第七期_2019_《混凝土與水泥制品》雜志社

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第七期

引氣劑對機制砂海工混凝土抗凍性能的影響

李維紅，范金朋，齊鑫，荀武舉，張鋮，陳宇紅

２０19年第7期

摘要

引用本文

摘要：系統研究了不同引氣劑摻量及類型對機制砂海工混凝土抗凍性能的影響，并通過氣孔間距試驗、電鏡掃描等試驗方法，分析了凍融環境下不同引氣劑對機制砂海工混凝土的作用機理。試驗結果表明，當ML類引氣劑摻量為0.4%時，機制砂海工混凝土有較好的抗凍性能；醚類引氣劑可進一步改善混凝土的工作性，其引入的微小氣泡可以改善混凝土的包裹性，同時不影響混凝土的抗壓強度；混凝土氣泡間距系數、平均氣孔弦長越小，其抗凍性能越好。 Abstract: The effects of different types and contents of air entraining agents and their dosages on the frost resistance of marine concrete with manufactured sand are systematically studied. The mechanism of action of different air entraining agents on marine concrete with manufactured sand under freeze-thaw environment is analyzed by means of pore spacing tests and SEM. The test results show that: when the content of domestic ether air entraining agent is 0.4%, the marine concrete with manufactured sand has better frost resistance. Ether air-entraining agent can further improve the performance of concrete than rosin air-entraining agent. The micro-bubbles introduced by ether air-entraining agent can improve the encapsulation of concrete without affecting the compressive strength of concrete. The smaller the spacing coefficient of air bubbles and the average chord length of pore, the better the frost resistance of concrete.

李維紅,范金朋,齊鑫,等.引氣劑對機制砂海工混凝土抗凍性能的影響[J].混凝土與水泥制品,2019(7):1-3+8. LI W H,FAN J P, QI X,et al.The Influence of Air Entraining Agent on Frost Resistance of Marine Concrete with Manufactured Sand[J].China Concrete and Cement Products,2019(7):1-3+8.

石屑對混凝土工作性及強度的影響試驗研究

趙明亮1，黃赟2，費洗非3，水中和2，郭偉3

２０19年第7期

摘要

引用本文

摘要：針對石屑應用引起的細骨料性質波動，探究了石屑石粉含量、取代海砂比例對混凝土工作性、強度的影響，并提出了混凝土工作性調整的相關建議。結果表明，石粉含量每增加1%，外加劑適宜摻量需增加0.054%；當砂率小于41%時，石屑對混凝土工作性影響可不予考慮，當砂率大于41%時，應控制石屑比例不超過60%；當砂率為43%，石屑比例為40%時，中低強度等級混凝土的和易性、黏聚性達到最佳；混凝土外加劑與等效砂漿外加劑適宜摻量關系為：y=0.88x＋0.39，可為細骨料波動下混凝土外加劑調整提供參考。 Abstract：Aiming at the fluctuation of fine aggregate properties caused by the application of stone chips, the influence of the content of stone powder and the proportion of replacing sea sand on the workability and strength of concrete was studied, some suggestions for the adjustment of workability were put forward. The results show that when the content of stone powder increases by 1%, the suitable amount of admixture needs to increase by 0.054%; when the sand ratio is less than 41%, the influence of stone chips has little effect on the workability of concrete; when the sand ratio is more than 41%, the proportion of stone chips should be controlled not to exceed 60%; when the sand ratio is 43%, the proportion of stone chips is 40%, the workability and cohesiveness of medium-low grade concrete are the best; the relationship of suitable amount of admixture between equivalent mortar and concrete is y=0.88x+0.39, which can provide reference for the adjustment of concrete admixture under the fluctuation of fine aggregate.

趙明亮,黃赟,費洗非,等.石屑對混凝土工作性及強度的影響試驗研究[J].混凝土與水泥制品,2019(7):4-8. ZHAO M L,HUANG Y,FEI X F,et al.Experimental Research on the effect of Stone Chips on Workability and Strength of Concrete[J].China Concrete and Cement Products,2019(7):4-8.

改性納米SiO2有機成膜涂層對混凝土抗氯離子滲透性能的影響

韓建軍1，王俊偉1，呂亞軍2

２０19年第7期

摘要

引用本文

摘要：為了研究改性納米SiO2有機成膜涂層對混凝土抗氯離子滲透性能的影響。選擇氯化橡膠（CR）、丙烯酸（AA）、醇酸磁漆（AR）三種有機成膜涂料，制備出了6種改性和未改性納米SiO2有機成膜復合涂層混凝土，并采用電通量方法對涂層混凝土進行抗氯離子滲透能力測試。試驗結果表明：在不同涂層材料中摻入未改性納米SiO2的摻量為1%、2%以及改性納米SiO2的摻量為2%、3%時，成膜復合涂層混凝土的抗氯離子滲透性能最好，且改性比未改性納米SiO2的改善效果要好。接觸角測試結果表明：涂層混凝土的抗氯離子滲透能力與涂層的疏水能力之間存在正相關關系，即表面涂層的疏水性能越強，涂層混凝土的抗氯離子滲透性能越好。 Abstract: In order to study the effect of modified nano-SiO2 organic film composite coating on the chloride ion penetration resistance of concrete, three kinds of organic film-forming coatings were selected to prepare six modified and unmodified nano-SiO2 organic film-forming composite coating concretes, and the conductivity of the coated concrete was tested by the electric flux method. The results show that the improvement effect of the coating concrete with different coating type and W/C is different. The lower the W/C of concrete, the better the chloride ion penetration resistance of the coated concrete. The effect of nano-SiO2 particles on different coatings is different. Different types of film-forming coatings have different optimum nano-SiO2 content, and the modified SiO2 has better improvement effect than unmodified SiO2. The contact angle test shows that there is a positive correlation between the chloride ion penetration resistance of the coated concrete and the hydrophobic ability of the coating.

韓建軍,王俊偉,呂亞軍.改性納米SiO2有機成膜涂層對混凝土抗氯離子滲透性能的影響[J].混凝土與水泥制品,2019(7):9-12. HAN J J,WANG J W,LYU Y J.The Influence of Modified Nano-SiO2 Organic Film-forming Composite Coating on Chloride Ion Penetration Resistance of Concrete[J].China Concrete and Cement Products,2019(7):9-12.

超高性能混凝土的自收縮特性研究

張秀貞1,2，劉志超1,2，3，王發洲1,2，商得辰4，5

２０19年第7期

摘要

引用本文

摘要：系統研究了不同引氣劑摻量及類型對機制砂海工混凝土抗凍性能的影響，并通過氣孔間距試驗、電鏡掃描等試驗方法，分析了凍融環境下不同引氣劑對機制砂海工混凝土的作用機理。試驗結果表明，當ML類引氣劑摻量為0.4%時，機制砂海工混凝土有較好的抗凍性能；醚類引氣劑可進一步改善混凝土的工作性，其引入的微小氣泡可以改善混凝土的包裹性，同時不影響混凝土的抗壓強度；混凝土氣泡間距系數、平均氣孔弦長越小，其抗凍性能越好。 Abstract: The effects of different types and contents of air entraining agents and their dosages on the frost resistance of marine concrete with manufactured sand are systematically studied. The mechanism of action of different air entraining agents on marine concrete with manufactured sand under freeze-thaw environment is analyzed by means of pore spacing tests and SEM. The test results show that: when the content of domestic ether air entraining agent is 0.4%, the marine concrete with manufactured sand has better frost resistance. Ether air-entraining agent can further improve the performance of concrete than rosin air-entraining agent. The micro-bubbles introduced by ether air-entraining agent can improve the encapsulation of concrete without affecting the compressive strength of concrete. The smaller the spacing coefficient of air bubbles and the average chord length of pore, the better the frost resistance of concrete.

張秀貞,劉志超,王發洲,等.超高性能混凝土的自收縮特性研究[J].混凝土與水泥制品,2019(7):13-16+22. ZHANG X Z,LIU Z C,WANG F Z,et al.Study on Autogenous Shrinkage Characteristics of Ultra High Performance Concrete (UHPC)[J].China Concrete and Cement Products,2019(7):13-16+22.

新分子結構混凝土引氣劑及其合成制備方法研究進展

王棟民，白亞飛，杜文倩

２０19年第7期

摘要

引用本文

摘要：基于混凝土引氣劑界面活性、起泡原理與穩泡原理出發，從分子結構與合成制備角度介紹了國內外經典的引氣劑分子結構類型，闡述了最新國內外新分子結構引氣劑及其合成制備方法，討論并分析了最新國內外新分子結構引氣劑在混凝土中所起的作用及其對混凝土工作性、抗凍性等耐久性性能改善與提高的具體影響，敘述和比較了國內外引氣劑的優點與不足，提出了“理想”引氣劑分子結構具備的要素和特征。有助于更好地從分子結構角度設計并研發出具有優異性能的新型結構引氣劑，并解決低坍落度塑性混凝土和無坍落度干硬性混凝土難引氣等問題，有利于更好解決混凝土工作性、抗凍性等耐久性問題。 Abstract：Based on the interfacial activity, foaming principle and foam stabilization principle of air entraining agent in concrete, the classical molecular structures of air entraining agent from the perspective of molecular structure and synthetic preparation are introduced, the latest domestic and international new molecular structure of air entraining agent and its synthetic preparation methods are expounded, and the roles of the latest domestic and international new molecular structure of air entraining agent in concrete and its specific impact on the improvement durability of workability and frost resistance in concrete are discussed and analyzed. In addition, the advantages and disadvantages of air entraining agents at home and abroad were reviewed and compared, and the elements and characteristics of molecular structure of the"ideal"air entraining agent were proposed. The results help to better design and develop a new type of structural air entraining agent with excellent performance from the molecular structure of point, which helps to solve problems of air entraining agent in the low-slump plastic and the non-slump drying hard concrete, such as the problem of air induction, and it is beneficial to better solve the durability problems such as concrete workability and frost resistance.

王棟民,白亞飛,杜文倩.新分子結構混凝土引氣劑及其合成制備方法研究進展[J].混凝土與水泥制品,2019(7):17-22. WANG D M,BAI Y F,DU W Q.Research Development of New Molecular Structure of Air Entraining Agent and Its Synthetic Preparation Methods[J].China Concrete and Cement Products,2019(7):17-22.

火成巖機制砂C35混凝土的配制及性能研究

隋術波1，夏京亮2，周永祥2

２０19年第7期

摘要

引用本文

摘要：采用肯尼亞火成巖機制砂從膠凝材料優化、粉煤灰摻量、砂率和石粉含量等幾個角度開展試驗研究，結果表明，在一定范圍內，隨著粉煤灰摻量的增加，混凝土的坍落度和擴展度增大，混凝土抗壓強度降低，特別是混凝土早期強度降低幅度較為明顯；混凝土電通量隨著粉煤灰摻量的增加而降低，隨著粉煤灰摻量的增加，電通量降低幅度有所減緩；砂率對混凝土坍落度和電通量的影響較小，隨著砂率的提高，混凝土抗壓強度有所降低；隨著機制砂石粉摻量的增加，混凝土坍落度和擴展度均在增大，混凝土抗壓強度有所提高，混凝土電通量有所降低，在石粉含量7%以上時，其對混凝土電通量影響不大。 Abstract: Kenya igneous rock machine-made sand was used to carry out experimental research from the aspects of cementitious material optimization, fly ash content, sand ratio and stone powder content. The results show that with the increase of fly ash content, slump and slump flow of concrete increases, concrete compressive strength decreases, especially the early strength of concrete decreases significantly; concrete electric flux increases with the increase of fly ash content. With the increase of fly ash content, the decrease of electric flux is slowed down; sand ratio has little influence on concrete slump and electric flux, and with the increase of sand ratio, the compressive strength of concrete decreases; with the increase of machine-made sand powder content, the slump and expansion of concrete are increased, the compressive strength of concrete is increased, and the electric flux of concrete is reduced. When the content of stone powder is more than 7%, it has little effect on the electric flux of concrete.

隋術波,夏京亮,周永祥.火成巖機制砂C35混凝土的配制及性能研究[J].混凝土與水泥制品,2019(7):23-25. SUI S B,XIA J L,ZHOU Y X.Study on Preparation and Properties of C35 Concrete with Igneous Manufactured Sand[J].China Concrete and Cement Products,2019(7):23-25.

超高性能混凝土（UHPC）的配制及應用探究

李鋒，孔文藝，羅健，范曉玲，劉思昊

２０19年第7期

摘要

引用本文

摘要：選用合適的摻合料，采用正交法和最緊密堆積理論進行了超高性能混凝土（UHPC）基體的配合比實驗，通過對力學性能檢測，確定了UHPC基體的最優配合比，并在此基礎上探究了鋼纖維的摻量和摻入方式對UHPC性能的影響。試驗結果表明，選用合適的摻合料，通過合適的配合比試驗設計能配制出適于應用的UHPC。 Abstract:The mix proportion experiment of ultra high performance concrete without steel fibre was done by using right admixtures as reactive powder, orthogonal experiment and the closest packing experiment as methods. The optimal mix proportion of the ultra high performance concrete without steel fibre was obtained by testing the mechanical properties. And the influence of the incorporation method and the content of steel fiber on the performance of the ultra high performance concrete was studied. The results show that UHPC can also be obtained by using right admixtures and proper mix proportion design.

裝配式電纜排管防護溝槽設計與試驗研究

朱勇，許曉坡，吳凱

２０19年第7期

摘要

引用本文

摘要：為提高電力電纜排管防護溝槽的裝配化程度和便于局部更換，研發了預制裝配式排管防護溝槽結構體系，開展了溝槽結構的參數化設計。選取典型結構構造形式，采用原型試驗研究和有限元分析相結合的方法，分析了覆土厚度分別在1 m和3 m兩種工況下，結構應力分布和位移變化規律。研究結果表明，覆土厚度對結構豎向位移、普通鋼筋拉應力影響顯著，覆土厚度為3 m時的結構豎向位移、普通鋼筋拉應力值分別是覆土厚度為1 m時對應值的2.4倍和2.3倍。槽壁是結構主壓應力的控制構件，底板是縱向拉應力和主拉應力的控制構件。底板主拉應力隨覆土厚度增大而明顯增加，當覆土厚度為3 m時，主拉應力極值為2.61 MPa，略小于C50抗拉強度標準值2.64 MPa。 Abstract：In order to increase the extent of precast assembly of protective groove used for power cable in pipes and be convenient to local replacement, structural system of precast assembly protective groove used for power cable in pipes had been formed, and the parametric design had been carried out. Taking certain typical structural forms of the protective groove as the target of study, prototype experiment and finite element method were used, and two conditions were analyzed with different soil thickness which was respectively 1 m and 3 m, and the distribution of stress and displacement change were obtained. The results indicate that soil thickness has significant effects on the structural vertical displacement and the tensile stress of ordinary steel bars, and the structural vertical displacement and tensile stress when soil thickness is 3 m are 2.4, 2.3 times that of soil thickness is 1 m, respectively. Groove wall is the control component which has the biggest principal compressive stress, and the base plate is the control component which has the biggest longitudinal tensile stress and principal tensile stress. The max principal tensile stress of the base plate is increased with the increase of the soil thickness, when the soil thickness is 3 m, the max principal tensile stress is 2.61 MPa, which is smaller than 2.64 MPa of the tensile strength standard value as for C50 concrete.

朱勇,許曉坡,吳凱.裝配式電纜排管防護溝槽設計與試驗研究[J].混凝土與水泥制品,2019(7):30-33. ZHU Y,XU X P,WU K.Design and Experimental Research of Assembly Protective Groove Used for Powder Cable in Pipes[J].China Concrete and Cement Products,2019(7):30-33.

3D打印在建筑領域的應用

耿會嶺1,楊政2,袁雅賢3

２０19年第7期 NO.279 P34-38+83

摘要

引用本文

摘要：在分析現有3D打印技術的基礎上，對模型的格式進行了解析，并根據打印材料和打印方式對比分析了各自的特點和應用領域；對建筑3D打印的發展進行了展望。 Abstract： Based on the analysis of the existing 3D printing technology, the format of the model are analysed. According to the printing materials and printing methods, the characteristics and application fields of the technologies are compared and analyzed. Some prospects for the development of 3D printing for buildings are put forward.

耿會嶺,楊政,袁雅賢.3D打印在建筑領域的應用[J].混凝土與水泥制品,2019(7):34-38+83. GENG H L,YANG Z,YUAN Y X.Application for 3D Printing in the Field of Architecture[J].China Concrete and Cement Products,2019(7):34-38+83.

淺圓倉基礎樁土的共同作用實測分析

肖昭然，徐中原，蔣敏敏，劉海軍，張洋，郝友超

２０19年第7期

摘要

引用本文

摘要：結合實際工程，分析了不同位置、不同荷載情況下樁頂反力、樁間土壓力、樁與土分擔荷載的比例以及淺圓倉在建設過程中和加載過程中沉降大小和變化規律。結果表明，淺圓倉在主體竣工和試裝糧完成后地基土平均土壓力只占地基土承載力特征值的68.81%，沒有充分利用天然地基的承載力；由樁頂應變計實測結果可知，淺圓倉在裝糧荷載裝糧完成后，樁基內部樁承載力不到設計值的60%，樁基內部樁需優化設計。同時，隨著加載荷載的增加，樁間土分擔荷載的比例逐漸減少，裝糧完成時土承擔上部荷載的20%。實測沉降結果表明，沉降較小且較為均勻，倉體結構安全穩定。分析結果可為淺圓倉的基礎設計優化、施工及使用提供參考。 Abstract: Combined with practical engineering, the pile top reaction, soil pressure between piles, the proportion of load shared by piles and soil, and the settlement and variation law of shallow silo during construction and loading under different positions and loads were analyzed. The results show that the average soil pressure of foundation soil only accounts for 68.81% of the characteristic value of the bearing capacity of foundation soil after the completion of the main body of the silo and the completion of the trial grain. The bearing capacity of natural foundation is not fully utilized. The results of the pile top strain meter show that the bearing capacity of the inner pile of the pile foundation is less than 60% of the designed value after the grain loading of the shallow round silo is completed, and the internal pile of the pile foundation needs to be optimized. At the same time, the proportion of load sharing between piles decreases graduallyas with the load increases.When grain loading is finished, the soil bears 20% of the upper load. The measured settlement results show that the settlement is smaller and more uniform, and the silo structure is safe and stable, which provides a reference for the foundation design optimization, construction and use of the squat silo.

肖昭然,徐中原,蔣敏敏,等.淺圓倉基礎樁土的共同作用實測分析[J].混凝土與水泥制品,2019(7):39-42. XIAO Z R,XU Z Y,JIANG M M,et al.Analysis of the Interaction Between Pile and Soil in Squat Silo Foundation[J].China Concrete and Cement Products,2019(7):39-42.

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