混凝土研究_2022_《混凝土與水泥制品》雜志社

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混凝土研究

磷酸鎂水泥在工程結構中的修復加固研究進展

胡玥1,2,3，鄭淑清1,2,3，方媛1,2，丁鑄1,2

2022年第3期

摘要

引用本文

摘 ? 要：綜述了近年來磷酸鎂水泥（MPC）作為修復加固材料的研究進展，介紹了在工程結構中MPC的修復、加固及防銹作用，并解釋了其修復、加固作用的原理及應用效果，還指出了目前存在的問題和今后的研究趨勢。 Abstract: The research progress of magnesium phosphate cement (MPC) as a repair and reinforcement material in recent years is reviewed, and the repair, reinforcement and rust prevention of MPC in engineering structures are introduced, and the principle and application effect of its repair and reinforcement are introduced. ?In addition, current problems and future research trends are put forward.

胡玥,鄭淑清,方媛,等.磷酸鎂水泥在工程結構中的修復加固研究進展[J].混凝土與水泥制品,2022(3):34-38,55. HU Y,ZHENG S Q,FANG Y,et al.Research Progress of Repairing and Strengthening for Engineering Structures with Magnesium Phosphate Cement[J].China Concrete and Cement Products,2022(3):34-38,55.

火災高溫后混凝土剩余強度及本構方程研究

楊倩1，賈恒瑞2，陳宗平3,4

2022年第3期

摘要

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摘 ? 要：為了深入研究工程建設中幾種C25~C40強度等級混凝土經歷火災高溫后的力學性能變化規律，提出了相對精確的剩余強度計算方法和受壓本構方程，以經歷溫度、混凝土強度等級、恒溫時間為變化參數，設計并完成了120個棱柱體試件的軸壓試驗，分析了各變化參數對其峰值應力、軸壓剛度及耗能能力的影響規律，并給出了相應的剩余強度計算公式和軸壓應力-應變本構方程的參數取值。結果表明，各試件的峰值應力、軸壓剛度及耗能能力均隨經歷溫度的升高而逐漸降低，隨混凝土強度等級的提升呈現先小幅降低而后升高的變化趨勢；增加恒溫時間對試件的軸壓力學性能不利，但影響程度不大。 Abstract: In order to further study the mechanical properties change rule, more accurate residual strength calculation method and compression constitutive equation of C25~C40 concrete after high temperature are put forward, taking the experience temperature, concrete strength grade and constant temperature time as variable parameters, and the axial compression tests of 120 specimens were designed and completed. The influence of various parameters on the peak stress, axial compression stiffness and energy dissipation capacity was analyzed. The corresponding residual strength calculation formula and the parameter values of axial compression stress-strain constitutive equation were given. The results show that the peak stress, axial compression stiffness and energy dissipation capacity of the specimens decrease gradually with the increase of temperature, and it decrease slightly at first and then increase with the increase of concrete strength grade. Increasing the holding time is unfavorable to the axial compression mechanical properties, but the effect is not significant.

楊倩,賈恒瑞,陳宗平.火災高溫后混凝土剩余強度及本構方程研究[J].混凝土與水泥制品,2022(3):28-33. YANG Q,JIA H R,CHEN Z P.Study on Residual Strength and Constitutive Equation of Concrete After Elevated to High Temperatures[J].China Concrete and Cement Products,2022(3):28-33.

含泥量對不同強度等級泵送山砂混凝土性能的影響

張彥1，譚文君2，高禮雄2，李紅輝1

2022年第3期

摘要

引用本文

張彥,譚文君,高禮雄,等.含泥量對不同強度等級泵送山砂混凝土性能的影響[J].混凝土與水泥制品,2022(3):24-27. ZHANG Y,TAN W J,GAO L X,et al.Influence of Mud Content on the Performance of Pumping Rock-sand Concrete with Different Strength Grades[J].China Concrete and Cement Products,2022(3):24-27.

大體積混凝土溫度-應力場理論研究和應用現狀綜述

劉丹1,2

2022年第3期

摘要

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摘 ? 要：簡述了大體積混凝土溫度場、應力場及其耦合理論的發展歷程和應用的研究進展，總結了各理論的優缺點、適用條件和應用現狀，討論了實際工程中大體積混凝土溫度-應力場分析的典型案例，并對大體積混凝土溫度-應力場理論的研究發展和工程應用方向進行了展望。 Abstract: Based on summary of the development process and application research of mass concrete temperature field, stress field and their coupling theory, the advantages, disadvantages, applicable conditions and application status of different theories are reviewed. The typical cases of mass concrete temperature-stress field analysis in engineering practice are discussed. The future development of temperature-stress field theory and engineering application of mass concrete are prospected.

劉丹.大體積混凝土溫度-應力場理論研究和應用現狀綜述[J].混凝土與水泥制品,2022(3):17-23. LIU D.Review of Theoretical Research and Application of Temperature-Stress Field of Mass Concrete[J].China Concrete and Cement Products,2022(3):17-23.

不同摻合料對透水混凝土性能的影響

尹志剛1，張愷 2,3，劉松顏1

2022年第3期

摘要

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摘 ? 要：利用正交試驗方法研究了硅灰摻量（3%、5%、7%）、偏高嶺土摻量（8%、10%、12%）與聚丙烯纖維體積摻量（1%、2%、3%）對透水混凝土力學性能、滲透性能和耐久性能的影響。正交試驗結果表明：硅灰對透水混凝土力學性能的影響較為顯著，纖維對透水混凝土連續孔隙率的影響較為顯著；得出推薦摻量為：硅灰摻量為7%、偏高嶺土摻量為10%、纖維摻量為2%。凍融循環試驗結果表明：透水混凝土的相對動彈性模量、抗壓強度均隨凍融循環次數的增加而降低，質量損失率、連續孔隙率和透水系數均隨凍融循環次數的增加而逐漸增大；透水混凝土凍融循環后的相對剩余抗壓強度與動彈性模量損傷度呈拋物線型下降的趨勢。 Abstract: The effect of silica fume content(3%, 5%, 7%), metakaolin content(8%, 10%, 12%) and polypropylene fiber volume fraction(1%, 2%, 3%) on mechanical properties, permeability and durability of pervious concrete(PC) was investigated by using orthogonal test method. The orthogonal test results show that the silica fume has a significant effect on the mechanical properties of PC, and fiber has a significant effect on the continuous porosity of PC. The recommended content is the silica fume content is 7%, metakaolin content is 10%, and fiber content is 2%. The test results of PC freezing-thawing cycles show that the relative dynamic modulus and compressive strength of PC decrease gradually with the increase of freezing-thawing cycles, and the change rate of mass loss, continuous porosity and permeability coefficient increase gradually with the increase of freezing-thawing cycles. The relative residual compressive strength and dynamic elastic modulus of PC show a parabolic decline trend after freeze-thaw cycles.

尹志剛,張愷,劉松顏.不同摻合料對透水混凝土性能的影響[J].混凝土與水泥制品,2022(3):11-16. YIN Z G,ZHANG K,LIU S Y.Effect of Different Admixtures on the Properties of Pervious Concrete[J].China Concrete and Cement Products,2022(3):11-16.

應力狀態下碳化與硫酸銨侵蝕對混凝土強度的影響

汪小平1,2，余濤1，李鑫1，李偉浪1，程可慧1

2022年第3期

摘要

引用本文

摘 ? 要：為研究硫酸銨溶液腐蝕環境下混凝土的性能變化，結合實際工程情況，通過對混凝土試件進行壓應力狀態下的硫酸銨溶液腐蝕和碳化交替試驗，研究了硫酸銨溶液濃度、壓應力比和交替次數對混凝土強度的影響，分析了硫酸銨溶液對混凝土強度的影響機理，并根據碳化與硫酸銨溶液交替作用下的強度變化規律，建立了專用的測強曲線方程。結果表明：在硫酸銨溶液腐蝕下，隨著腐蝕時間和溶液濃度的增加，混凝土強度下降；當壓應力比為20%和40%時，壓應力可以減小碳化和硫酸銨腐蝕對混凝土的不利影響；碳化與硫酸銨溶液腐蝕交替作用對混凝土的損傷有負面效應，存在疊加和交互作用。 Abstract: In order to study the performance change of concrete in the environment of ammonium sulfate solution erosion, combined with the actual engineering situation, the influence of ammonium sulfate concentration, compression stress ratio and alternating times on the strength of concrete was studied by alternating corrosion and carbonation of ammonium sulfate solution under compression stress. The influence mechanism of ammonium sulfate solution on concrete strength was analyzed, and the strength change rule under the alternating action of carbonization and ammonium sulfate solution was analyzed, and the special intensity measurement curve equations were established. The results show that under the ammonium sulfate corrosion, concrete strength decreases with increasing corrosion time and solution concentration, and when the compression stress ratio is 20% and 40%, the compression stress can reduce the adverse effects of carbonation and ammonium sulfate corrosion on concrete. The alternate action of carbonization and ammonium sulfate corrosion has a negative effect on the damage of concrete, and there are superposition and interaction effects.

汪小平,余濤,李鑫,等.應力狀態下碳化與硫酸銨侵蝕對混凝土強度的影響[J].混凝土與水泥制品,2022(3):6-10,16. WANG X P,YU T,LI X,et al.Influence of Carbonation and Ammonium Sulfate Erosion on Concrete Strength Under Stress[J].China Concrete and Cement Products,2022(3):6-10,16.

聚羧酸分子結構對混凝土早強性能的影響

周棟梁1，李申振1，楊勇1，舒鑫1，冉千平2

2022年第3期

摘要

引用本文

摘 ? 要：設計不同的側鏈長度、酸醚比和分子量制備了系列聚羧酸減水劑樣品，采用GPC方法測試了系列樣品的分子量和聚醚轉化率。通過砂漿和混凝土性能評價試驗表征了聚合物的分散性能和力學性能，用微量熱儀監測了水泥水化18 h內的水化放熱趨勢。試驗結果表明，聚羧酸分子中聚醚側鏈長度、酸醚比和分子量均能明顯影響砂漿的早期強度，分子結構綜合影響早強效果。水化放熱歷程證明，優化聚羧酸分子結構能加速水泥水化，影響規律與砂漿強度測試結果一致?；炷列阅軠y試顯示，聚羧酸減水劑系列樣品能縮短混凝土凝結時間，增加早期強度，且不影響后期強度的發展。 Abstract: A series of polycarboxylate superplasticizers were prepared by designing different side chain lengths, acid-ether ratios and molecular weights. The molecular weight and polyether conversion of the samples were investigated by GPC method. The performance of dispersion and mechanical properties of the polymers were characterized by the mortar and concrete performance test. The trend of hydration heat release within 18 h of cement hydration was monitored by microcalorimeter. The experimental results show that the length of polyether side chain, acid-ether ratio and molecular weight in polycarboxylate superplasticizers can significantly affect the early age strength of mortar. The effects of early age strength are caused by multiple factors of molecular structure. The hydration exothermic process proves that the optimized molecular structure can accelerate the hydration of cement. The influence rules for hydration heat are consistent with the results of mortar strength test. The results of concrete performance test show that the series of samples can shorten the setting time of concrete, increase the early age strength, and be particularly important not to affect the development of later strength.

周棟梁,李申振,楊勇,等.聚羧酸分子結構對混凝土早強性能的影響[J].混凝土與水泥制品,2022(3):1-5. ZHOU D L,LI S Z,YANG Y,et al.Effect of Molecular Structure of Polycarboxylate Superplasticizers on Early Age Strength of Concrete[J].China Concrete and Cement Products,2022(3):1-5.

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