2009_2009_《混凝土與水泥制品》雜志社

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2009

堿性環境中粉煤灰活性與表面反應特征研究

王迎斌，馬保國，羅忠濤，李相國，張慢

２００9年第1期

摘要

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摘??要：在飽和Ca(OH)2環境下研究了溫度、時間及粉煤灰粒度對低鈣粉煤灰的活性率及水化粉煤灰顆粒表面微觀形貌的影響。結果表明,在本文實驗條件下，隨溫度的升高，粉煤灰的活性率增加，但并不存在線性的增加效應，在60℃～80℃區間粉煤灰活性率有較大的躍升；在80℃飽和石灰水環境下，粉煤灰活性率與反應時間呈線性增加的關系；在飽和石灰水中可以充分分散的前提下，粉煤灰的活性率與其本身的細度相關性較小。Abstract：Theeffectoftemperature,ageandthefinenessofpowdersofflyashonitsactivityratioandthesurfacemicrofeatureofhydratedflyash,atthealkalineenvironmentwithsaturatedlimewater,wasstudied.Theresultsshowthatalongwiththeraisingoftemperature,theactivityratioofflyashisincreasing,buttheraisingvalumsarenotinthelinear,theactivityratioofflyashhasaultrarisefrom60℃to80℃.Intheenvironmentofsaturatedlimewaterat80℃,therelationshipbetweenactivityrateandageofreactionislinear,i.e.theageincreasing,theratioincreasing,however,thereislessinterrelationshipbetweenactivityratioandthefinenessoffly-ashwhenflyashpowderswillbesufficientlyseparatedinsaturatedlimewater.

水泥基自流平砂漿流動性與保水性的試驗研究

彭家惠，董素芬，黃智德

２００9年第1期

摘要

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摘要：研究了減水劑、纖維素醚、砂的細度模數、灰砂比及木質纖維對水泥基自流平砂漿流動度經時性和保水性的影響。試驗結果表明：減水劑在摻量飽和點附近時，100min流動度經時損失最小，為4mm，保水性則達到89.2％；纖維素醚摻量宜選擇0.05％，對應的100min流動度經時損失為6mm，保水性可達97.2％；砂的細度模數在0.9~1.6之間、灰砂比大于1：1.6時，水泥基自流平砂漿有較好的流動性和保水性；木質纖維對水泥基自流平砂漿的流動度經時性和保水性不存在有利影響。 Abstract：The influences of water-reducer、cellulose ether、fineness modulus of sand、 cement-sand ratio and wood fiber on the performance of cementitious self-leveling mortar, the fluidity loss and water preservativeness, are studied by tests. The results show that，when the content of water reducer is nearly to the saturation point，the fluidity loss at 100min can reach the least value of 4mm and the water prpservation rate can reach 89.2％；as the suitable concent of HPMC is 0.05％，the corresponding fluidity loss at 100min is 6mm and the water preservation rate can reach 97.2％; when the fineness modulus of sand is between 0.9 to 1.6 and the cement-sand ratio is above 1：1.6, the cementitious self-leveling mortar will have better fluidity and water preservativeness. Wood fibre have no beneficial effects on the fluidity loss and water preservativeness of cementitious self-leveling mortar.

羥丙基甲基纖維素醚對特細砂水泥砂漿性能的影響

張建新，彭家惠，李青，李志坤，白冷

２００9年第1期

摘要

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摘要：研究了羥丙基甲基纖維素醚（HPMC）對特細砂水泥砂漿的保水性、施工性、強度及塑性開裂的影響，分析了HPMC粘度、細度對砂漿保水性的影響規律。結果表明，HPMC可顯著提高砂漿保水性、粘聚性、抗流掛性，使砂漿抗拉強度、粘結強度明顯提高；同時，HPMC可有效抑制砂漿塑性裂縫的形成，降低塑性開裂指數；砂漿保水性隨HPMC粘度增加而提高，當HPMC粘度超過40000 MPa·s后，保水性不再明顯增加；HPMC的細度對砂漿保水率也有一定的影響。 Abstract: The influences of hydroxypropyl Methylcellulose ester (HPMC) on water retention, workability, strength and plastic cracking of cement mortar are studied by testing. In addition, the influential tendency of HPMC viscosity and fineness on the water retention capacity of mortar was investigated. The results indicate that the addition of HPMC will increase the water retention, cohesion and sagrigational resistance of mortar significantly, and will improve its tensile strength and bonding strength, and will prevent form forming of plastic crack effectively. Besides, the water retention of mortar is increased with the enhancing of HPMC viscosity and will not do so when HPMC viscosity is in excess of 40000 MPa·s. The suitable dosage and viscosity of HPMC are 0.1%~0.2% and 40000 MPa·s respectively.

水生植物、多孔混凝土的綜合水質凈化效應

朱健，高建明，汪吉星

２００9年第1期

摘要

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摘要：研究了水生植物鳳眼蓮、美人蕉和黃花水龍的水質凈化功能，以及這三種水生植物與生態型多孔混凝土復合應用時對被污染水質的凈化效果。試驗結果表明，從整體上看，當這三種水生植物分別與多孔混凝土復合應用時，其水質凈化效果均有明顯提高，其中黃花水龍對水質凈化效果最好。 Abstract： The purification of water quality by the aquatic plants, such as Canna, Eichhornia crassipe and Jussiaen repens, has been experimentally studied, as well as the purification by the combined action of the aquatic plants with porous concrete has been studied. The results showed that the effect of water purification by Jussiaen repens is the most effective; and with the combination of porous concrete the water purification will indicate more efficient than that of only using aquatic plants.

鋼筋對混凝土徐變影響的計算

黃浩良1，王佶1，范劍鋒1，喻立志2，顏巖1

２００9年第1期

摘要

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摘要：鋼筋在荷載作用下的變形時效性與混凝土不同，這便在一定程度上改變了混凝土的徐變。因此，為了盡可能精確地計算混凝土的徐變，必須考慮鋼筋的影響。從力學角度出發，鋼筋混凝土構件與相同尺寸的素混凝土構件在相同的荷載作用下，兩者的變形差異是由鋼筋對混凝土的附加內力導致的。根據混凝土徐變計算公式以及相應的力平衡條件與位移協調條件，可以推導出考慮鋼筋影響的混凝土徐變計算公式。此外，文章還以實例驗證了公式的正確性。 Abstract: Because of the time-effectiveness of deformations for concrete and steel bar, under the same loading, is defferent, so the creep of concrete will be changed to a certain extent by the reinforcing bars. In order to accurately calculating the creep, it is necessary to consider the influence of reinforcing bars. In fact, the different deformations of concrete with and without steel bar is caused by the additional internal force between reinforcing bars and concrete. And based on that the force is in equilibrium, and the deformation is in coordination, the method of creep calculation in this article is deduced

不同摻合料對堿-硅反應的抑制及比較研究

饒美娟，方坤河

２００9年第1期

摘要

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摘要：在摻合料對堿-硅反應的抑制機理基礎上，根據不同礦物摻合料對堿-硅反應的抑制試驗結果，比較并分析了四種摻合料對堿-硅反應的抑制效果。結果表明，硅粉對混凝土堿-硅反應的抑制效果最好，當硅粉摻量為15%時，抑制率可超過90%；粉煤灰和石灰石粉的抑制效果次之，而礦渣的抑制效果相對較差。 Abstract: Besed on the mechanism of restrainting the alkali-silica reaction by using of mineral admixtures, the effects of four admixtures have been compared experimentally. The rezults show that the best one is silica fume, its long time's restrainting rate can be over 90% when the content of it is in 15%, and the effects of fly ash and limestone powder are in second-rate, while the slag powder is the worst one.

再生混凝土集料對水泥穩定碎石性能的影響及工程應用

孫家瑛1，蔣華欽1，劉綏芳2，李麗霞2

２００9年第1期

摘要

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摘??要：作為道路基層的水泥穩定碎石，其性質在很大程度上依賴混合料的組成級配[1]。在探討集料組成對水泥穩定碎石強度影響的同時，對再生混凝土集料的特性和將其用于水泥穩定碎石的效果進行了探索性研究。結果表明，再生混凝土集料特別是再生混凝土細集料對水泥穩定碎石強度的影響很大。適當級配的再生混凝土集料可以制備出強度發展良好、耐久性能優異的水泥穩定碎石，并能在高等級公路施工中推廣運用。Abstract:Toagreatextent,thestrengthofcementstabilizedgravelisdependedontheirgrandingcomposition,andthathasbeenstudiedexperimentallybyusingrecycledconcreteaggregateforpatiallyreplacethenaturalaggregate.Therezultsshowthattherecycledconcreteaggregate,especiallytheirfineparticle,hasagreatinfluencesonstrengthofcementstabilizedgravel.Andwhenthegradingissuitable,itisabletoprepareacementstabilizedgravelwithhighstengtyandgooddurability.

附著式風動振動器在一階段管生產中的應用

倪志權，倪靖珂

２００9年第1期

摘要

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摘要：介紹了在一階段管生產中采用附著式風動振動器作為成型主要設備的成型裝置、工藝方法及其成型效果。

預應力混凝土軌枕的設計計算

白玲，汪加蔚

２００9年第1期

摘要

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摘要：以TZⅡ型軌枕為例，介紹了預應力混凝土軌枕的結構及設計計算方法，包括設計荷載、軌枕截面疲勞承載能力、極限承載能力、抗裂性的計算以及試驗荷載的確定等。

年產10萬套纖維水泥電纜管工藝線可行性研究

李連科，孫友慶，孫國偉，孫浙堅

２００9年第1期

摘要

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摘要：就建設年產10萬套纖維水泥電纜管生產線的可行性進行了研究，介紹了“抄取法”制管生產工藝的特點，提出了年產10萬套纖維水泥電纜管主要設備和配套設施的具體要求，并進行了經濟效益分析。

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