第六期_2017_《混凝土與水泥制品》雜志社

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第六期

不同來源重金屬元素在混凝土中的浸出性研究

韓彩霞1，崔素萍2，劉輝2，杜鑫2

2017年第7期

摘要

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摘要：研究了不同來源重金屬元素在混凝土中的浸出性，從膠凝材料、骨料和外加重金屬元素三方面闡述重金屬元素的浸出性。結果表明，純水泥、水泥與粉煤灰質量比為7∶3、水泥與礦粉量比為7∶3三種膠凝體系中的重金屬浸出率低，其中，純水泥漿體中檢測不到重金屬離子的浸出；所選四個地區的天然粗骨料和六個地區的天然細骨料中的重金屬含量和重金屬浸出性各有差異，其中Pb和Zn相對含量及浸出率較高；而骨料中重金屬的浸出率極低，Zn的相對浸出率較高；水泥凈漿中外摻六種可溶性重金屬鹽或重金屬氧化物表現出不同的重金屬浸出性，外摻重金屬氧化物，凈漿的重金屬浸出率較低，而外摻可溶性重金屬鹽，水泥凈漿的重金屬浸出率相對較高。 Abstract: The leachability of heavy metal elements in different sources of concrete including cementitious materials, aggregates and adding soluble heavy metal salts or heavy metal oxides was investigated. The results showed that the pastes of pure cement, 70% cement + 30% fly ash and 70% cement + 30% slag have low heavy metal elements leachability and pure cement pastes have no heavy metals extraction content; coarse aggregates obtained from four districts and fine aggregate obtained from six districts have different heavy metal elements content and different leachability; heavy metals leachability of cement pastes was increased when adding soluble heavy metal salts into cement pastes compared with adding heavy metal oxides.

韓彩霞,崔素萍,劉輝,等.不同來源重金屬元素在混凝土中的浸出性研究[J].混凝土與水泥制品,2017(6):91-94. HAN C X, CUI S P, LIU H,et al.Study on Leachability of Heavy Metal Elements in Different Sources in Concrete[J].China Concrete and Cement Products,2017(6):91-94.

幾種礦物摻合料對混凝土脆性及早期開裂性能影響比較

宋旭艷1，孫保金2，韓靜云1，郜志海1

２０17年第6期

摘要

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摘要：將礦粉、粉煤灰、垃圾焚燒飛灰、垃圾焚燒底渣以單摻或1:1二元復摻替代部分水泥后，配制摻合料混凝土，測定其力學強度和拉壓比，并利用平板法研究比較各摻合料混凝土的早期抗開裂性能。研究表明，粉煤灰具有適當降低混凝土的脆性和抑制早期開裂的性能，而礦粉的作用與其相反；飛灰對混凝土的早期開裂性能極為不利，在飛灰中復合部分粉煤灰或礦粉，可大大改善混凝土的早期抗裂性能；底渣混凝土因強度太低早期未出現明顯的開裂，但在底渣中引入部分礦粉或粉煤灰后，混凝土的抗壓強度能比單摻底渣混凝土明顯提高，同時該底渣基復合摻合料混凝土的抗裂性能優異。 Abstract：Admixture concrete was prepared with slag, fly ash, waste incineration fly ash and waste incineration bottom ash replacing parts of cement singly or mixed both with the rate of 1:1. Mechanical strength and tension strength/compressive strength of corresponding concrete were tested. Plate method was used to study the early cracking resistance of every admixture concrete. The results showed that fly ash can appropriately reduce the brittle and restrain the early cracking of concrete, but slag plays an opposite function. The effect of waste incineration fly ash on early cracking of admixture concrete may be extremely unfavorable. Parts of fly ash or slag mixed into waste incineration fly ash can improve the early cracking resistance of corresponding concrete greatly. Because of poor strength of waste incineration bottom ash concrete, no obvious cracking phenomenon appear. But when parts of fly ash or slag were mixed into waste incineration bottom ash, compressive strength of corresponding concrete was significantly improved and its early cracking resistance was excellent, comparing with that of waste incineration bottom ash.

宋旭艷,孫保金,韓靜云,等.幾種礦物摻合料對混凝土脆性及早期開裂性能影響比較[J].混凝土與水泥制品,2017(6):86-90. SONG X Y, SUN B J, HAN J Y,et al.Comparison of Effects of Several Kinds of Mineral Admixtures on Brittleness and Early-age Cracking Performance of Concrete[J].China Concrete and Cement Products,2017(6):86-90.

盾構法施工對隧道穩定性的仿真分析

王軍

２０17年第6期

摘要

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摘要：以南京地鐵十四號線工程盾構施工為依托，借助ANSYS有限元軟件，針對該工程中的翠屏山隧道建立了三維數模進行仿真計算與分析。計算結果表明，地鐵隧道盾構施工對翠屏山隧道周圍土體擾動較小，后者整體保持穩定，未出現大的異變；最大應變區域發生在翠屏山隧道中心區域，隧道底板最大下沉量為18.2mm，建議在該區域加密抗拔樁，以減小土體變形。 Abstract: Based on the shield construction of Nanjing Metro Line No.14, ANSYS finite element software is used to establish the 3D model of Cuipingshan Tunnel for simulation calculation and analysis. The results show that the subway shield tunnel construction has little influence on the surrounding soil of Cuipingshan Tunnel, the surrounding soil can maintain the overall stability and has no major changes. The maximum strain occurred in the center area of Cuipingshan Tunnel floor area, the maximum subsidence quantity is 18.2mm, which indicates that the uplift pile should be increased density to reduce soil deformation.

王軍.盾構法施工對隧道穩定性的仿真分析[J].混凝土與水泥制品,2017(6):82-85. WANG J.Simulation Calculation Analysis of Shield Construction on Stability of Subway[J].China Concrete and Cement Products,2017(6):82-85.

袖閥管注漿用套殼料配合比試驗研究及工程應用

王生1，郭佳奇1，劉彥清2，趙營1

２０17年第6期

摘要

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摘要：依托湖北某客運專線涵路過渡段采用袖閥管注漿加固法治理路基沉降工程，開展了袖閥管注漿用套殼料配合比室內試驗研究，依據試驗結果分析了套殼料各摻料對套殼料強度及其拌合物初凝、終凝時間的影響規律；結合工程特點，確定了該客運專線病害治理中袖閥管注漿加固用套殼料的合理配比，現場應用效果表明該配比較為合適，研究成果可為運營高鐵路基沉降病害治理提供借鑒。 Abstract: Based on the test of the compaction ratio of the casing and the grouting material of the sleeve valve tube, the influence of the shell material on the transition section of a passenger line of Wuhan Passenger Dedicated Line was analyzed by the sleeve valve pipe grouting reinforcement method. Based on the characteristics of the project, the reasonable proportion of the shell material for the grouting pipe reinforcement was determined. The effect indicates that the ratio is appropriate. The results provide a reference for the management of the settlement of high-speed railway subsidence.

王生,郭佳奇,劉彥清,等.袖閥管注漿用套殼料配合比試驗研究及工程應用[J].混凝土與水泥制品,2017(6):76-81. WANG S, GUO J Q, LIU Y Q,et al.Experimental Research and Engineering Application on Mix Proportion of Sleeve Valve Grouting Used by Casing Materials[J].China Concrete and Cement Products,2017(6):76-81.

用可溶性SiO2法測定摻加粉煤灰硬化砂漿中水泥含量的研究

張亞濤，劉長順，朱田生，武允超，徐偉

２０17年第6期

摘要

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摘要：為改進可溶性SiO2法測定摻加粉煤灰的硬化砂漿中水泥含量，成型了不同粉煤灰摻量的砂漿試樣?；跍囟葘τ不皾{結構和溶解度的影響以及粒徑對測定結果干擾程度的分析，優化了測定摻加粉煤灰的硬化砂漿中水泥含量的可溶性SiO2法，采用該測定方法后，硬化粉煤灰砂漿中水泥含量的相對誤差絕對值可控制在5%以內，并且該方法能為摻加粉煤灰的硬化混凝土中水泥含量的測定提供參考。 Abstract: In order to improve the soluble silica method that measuring the real value of cement content in hardened fly ash mortars, different samples with varied content of fly ash were prepared. Based on the effect of temperature on structure and solubility of hardened mortars, the analysis about interference degree of hardened mortars’ particle size to measuring result, the method was optimized. By using this optimized method, the absolute value about relative deviation of cement content of hardened fly ash mortars was set within 5%. And this optimized method can give some help to the measuring of cement content in hardened fly ash concretes.

張亞濤,劉長順,朱田生,等.用可溶性SiO2法測定摻加粉煤灰硬化砂漿中水泥含量的研究[J].混凝土與水泥制品,2017(6):72-75. ZHANG Y T, LIU C S, ZHU T S,et al.Study on Measuring Cement Content in Hardened Fly Ash Mortars with Soluble Silica Method[J].China Concrete and Cement Products,2017(6):72-75.

鋼筋鐓頭器的改進分析

張會強

２０17年第6期

摘要

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摘要：介紹了預應力混凝土水泥制品中的高強度鋼筋在張拉前進行的鐓頭工作?？紤]到實際應用中早期的液壓型鋼筋鐓頭器通過碟型彈簧的壓力進行鋼筋的夾緊存在一定的缺陷和采用內外油缸并聯的方式易產生誤動作，提出了改進方案并予以實施。實踐證明，改進后的鋼筋墩頭器有很好的應用效果。 Abstract: The pier head work that the tension of high strength steel in the pre-stressed concrete cement products is introduced. Considering the insufficient of the practical application of hydraulic clamping and the misoperation during the production, the improvement scheme and implementation is put forward. Practice has proved that the improved reinforced pier head has a good application effect.

張會強.鋼筋鐓頭器的改進分析[J].混凝土與水泥制品,2017(6):70-71. ZHANG H Q.Improvement Analysis on Reinforced Pier Head[J].China Concrete and Cement Products,2017(6):70-71.

預制裝配式混凝土型鋼梁-柱節點技術研究現狀

李亞萍，陳國平

２０17年第6期

摘要

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摘要：裝配式建筑預制構件之間需要可靠的連接，并且整個裝配式建筑結構的整體性對抗震性能有較大的影響，隨著建筑產業化的推進，型鋼混凝土結構迅速發展。本文介紹了裝配式梁-柱連接節點的連接類型以及型鋼混凝土節點的分類及特點，總結了國內外預制裝配式混凝土結構最新型鋼梁-柱節點的連接方式，分析了最新各種型鋼梁-柱節點連接方式的優缺點及研究現狀，對裝配式型鋼梁-柱節點需要進一步研究的關鍵問題及未來的發展方向提出展望。 Abstract: The need for reliable connection between prefabricated construction of prefabricated and the wholeness of the entire prefabricated building structure has great influence to the seismic performance, along with the advancement of building industrialization, steel reinforced concrete structure develops rapidly. The prefabricated beam-column connection node connection types, classification and characteristics of steel reinforced concrete node are introduced, the prefabricated concrete structure at home and abroad are summarized, the newest type steel beam column node connections, the advantages and disadvantages of various type steel beam-column node connection mode and the research status are analyzed. The key problems and future development direction of the prefabricated steel beam-column nodes need to further study and put forward outlook.

李亞萍,陳國平.預制裝配式混凝土型鋼梁-柱節點技術研究現狀[J].混凝土與水泥制品,2017(6):67-69. LI Y P, CHEN G P.Research Status of Steel Beam-column Nodes Technology for Prestressed Prefabricated Concrete[J].China Concrete and Cement Products,2017(6):67-69.

不同維數地震動輸入下隔震支座拉壓剛度比研究

劉夢澤，張俊

２０17年第6期

摘要

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摘要：傳統的隔震分析大都是基于一維和二維地震動進行的，很少考慮三維地震動的作用。且對于不同維數地震動輸入下，拉壓剛度比對隔震支座面壓的影響也缺乏系統的研究。本文對8度區的某高層隔震結構進行了時程分析，首先在拉壓剛度比不變的情況下，對比研究了地震動輸入維數對隔震支座面壓的影響。然后以地震動輸入維數為定量，拉壓剛度比為變量，對隔震支座面壓的變化情況和變化規律進行了分析。研究發現，拉壓剛度比不變時，隨著地震動輸入維數的增加，隔震支座的壓應力和拉應力均呈現逐漸增大的趨勢。相同維數地震動輸入下，拉壓剛度比對隔震支座的拉應力影響較大，但對壓應力影響很小，且拉壓剛度比相同時，隔震支座的拉應力遠超過規范值。 Abstract：The traditional isolation analysis is mostly based on one-dimensional and two-dimensional ground motion, and rarely consider the role of three-dimensional ground motion. And the influence of tension and compression stiffness on the surface pressure of the isolation bearing is not studied systematically for different ground motion loads. In this paper, the time-history analysis of a high-level isolation structure in the 8 degree area is carried out. Firstly, the influence of the input dimension of the ground motion on the surface pressure of the isolation bearing is studied. Then, the change of the surface pressure of the isolation bearing and the variation law are analyzed. The results shows that the compressive stress and tensile stress of the isolated bearing are gradually increasing with the increase of the input dimension of the ground motion. With the same dimension of ground motion input, the tensile and compressive stiffness has a greater effect on the tensile stress of the isolation bearing, but the impact of the compressive stress is very small, and the tensile and compressive stiffness ratio is the same, the tensile stress of the isolation bearing is far more than the standard value.

劉夢澤,張俊.不同維數地震動輸入下隔震支座拉壓剛度比研究[J].混凝土與水泥制品,2017(6):60-66. LIU M Z, ZHANG J.Study on Ratio of Tension to Compression of Different Dimensions Ground Motion Loads[J].China Concrete and Cement Products,2017(6):60-66.

鉬尾礦機械活化處理及對硅酸鈣板性能的影響

戰佳宇1，楊飛華1,2，耿春雷1，李萬民1，楊闖1

２０17年第6期

摘要

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摘要：采用球磨機對鉬尾礦進行機械活化，考察了不同粉磨時間對鉬尾礦粒徑分布、篩余、等效粒徑以及比表面積的變化規律，并將活化后的鉬尾礦用于制備硅酸鈣板，研究了機械活化前后鉬尾礦對硅酸鈣板性能的影響。試驗結果表明，在粉磨初期，隨著粉磨時間增加，鉬尾礦粒徑分布范圍變窄，篩余明顯降低，等效粒徑減小，比表面積增加，制備的硅酸鈣板水化產物托貝莫來石衍射峰強度和硅酸鈣板抗折強度增加；當粉磨時間超過15min后，鉬尾礦粒徑和硅酸鈣板性能變化不明顯。機械活化過程等效粒徑及比表面積與粉磨時間雙對數具有較好的線性相關性。 Abstract: Molybdenum tailings were activated by ball milling to improve the hydration activity under high pressure steam conservation condition. The effect of grinding time on the particle size distribution, sieve residue, equivalent particle size and specific surface areas was extensively investigated. The properties of calcium silicate boards made by mechanical activated molybdenum tailings were studied. The results showed that at the beginning of milling, the particle size distribution became narrow, sieve residue obviously reduced, the equivalent particle size decreased and the specific surface area increased with the increase of grinding time. Furthermore, the diffraction peak intensity of tobermorite formed during the hydration process and the flexural strength of calcium silicate boards increased. The particle size of molybdenum tailings and the properties of calcium silicate boards changed little after fifteen-minute grinding. Both the equivalent particle size and specific surface area of molybdenum tailings showed a good linear relation to double logarithm of grinding time.

戰佳宇,楊飛華,耿春雷,等.鉬尾礦機械活化處理及對硅酸鈣板性能的影響[J].混凝土與水泥制品,2017(6):56-59. ZHAN J Y, YANG F H, GENG C L,et al.Mechanical Activation Treatment of Molybdenum Tailings and Influence of Molybdenum Tailings on Performance of Calcium Silicate Boards[J].China Concrete and Cement Products,2017(6):56-59.

大流動度混雜纖維增強混凝土基本力學性能研究

杜國偉，劉向坤，杜增強，惠建許

２０17年第6期

摘要

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摘要：在纖維總體積摻率不超過1%的情況下，采用鋼纖維、塑鋼纖維以及聚丙烯纖維單摻、雙摻和三摻配制得到了高流動度纖維增強混凝土；通過稠度試驗、抗壓試驗和劈裂試驗，對比分析了纖維混雜方式和纖維混摻比例對基體混凝土工作性能、抗壓強度以及劈裂強度的影響規律。結果表明，在混凝土中摻加0.25%～0.35%的引氣劑可顯著改善混雜纖維增強混凝土的坍落度和坍落擴展度；鋼纖維/塑鋼纖維/聚丙烯三元混雜可顯著提高基體混凝土的抗壓強度和劈裂強度最大分別提高了25%和32.61%。；綜合考慮混凝土工作性能和力學性能，CF60大流動混雜纖維增強混凝土的纖維混摻比例選定為0.6%SF、0.2%HF、0.11%PPF，引氣劑建議摻量為0.35%。 Abstract: With the total volume fraction of the steel fiber below 1%, the hybrid fiber reinforced concrete is prepared by adding steel fiber, steel fiber and polypropylene fiber single, double or triple. Based on the consistency test, compression test and splitting test, the effects of fiber mixing mode and fiber mixing ratio on the working performance, compressive strength and splitting strength of the concrete are analyzed. The results show that the working performance of hybrid fiber reinforced concrete can significantly improve by adding air entraining agent with ration ranging from 0.25% to 0.35%; SF/HF/PPF HFRC can significantly improve the compressive strength and splitting strength of the matrix concrete with 25% and 32.61% respectively. On the basis of the working performance and mechanical property, the most suitable fibers proportion of CF60 is 0.6% SF, 0.2% HF and 0.11% PPF .And the reasonable ratio of air entraining agent is 0.35%.

杜國偉,劉向坤,杜增強,等.大流動度混雜纖維增強混凝土基本力學性能研究[J].混凝土與水泥制品,2017(6):53-55. DU G W, LIU X K, DU Z Q,et al.Research on Mechanical Properties of Hybrid Fiber Reinforced Concrete with High Fluidity[J].China Concrete and Cement Products,2017(6):53-55.

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