第七期_2018_《混凝土與水泥制品》雜志社

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第七期

脫硝工藝對粉煤灰材性影響與安全利用控制技術研究

韓云婷1,2，楊利香1,2，紀晶1,2

２０18年第7期

摘要

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摘要：測試了上海市某電廠普通粉煤灰和脫硝粉煤灰燒失量、強度活性指數、化學組成、礦物組成及微觀形貌等測試，研究了脫硝粉煤灰性能及其與普通粉煤灰的差異，模擬分析了高溫煅燒前后高氮含量脫硝粉煤灰基本性能和力學性能變化。研究表明，正常工況下，采用同一煤種的脫硝粉煤灰的需水量比、燒失量、化學組成、礦物組成類型、外觀以及微觀形貌與普通粉煤灰相似；提出脫硝再燃燒，高氮脫硝粉煤灰經高溫煅燒后燒失量、氮含量、三氧化硫含量分別降低38%、98%和53%，28 d抗壓強度提高7.7%。 Abstract: The ordinary fly ash and denitration fly ash are assessed by testing the loss on ignition, strength activity index, chemical composition, mineral composition and microtopography. The difference of performance between denitration fly ash and ordinary fly ash are systematically analyzed. The basic performance and mechanical properties of the high nitrogen denitrification fly ash are analyzed by high temperature calcination. The results show that the appearance, water requirement ratio, chemical composition, mineral composition and microtopography of denitration fly ash are similar with ordinary fly ash of the same kind of coal under the normal conditions. While the fineness, strength activity index, loss on ignition, nitrogen and sulphur trioxide reflected a slight change from the ordinary fly ash. It is proposed that the loss on ignition, nitrogen content and sulfur trioxide content of high nitrogen fly ash decreased by 38%, 98% and 53% respectively after high temperature calcination by denitration and reburning technology, and the pressure strength of 28 d increased by 7.7%.

韓云婷,楊利香,紀晶.脫硝工藝對粉煤灰材性影響與安全利用控制技術研究[J].混凝土與水泥制品,2018(7):95-100. HAN Y T,YANG L X,JI J.Study on Effect of Denitration on Performance of Fly Ash and the Technology of Resource Security Utilization[J].China Concrete and Cement Products,2018(7):95-100.

分級鐵尾礦砂對石膏基自流平砂漿性能的影響

黃天勇1，2，陳旭峰1，2，章銀祥2，查道安3

２０18年第7期

摘要

引用本文

摘??要：選擇三個級配區域的鐵尾礦砂單獨或者組合替代天然砂制備石膏基自流平砂漿，研究其工作性能和力學性能，并與天然砂制備的石膏基自流平砂漿的工作性能和力學性能進行對比，分析鐵尾礦砂顆粒形貌及顆粒級配對石膏基自流平砂漿的影響機理。結果表明，用0.3～0.5mm、0.1～0.3mm、0～0.1mm三個顆粒級配區域鐵尾礦砂組合全部替代天然砂制備的石膏基自流平砂漿雖然會提高15%用水量，但其工作性能和力學性仍能滿足JC/T1023—2007《石膏基自流平砂漿》對工作性能和力學性能的要求。鐵尾礦砂和天然砂的顆粒形貌差異較大導致了石膏基自流平砂漿流動性降低，調整鐵尾礦砂及整個石膏基自流平砂漿顆粒級配組合可以提高石膏基自流平砂漿的強度。Abstract:Threegradationsofironoretailingsareselectedtopreparegypsum-basedself-levelingmortarforreplacingnaturalsandaloneorincombination.Theworkingperformanceandmechanicalperformanceofthegypsum-basedself-levelingmortararestudied.Themechanismsofparticleshapeandparticlegradationofironoretailingsongypsum-basedself-levelingmortarareanalyzed.Theresultsshowthatthewaterrequirementsofgypsum-basedself-levelingmortarpreparedby0.3～0.5mm,0.1～0.3mmand0～0.1mmironoretailingsincombinationinsteadofallnaturalsandis15%higherthanpreparedbynaturalsand.Theworkingperformanceandmechanicalperformanceofthesurfacemortarforgypsum-basedself-levelingmortarpreparedby0.3～0.5mm,0.1～0.3mmand0～0.1mmironoretailingsincombinationinsteadofallnaturalsandcanmeetrequirementsofstandardJC/T1023—2007Gypsumhasedself-levelingfloorcompound.Thedifferenceofparticleshapebetweenironoretailingssandandnaturalsandleadstothedecreaseoffluidityofgypsum-basedself-levelingmortarpreparedbyironoretailings.Theflexuralstrengthandcompressivestrengthofgypsum-basedself-levelingmortarcanbeimprovedbyadjustingtheparticlegradationofironoretailingssandandgypsum-basedself-levelingmortar.

黃天勇,陳旭峰,章銀祥,等.分級鐵尾礦砂對石膏基自流平砂漿性能的影響[J].混凝土與水泥制品,2018(7):91-94+100. HUANG T Y,CHEN X F,ZHANG Y X,et al.The Influence of Graded Iron Ore Tailing on Properties of Gypsum-based Self-leveling Mortar[J].China Concrete and Cement Products,2018(7):91-94+100.

再生骨料作為輕交通量公路基層材料路用性能研究

文華1，楊濤1，劉穎2，李曉靜1，吳九江1

２０18年第7期

摘要

引用本文

摘要：為研究廢棄混凝土與廢棄磚再生骨料作為輕交通量公路基層材料時水泥穩定建筑垃圾再生骨料混合料的路用性能，進行了不同齡期的無側限抗壓強度試驗、劈裂抗拉試驗和抗壓回彈模量試驗，分析了不同骨料配合比、不同水泥用量對水泥穩定建筑垃圾再生骨料混合料的基本力學性能的影響。結果表明，不同齡期的無側限抗壓強度、劈裂抗拉強度以及抗壓回彈模量受骨料種類和摻入量的影響較大，摻入混凝土再生骨料含量越多，其混合料強度就較高；含磚量越大，強度越低，但仍能滿足現行規范中對基層路用性能的要求。同一種類骨料，水泥用量越高，7 d無側限抗壓強度、劈裂抗拉強度以及抗壓回彈模量也越大。水泥用量的增加可提高混合料的無側限抗壓強度，但高含量的廢棄磚會降低其強度。 Abstract: In order to study the road performance of cement stabilized construction waste recycled aggregate mixture when waste concrete and waste brick recycled aggregate are used as light traffic highway base material, unconfined compressive strength tests, splitting tensile tests and compressive resilience modulus tests are carried out. The effects of different aggregate mix proportion and different cement contents on the basic mechanical properties of cement stabilized construction waste recycled aggregates are analyzed. The results show that the unconfined compressive strength, splitting tensile strength and compressive resilience modulus at different ages are greatly affected by the type and amount of aggregate. The more the content of recycled aggregate, the higher strength of the mixture; the larger the brick content, the lower the strength, but which still meets the current specifications of the road performance requirements. The same type of aggregate, the higher the cement content, the greater 7 d unconfined compressive strength, splitting tensile strength and compressive rebound modulus. The increase of cement content can increase the unconfined compressive strength of the mixture, but the high content of waste brick can reduce its strength.

文華,楊濤,劉穎,等.再生骨料作為輕交通量公路基層材料路用性能研究[J].混凝土與水泥制品,2018(7):87-90. WEN H,YANG T,LIU Y,et al.Research on Road Performance of Recycled Aggregate as Light Traffic Highway Base Materials[J].China Concrete and Cement Products,2018(7):87-90.

大溫差環境下不同養護方式對混凝土橋墩早期開裂的影響

劉德慧

２０18年第7期

摘要

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摘要：通過對大溫差惡劣環境下混凝土橋墩早期水化熱溫度場進行分析，得到外界環境對混凝土結構早期水化熱溫度場的影響。試驗結果表明，大溫差環境下混凝土橋墩早期若無養護會產生較大的溫度應力，易導致溫度裂縫。養護劑養護、土工布養護、橡塑板養護和SAP復合材料養護對這種病害的防護均有不同程度的改善，其中，SAP復合材料養護效果最佳，良好的保溫保濕效果使混凝土橋墩內部溫度場分布更為均勻，具有良好的養護防裂效果。 Abstract: Through the analysis of the early hydration heat temperature field of concrete bridge piers under the bad environment of large temperature difference, the influence of external environment on the early hydration heat temperature field of concrete structure is obtained. The test results show that if there is no curing in the early stage of concrete pier in large temperature difference environment, it will produce large temperature stress and easily lead to temperature cracks. Curing agent curing, geotextile curing, rubber plastic plate curing and SAP composite curing can improved the protection of this kind of disease to some extent. Among them, the curing effect of SAP composite is the best. The good heat preservation and moisturizing effect makes the distribution of the temperature field of the concrete bridge pier more uniform, and has good curing and anti cracking effect.

劉德慧.大溫差環境下不同養護方式對混凝土橋墩早期開裂的影響[J].混凝土與水泥制品,2018(7):83-86. LIU D H.The Effects of Different Curing Methods on Early Cracking of Concrete Piers under Large Temperature Difference[J].China Concrete and Cement Products,2018(7):83-86.

跳倉法在超長大體積混凝土抗裂中的應用研究

胡東康1，趙海濤1，何贈輝2

２０18年第7期

摘要

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摘要：以某氣體絕緣金屬封閉開關設備（Gas Insulated Switchgear，GIS）超長大體積混凝土基礎混凝土抗裂為例，根據工程特點進行了跳倉法的可行性分析，制定了跳倉法的施工方案，采用MIDAS有限元軟件對其施工步驟進行仿真分析。仿真計算結果表明，所有跳倉混凝土施工過程中，其最大拉應力均沒有超過容許抗拉強度，從而驗證了跳倉法施工技術在該工程混凝土裂縫控制方面的可行性。 Abstract: Taking the construction and cracking control of a GIS which has super long mass concrete foundation as an example and according to the characteristics of the project, the feasibility analysis of the alternative bay method construction is made, and the plan of construction is worked out. Then the MIDAS finite element software is applied to simulate the construction steps. The results show that the maximum tensile stress in concrete is no more than the allowable tensile stress, which verifies the feasibility of the alternative bay method construction in the control of concrete cracks in this project.

胡東康,趙海濤,何贈輝.跳倉法在超長大體積混凝土抗裂中的應用研究[J].混凝土與水泥制品,2018(7):79-82. HU D K,ZHAO H T,HE Z H.Application Research on Cracking Control of Super Long Mass Concrete Using Alternative Bay Method[J].China Concrete and Cement Products,2018(7):79-82.

超聲波透射法測試水泥基材料凝結時間研究綜述

楊輝1，2，俞海勇3，李輝1

２０18年第7期

摘要

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摘要：水泥基材料加水攪拌后，隨著水化反應的進行，其狀態從可塑性流體逐漸轉變為具有一定強度的硬化固體，此過程可采用超聲波透射法進行連續、無損監測。通過分析獲得的超聲波信號如波速、振幅等，可解讀出反映水泥基材料的水化進程信息。本文從試驗裝置、測試原理、主要影響因素及凝結時間判斷方法等四個方面介紹了超聲波透射法在測定水泥基材料凝結時間上的研究進展，討論了漿體含氣量對超聲波波速的影響，并分析了現有凝結時間判斷方法的優缺點。 Abstract: After the cement-based material is stirred with water, the state of the cement-based material gradually changes from the plastic fluid to a hardened solid with a certain intensity as the hydration reaction progresses. The process can be continuously and non-destructively monitored by the ultrasonic transmission method. By analyzing the obtained ultrasonic signals such as wave velocity, amplitude, etc., the hydration process information reflecting the cement-based material can be interpreted. The research progress of the ultrasonic transmission method in determining the setting time of cement-based materials is introduced in detail from the aspects of the testing device, testing principle, main influencing factors and judging methods. The influence of the air content of slurry on the ultrasonic wave velocity is emphatically discussed, and the advantages and disadvantages of the existing methods for determining the setting time are analyzed.

楊輝,俞海勇,李輝.超聲波透射法測試水泥基材料凝結時間研究綜述[J].混凝土與水泥制品,2018(7):75-78. YANG H,YU H Y,LI H.Study Review on Setting Time of Cement-based Materials Tested by Ultrasonic Wave Transmission Method[J].China Concrete and Cement Products,2018(7):75-78.

樓板開洞對框架結構整體抗震性能的影響

鄭沛，陳道政，鄧郭毅，李鵬

２０18年第7期

摘要

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摘要：以一棟四層鋼筋混凝土框架結構作為實例，探究了樓板開洞率以及同一結構平面內不同開洞位置對于整體結構抗震性能的影響。采用SAP2000軟件建立8個與該工程實例等效的有限元模型并對其進行模態分析、反應譜分析、Pushover分析和非線性時程分析。分析結果表明，當開洞率大于該層樓面面積的20%且開洞位置偏離結構平面中部時，樓板開洞對于結構整體抗側剛度有較大削弱，同時加大了結構的扭轉效應，在罕遇地震作用下使得結構的屈服機制偏向于“強梁弱柱”。 Abstract: The opening of the floor has an unneglecting influence on the seismic performance of the frame structure. A four-story RC concrete frame structure is taken as an example. In order to study the impact of floor opening rate and the same plane structure in different position of opening the seismic performance of the whole structure, the SAP2000 software is used to establish 8 equivalent models to make modal analysis, response spectrum analysis, Pushover analysis and nonlinear time history analysis. The results show that when the opening rate is greater than 20% and the location of the opening deviates from the middle part of the structure, the opening of the floor has a great influence on the overall seismic performance of the frame structure.

鄭沛,陳道政,鄧郭毅,等.樓板開洞對框架結構整體抗震性能的影響[J].混凝土與水泥制品,2018(7):69-74. ZHENG P,CHEN D Z,DENG G Y,et al.The Influence of Slab with Opening on Overall Seismic Performance of Frame Structure[J].China Concrete and Cement Products,2018(7):69-74.

泡沫混凝土孔結構特征及其影響因素研究進展

張旭1,2，王武祥2，楊鼎宜1，張磊蕾2

２０18年第7期

摘要

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摘要：多孔結構是泡沫混凝土的重要技術特征，對泡沫混凝土性能和功能產生決定性的影響。本文簡要介紹了泡沫混凝土孔結構形成機理、特征參數、主要影響因素及其對泡沫混凝土力學性能、熱工性能、吸水性和抗凍性影響的研究進展，指出有關泡沫混凝土孔結構特征及其對宏觀性能的影響研究明顯滯后于其新產品研發進度，應加大研究力度。提出進一步探明孔結構對泡沫混凝土宏觀性能的影響將會積極推進泡沫混凝土配合比優化設計、制造和應用，促進泡沫混凝土的高效、規?；瘧?。 Abstract: Porous structure is an important technical feature of foamed concrete and it has decisive influences on the performance and function of foam concrete. The forming mechanism, characteristic parameters, main influencing factors and the research progress of pore structure of foamed concrete and its influence on the mechanical properties, thermal properties, absorbency and frost resistance of foamed concrete are introduced. At the same time, it points out that the research on characteristics of pore structure of foamed concrete and its influence on macroscopic performance is obviously behind the research progress of its new products, and should be intensified. Further investigation of the effect of pore structure on the macroscopic performance of foam concrete will promote the mix ratio optimum design, manufacture and the efficient and scale application of foam concrete.

張旭,王武祥,楊鼎宜,等.泡沫混凝土孔結構特征及其影響因素研究進展[J].混凝土與水泥制品,2018(7):63-68. ZHANG X,WANG W X,YANG D Y,et al.Characteristic on Pore Structure of Foamed Concrete and Study Development of Its Effecting Factors[J].China Concrete and Cement Products,2018(7):63-68.

預制V型腹板PSRC梁的擬靜力試驗研究

邱文建1，邵永健1，翁曉紅2，張炎1，李杰麟1

２０18年第7期

摘要

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摘要：為了研究預制型鋼混凝土梁的抗震性能，試驗研究了4根預制V型腹板的型鋼混凝土梁，研究參數主要有剪跨比和現澆板混凝土強度。研究結果表明：預制V型腹板PSRC梁具有良好的的抗震性能，其V型疊合面沒有出現剝離和滑移現象；試件的力學性能受剪跨比的影響較大，剪跨比越大，試件的耗能、延性、變形恢復能力越好，但是承載力和剛度降低；現澆板的混凝土強度越高，構件的承載力、剛度、耗能性能也隨之提高，但延性下降。 Abstract: In order to study the seismic performance of prefabricated steel reinforced concrete, four kinds of V-shaped prefabricated steel reinforced concrete are tested. The parameters are mainly shear span ratio and the strength of cast-in-place concrete. The results show that the V-shaped PSRC beam has good seismic performance, and the V-shaped laminated surface has no peeling and slip phenomenon. The shear span ratio has a great influence on the mechanical properties of the PSRCL. With the increase of shear span ratio, the restoring force for deformation, ductility and energy consumption of the specimen are higher, but the rigidity and the bearing capacity is declined. When the strength of cast-in-place concrete, the bearing capacity, rigidity and energy consumption of the specimen increase, but the ductility of the specimen decreases.

邱文建,邵永健,翁曉紅,等.預制V型腹板PSRC梁的擬靜力試驗研究[J].混凝土與水泥制品,2018(7):58-62. QIU W J,SHAO Y J,WENG X H,et al.Experimental Research on Pseudo-static Test of Prefabricated V-shaped PSRC Beams[J].China Concrete and Cement Products,2018(7):58-62.

不同種類纖維對海工混凝土力學性能的影響

王登科，曾藝卓，張海東，陳宏哲

２０18年第7期

摘要

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摘要：為了研究纖維種類對混凝土力學性能的影響，以C40海工混凝土為研究對象，考察了玄武巖纖維、聚丙烯纖維、碳纖維、仿鋼纖維對混凝土抗壓強度、抗拉強度、極限拉伸應變的影響規律，同時與不摻纖維的基準混凝土對比。結果表明，玄武巖纖維、聚丙烯纖維、碳纖維對混凝土的抗壓強度以及抗拉強度影響不大，仿鋼纖維的摻入均會造成抗拉強度以及抗壓強度的明顯下降；碳纖維對混凝土極限拉伸應變提高最大，其次是玄武巖纖維、聚丙烯纖維，仿鋼纖維最差。 Abstract：In order to study the effect of fiber type on mechanical properties of marine concrete, basalt fiber, polypropylene fiber , carbon fiber and steel imitation fiber are added into the C40 marine concrete, and the compressive strength,tensile strength and ultimate tensile strain are investigated and compared with these of original concrete. The results show that basalt fiber, polypropylene fiber and carbon fiber have little effect on the compressive strength and tensile strength of concrete, while both the tensile strength and the compressive strength are obviously reduced by the adding of steel fiber. The ultimate tensile strain of concrete mixed with carbon fiber is the greatest, followed by basalt fiber, polypropylene fiber, and the worst of steel imitation fiber.

王登科,曾藝卓,張海東,等.不同種類纖維對海工混凝土力學性能的影響[J].混凝土與水泥制品,2018(7):55-57. WANG D K,ZENG Y Z,ZHANG H D,et al.Effects of Different Types of Fiber on Mechanical Performance of Marine Concrete[J].China Concrete and Cement Products,2018(7):55-57.

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