2016_2016_《混凝土與水泥制品》雜志社

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2016

磨細鉬尾礦粉用作混凝土摻合料的性能研究

胡家兵1，朱領2，張偉3

２０16年第12期

摘要

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摘??要：在對不同鉬尾礦粉的需水量比及活性測試的基礎上，研究了鉬尾礦粉對混凝土工作性能、力學性能及耐久性的影響。結果表明，當鉬尾礦粉比表面積為547m2/kg時性能最好。在混凝土中替代水泥量不大于10%的條件下，可以改善混凝土工作性，提高混凝土的強度，同時不影響混凝土的抗碳化、抗凍融性能。但隨著磨細鉬尾礦替代量的繼續增加，混凝土的各項性能明顯變差。Abstract:Basedonthetestofwaterdemandandactivityofdifferentmolybdenumtailingspowder,theeffectofmolybdenumtailingspowderontheconcreteproperty,mechanicalpropertiesanddurabilitywerestudied.Theresultshowedthat,theperformanceofmolybdenumtailingwasbestwhenitssurfaceareais547m2/kg.Whenthecementsubstitutionquantitybymolybdenumtailingpowerislessthan10%,theconcretecompressivestrengthandworkabilitycanbeimproved.Meanwhile,ithasnoeffectonanti-carbonizationnorcapabilityfrost-resistance.Thepropertiesofconcretedecreaseastheadditionalquantitykeepincreasing.

富鐵鈦石膏做水泥緩凝劑的試驗研究

肖世玉1,2，呂淑珍1,2，寧美1，張玉蘋1,2

２０16年第12期

摘要

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摘要：利用鈦石膏單摻、鈦石膏與天然石膏復摻制備P·Ⅰ型水泥研究鈦石膏作水泥緩凝劑的可行性。對制備的P·Ⅰ型水泥進行了物理力學性能和水化放熱特性研究，通過XRD、SEM對水泥水化產物的物相和微觀形貌進行了分析。研究結果表明，單摻鈦石膏會增大水泥標準稠度用水量，縮短凝結時間，但其強度與單摻天然石膏試樣強度相當；對于鈦石膏和天然石膏復摻的水泥，隨著鈦石膏摻量增加，其標準稠度用水量增加，凝結時間先增大后減小，在鈦石膏摻量為2.50%時凝結時間最長，強度均先增加后減小，在鈦石膏摻量為1.25%~3.75%時，試樣28d抗壓強度均高于對照組。摻加鈦石膏的水泥安定性合格，標準稠度用水量、凝結時間和強度均符合標準要求。 Abstract: P·Ⅰ cement was prepared by using titanium gypsum and a mixture of titanium gypsum and natural gypsum to study the possibility of making use of titanium gypsum as setting retarders. The basic physical properties and hydration heat characteristics of P·Ⅰ cement were studied. The phases and microstructures of cement hydration products were investigated by XRD and SEM. The results showed that adding titanium gypsum would increase normal consistency, shorten the setting time, and its strength is same as which using natural gypsum. With the increase of dosage of titanium gypsum, the normal consistency of double mixed titanium gypsum and natural gypsum cement increase, and the setting time first increases then decreases. When the titanium gypsum dosage is 2.50%, the setting time reached longest, as the dosage increased from 1.25% to 3.75%, its 28d compressive strength is higher than the control group. The soundness of P·Ⅰ cement with titanium gypsum could meet the demand, the setting time, normal consistency and strength are conform to the standard.

鎳渣制備地面用水泥基自流平砂漿的應用研究

徐風廣，儲晨曦，陳偉峰，侯海軍，吳向東，魏秀秀，蔣軍

２０16年第12期

摘要

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摘要：用鎳渣代替地面用水泥基自流平砂漿中的骨料和填料，研究其對自流平砂漿流動度、耐磨性及抗折抗壓強度等性能的影響。結果表明，鎳渣作為骨料取代天然石英砂應用在地面用自流平砂漿中是完全可行的，鎳渣作為填料具有增加自流平砂漿后期強度的功能，用鎳渣作骨料和填料制備的地面用水泥基自流砂漿具有耐磨性能好、后期強度高、表面不易粉化、價格低等特點，且各項技術指標等均符合JC/T 985—2005標準規定的要求。 Abstract：Nickel slag take the place of the aggregate and filler of the ground cement based self leveling mortar. The influence on the self leveling mortar fluidity, resistance, flexural and compressive strength were studied. The results show that Nickel slag as aggregate replace the natural quartz sand on the ground is feasible, Nickel slag as filler can increase the self leveling mortar late strength, Nickel slag as aggregate and filling to prepare ground with cement based self mortar has good abrasion resistance, high late strength, high surface toughness, low price etc, and each technical indicator can meet the requirements of the JC/T 985—2005 standard.

PCC樁在河岸不良地質條件下的應用研究

高德清

２０16年第12期

摘要

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摘要：結合PCC樁在長江下游某在建船閘工程中的應用情況，在現場對PCC樁施工工藝進行了檢測和試驗研究，探討了混凝土坍落度、拔管速度和充盈系數等重要的施工控制參數對PCC樁質量的影響，總結了PCC 樁施工的關鍵控制技術，為類似工程提供一定的參考和借鑒。 Abstract: Combined with the application of PCC piles in a lock engineering in lower reaches of Yangtze River, the collapse degree of concrete, velocity of pile extraction and fullness coefficient of concrete of PCC piles during construction are studied in detail by experimental research. Based on the test results, the correlative advice about construction controlling and key technique of the PCC pile is put forward.

GB/T 15345—201X《混凝土輸水管試驗方法》國標修訂編制說明

田華，湯文友，于符靜，杜澤

２０16年第12期

摘要

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摘要：本次標準修訂中對GB/T 15345—2003《混凝土輸水管試驗方法》標準的范圍、規范性引用文件、術語和定義、外觀質量、幾何尺寸、水壓、外壓荷載、混凝土強度、保護層砂漿抗壓強度、保護層砂漿吸水率以及管子接頭相對轉角等項目都作了不同程度的修改。為了方便使用新版標準的各類人員加深對各個項目試驗方法的理解，本文基于標準修訂編制說明的內容對新標準的主要變化之處進行了比較完整的說明。 Abstract: Some chapters and sections of the national standard GB/T 15345—2003 "Test methods of concrete pipes for water transmisson" have been revised in different degrees such as scope, normative references, terms and definitions, appearance quality, geometry size, hydraulic pressure, external pressure load, concrete strength, compressive strength of protective cover mortar, water absorption of protective cover mortar, pipe joint relative rotation and so on. In order to facilitate users to accurately implement the specific requirements of the new standard terms and rules, the background, purpose and significance of the new standard are introduced, and the major changes of the new standard are explained.

全輕頁巖陶?；炷翉姸鹊闹饕绊懸蛩匮芯? />
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<a href="/product/1102.html" target="_parent" class="title"><i class="iconfont12"></i>全輕頁巖陶?；炷翉姸鹊闹饕绊懸蛩匮芯?/a>

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<span class="attrValue"><i class="iconfont2"></i> 郝彤1，朱明濤1，于秋波2，姚瑞1</span>
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<span class="attrValue"> ２０16年第12期 </span>
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<span class="newMs">摘要：通過大量的配合比試驗分析了全輕頁巖陶?；炷量箟簭姸鹊闹饕绊懸蛩?，進而確定了全輕頁巖陶?；炷恋淖顑炁浜媳?。試驗結果表明，頁巖陶?；炷量箟簭姸戎饕Q于陶粒本身的筒壓強度、密度等級和粒徑、水灰比、砂率和陶粒是否預濕；與普通混凝土一樣，每一個強度等級都存在一個最優砂率；不同筒壓強度的陶粒只能配制出相應強度等級的頁巖陶?；炷?；與普通混凝土相比，全輕混凝土7d和28d的抗壓強度增長幅度較??；骨料經過預濕的7d和28d的全輕混凝土抗壓強度均低于骨料未預濕的，但骨料經過預濕的混凝土拌合物和易性較好。
Abstract: The main factors of the compressive strength of full lightweight shale ceramsite and sand concrete were analyzed by many mix ratio test to determine the optimum mix proportion. The results showed that the strength of the full lightweight shale ceramsite and sand concrete depends on the strength, density and size of aggregate, water-cement ratio, sand ratio and whether the aggregate is preweting. There is an optimal intensity level sand ratio in each of the strength grade of the full lightweight shale ceramsite and sand concrete. The different strength of aggregate can only prepare corresponding compressive strength of the full lightweight shale ceramsite and sand concrete. Compared with ordinary concrete, the increment of 7d and 28d strength of the full lightweight concrete is smaller. The compressive strength of the aggregates which are not pre-wetted is larger than the pre-wet aggregates, but the pre-wet concrete workability is better.</span>

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自保溫體系用薄層砂漿配方的實驗研究

司政凱1,2，張道令2，陳曉飛2，趙艷艷2，羅忠濤1，楊久俊1

２０16年第12期

摘要

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摘要：薄層砂漿砌筑墻體灰縫厚度低至3~5mm，能有效降低灰縫帶來的能量損失，與蒸壓加氣混凝土自保溫砌塊配套使用能真正實現墻體自保溫功能，而且還可以節省原料使用。文章借助正交實驗方法研究了不同因素對砂漿收縮率、壓折比及黏結強度的影響，為自保溫墻體用薄層砂漿配方研究提供理論依據。結果表明：膠砂比對砂漿各性能影響程度均較高，且隨齡期增長，影響更明顯，而外加劑的加入對砂漿壓折比和黏結強度均有積極意義。 Abstract：The mortar joint thickness of wall which built with film mortar as thin as 3 to 5 mm, which can reduce the energy deficiency caused by gap, and realize self-insulating when it is used with self-insulating autoclaved aerocrete blocks, save materials as well. The influence of different element for the shrinkage, ratio of compressive and flexural strength and sticking strength were studied, which can provide an effective theoretical foundation for the study of film mortar used in self-insulating wall. The results showed that the influence of the ratio of cementitious and sand on the all properties are higher, and more evidence with the time increase; while the admixtures have a positive significance for the ratio of compressive and flexural strength and sticking strength.

稻草纖維粉末混凝土空心砌塊性能試驗研究

韓上尚，蘇有文，陳國平，楊凱

２０16年第12期

摘要

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摘要：通過一系列試驗，得到在同一混凝土配合比下，摻入不同粒徑、不同比例的稻草纖維粉末后混凝土拌合物的物理性能、抗壓強度、抗折強度的變化規律。研究表明，在保證混凝土和易性前提下，隨著稻草纖維粉末摻量的增加，所需水量增加，初、終凝時間延長，稻草纖維粉末混凝土空心砌塊抗壓、抗折強度降低，但在一定的摻量范圍內仍能達到較高強度。 Abstract: Through a series of experiments, the physical properties, the compressive strength, flexural strength of the concrete mixture with different size and different proportions of straw fiber powder were determined under the same concrete mix proportion. The results showed that under same concrete workability, as the increase of dosage of straw fiber powder, water increases, the initial and final setting time extension, straw fiber powder concrete hollow block compressive strength and flexural strength reduce, but with a certain dosage concrete can still achieve higher strength.

不同摻入率混雜鋼纖維對再生混凝土性能的影響

劉慈，崔佳偉，鄧佳卓，裴長春

２０16年第12期

摘要

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摘要：利用粉煤灰、廢棄混凝土再生粗骨料分別代替部分水泥及部分天然粗骨料，拌制基準組再生混凝土，并對基準組再生混凝土改變混雜鋼纖維摻入率，分析了其流動性及力學性能。試驗結果表明，隨著混雜鋼纖維摻入率的增加，混凝土的流動性急劇降低，但對混凝土抗壓強度、彈性模量均有不同程度的增強作用，尤以改善混凝土劈拉、抗折強度最為顯著，并且隨著混雜鋼纖維摻入率的增加，增強作用更加明顯。 Abstract: Fly ash, waste concrete recycled coarse aggregate were used to replace part of cement and the natural coarse aggregate, the reference group of recycled concrete were mixed and the incorporation of hybrid steel fiber was changed on the basic of reference group, its fluidity and mechanical properties were analyzed. The results show that with the increasing incorporation of hybrid steel fiber, the liquidity of concrete reduced drastically, but there are different degrees of increase on concrete compressive strength and elastic modulus, especially in improving the concrete splitting tensile, flexural strength, and with the increase of hybrid steel fiber incorporation rate, this enhancement is more pronounced.

基于彌散旋轉裂縫理論的UHP-FRC三維材料模型

張曉悅1，王棟2

２０16年第12期

摘要

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摘要：基于Rots彌散裂縫理論以及旋轉裂縫理論，在有限元軟件LS-DYNA的UMAT自定義界面采用FORTRAN語言建立UHP-FRC的三維本構材料模型，該模型可以反映材料在拉伸荷載作用下的應變強化現象，而且在復雜的微小開裂過程中裂縫平面可以隨主應力方向的變化而旋轉。利用該本構模型對UHP-FRC材料的直接拉伸試驗和標準梁彎曲試驗進行數值模擬，模擬得到的應力-應變曲線以及荷載-撓度曲線與實驗結果呈良好的一致性，表明所建立的模型可以較為合理地模擬UHP-FRC在拉伸荷載作用下的本構行為。 Abstract: Based on the Rots diffusion fracture theory and Rotation fracture theory, a three-dimensional constitutive material model for the finite element simulation of UHP-FRC is established in the finite element software LS-DYNA by using FORTRAN and the user-defined material model interface. The proposed model considers the special strain hardening period, and the normal directions of the crack planes are coincidee with the principle stress directions during the multiple narrow cracking process. The performance of the proposed model is demonstrated by a direct tensile test as well as a bending test of a standardized beam. The simulated stress-strain curve and load-deflection curve are in good agreement with the experimental results, which suggest that the developed model can reasonably simulate the constitutive behavior of UHP-FRC under tensile loading.

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