第十二期_2014_《混凝土與水泥制品》雜志社

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第十二期

復合助劑改性混凝土的抗硫酸鹽侵蝕性研究

馮紫荻，楊建森，姜曉楠

２０14年第12期

摘要

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摘要：采用正交試驗方法，研究了干濕循環與硫酸鹽侵蝕作用下水膠比、膠粉摻量、硅粉摻量以及消泡劑摻量對混凝土抗硫酸鹽侵蝕性的影響。結果表明，各因素影響混凝土抗硫酸鹽侵蝕性的主次順序是水膠比最大，膠粉摻量次之，硅粉摻量和消泡劑摻量最??；隨著水膠比的增大以及膠粉和硅粉摻量的減小，混凝土的抗硫酸鹽侵蝕性降低；水膠比為0.35，膠粉摻量為8.0%，硅粉摻量為6.0%，消泡劑摻量為0的混凝土抗硫酸鹽侵蝕性最強。干濕循環加劇了硫酸鹽侵蝕的破壞效應，使混凝土的強度和抗侵蝕性降低。 Abstract: The orthogonal experiment method is adopted to study the influence of water-cement ratio, latex powder, silica fume and defoamer on sulfate erosion resistance of concrete under sulfate erosion and dry-wet cycles. The results show that water-cement ratio has the greatest effect on sulfate erosion resistance, next comes latex powder, followed by silica fume and defoamer. With the increase of water-cement ratio, the decrease of content of latex powder and silica fume, the erosion resistant coefficient decreases. The sulfate erosion resistance of concrete is the strongest while the water-cement ratio is 0.35, the content of latex powder is 8.0%, the content of silica fume is 6.0%, and none of defoamer. The combined action of sulfate and dry-wet cycles can cause a further damage on concrete and lead to a decrease of concrete’s strength and sulfate erosion resistance.

粉煤灰對水泥基材料流動性能影響及評價方法研究

徐海源1,2，沙建芳1,2，劉建忠1,2，陸加越1,2，郭飛1,2

２０14年第12期

摘要

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摘要：從需水量比、細度、燒失量、顆粒形貌及吸附性能等方面分析了粉煤灰對水泥基材料流動性能的影響規律。結果表明，粉煤灰需水量比與水泥凈漿流動性能相關性較差，目前采用需水量比來評價其在水泥基材料中流動性能的方法可靠性較低；粉煤灰顆粒形貌對其水泥凈漿流動性能影響顯著，當疏松多孔、層狀結構顆粒較多時，其對減水劑吸附量較高且對水泥凈漿流動性能降低明顯；在分析初始流動度、減水劑種類等實驗參數對水泥基材料流動性能影響的基礎上，提出了粉煤灰性能檢測的有效方法。 Abstract: The influencing factors of the fluidity and appraising means for fly ash are studied in terms of water demand ratio, fineness, fire loss volume，morphological and adsorption properties. The results show that the fluidity of different fly ash is weakly correlated with water demand ratio, which has low reliability to evaluate the fluidity of fly ash. The morphological and adsorption properties of fly ash have strong influence on its flow characteristics by less spherical particles, more loose texture and porous. The measures to evaluate the fluidity of fly ash are proposed, which have the fast and accurate merit under site situation.

低強度等級自密實鋼管混凝土專用外加劑的開發和應用

漆春生1，洪斌1，齊應明2，孫二建3，李超4

２０14年第12期

摘要

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摘??要：通過選用適宜的酯類聚羧酸減水劑母液，采用葡萄糖酸鈉、納米SiO2、有機硅進行復配，研制出一種高減水率、低引氣量、保塑性好、適于低強度等級自密實混凝土的專用外加劑，實現了低膠凝材料用量下混凝土的高流動性與低含氣量的匹配設計。配制C30自密實混凝土時，其最佳摻量為1.2%～1.6%。所配制的混凝土具有良好的工作性能，不離析、不泌水，滿足自密實混凝土泵送施工工藝要求，并成功應用于武漢陽邏港深水薄壁大直徑鋼管樁中。Abstract:Inordertodesignhighfluidityandlowaircontentconcrete,properether-typepolycarboxylatewaterreducermotherliquor,sodiumgluconate,nanosiliciumdioxideandorganosiliconeareusedtoprepareatypeofadmixturewithhighwaterreductionrate,lowairentrainingcontentandgoodslump-retainingproperty,whichissuitableforlowerstrengthgradeself-compactingconcrete.InthepreparationofC30self-compactingconcrete,thebestdosageofthisadmixtureis1.2%～1.6%.Theconcretecontainingthistypeofadmixturehaswellworkability,nosegregationandnobleeding,whichcanmeettheneedofpumpingconstructiontechnologyofself-compactingconcreteandissuccessfullyappliedindeepwaterportwiththinwallandlargediametersteelpipepileinYangluoofWuhan.

多層次視角下薄壁結構混凝土收縮變形影響因素研究

鄭睿

２０14年第12期

摘要

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摘要：薄壁結構混凝土在實際應用中，常存在著混凝土收縮開裂問題，并成為影響混凝土結構實際耐久性與設定功能實現的重要因素。本文以薄壁結構混凝土原材料、配合比與試件尺寸為研究重點，從多個層次視角下探究影響薄壁混凝土收縮變形的因素及其影響規律，為薄壁混凝土施工提供一定的指導。 Abstract: Thin wall structure concrete often has shrinkage cracking problems in practice, which become the important factor affecting actual concrete structure durability and setting function implementation. With raw materials, mix proportion and specimen size as the key points of thin wall structure concrete, the factors affecting shrinkage deformation of thin wall concrete and its influence laws are explored from the perspectives of multiple layers, which can provide a guiding significance for the thin wall concrete construction.

混凝土高整體容器的抗沖擊性能研究

吳浩，姚燕，王玲

２０14年第12期

摘要

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摘要：以纖維增強為技術路線，以沖擊能量吸收為評價指標，研究了不同尺寸特征、不同力學性能的鋼纖維對混凝土抗沖擊性能的改善，并對混凝土高整體容器的現場跌落性能進行了驗證。試驗結果表明，在試驗室及現場的沖擊下，鋼纖維增強混凝土都有較好的整體保持能力，可對處置的核廢料起到很好的包容效果。 Abstract: According to fiber-reinforced theory, a kind of concrete has been prepared with different shape and size metal fibers, and its impact resistance under lab and full size condition has been evaluated based on the energy absorption. The results show that high integrity container (HIC) made with steel fiber reinforced concrete has pretty high shape-keep capacity and excellent protect performance for nuclear waste.

基于微環境影響的混凝土電阻率計算模型

蔣建華，王強強

２０14年第12期

摘要

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摘要：混凝土電阻率是影響混凝土內鋼筋銹蝕速率的重要因素。利用電工學測量方法，研究了水灰比、孔隙水飽和度及氯離子含量對混凝土電阻率的影響規律；并通過試驗數據的回歸分析，建立了基于上述因素影響的混凝土電阻率計算模型，并對計算模型進行了溫度影響修正。 Abstract: The electrical resistivity of concrete is an important factor affecting the corrosion rate of reinforcement in concrete. The effects of water cement ratio, pore water saturation and chloride ion content on the electrical resistivity of concrete are studied using an electrical engineering method. Based on the regression analysis of experimental data, the calculation model of the electrical resistivity of concrete is established with consideration of the above factors, and the model is further improved with the effect of temperature.

高摻量粉煤灰混凝土在干濕循環-碳化耦合作用下的耐久性研究

鄭薇薇1，高建明2，祁兵2，馬立彬2

２０14年第12期

摘要

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摘要：對適用于河道護岸的高摻量粉煤灰混凝土在干濕循環-碳化耦合作用下的耐久性能進行了研究。與單一因素作用相比，在多因素耦合作用下粉煤灰混凝土的質量增加，相對動彈性模量下降，碳化深度也明顯大于標準快速碳化試驗值。采用環境掃描電鏡（ESEM）對粉煤灰混凝土的微觀結構進行了分析。試驗結果表明，多因素耦合作用對混凝土造成了更進一步的損傷；粉煤灰摻量對混凝土在多因素耦合作用下的質量損失及相對動彈性模量有較大影響；摻入粉煤灰后混凝土的抗碳化性能下降。 Abstract: An experimental study on the durability properties of high volume fly ash (HVFA) concrete that is suitable for channel revetment is carried out. The research on durability properties is under carbonation and drying-wetting cycles coupling effects. Compared with the single damage process, the weights of concrete increase and the relative dynamic modulus of elasticity decrease under coupling effects. And carbonation depths are significantly larger than that of the standard carbonation test. Environmental scanning electron microscope (ESEM) is used to investigate the microstructure variation of HVFA concrete. It is revealed that coupling effects cause some damage to the concretes. The incorporation of fly ash has obvious influence on the weight loss and relative dynamic modulus of elasticity. The carbonation resistance of the fly ash concrete is lower than that of the reference concrete.

鋼渣砂在混凝土中的應用研究

謝一飛1，秦瓊2，陳剛3

２０14年第12期

摘要

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摘要：根據建筑用砂和建筑用石標準，對處理后的鋼渣砂進行性能測試和分析。結果表明，經水洗和級配處理后，鋼渣砂滿足建筑用砂石的標準。當鋼渣砂的摻量為50%或取代天然細石子時，砂漿和混凝土的安定性較好。 Abstract: Based on the standards of sand and stone for building, steel slag sand treated is tested and analyzed. The results show that steel slag sand can meet the standard requirements after rinse and graduation. When using steel slag sand to replace 50% of natural sand or fine stones, the stability of mortar and concrete is good.

遠場渦流技術在PCCP斷絲檢測中的應用

徐進1,2，田華2，彭正輝3，朱今祥3，吳燕民3

２０14年第12期

摘要

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摘要：利用遠場渦流變壓器耦合技術可探測預應力鋼筒混凝土管中的鋼絲斷絲現象。介紹了鋼絲斷絲檢測儀的基本原理, 當預應力鋼筒混凝土管出現鋼絲斷絲時會對兩次穿透管壁的遠場渦流信號產生幅度和相位上的畸變,利用這一現象就可以實現對預應力鋼筒混凝土管鋼絲斷絲根數和斷絲位置進行判斷；通過試驗對該方法進行了驗證。 Abstract: By using the Remote Field Eddy Current Transformer Coupling（RFECTC）technology, the broken wire of steel wire in Prestressed Concrete Cylinder Pipe （PCCP） can be detected. Here, the basic principle of a detector for detecting the broken wire of steel wire in PCCP is introduced. When the broken wire of steel wire occurs, the far field eddy current signals across the tube wall two times will generate some amplitude and phase distortion. Using this phenomenon can better realize judgment of the number and position of broken wire of steel wire in PCCP, and the detected method is verified by the experiment.

新型混凝土桿塔應用于無線通信基站的可行性探討及研究

譚洪利，孔珂

２０14年第12期

摘要

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摘要：將傳統混凝土桿塔進行改良，并應用于無線通信行業，特別是結合快裝基礎使用后，具有施工速度快、工程造價低、施工協調難度小、低碳環保等優勢，可在鐵路和高速公路沿線網絡覆蓋、及時處理小區域補點應用中發揮有效的作用，是具有推廣發展潛力的新型通信輔助設施。 Abstract：The traditional circle concrete pole improved can be applied in the wireless communication industry, especially using the new type concrete tower in combination with fast loading basis, it has many advantages such as high construction speed, low cost of manufacture, small construction coordination difficulty and low carbon environmental protection. The concrete tower can play an effective role in along the railway and highway network coverage, timely handling small area to fill some application, so it is a new communication auxiliary facilities to promote development potential.

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