2013_2013_《混凝土與水泥制品》雜志社

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2013

石灰石中氟磷灰石對水泥熟料燒成和強度的影響

史美潔，鄧敏，謝禮蘭，湯金輝

２０13年第1期

摘要

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摘要：研究了非洲一種石灰石中的氟磷灰石對水泥生料的易燒性、熟料礦物組成、礦物形貌和強度發展的影響。結果表明，在1300℃和1350℃時，隨著熟料中P2O5含量的增加，氟磷灰石對生料易燒性改善顯著；在1400℃和1450℃時，熟料中P2O5含量的增加對生料易燒性改善不明顯。熟料中P2O5含量為0.05%~1.50%時，熟料礦物相中A礦較多，礦物晶形發育良好。熟料中P2O5含量為2.00%~5.00%時，A礦形狀不規則，大小不均勻。隨著熟料中P2O5含量的增加，熟料中C3S、C3A和C4AF含量趨于減少，水泥3d強度和28d強度都逐漸降低。熟料中P2O5含量為0.05%~1.50%時，生產出的水泥均可滿足42.5級普通硅酸鹽水泥國家標準中對強度的要求。結合生料易燒性、熟料礦物巖相及水泥強度實驗分析認為，熟料中P2O5含量宜控制在1.50%以內。 Abstract: Effects of fluorapatite in limestone from Africa on burnability, mineral composition, mineral morphology and compressive strength of the clinker are analyzed. It is found that with the increase of the P2O5 in clinker, the effect of fluorapatite on improving burnability of raw meals is positive and significant at 1300℃ and 1350℃, and not obvious at 1400℃ and 1450℃. The content of C3S, C3A and C4AF in clinkers decrease with the increasing of the P2O5 content. When the content of P2O5 in clinker is between 0.05% and 1.50%, the significant amount of well-developed alite is formed. When the content of P2O5 in clinker is between 2.00% and 5.00%, alite is mainly irregular and inhomogeneous. The strengths of cement pastes at 3d and 28d would have a gradual decline with the increasing of the P2O5 content. When the content of P2O5 in clinker is not more than 1.50%, cements produced may meet the strength requirements of 42.5 Portland cement national standards. It is analyzed that the amount of P2O5 in clinker should not be more than 1.50% combined with burnability of raw meals, microstructure of the clinker and strength of the cement.

補償收縮納米SiO2鋼纖維混凝土抗沖擊性能試驗與分析

崔云，馬芹永

２０13年第1期

摘要

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摘要：通過正交試驗研究單摻納米SiO2、單摻鋼纖維以及雙摻納米SiO2與鋼纖維對補償收縮混凝土抗沖擊韌性的影響。根據美國ACI544委員會推薦的試驗方法，采用自行設計的自由落錘沖擊試驗裝置。研究表明，單摻鋼纖維會明顯增強補償收縮混凝土的抗沖擊韌性，雙摻納米SiO2和鋼纖維后，抗沖擊韌性增強效果更佳。與未摻納米SiO2相比，鋼纖維摻量為0.8%、1.2%、1.6%時，抗沖擊能量差最大分別可提高31.9%、24.5%和33.7%，鋼纖維摻量不超過1.2%時，納米SiO2的最佳摻量是0.6%。 Abstract: Through orthogonal experiment, the impact toughness of the shrinkage compensating concrete by adding nanometer SiO2, steel fiber and adding nanometer SiO2 and steel fiber at the same time is studied. According to the United States ACI544 committee recommended test methods, the self-designed free falling hammer impact test device is used. The research results show that adding steel fiber will significantly enhance the impact toughness of shrinkage compensating concrete, double doped nanometer SiO2 and steel fiber, the enhancement effect will be better. Compared to no adding nanometer SiO2, when the steel fiber volume rate is 0.8%, 1.2% and 1.6%, the impact resistance energy difference between failure and initial crack will reach 31.9%, 24.5% and 33.7% at largest. When the steel fiber volume rate is no more than 1.2%, the optimum amount of nanometer SiO2 is 0.6%.

石灰巖質機制砂混凝土收縮徐變試驗研究

徐以艷，張耀庭，鄭怡

２０13年第1期

摘要

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摘要：進行了石灰巖質機制砂的主要材性及配合比試驗，并在自然環境下，對石灰巖質機制砂混凝土梁進行了收縮、徐變試驗，根據實測數據，擬合出機制砂的收縮、徐變時程關系表達式；并將其與國內外幾種常用的收縮、徐變模式進行了對比分析。結果表明，配筋率對混凝土收縮應變和徐變撓度系數有一定程度的影響；ACI-209及本文擬合的公式與試驗結果更為接近。 Abstract: The material properties and mix proportion experiments of the limestone mechanism sand concrete are carried out. And under the natural environment, the shrinkage and creep tests of the limestone mechanism sand concrete beams are processed. According to the practical data, the shrinkage and creep relational expressions are fitted out, and several existing prediction models of creep and shrinkage are compared and analyzed. The test results show that the reinforcement ratio has a certain degree of influence on the concrete shrinkage strain and creep coefficient, and the ACI-209 model and this paper’s fitting formula are better close to the experimental results.

超高強鋼筋接頭灌漿料的試驗研究

高安慶，朱清華，化子龍

２０13年第1期

摘要

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摘要：研究了礦物摻合料、硬骨料、高效減水劑等對超高強接頭灌漿料各項性能的作用和影響，采用復合膨脹劑提高了該接頭灌漿料的早期膨脹性能。通過試驗得到了一種28d抗壓強度可達110MPa以上、具有較高流動度和理想膨脹率的高強鋼筋接頭灌漿料。 Abstract: The influences of mineral admixtures, hard aggregates, superplasticizer on the properties of the ultrahigh strong joint grouting material are researched. The complex expansion agent is used to improve the early expansion of the joint grouting material. Through the experiment, the ultrahigh strong joint grouting material for the steels is prepared with the 28d compressive strength up to 110MPa, high fluidity and ideal expansion rate.

ASTM C1202電通量法與氣體滲透法對比試驗研究

侯旭良1,2，王中平1,2

２０13年第1期

摘要

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摘要：通過對不同灰砂比、不同組分配合比的水泥砂漿分別進行ASTM C1202電通量法與氣體滲透試驗，探討兩種方法在應用中的選擇取舍問題。結果表明，水泥砂漿的抗滲性能與水膠比和摻合料種類聯系密切。對于水膠比大的水泥砂漿，兩種試驗方法下結果具有良好的相關性；而對于水膠比較小的水泥砂漿，可選用氣體滲透法。未摻加摻合料的砂漿可采用電通量法測定氯離子滲透性來評價，而摻加摻合料的砂漿宜選用氣體滲透法來檢測其抗滲性，應用中需綜合分析選用。 Abstract: ASTM C1202 test of electric flux and gas permeability testing method are adopted to the cement mortar of different cement-aggregate ratio and different mix proportion. The purpose of the experiment is to explore the appropriate method in the application. It is showed that the permeability of cement mortar is closely related to the water-cement ratio and admixture varieties. As to the cement mortar of high water-cement ratio, the results of these two methods bear good relativity and the gas permeability method can be applied to that of low water-cement ratio. The permeability of cement mortar without admixtures can be evaluated by electric flux method while the gas permeability test could be used to detect the cement mortar with admixtures. The two methods should be selected according to practical conditions.

礦物摻合料對C100混凝土早期收縮及干縮的影響

徐仁崇，李曉斌，桂苗苗，江達宣

２０13年第1期

摘要

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摘要：研究了復摻情況下，礦物摻合料種類及摻量對C100高強混凝土早期收縮及干燥收縮的影響。結果表明，混凝土的早期收縮和干燥收縮隨著粉煤灰摻量的增加逐漸減少，粉煤灰對早期收縮的抑制作用優于干燥收縮；隨著礦粉摻量的增加，混凝土的早期收縮增大而干燥收縮減少；硅灰的摻入增大了混凝土的早期收縮與干燥收縮，且隨著硅灰摻量的增加，這種作用更加明顯。 Abstract: Effects of category and dosage of mineral admixtures on the early age and drying shrinkage of C100 high strength concrete with mixing condition are investigated. The results indicate that the early age and drying shrinkage will decrease with the increase dosage of fly ash, and the effect on reducing early age shrinkage is better than that of reducing drying shrinkage. The early age shrinkage will increase and the drying shrinkage will decrease when the dosage of ground granulated blast furnace slag increases. Silica fume can increase the early age and drying shrinkage of concrete, and the effect will be more obvious when the increasing dosage of silica fume.

管樁新型自動化生產工藝及生產線介紹

曾曉文

２０13年第1期

摘要

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摘要：針對國內預應力混凝土管樁生產工藝流程的現狀及生產工藝特點，提出了一種新型的預應力混凝土管樁生產工藝，從而設計出一條自動化程度較高的預應力混凝土管樁生產線，并詳細介紹了該生產線的特點和不足之處。 Abstract：The current situation and characteristics in production process of domestic prestressed concrete piles are analyzed. And a new production process of prestressed concrete piles is put forward. Then, base on it, a highly automatic production line for prestressed concrete piles is designed. The characteristics and shortcomings of the new production line are also introduced in detail.

高性能地鐵混凝土管片的配合比設計及性能研究

喻振賢1，李匯1，管品武2，鄭娟榮2，揚小龍2

２０13年第1期

摘要

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摘要：基于骨料最緊密堆積理論，提出了高性能地鐵混凝土管片的配合比設計原則及計算步驟，通過試驗確定了配合比計算中的相關參數。研究結果表明：與具有相同原材料的地鐵管片混凝土相比，高性能地鐵管片混凝土具有漿體體積用量更小，28d抗折強度、劈裂抗拉強度和彈性模量更高（即抗裂性好）、耐久性好、性價比高等性能。 Abstract：Based on the theory of the most compact of aggregates, the principle and calculating steps of mix proportion design of high-performance concrete for subway tunnel segments are put forward, and the correlated parameters in calculating steps of mix proportion design are also determined by experiment. The research results show that the paste volume is smaller, and the bending strength, splitting tensile strength and elasticity modulus of concrete cured 28 days are higher for the concrete for high-performance subway tunnel segments compared with the concrete produced by the enterprise with the same raw materials.

礦物摻合料對錨桿砂漿改性及試驗研究

謝江南，譚躍虎，戴銀所，李二兵

２０13年第1期

摘要

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摘要：選用普通硅酸鹽水泥、砂、石膏、鋁礬土等來研制早強微膨脹高性能錨桿注漿材料。采用正交試驗，并用極差法對試驗結果進行分析，得出以下結論：1d、3d、14d抗壓強度和抗折強度分別達到17MPa、38MPa、61MPa和4.9MPa、7.5MPa、9.1MPa。1d豎向膨脹率為0.089%，屬于微膨脹，后期膨脹較穩定，可以有效避免由于漿體收縮引起的錨桿失效。此外，利用SEM、XRD和壓汞儀對硬化漿體微觀結構進行表征，發現1d時硬化漿體中就有大量的鈣礬石生成。 Abstract: A new type of anchor grouting material with early strength, micro-expansion and high performance by using Portland cement, sand, gypsum, bauxite, etc. is developed. The orthogonal test and range analysis method for analyzing the experiment result are used. The analytic results demonstrate that the compressive strength of the mortar is 17MPa、38MPa、61MPa and the flexural strength is 4.9MPa、7.5MPa、9.1MPa at 1d, 3d and 14d age. The expansion ration is 0.089%, which belongs to micro-expansion and its volume is stability after 14 days, and then it could avoid the damage of anchor resulting from the shrinkage of mortar. It is characterized by SEM, XRD and MIP, and the result shows that it appears a lot of ettringite in hard mortar at 1d.

纖維優化對纖維水泥基復合材料應變硬化性能的影響

牛恒茂1，3，邢永明1，趙燕茹2，米力4

２０13年第1期

摘要

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摘要：介紹了纖維增強水泥基復合材料（FRCC）取得應變硬化行為的微觀力學模型，在該模型指導下，綜述與分析了纖維類型、強度、長度、直徑、體積摻量及纖維表面處理等因素變化對FRCC應變硬化能力的影響。研究成果表明，纖維優化能夠穩定取得應變硬化行為或得到更大的應變硬化能力。 Abstract: The micromechanics models, which provide an opportunity to obtain strain-hardening behavior in fiber reinforced cementitious composites(FRCC), are introduced, and the effect of the fluctuation of fiber type, strength, length, diameter, volume content and fiber surface treatment on the properties of strain-hardening based on micromechanics models is summarized and analyzed. The research results indicate that the fiber optimization can improve the robustness of strain-hardening and achieve better capacity of strain-hardening.

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