混凝土研究_2021_《混凝土與水泥制品》雜志社

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混凝土研究

礦物摻合料混凝土抗氯離子滲透性能及時變規律

王藝霖，王順堯，劉巧玲，李廣寧

2021年第5期

摘要

引用本文

摘 ? 要：以非穩態氯離子遷移系數（D值）為指標，研究了復摻粉煤灰和礦粉的混凝土抗氯離子滲透性能及其時變規律。結果表明：降低水膠比，延長齡期（180 d以內）都能使混凝土的抗氯離子滲透性能增強；一定范圍內，抗氯離子滲透性能均隨礦粉摻量的增加而增加，隨粉煤灰摻量的增加而降低，當礦粉摻量分別為37.5%、31.9%時，C30、C45混凝土的抗氯離子滲透性能最佳；隨著齡期延長，C30、C45混凝土的D值差距增大；C30、C45混凝土在90 d、180 d的D值與粉煤灰、礦粉摻量之間的定量關系可用線性公式來表達；C30、C45混凝土的D值與齡期之間的定量關系可用基于Fick第二定律的冪函數表達，其中，指數a與粉煤灰摻量的關系可用高次多項式來表達。 Abstract: The resistance to chloride ion penetration and its time-dependent law of the concrete mixed with fly ash and slag powder were studied with the non-steady state chloride ion migration coefficient(D value) as index. The results show that the resistance to chloride ion penetration of concrete can be enhanced by reducing the water-binder ratio and extending the age (within 180 d). The resistance to chloride ion penetration increases with the increase of slag powder content and decreases with the increase of fly ash content. In certain extent, when the ratio of slag powder content to the total cementitious material reaches 37.5% and 31.9%, the resistance to chloride ion penetration of C30 and C45 concrete reaches the best. With the increase of age, the difference in D values of C30, C45 concrete will increase. Quantitative relationship between the D values of C30, C45 concrete at 90 d, 180 d age and the proportion of fly ash, slag powder in the total mass of the cementitious materials can be expressed by a linear formula. Quantitative relationship between the D values of C30 and C45 concrete and the age can be expressed by a power function based on the Fick’s second law. Relationship between the exponent a of the power function and the proportion of fly ash in the total mass of the cementitious materials can be expressed by a high-order polynomial.

王藝霖,王順堯,劉巧玲,等.礦物摻合料混凝土抗氯離子滲透性能及時變規律[J].混凝土與水泥制品,2021(5):1-5. WANG Y L,WANG S Y,LIU Q L,et al.Study on the Anti-chloride Ion Penetration Performance and Time-dependent Law of Mineral Admixture Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTES,2021(5):1-5.

鹽凍作用下混凝土力學性能研究及灰色預測

徐存東1,2,3，黃嵩1,3，劉子金1,3，李欣達1,3，李智睿1,3

2021年第5期

摘要

引用本文

摘 ? 要：為探究混凝土的劣化規律，對混凝土的力學性能進行了預測，以試驗室數據為基礎，構建了各項力學性能指標的灰色GM（1，1）預測模型，預測各項指標的劣化規律。結果表明：以鹽溶液作為凍融介質會加快試塊的破壞，且不同鹽溶液對試塊的破壞程度存在一定差距；獲得的灰色GM（1，1）預測模型精度滿足要求，可用于預測灌區內混凝土建筑物的力學性能。研究成果可以為寒旱灌區混凝土建筑的壽命預測與后期維護提供參考，也可為不同類型混凝土的各項性能預測提供研究方法。 Abstract: In order to find out the deterioration law of concrete and predict the durability of concrete a grey GM (1，1) prediction model of durability indexes was established based on laboratory test datas to predict the deterioration law of each index. The results show that using salt solution as freeze-thaw medium can accelerate the damage of test block. There is a certain gap between the damage degree of different salt solutions to test block. The accuracy of the grey GM(1，1) prediction model meets the requirements, and can be used to predict the durability of concrete buildings in irrigation districts. The research results can provide a reference for life prediction and later maintenance of concrete buildings in cold and arid irrigation areas, and also provide research methods for performance prediction of different types of concrete.

徐存東,黃嵩,劉子金,等.鹽凍作用下混凝土力學性能研究及灰色預測[J].混凝土與水泥制品,2021(5):6-10,32. XU C D,HUANG S,LIU Z J,et al.Mechanical Property Research and Grey Prediction of Concrete Under Salt Freezing[J].CHINA CONCRETE AND CEMENT PRODUCTES,2021(5):6-10,32.

低堿性電解水對粉煤灰砂漿性能的影響

張天宇1 ，王亮2，李秋義1,2

2021年第5期

摘要

引用本文

摘 ? 要：采用pH值為9.5的低堿性電解水制備粉煤灰砂漿，通過對比不同粉煤灰摻量條件下，低堿性電解水粉煤灰砂漿（EM）和普通自來水粉煤灰砂漿(OM)的工作性及力學性能，研究了低堿性電解水對粉煤灰砂漿性能的影響。結果表明：EM的工作性優于OM；控制流動度在（210±5）mm時，各組粉煤灰摻量的EM單位用水量均小于OM；低堿性電解水能夠提高粉煤灰砂漿的強度，還能激發粉煤灰的早期活性效應，從而提高粉煤灰砂漿的早期強度，EM的早期抗壓強度發展速率較OM提高了11.7%。 Abstract: The low-alkaline electrolyzed water with pH of 9.5 was used as the mixing water to prepare fly ash mortar, and the effect of low-alkaline electrolyzed water on the performance of fly ash mortar was researched by comparing the workability and the mechanical properties of low-alkaline electrolyzed water fly ash mortar (EM) and the ordinary fly ash mortar (OM) with different fly ash contents. The results show that the workability of EM preceds that of the OM. The unit water consumption of EM is less than that of OM with the fluidity (210±5)mm. The low-alkaline electrolyzed water can improve the strength of fly ash mortar. Electrolyzed water can stimulate the early activity and improve the early curing age strength of fly ash mortar, during the early curing age，the compressive strength improvement rate of EM is 11.7% higher than that of OM.

張天宇,王亮,李秋義.低堿性電解水對粉煤灰砂漿性能的影響[J].混凝土與水泥制品,2021(5):11-15. ZHANG T Y,WANG L,LI Q Y.Effect of Low-alkaline Electrolyzed Water on the Performance of Fly Ash Mortar[J].CHINA CONCRETE AND CEMENT PRODUCTES,2021(5):11-15.

再生混凝土受壓應力-應變本構關系研究

李雪良1，楊海峰2，趙修敏3,4，劉成麗2，梁冬瑤2

2021年第5期

摘要

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摘 ? 要：通過改變石粉（SP）含量（0、5%、10%、15%）和再生粗骨料（RCA）取代率（0、33%、66%、100%）進行了48個棱柱體受壓應力-應變全曲線試驗，研究了石粉、再生粗骨料對機制砂再生混凝土軸心抗壓強度、峰值應變和彈性模量的影響?；趽p傷力學原理，參考已有的普通混凝土應力-應變本構關系，建立了機制砂再生混凝土單軸受壓應力-應變本構方程。結果表明：理論曲線與試驗數據吻合度較好。 Abstract: 48 prismatic specimens with full manufactured sand and different levels of recycled coarse aggregate (RCA) were prepared to test the compressive stress-strain curves. The effect of limestone powder (SP) in manufactured sand (0, 5%,10%, 15%) and RCA(0, 33%, 66%, 100%) on axial compressive strength, peak strain and elastic modulus of the concrete was studied. Based on the damage mechanics theory and the compressive constitutive relation of commom concrete, the stress-strain equation of concrete with recycled coarse aggregate and manufactured sand was established. The results show that the theoretical curves have high coincidence degree with the experimental data.

李雪良,楊海峰,趙修敏,等.再生混凝土受壓應力-應變本構關系研究[J].混凝土與水泥制品,2021(5):16-20. LI X L,YANG H F,ZHAO X M,et al.Stress-strain Relationship of Recycled Concrete Under Uniaxial Compressive[J].CHINA CONCRETE AND CEMENT PRODUCTES,2021(5):16-20.

基于超聲波測試的凍融循環作用下混凝土強度損傷演變研究

黃奕霖1，嚴武建2，牛富俊1

2021年第5期

摘要

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摘 ? 要：針對高寒地區混凝土抗凍耐久性問題，在混凝土中加入不同摻量的粉煤灰研究其抗凍性能，通過非金屬聲波檢測儀進行凍融循環過程中混凝土強度無損測試，研究了凍融循環作用下混凝土強度損傷和動彈性力學參數的演化特征，分析了凍融循環過程中混凝土聲波波速與力學性能變化規律。研究結果表明：摻入引氣劑能夠提高混凝土的抗凍性，相同引氣劑摻量下，粉煤灰摻量為10%的混凝土抗凍性較好；凍融循環過程中，超聲波縱波波速、橫波波速與動彈性模量、動剪切模量均隨著凍融循環次數的增加呈相似性衰減，且存在較高相關性。 Abstract: In view of the problem of frost resistance durability of concrete in alpine area, the frost resistance of concrete was studied by adding fly ash with different content. By using non-metallic acoustic wave detector to test the strength of concrete during freeze-thaw process, the characteristics of strength damage and dynamic elastic mechanical parameters evolution of concrete under freeze-thaw cycle were studied. The change law of concrete acoustic wave speed and mechanical properties during the freeze-thaw cycle were analyzed. The results show that the frost resistance of concrete can be improved by adding air entraining agent, and the frost resistance of concrete with 10% fly ash content is better than that of 20% fly ash content under the same air entraining agent. The ultrasonic longitudinal wave velocity and shear wave velocity, dynamic elastic modulus and dynamic shear modulus attenuate similarly with the increase of freeze-thaw cycle times during freeze-thaw process, and there is a correlation between them.

黃奕霖,嚴武建,牛富俊.基于超聲波測試的凍融循環作用下混凝土強度損傷演變研究[J].混凝土與水泥制品,2021(5):21-25. HUANG Y L,YAN W J,NIU F J.Study on Damage Evolution of Concrete Strength Under Freeze-thaw Cycles Action Based on Ultrasonic Tests[J].CHINA CONCRETE AND CEMENT PRODUCTES,2021(5):21-25.

Ⅲ級粉煤灰和石粉雙摻對C50泵送混凝土可泵性的影響

馬挺1，張美香2，田崇霏3，白召軍1，霍虎2，羅忠濤2，劉錦濤4

2021年第5期

摘要

引用本文

馬挺,張美香,田崇霏,等.Ⅲ級粉煤灰和石粉雙摻對C50泵送混凝土可泵性的影響[J].混凝土與水泥制品,2021(5):26-28. MA T,ZHANG M X,TIAN C F,et al.Effect of Grade Ⅲ Fly Ash and Stone Powder on Pumpability of C50 Pumping Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTES,2021(5):26-28.

緩凝型改性淀粉基減水劑的合成與性能研究

錢亞杰1，曹利敏1，萬秀琴2

2021年第5期

摘要

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錢亞杰,曹利敏,萬秀琴.緩凝型改性淀粉基減水劑的合成與性能研究[J].混凝土與水泥制品,2021(5):29-32. QIAN Y J,CAO L M,WAN X Q.Study on the Synthesis and Performance of Retarding Modified Starch-based Water Reducer[J].CHINA CONCRETE AND CEMENT PRODUCTES,2021(5):29-32.

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