

２０18年第11期

摘要

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摘要：通過高層泵送頂升施工鋼管混凝土配合比設計與應用，闡述了頂升混凝土配制關鍵技術，同時通過對頂升混凝土全面質量控制管理，取得了大量基礎數據，總結了頂升混凝土的質量控制要點，可為頂升混凝土配制和頂升施工過程質量控制提供參考。 Abstract: Through the mix ratio design and application of high-rise pumping lift-up construction concrete filled steel pipe, the key technologies of concrete for pumping lift-up construction are described. At the same time, through the comprehensive quality control process for the concrete, a large amount of basic data is obtained, and the quality control of jacked concrete is summarized. The main points can provide a reference for the quality control of pumping lift-up concrete preparation and construction proc

基于低場核磁共振研究摻加磷石膏對水泥硬化體孔結構的影響

王學兵1，王濤1，劉勁松2

２０18年第11期

摘要

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摘要：磷石膏是生產工業磷酸等的副產物，通常，磷石膏在水泥水化硬化中可起緩凝作用。本文基于低場核磁共振法這一無損檢測方法，研究磷石膏的摻入對水泥在水化硬化過程中引起的早期孔結構的變化。結果表明，隨著磷石膏的加入，水泥硬化體中的孔徑分布逐漸向較小尺寸的方向進行發展；水泥硬化體的最可幾半徑不僅隨養護齡期的增加而逐漸降低，隨磷石膏摻量的增加而逐漸增加?；诜中卫碚撗芯苛嗽谠撨^程中水泥硬化體的孔徑分布的變化，結果表明，其分形維數隨養護齡期的增加而逐漸降低，隨磷石膏摻量的增加而逐漸降低。 Abstract: Phosphogypsum is a by-product of the production of industrial phosphoric acid. Generally speaking, phosphogypsum plays a retardation role in hydration and hardening of cement. A new nondestructive testing method based on low field nuclear magnetic resonance (NMR) method was used to study the changes of pore structure in the early stage caused by the incorporation of phosphogypsum on cement in the process of hydration and hardening. The results show that with the addition of phosphogypsum, the pore size distribution of hardened cement gradually developed to a smaller size. The most probable radius of hardened cement paste decreases with the increase of curing age and increased with the increase of phosphogypsum content. Based on the fractal theory, the variation of the pore size distribution of the hardened cement paste in this process is studied. The results show that the fractal dimension decreased gradually with the increase of curing age, and gradually decreases with the increase of the amount of phosphogypsum.

立式徑向擠壓制管機成型頭結構和擠壓工藝參數優化

錢剛1，2，馮勇1，2，賈丙輝1，楊征宇1，韋文東1

２０18年第11期

摘要

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摘要：針對目前設計的立式徑向擠壓制管機成型頭，采用SolidWorks軟件建立不同拔模斜度的成型頭三維模型，運用Hypermesh軟件對各模型進行前處理，通過LS-Dyna計算各成型頭擠壓混凝土成型的力學行為，分析了拔模斜度對混凝土最大應力和應變的影響，擬合出了拔模斜度與混凝土最大應力、應變的關系曲線，確定混凝土成型效果最佳時，成型頭的拔模斜度為2.1 °。在此條件下，基于數值模擬和正交實驗，分析了成型頭上升速度、上擠壓輥順時針旋轉速度、下擠壓輥與抹光環逆時針旋轉速度對混凝土成型效果的影響，確定了最佳的工藝參數組合：成型頭上升速度為0.1 m/s，上擠壓輥順時針旋轉速度為60 r/min，下擠壓輥與抹光環逆時針旋轉速度為140 r/min。 Abstract：The molding head of vertical radial press concrete pipe machine was designed. The SolidWorks software is used to model the different draft angle molding heads, and the HyperMesh software is used to establish the finite element model of each molding head. The Ls-Dyna is used to calculate the mechanical behavior of molding head extruding the concrete to analyze the effect of draft angle on the stress and strain of concrete. From the fitted curve of draft angle and the stress and strain of concrete, the molding results of the concrete are the best when the draft angle of molding head is 2.1 °. Under this condition, based on the numerical simulation and orthogonal experiment, the effects of the rising speed of the molding head, the clockwise rotation speed of the upper roller and the counterclockwise rotation speed of the lower roller on the molding results of the concrete are analyzed. The best combination of process parameters is that the rising speed of the molding head is 0.1 m/s, the clockwise rotation speed of the upper roller is 60 r/min and the counterclockwise rotation speed of the lower roller is 140 r/min.

纖維素醚與脫硫石膏基自流平砂漿相容性試驗研究

吳金明1，唐凱靖2

２０18年第11期

摘要

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摘要：以流動度為控制指標，討論了纖維素醚摻量和分子量變化對脫硫石膏基自流平砂漿性能的影響，測試了纖維素醚對脫硫石膏水化熱的影響規律。試驗結果表明，纖維素醚摻量和分子量的增加，顯著增大了砂漿的黏度和保水性，同時，凝結時間延長，力學性能呈下降趨勢，相較而言，分子量的增加對砂漿宏觀性能的影響小于摻量的變化。在相同流動度時，纖維素醚摻量增加導致的用水量增加和體積密度的下降是砂漿力學性能下降的主要原因。 Abstract: The effect of the content and molecular weight of cellulose ether on the basic properties of desulphurized gypsum based self-leveling mortar was discussed, and the effect of cellulose ether on hydration heat of desulphurized gypsum was tested. The experimental results show that the increase of cellulose ether content and molecular weight significantly increases the viscosity and water retention of mortar. At the same time, the setting time is prolonged, and the mechanical properties of mortar decrease. The increase of molecular weight has less effect on the macroscopic properties of mortar than the change of content. At the same fluidity, the increase of water consumption and the decrease of volume density caused by the content of cellulose ether are the main reasons for the decrease of mechanical properties of the mortar.

HRB500鋼筋輕骨料混凝土偏心受壓構件二階效應計算研究

翁曉紅1，3，張程遠2，3，朱愛萍4，勞裕華2，3,肖志敏2，3

２０18年第11期

摘要

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摘要：按照我國混凝土規范和美國混凝土規范中偏心受壓構件二階效應的推導方法，分別推導了HRB500鋼筋輕骨料混凝土偏心受壓構件的二階效應計算公式。通過推得的公式分別計算考慮二階效應后HRB500鋼筋輕骨料混凝土偏心受壓構件的極限承載力，并且與試驗結果相對比。研究表明：兩種方法推得的二階效應計算公式各有優缺點，采用我國規范推得的公式所計算的承載力與試驗結果較為接近，采用美國規范推得的公式所計算的承載力僅在小偏心受壓構件范圍與試驗結果接近，建議HRB500鋼筋輕骨料混凝土偏心受壓構件的二階效應仍按普通混凝土規范的公式計算。 Abstract: According to the derivation method of Chinese concrete standard and American concrete standard, the design formulas about second-order effect on eccentrically compressed lightweight aggregate concrete(LWAC) members with HRB500 steel bar ware derived, the ultimate bearing capacity by the formula and comparing with the experimental results was calculated. The results show that both calculation methods have their advantages and disadvantages. The capacity calculated by the formula derived in Chinese concrete standard is similar to the experimental result, and the other derived in American concrete standard is similar to the experimental result of compression member with small eccentricity. The advised formula of second-order effect on eccentrically compressed lightweight aggregate concrete member with HRB500 steel bar is still as same as Chinese concrete standard.

劍麻纖維自密實輕骨料混凝土梁裂縫寬度試驗研究

董健苗，殷玲，馬發林，曹嘉威，王留陽

２０18年第11期

摘要

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摘要：通過對強度等級為C40的劍麻纖維自密實輕骨料混凝土梁進行抗彎性能試驗，研究了劍麻纖維的摻量和配筋率對自密實輕骨料混凝土梁的裂縫形態、裂縫間距和裂縫寬度的影響，通過最大裂縫寬度計算公式進行了理論分析。試驗結果表明，與未摻加纖維的混凝土試塊和試驗梁相比，劍麻纖維摻量為1 kg/m3、2 kg/m3和3 kg/m3時混凝土試塊的劈裂抗拉強度提高6.57%、23.87%、31.49%，試驗梁的開裂荷載提高了0、12.5%和35%；摻加劍麻纖維可有效限制裂縫的產生和發展，并改善裂縫形態，與未摻劍麻纖維的試驗梁相比，摻加1 kg/m3、2 kg/m3和3 kg/m3的劍麻纖維可使自密實輕骨料混凝土梁最大裂縫寬度減小5%、12%和27%。 Abstract: The bending performance of C40 self-compacting lightweight aggregate concrete beams with sisal fiber are tested, and the amount of sisal fiber and the ratio of reinforcement to the crack morphology and crack spacing of self-compacting lightweight aggregate concrete beams are investigated. And the effect of crack width is studied by the theoretical analysis of the maximum crack width calculation formula. The test results show that the splitting tensile strength of the test piece is increased by 6.57%, 23.87% and 31.49% when the sisal content is 1 kg/m3, 2 kg/m3 and 3 kg/m3, compared with the test piece without the fiber and the test beam. The cracking load of the test beam is increased by 0, 12.5% and 35%; the addition of sisal fiber can effectively limit the generation and development of cracks and improve the crack morphology, compared with the test beam without sisal fiber. The maximum crack width of self-compacting lightweight aggregate concrete beams can be reduced by 5%, 12%, and 27% for sisal fibers with contents of 1 kg/m3, 2 kg/m3 and 3 kg/m

玄武巖纖維再生混凝土硫酸鹽侵蝕后力學性能試驗研究

衛志盛1，袁書成2，董江峰2，王清遠2,3，趙洪林4

２０18年第11期

摘要

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摘要：針對工程中的硫酸鹽侵蝕和再生混凝土耐久性問題，利用玄武巖纖維的增強和耐腐蝕特性，對玄武巖纖維再生混凝土的抗硫酸鹽腐蝕性能進行研究，分析了不同再生骨料取代率和玄武巖纖維摻量對再生混凝土的抗硫酸鹽腐蝕性能的影響，對比分析了不同干濕循環次數后混凝土的抗壓強度、彈性模量和峰值應變變化情況，得到了再生混凝土硫酸鹽侵蝕后的破壞形式和力學參數。引入疊加效應系數K分析了再生混凝土荷載-位移全過程曲線及其破壞機理。結果表明，再生骨料取代率和玄武巖纖維摻量明顯影響受硫酸鹽侵蝕后混凝土的抗壓強度，但對彈性模量的影響較??；硫酸鹽侵蝕對混凝土界面過渡區造成的影響使得立方體試件和圓柱體試件的破壞模式差別較大。同時發現，摻入纖維可顯著提高再生混凝土峰值應變及變形能力，但對其彈性模量的提高影響較小。通過K值的引入和計算發現，摻入纖維和凍融循環次數的增加會降低纖維再生混凝土的抗硫酸鹽侵蝕性能。 Abstract: The effects of different recycled aggregate replacement rate and basalt fiber content on the sulfate resistance of recycled concrete were studied. The compressive strength, elastic modulus and peak strain of concrete after different dry - wet cycles were compared and analyzed, and the failure mode and mechanical parameters of the recycled concrete after sulfate attack were obtained. The coefficient K of combined effect was induced to characterize the superimposed effect of mixing basalt fiber and sulfate erosion. The results show that the recycled aggregate and basalt fiber content significantly affect the compressive strength of concrete after sulfate attack, but have little effect on elastic modulus. The effect of sulfate attack on concrete interface transition zone makes the failure modes of of cubic and cylinder test piece is quite different. At the same time, it was found that the incorporation of fiber can significantly improve the peak strain and deformation capacity of recycled concrete, but it has little effect on the improvement of elastic modulus. Through the introduction and calculation of the K value, it is found that the increase of fiber and freeze-thaw cycles reduce the sulfate attack resistance of recycled concrete.

PVA纖維增強普通混凝土復合梁彎曲性能試驗研究

徐鵬1，2，蘇駿1，蔡新華2

２０18年第11期

摘要

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摘要：為研究混凝土強度、復合梁黏結面處理方法和PVA纖維水泥基復合材料層厚度對PVA增強混凝土復合梁彎曲性能的影響，對十二組100 mm×100 mm×400 mm的復合梁試件進行了四點彎曲試驗,分析了試件破壞過程和彎曲性能。結果表明，與基體強度C30的普通混凝土梁相比，隨著PVA纖維水泥基復合材料層厚度的增加，復合梁的極限荷載提高了26.7%～48.4%；與基體強度C40的普通梁相比，隨著PVA纖維混凝土層厚度的增加，復合梁的極限荷載提高了15.7%～46.6%；隨著基體混凝土強度等級的提高，復合梁的極限承載力得到明顯提升；復合梁黏結面進行鑿毛處理對其極限荷載有所提高。 Abstract: To study the effect of concrete strength, composite beam bonded surface treatment method and PVA fiber cement based composite material layer thickness on the properties of PVA reinforced concrete composite beam bending, the twelve groups of 100 mm×100 mm×400 mm composite beam specimen through the four-point bending test of specimen failure process and bending properties were analyzed. The results show that the ultimate load of the composite beam increases by 26.7% to 48.4% with the increase of the thickness of the PVA fibre-cement composite material layer compared with the common concrete beam with the strength of the matrix C30. The ultimate load of composite beams increases by 15.7% to 46.6% with the increase of PVA fiber concrete layer thickness compared with that of ordinary beams with matrix strength C40. With the improvement of the strength grade of the matrix concrete, the ultimate bearing capacity of the composite beam has been improved obviously. The ultimate load of composite beam is increased by chipping.

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