第十二期_2015_《混凝土與水泥制品》雜志社

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第十二期

全再生細骨料對砂漿性能影響的實驗研究

楊醫博1,2，雷灝軒1，郭文瑛1，鄭志勤1，王恒昌1，鄭子麟1，林仙杰1，歐陽雄新1，黃錦炫1，潘洲池1，黃玉清1

２０15年第12期

摘要

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摘要：傳統再生細骨料需水量大、強度低，較難利用，將廢棄混凝土全部破碎成細骨料的全再生細骨料技術能有效提高再生細骨料性能。在前期研究基礎上，進行了全再生細骨料對砂漿性能影響的研究。結果表明，在同樣砂漿稠度的情況下，全再生細骨料砂漿的綜合性能優于傳統再生細骨料砂漿，與機制砂砂漿和河砂砂漿相近，可全取代機制砂或河砂用于制備砂漿；全再生細骨料具有較好的保水性能，用其配制砂漿時可較河砂和機制砂適當降低保水劑用量。 Abstract: The tranditional recycled fine aggregates has large water demand, low strength, and difficult to use, all recycled fine aggregate technology that is brocken waste concrete into fine aggregatecan, improve the performance of recycled fine aggregate. Based on the previous research, the influence of all recycled fine aggregate on mortar performance is studied. The results show that under the condition of the same mortar consistency, the comprehensive performance of the all recycled fine aggregate mortar is superior to the traditional recycled fine aggregate mortar, which is similar with manufactured-sand mortar and river sand mortar, all recycled fine aggregate mortar can fully replace the manufactured-sand mortar or river sand to prepare mortar. The all recycled fine aggregate has good water retention performance, the dosage of aquasorb can be appropriatly decreased for preparing mortar by using all recycled fine aggregate, compared with river sand and manufatured sand.

隧道盾構施工旋挖樁隔離效果分析

孫延盼，邵永健

２０15年第12期

摘要

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摘要：為分析隧道盾構施工時旋挖樁對減少鄰近建筑物位移的效果，以蘇州地鐵4號線工程蘇州火車站站至北寺塔站區間的一棟三層框架結構為例，對隧道盾構施工過程中的地表沉降進行了實測，并采用有限元軟件ABAQUS建立三維彈塑性模型，模擬了隧道盾構施工過程中在有無旋挖樁隔離兩種情況下該建筑物的水平和沉降變形，對兩種情況下建筑物的變形進行了對比分析。分析結果表明，隧道盾構施工過程中，旋挖樁能有效地隔斷樁內外的地表變形，明顯減少盾構施工引起的鄰近建筑物沉降。相對于無旋挖樁隔離，有旋挖樁隔離時建筑物的柱底水平位移減少56.2%左右，豎向沉降位移減少67.6%左右。 Abstract: To analyze the isolation piles of reducing the effect on the displacement of adjacent buildings as shield tunneling, as an example of the reinforcing result of a three-layer frame structure of Suzhou Subway Line 4 between Suzhou railway station and Beisita station, surface settlement is measured in shield tunneling process. Three-dimensional elastoplastic model is established by using the finite element software ABAQUS, that the horizontal deformation and settlement deformation in both cases whether the isolated pile of neighboring buildings are simulated in shield tunneling process, a comparison analysis on deformation of the building under two different working conditions is carried out. The results indicate that, in the process of shield tunneling, swivel-driven pile can effectively cut off the pile surface subsidence within and outside, shield construction is reduced by causing building deformation of neighboring buildings. Relative to without swivel-driven pile, swivel-driven pile can reduce 56.2% bottom horizontal displacement for building, which can also reduce 67.6% vertical displacement sedimentation.

新型裝配式建筑構件生產及其施工技術的研究與應用

范玉1，4，徐華2，黃新3，黃繼戰4，馬北京4

２０15年第12期

摘要

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摘要：通過對建筑PC構件的設計、生產、施工進行的研究，對建筑PC構件進行了再設計及優化，確定了合理的PC構件生產及其施工工藝方案，并對影響PC構件質量的相關因素進行了分析。 Abstract: Through the research on design of PC component, production and construction, construction PC component is carried out for re-design and optimization. The reasonable PC component production and construction technology program are determined, and factors affecting the quality of PC are analyzed.

鋼絞線自動穿束切割機

袁俊華，張金芳

２０15年第12期

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摘要：結合鋼絞線穿束機的現狀，介紹了鋼絞線穿束機定長盲割的市場需求和實用價值。并基于大量實測數據，選出性能相對優良的被動檢測輪材質及由編碼器、PLC、變頻器綜合組成的智能化控制系統，使所研制的切割機具有較強的自動化程度。 Abstract: According to the current situation of the steel wire threading machine, the market demand and practical value of the steel wire cutting machine are introduced. Based on a large number of measured data, the intelligent control system which is composed of the encoder, PLC and frequency converter is selected, which reflects the great automation technology of the wear beam machine.

鈦礦渣對泡沫混凝土性能的影響研究

馬林, 何順愛

２０15年第12期

摘要

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摘??要：利用普通硅酸鹽水泥與鈦礦渣，采用物理發泡工藝在水料比0.35的條件下，制備了泡沫混凝土，并結合XRD、SEM對鈦礦渣泡沫混凝土微觀結構及組成進行了分析，同時研究了鈦礦渣微粉摻量對泡沫混凝土氣孔、抗壓強度及收縮的影響。研究表明，鈦礦渣摻入促使泡沫混凝土氣孔變大；鈦礦渣取代15%水泥制備的泡沫混凝土干密度為517.0kg/m3，56d抗壓強度增長22.5%，為3.8MPa，56d收縮降低36.5%，減小到2.45mm/m。Abstract:ByusingordinaryPortlandcementwithtitaniumslag,foamconcreteispreparedbyadoptingphysicalfoamingprocessundertheconditionofwatermaterialratioof0.35,andmicrostructureandcompositionoftitaniumslagfoamedconcreteareanalyzedwhichiscombinedwithXRDandSEM,meanwhile,theinfluenceoftitaniumslagpowdercontentonfoamconcreteporosity,compressivestrengthandshrinkageisanalyzed.Theresultsshowthat,foamconcreteporositybecomelargerwithmixedtitaniumslag;drydensityoffoamconcreteis517.0kg/m3whichispreparedbytitaniumslagtoreplaceof15%cement,56daycompressivestrengthis3.8MPawithincreasing22.5%,56dshrinkageis2.45mm/mbydecreasing36.5%.

基于正交試驗的石膏復合砌塊材料基本力學性能研究

李紅飛，馮勇，晉強，何金春

２０15年第12期

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摘要：用石膏部分替代水泥作為膠凝材料，鋼渣、礦渣作為摻合料，采用正交試驗設計方法，將石膏、水膠比、減水劑在三因素四水平的影響下，對砌塊的抗壓強度、抗折強度及軟化系數進行了極差和方差分析；采用多元線性回歸分析方法建立基于抗壓強度、抗折強度及軟化系數的經驗公式，并利用建立的抗壓經驗公式計算結果與實測值進行了對比。結果表明，石膏是影響復合砌塊抗壓強度、抗折強度及軟化系數的主要因素，水膠比次之，減水劑影響程度最小。通過分析得出最佳水平為：石膏用量60%，水膠比0.4，減水劑1.1%。 Abstract: Gypsum partly replacing cement as cementitious material, steel slag and slag as admixture, design method is applied by orthogonal experiment, compressive strength of block, flexural strength and softening coefficient is analyzed by range and variance under the influence on three factors and four levels of gypsum, water-cement ratio and water reducing agent. Multiple linear regression analysis method is established by based on empirical formula of compressive strength, flexural strength and softening coefficient, and calculation results by using empirical formula is compared with measured values. The results show that, gypsum is the main factors of affecting compressive strength, flexural strength and softening coefficients of gypsum composite block, followed factor is water-cement ratio, the minimum effecting degree is water reducer. By analyzing the optimum level is 60% amount of gypsum, 0.4 amount of water-cement ratio and 1.1% amout is superplasticizer.

承重型橫孔連鎖混凝土砌塊的技術特點及應用前景

張敬書1,2，張偉鵬1,2，趙俊1,2，王麗1,2，劉樂1,2

２０15年第12期

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摘要：介紹了承重型橫孔連鎖混凝土砌塊的技術特點，該砌塊具有抗壓強度高、砌筑效率高、保溫隔熱性能好、技術要求低等優點，適用于在村鎮地區的建筑中應用，承重型橫孔連鎖混凝土砌塊符合國家基本國情和政策要求，應用前景良好。 Abstract: The technology characteristic of horizontal-hole interlocking concrete hollow block for load-bearing walls is introducted. The block have many advantages with high compressive strength, speed construction process, good heat insulation, few technical requirements, which is suitable for application in village area.The horizontal-hole interlocking concrete hollow block for load-bearing walls comform basic national conditions and national policy requirements, and have good application prospect.

混凝土疊合板的板端受剪承載力分析

張家竣1，鄭毅敏1,2，趙勇1

２０15年第12期

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摘要：混凝土疊合板的預制底板外伸鋼筋會給其制作和安裝帶來不便，但是否可以取消預制板底外伸鋼筋存在爭議。根據中國和美國的現行相關標準，建立了疊合板板端可能出現的受剪破壞模式及相應的受剪承載力計算公式，并通過算例分析了未留設預制底板外伸鋼筋時，疊合板跨度、活荷載與后澆層最小厚度的關系。 Abstract: Precast slab of concrete composite bottom protruding bars can bring inconvenience to the fabrication and installation. The problem whether the precast slabs cancel its bottom protruding bars or not is worth to be discussed. According to current standards in China and the United States, the possible shear failure modes and the calculating formula of relative shear capacities were proposed, through the precast slab elements without bottom protruding bars, the relationships among the span of composite slab, the value of live load and the minimum thickness of composite layer were analyzed through some calculating examples.

多尺度超高韌性水泥基復合材料力學性能試驗

夏正兵1，蔣東升2

２０15年第12期

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摘要：基于水泥基復合材料多尺度的結構特征，設計了一種由聚乙烯醇（PVA）纖維以及碳酸鈣晶須增強的新型多尺度超高韌性水泥基復合材料（Mutil Scale- Ultra High Toughness Cementitious Composite，簡稱MS-UHTCC），并研究了16組MS-UHTCC配比的抗壓強度和單軸拉伸性能，探討了晶須和PVA纖維對水泥基的增強機理。結果表明：晶須的摻入可提高UHTCC的抗壓強度、延性及抗拉強度, MS-UHTCC在單拉作用下表現出明顯的應變硬化行為和多縫開裂模式，利用碳酸鈣晶須和國產PVA配制廉價MS-UHTCC具有可行性。 Abstract: Based on structure characterastic of multi-scale cementitious composites, a new kind of multi-scale ultra high toughness cementitious (MS-UHTCC) is designed by polyvinyl alcohol (PVA) fiber and calcium carbonate whisker. the compressive strength and mechanical properties uniaxial tension are studied through 16 series of MS-UHTCC proportions, and reinforced mechanism of PVA fiber and whisker on cementitious are discussed. The results indicate that the compressive strength, ductility and tensile strength of MS-UHTCC are enhanced by adding whisker, strain-hardening behavior and multiple cracking patterns of MS-UHTCC are achieved under uniaxial tension. The cheap MS-UHTCC is proposed by using CaCO3 whisker and domestic PVA fiber, which is feasible.

PVA纖維增強水泥基材料尺寸效應及相關性能研究

朱長書1，孫林柱2，王雨1，孫磊2，楊芳2

２０15年第12期

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摘要：為研究PVA纖維增強水泥基復合材料尺寸效應及相關力學性能，試驗設計了27組不同配合比，測定了不同尺寸、不同纖維含量試件的28d抗壓、軸壓和抗折強度。結果表明，立方體抗壓試件之間存在尺寸效應，且尺寸越小越明顯。試件抗折強度隨著PVA纖維摻量的增加而增大，但增大趨勢逐漸減緩。試驗建立了不同纖維摻量下，軸心抗壓與立方體抗壓強度之間的數值模型。 Abstract: In order to study the size effects and related mechanical properties of PVA fiber reinforced cementitious composite material, the experiments for 27 different groups with different mix proportion are designed, different dimension, 28d compressive strength for different fiber dosage, axial compressive strength and flexural strength are detemined, and related datas are obtained. The results show that cube compressive specimens exist size effect, the size is smaller, the effect is more obvious. With the increasing of PVA fiber content, flexural strength increases, however, the increasing trend gradually slow down. And the experiment of numerical model is established between axial compressive strength and the cube compressive strength under the different fiber content.

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