第三期_2015_《混凝土與水泥制品》雜志社

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第三期

粉煤灰基水玻璃混凝土研制及性能探究

王凱1，劉勇健1,2，陳姍姍1

２０15年第3期

摘要

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摘要：以煅燒后粉煤灰為耐酸粉料，水玻璃為膠結料制作耐酸腐蝕砂漿。以不同濃度和種類的酸液模擬酸性介質環境進行酸性腐蝕試驗，參照GB 50212-2014中對于水玻璃混凝土的相關要求，通過檢測試塊抗壓強度及質量損失率確定試塊的耐酸性能。研究得到耐酸腐蝕性能較優的水玻璃砂漿配方，初步驗證了粉煤灰作為耐酸粉料制作水玻璃砂漿的可行性。以掃描電鏡觀察試塊經腐蝕處理后的內部結構，并通過XRD分析其構型，對粉煤灰中各成分與水玻璃所產生的反應進行了討論，得出了以粉煤灰為耐酸粉料的水玻璃砂漿的耐酸機理。 Abstract: The experiment used sodium silicate as the adhesive part of the new cement mortar according to its special principle of solidification. Different kinds and concentrations of acid were used to simulate the acidic condition, and a test on compressive strength and residual weight was used to identify the corrosion resistance of the sample according to GB 50212-2002. An orthogonal test showed that a formula with a best corrosion resistance which proved that using fly ash as acid-resisting powder in sodium silicate cement mortar was practicable. Scanning electron microscope was used to observe the cross profile of the sample, combined with a powder X-ray diffraction (XRD) to analyse its internal structure changes. The statistics showed that fly ash was mainly made up of mullite, which contains Al-O bonds and Si-O bonds, and some metal oxides combined with them, Si-O bonds from sodium silicate made them more stable, their combination improved the concrete’s compressive strength.

石灰石資源全利用混凝土在橋梁工程中的應用研究

劉春1，何智海2

２０15年第3期

摘要

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摘要：針對混凝土橋梁工程的低徐變要求，開展了采用石灰石資源一條龍生產碎石、機制砂和石灰石粉配制的石灰石資源全利用混凝土的試驗和應用研究。結果表明，該混凝土早期強度高于橋梁主梁常用的商品混凝土，但其發展速度較慢，后期強度反而略低于常用商品混凝土；采用復配減縮型高效減水劑有效解決了石灰石資源全利用混凝土徐變較大的技術難題，并在實際橋梁工程中得到了成功應用。 Abstract: According to the requirement of low creep of bridge engineering, the experimental and application research of concrete with total utilization of limestone resources which was prepared by the aggregate, machine-made sand and limestone powder from the limestone resources were studied. The results indicate that the early strength of concrete with total utilization of limestone resources is higher than that of the ready-mixed concrete commonly used for bridge girders, but the strength development speed is relatively slow, so the later strength of the concrete is slightly lower than that of the ready-mixed concrete; shrinkage-reducing superplasticizer can solve the technical problem of concrete with total utilization of limestone resources with higher creep, which has been successfully applied for the practical bridge engineering.

基于XRD對高強混凝土高溫后力學試驗研究

張橋，劉改利，成聰慧，杜紅秀

２０15年第3期

摘要

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摘??要：通過對摻與不摻聚丙烯纖維的高強混凝土進行不同高溫作用后的劈裂抗拉強度、抗壓強度試驗研究，探討高強混凝土劈裂抗拉強度、拉壓比隨溫度變化的規律。研究結果表明，隨著溫度的升高，混凝土中的凝膠體不斷分解，內部結構不斷破壞，高溫后高強混凝土脆性增大，劈裂抗拉強度降低；與未摻纖維的高強混凝土相比，相同溫度作用后摻有聚丙烯纖維的高強混凝土劈裂抗拉強度略有提高，并借助X射線衍射（XRD）試驗，分析高溫作用前后高強混凝土內部成分的變化，初步揭示高溫對混凝土力學性能影響的機理。Abstract:Throughstudyingonsplittingtensilestrengthandthecompressivestrengthofhighstrengthconcretewithpolypropylenefiberandwithoutpolypropylenefiberafterhightemperature,thehighstrengthconcretesplittingtensilestrengthandcompressionratiowiththehightemperatureareanalyzed.Theresultsshowthatwiththetemperatureincreasing,thegelinconcretecontinuousgotdamageandinternalstructureofhighstrengthconcretebegantodecompose,andsplittingtensilestrengthdecreased.Comparedwithdopedfiberhighstrengthconcrete,atthesametemperature’seffect,thesplittingtensilestrengthofhighconcretemixedwithpolypropylenefiberincreasedslightly,andwiththeaidofX-raydiffraction(XRD)test,theinternalcompositionofhighstrengthconcretebeforeandafterhightemperaturewasanalyzed,andthemechanismofhightemperatureoninfluenceofmechanicalpropertiesofconcretewasrevealed.

偏高嶺土對耐熱混凝土基質性能的影響

張俊，李玉香，付玉龍，鄧浩，柯倩倩

２０15年第3期

摘要

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摘要：以d50=1.03μm的偏高嶺土依次取代0、20%、40%、60%、80%和100%的二氧化硅微粉，研究了偏高嶺土對耐火材料基質常溫強度、泛霜性能、熱處理后線收縮率、不同溫度（600℃、800℃和1000℃）的熱處理以及800℃重燒10次后的力學性能。結果表明，偏高嶺土不利于在800℃重燒時基質強度的提高，但偏高嶺土能夠較好地改善基質的泛霜性能，減小基質熱處理后的線收縮率，且在偏高嶺土替代二氧化硅微粉量為40%時，基質具有良好的常溫和熱處理后的力學性能。 Abstract: Aiming at the concrete matrix applied to the heat-resistant craft product, metakaolin（d50=1.03μm）was used to replace silica fume by 0、20%、40%、60%、80% and 100%. These samples were investigated in terms of the strength at room temperature，the efflorescence performance，the shrinkage ratio and the strength after the refractory matrices exposed to different high temperatures(600℃、800℃ and 1000℃), besides, the residual strength was carried out on them at 800℃ by 10 times thermal cycle. Although test results showed that metakaolin did not benefit the improvement of strength of matrix after thermal cycle，it was good for the prevention of efflorescence performance and the decrease of the shrinkage ratio. In addition, when silica fume was replaced by metakaolin at 40% in the matrix, better strength was achieved at room temperature and thermal treatment.

增效劑與減縮增韌劑復摻優化高標號海工大體積混凝土

丁慶軍1，陶瑞鵬1，劉小清1，陳儒發2，劉紅勝2

２０15年第3期

摘要

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摘要：依托港珠澳大橋重點工程，針對該工程預制承臺高標號大體積混凝土水化溫升和海洋服役環境的性能要求，通過復摻CTF增效劑和減縮增韌劑，有效降低了水泥用量和混凝土絕熱溫升，提高了抗裂性能，開發出高耐久低溫升抗裂C45海工大體積混凝土。設計出的混凝土成功應用于港珠澳大橋預制承臺，應用效果良好，沒有出現溫度裂縫。 Abstract: Funded by Hong kong-Zhuhai-Macao bridge major project, in the drive to make the temperature rise of hydration of precast pile high-grade mass concrete and its performance meet the need of marine service environment, by optimizing the composition of cementitious materials and incorporating CTF synergistic agent combined with shrinkage-reducing toughening agent, the cement content and adiabatic temperature rise of this concrete are effectively decreased and its crack resistance ability is increased. High sustainability, low temperature rise and crack resistant C45 marine mass concrete is developed and applied in Hong kong-zhuhai-macao bridge precast pile caps successfully, with a good construction effect and without any temperature crack.

可泵送免壓蒸C80PHC混凝土制備、養護與性能研究

宦文娟

２０15年第3期

摘要

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摘??要：以超細粉煤灰為免壓蒸混凝土摻合料，研究其摻量對混凝土流動性能、力學性能的影響。結果表明，超細粉煤灰摻量低于16%時，混凝土坍落度、脫模強度與其摻量正相關；摻量大于16%時，對其流動性、脫模強度影響不大，甚至降低；摻入超細粉煤灰，混凝土拉壓比提高，脆性降低。所研制的C80PHC混凝土坍落度達150mm，經蒸汽養護（勻速升溫2h、恒溫5h、降溫1h，恒溫溫度85℃）后脫模強度達到79.4MPa，28d抗壓強度達到87.4MPa。Abstract:Ultra-fineflyashwasutilizedastheadmixtureofconcretebynon-autoclavedcuring.Thefluidityandmechanicalpropertiesofconcretewereinvestigatedwithdifferentdosagesofultra-fineflyash.Theresultsshowthattheslumpanddemouldingstrengthofconcreteareinapositivecorrelationwiththedosageofultra-fineflyashlowerthan16%.Theslumpanddemouldingstrengthrarelyincreaseorevendecreasealittlewhenthedosageexceeding16%.Thetensile/compressivestrengthratioincreaseswithflyashduetoareductioninbrittleness.Thedemouldingstrengthand28dstrengthofC80PHCconcretewithaslumpof150mmreachto79.4MPaand87.4MParespectivelyafterasteamingcuring(uniformraisingtemperaturefor2h,constanttemperatureof85℃for5h,loweringtemperaturefor1h).

C60超高層泵送混凝土配合比設計

陳連發1，陳悅2，陸洋3，王辰1

２０15年第3期

摘要

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摘要：將優質山砂與機制砂混合，采用Ⅱ級粉煤灰及S95Ⅱ級磨細礦粉作為礦物摻合料配制C60高性能泵送混凝土。從混凝土的原材料選擇、和易性、經時損失、壓力泌水和抗壓強度等方面進行研究，通過配合比優化設計，配制出了C60超高層泵送混凝土。這不僅解決了高強度等級混凝土粘度與可泵性相矛盾的問題，而且解決了擴展度與粘度的經時損失尤其是泵送損失問題。闡述了C60超高層泵送混凝土的配制關鍵技術，成功將C60混凝土一次泵送至430m高度。同時，提出了高強度等級超高層泵送混凝土可泵性評價的關鍵技術指標，可供有關技術人員參考。 Abstract: High quality hill sand and mechanical sand are mixed, C60 high performance pumping concrete is prepared by using grade II fly ash and grade S95 II levigating slag as mineral admixtures. Fly ash and slag double dosage technology are used to prepare C60 high strength and high performance concrete. Studying from the concrete raw material selection, workability, the loss, pressure bleeding, compressive strength and so on, C60 super high-rise pumping concrete is prepared by the optimization design of mixture ratio. This can not only solve the contradiction between viscosity and pumpability, but also solve the time loss problems of extension degree and viscosity, especially the pumping loss. The key technology of C60 super high-rise pumping concrete preparation is presented, pumping C60 concrete to a height of 430m. The key technical indexes of high strength and super-rise pumping concrete pumpability evaluation is put forward, which is available for related technicians.

試論PHC管樁的蒸養-蒸壓兩次養護工藝

嚴志隆

２０15年第3期

摘要

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摘要：論述了PHC管樁采用蒸養-蒸壓兩次養護工藝的利和弊，并對當前我國采用該工藝和取消蒸壓養護工藝所存在的問題進行了商討。 Abstract：The advantage and disadvantage of two times curing process of steam curing and autoclaved curing for PHC pile, and some problems from using the curing process and canceling the autoclaved curing process in China are discussed

大型智能PC構件自動化生產線簡介

孫紅1，孫健1，吳玉厚1，趙凱軍2

２０15年第3期

摘要

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摘要：根據混凝土工廠化生產的需要，闡述了大型智能PC構件生產線的組成部分、工藝過程和技術重點；分析了該生產線中蘊含的微觀物流、信息采集、分布式控制及多智能體的協同過程，總結了PC構件生產線的優點和技術創新突破點，可為大型智能PC構件全自動生產線的研制提供理論基礎和技術依據。 Abstract: According to the needs of the concrete factory production, the large scale intelligent automatic PC production line the technological process and technical keys of PC component are introduced, the cooperative process of microscopic logistics, information acquisition, distributed control and multi-agent systems are analyzed, the advantages and technology innovation of PC components production line are summarized, which can provide theoretical basis and technical basis for large scale intelligent automatic production line of PC components.

用水泥土引孔的靜壓PHC管樁豎向承載力的試驗研究

李安勇1，張浩2，王月香1，王海1，范存新1

２０15年第3期

摘要

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摘要：對淺部有深厚密實砂層的靜壓PHC管樁的豎向承載力進行了系列試驗研究，包括對常規靜壓樁分別進行靜載和休止后復壓靜載試驗、對用不同水泥土引孔工藝的8根靜壓PHC管樁進行豎向靜載試驗、對12根樁進行高應變動力測試等。研究結果表明，采用改進工藝的水泥土引孔技術能使樁基豎向承載能力大幅度提高，可有效減少樁長，節約費用，且壓樁力顯著降低，施工便捷。此外，低應變動載測試表明，樁身完整性良好、施工質量可靠。 Abstract: Series of study on vertical ultimate bearing capacity of static pressure PHC piles were carried out at a field with thick silty soil layer near underground superficial layers including the static tests to a pile using normal technology of static pressure technology and 8 PHC piles using different cement-soil pile guiding hole technology, high strain tests to 12 piles and so on. The result shows that using the improved cement-soil pile guiding hole technology, the ultimate bearing capacity of the PHC piles significantly increases and the construction efficiency of pile is improved notably compared with those of using the normal technology. In addition, the results of low strain dynamic test on 180 piles show that the pile integrity is high and a considerable expense is also saved in the cost of pile foundation by using the improved cement-soil pile guiding hole technology.

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