第八期_2015_《混凝土與水泥制品》雜志社

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第八期

水泥品種對鉆孔灌注樁混凝土耐久性的影響

陳波1，白銀1，劉雪娟2，張文瀟1，寧逢偉1

２０15年第8期

摘要

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摘要：為了確定同時受硫酸鹽強腐蝕作用和氯離子強腐蝕作用的鉆孔灌注樁混凝土的水泥品種，考察了普通硅酸鹽水泥、高抗硫水泥及Ⅱ型硅酸鹽水泥對鉆孔灌注樁混凝土的耐久性影響。分別研究了評價抗硫酸鹽侵蝕性能的抗壓強度耐蝕系數、砂漿膨脹系數和砂漿抗折強度抗蝕系數，以及評價抗氯離子侵蝕性能的氯離子遷移系數、氯離子擴散系數和電通量。結果表明，與采用普通硅酸鹽水泥相比，采用高抗硫水泥與Ⅱ型硅酸水泥的混凝土抗硫酸鹽侵蝕性能沒有明顯提高；普硅水泥混凝土的抗氯離子侵蝕性能要優于高抗硫水泥混凝土和Ⅱ型硅酸鹽水泥混凝土。在硫酸鹽與氯離子雙重強腐蝕作用下，普硅水泥制備的高性能鉆孔灌注樁混凝土具有良好的耐久性。 Abstract: In order to determine cement types for bored pile concretes which are suffered from strong sulfate attcak and serious chloride corrosion, the effects of cement types on bored pile concretes durability are investigated. Three ordinary Portland cements, one sulfate resistance Portland cement and one type Ⅱ Portland cement are selected. Sulfate attack resistance properties, i.e. concrete compressive strength corrosion coefficient, mortar expansion coefficient and mortar flexural strength corrosion coefficient, chloride corrosion resistance properties, i.e. chloride migration coefficient, chloride diffusion coefficient and electric flux, are tested respectively. The results show that concrete with sulfate resistance Portland cement and type Ⅱ Portland cement have no significant improvement on sulfate attcak resistance when compared with ordinary Portland cement. On the other hand, concrete with ordinary Portland cement remarkably improve the chloride resisting property than the concretes with the other two types of cement. With coupling effect of sulfate attack and chloride corrosion, high performance bored pile concrete with ordinary Portland cement has more excellent durability.

混凝土拌合物中氯離子含量快速測試方法的對比研究

林志翔，桂志偉，孫蓓

２０15年第8期

摘要

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摘要：為尋找一種能快速測試混凝土拌合物中水溶性氯離子含量的方法，采用硝酸銀滴定法、氯離子選擇電極法和氯離子速測條法，分別對使用硅酸鹽水泥及摻礦粉和粉煤灰配制的C30和C50混凝土拌合物中水溶性氯離子含量進行了測試和綜合評估。結果表明，三種測試方法在測試精度上沒有太大區別，但用氯離子速測條法測試速度快、操作簡便、不需要復雜的儀器和大的初期投資，更適合在施工現場使用。 Abstract: In order to finding out a method which can quick test the water-soluble chloride ion in fresh concrete, three kinds of methods were used, such as the silver nitrate titration, chloride ion selective electrode method and chloride ion test strip method. C30 and C50 concrete mixed with Portland cement and fly ash or blast-furnace slag, were tested and integrated assessment. The results showed that these test methods had little difference in the accuracy. However, the chlorine ion test strip method was fast, simple, and didn’t require complex equipment and big initial investment, which was more suitable for the construction site.

相變控溫混凝土機場道面強度與溫度場數值分析

杜春志，劉兵飛，何翔宇

２０15年第8期

摘要

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摘要：隨著國內民航業的快速發展，機場場道的除雪化冰已成為急需解決的問題之一，特別是北方機場和高原機場?；谙嘧儍δ懿牧虾凸δ芴荻仍O計思想，首先將場道按功能要求設計成三層，在此基礎上對升溫層厚度、埋深、熱傳導系數等因素對場道強度和溫度影響因素進行了數值分析。結果表明：埋管深度對結構的強度影響較??；埋管深度對溫度場影響較大，埋深越深，表面層溫度越低，不利于融雪化冰；表面層導熱系數對融雪化冰影響較大，導熱系數越大，高于5℃的溫度持續時間越長，對融雪化冰非常有利。 Abstract：With the rapid development of civil aviation industry, snow-melting and deicing of pavement has been one of the issues needed to be resolved, especially in north and plateau airports. The phase change and energy storage concrete pavement has been designed as three-layer structure like ‘sandwich’ by the means of the principle of functionally graded materials(FGM), the effects of the thickness and buried depth of heating layer and the heat conductivity coefficient on the strength and temperature of pavement had been numerical analyzed. The results show that the effects of buried depth of heat pipelines are smaller on the pavement strength, the buried depth of heat pipelines affected the temperature of the pavement greatly, that is the temperature is lower in surface layer as the buried depth is deeper, and the heat conductivity coefficient of surface layer has great effect on performance of snow-melting and deicing of pavement, the greater the heat conductivity coefficient, the more time of temperature beyond 5℃ kept, which is very benefit for snow-melting and deicing.

砂子級配對砂漿沖蝕磨損性能的影響

趙彥華，王彥平，王起才

２０15年第8期

摘要

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摘要：處在強風沙流地段的混凝土結構會受到強風挾帶沙粒的的沖蝕磨損，造成混凝土結構耐久性的降低。本文采用氣流挾沙噴射法模擬戈壁風沙流環境，對不同砂子級配砂漿進行沖蝕磨損試驗，研究沖蝕參數及砂子級配對砂漿沖蝕磨損性能的影響。試驗結果表明，不同砂子級配砂漿在各沖蝕速度下，90°沖蝕時沖蝕率最高，而30°沖蝕時沖蝕率最低，與傳統脆性材料的沖蝕規律相一致。砂漿試樣所用砂子的級配影響其沖蝕率，砂漿試樣所用砂子的級配越小，則其沖蝕率越大，級配越大，則其沖蝕率越小。不同砂子級配砂漿短期內的沖蝕機制主要為選擇性沖蝕。 Abstract: The concrete structure are seriously eroded by grains of sand carried by strong winds, causing the durability of concrete construction to reduce. In this paper, the erosion wear test of mortar samples with different sand grading were carried out by grit-blasting experiments, and the effect of impact parameters and sand grading on the mortar erosion wear were investigated. The results show that under different erosion speed for mortar samples with different sand grading, erosion rates were highest at 90° impact, and lowest at 30° impact, which was consistent with traditional brittle material erosion laws. The sand grading affect erosion rate of mortar samples, erosion rates were highest for low sand grading, and lowest for high sand grading. The erosion wear mechanism of mortars is selective erosion wear in the short term.

再生混凝土工程應用及性能監測研究

謝云飛1,2，李智慧3

２０15年第8期

摘要

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摘要：目前，對再生混凝土在結構工程中研究較多集中于實驗室試驗，在實際工程中應用研究鮮有案例。本文結合具體工程，配制再生混凝土，并將再生混凝土應用于工程典型構件，在360d齡期下進行長期應變監測，并與相似受力狀態的普通混凝土構件對比，以分析再生混凝土的受力性能。 Abstract: Nowadays, the research of recycled concrete are more concentrated in the laboratory test when there are few cases in the practical engineering. Based on detailed project, recycled concrete is configured and applied in typical components in this paper. During the age of 360d, long-time strain monitoring is done and the results are compared with those of ordinary concrete with similar status to give stress performance analysis.

自養護材料對高強膨脹混凝土性能的影響及機理分析

賈麗莉，趙日煦，吳雄，黃義雄，彭園，楊龍

２０15年第8期

摘要

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摘要：試驗通過在高強混凝土內部引入自養護材料的方法，以達到降低混凝土自收縮，實現高強膨脹混凝土內養護的目的。通過采用高分子自養護材料SAP，研究了不同摻量及摻加方式對高強混凝土工作性能、力學性能和膨脹性能的影響，并分析其作用機理。SAP的最佳摻量為1‰，持續增加會顯著降低工作性能、力學強度和膨脹性能；SAP采用附加水的方式摻入混凝土有利于提高混凝土膨脹性能，兼顧力學性能，其附加水量不宜過大。 Abstract: In order to achieve the purpose of reducing the self shrinkage of concrete and self-curing of high strength expansive concrete, the self-curing material is used into concrete. The effects of different dosage and mixing method on the workability, mechanical properties and expansive properties of high strength concrete are studied by using SAP. The best dosage of SAP is 1‰, and constantly adding SAP will significantly reduce the workability, mechanical strength and expansive properties of concrete. Using additional water mixed into concrete for SAP can improve the expansive properties and the mechanical performance of concrete, and the additional water content should not be too much.

利用蒸壓釜冷凝水制備C80混凝土

蔣元海1，梁俊2，谷志攀1

２０15年第8期

摘要

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摘要：將PHC管樁生產過程中蒸壓釜冷凝水以一定比例替代混凝土攪拌用水，試配C80新拌混凝土，測定新拌混凝土的工作性和蒸養混凝土抗壓強度及蒸壓混凝土抗壓強度。試驗結果表明，用蒸壓釜冷凝水制備的新拌混凝土，其混凝土坍落度可以滿足管樁生產要求，蒸養混凝土強度可以達到60MPa以上，蒸壓混凝土強度達到80MPa以上，分析了冷凝水配制混凝土強度增長的機理。 Abstract: Using autoclaved kettle condensation water instead of concrete mixing water to prepare C80 concrete for the PHC pile production, the workability of fresh concrete and the concrete compressive strength after steam curing and after autoclaved curing are tested. The test results indicate that the slump of the fresh concrete prepared by using autoclaved kettle condensation water can meet the requirements of pile production, the concrete strength can reach more than 60 MPa after steam curing, and the concrete strength reached more than 80 MPa after autoclaved curing. And then, the mechanism of concrete strength growth with condensation water is analyzed.

影響PHC管樁泵送混凝土性能的因素研究

張建綱1,2，毛永琳1,2，劉金枝1,2

２０15年第8期

摘要

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摘要：基于泵送工藝生產PHC管樁對混凝土的技術要求，研究并探討了礦物摻合料的種類、混凝土水膠比、含氣量以及外加劑對混凝土的和易性和蒸養強度的影響，提出了滿足PHC管樁泵送生產的混凝土關鍵原材料的選擇及技術指標控制范圍。 Abstract：Based on the technical requests of PHC pile produced by pump concrete method，mineral admixture type，water binder ration，air content，and chemical admixture are studied and discussed. The method of choosing key materials and several main specifications are put forward to satisfy the producing process.

高性能減水劑在C80免壓蒸管樁中的應用

付長紅1，馮金之1，王樹峰2

２０15年第8期

摘要

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摘要：介紹了適用于高強免壓蒸管樁的JC-700高性能減水劑的制備、性能及其在該類管樁中的應用情況，并與傳統萘系減水劑所配制的管樁進行了對比。結果表明：采用JC-700高性能減水劑所配制的管樁強度更高，外觀更光潔。此外，還研究了石子含泥量對管樁混凝土和易性和抗壓強度的影響。 Abstract: Preparation, properties and application of JC-700 high performance water reducing agent for non-steam autoclaved C80 high-strength concrete pile are introduced. Compared with piles with traditional naphthalene series water reducing agent, piles with the JC-700 water reducing agent have higher strength and more beautiful appearance. In addition, the influence of mud contents of stones on the workability and compressive strength of pile concrete is studied.

預制混凝土砌塊護坡應用技術探討

鄭繼，張成銀，劉長順

２０15年第8期

摘要

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摘要：闡述了國內外對預制混凝土砌塊護坡應用技術的研究現狀，并針對目前國內外研究現狀及工程中存在的問題，探討了預制混凝土砌塊護坡應用技術的研究內容及方法，可為進一步制定預制混凝土砌塊護坡應用方面的技術規程提供理論依據。 Abstract：The research status of precast concrete blocks slope protection application technology at home and abroad are elaborated. For domestic and foreign research status and existing problems in engineering, the research contents and methods of precast concrete block slope protection about the application techniques are discussed, which can provide a theory basis for formulating technical regulations of precast concrete block slope protection in application technology aspect.

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