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    蘇州混凝土水泥制品研究院有限公司

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    第四期

    超低水膠比及硅灰對水泥凈漿早期自收縮的影響
    超低水膠比及硅灰對水泥凈漿早期自收縮的影響
    • 葛曉麗1,劉加平1,2,3,王育江3,田 倩3,楊 斌3
    2016年第4期
    摘要
    引用本文
    摘 要:采用自行研制的波紋管測試系統,測試超低水膠比水泥凈漿的早期自收縮;并通過測試毛細管負壓和水化程度,對自收縮結果進行分析,定性闡述超低水膠比水泥凈漿的自收縮機理及規律。結果表明,當水膠比低于0.18時,水泥凈漿的自收縮隨水膠比的減小而降低;反之則增加;當水膠比為0.18(臨界水膠比)時,水泥凈漿的自收縮最大。硅灰可以很好地抑制超低水膠比水泥凈漿的自收縮,當水膠比為0.15,硅灰摻量為5%和10%時,水泥基材料48h的自收縮分別降低了25.8%和56.3%。 Abstract: Early autogenous shrinkage of cement paste with very low W/B was measured with self-designed corrugated tubes. According to the capillary pressure and hydration progress, the early autogenous shrinkage was analyzed. Meanwhile, mechanism of early autogenous shrinkage was qualitatively presented. The results show that the autogenous shrinkage of cement paste decreases with the reducing of W/B in the case of W/B≤0.18, while a contrary tendency is presented when W/B is over 0.18; a critical W/B of 0.18 is observed in which autogenous shrinkage of cement paste would reach maximum. Silica fume is effective to restrain the early autogenous shrinkage of cement paste with very low W/B. When the W/B is 0.15 and the contents of silica fume are 5% and 10%, the autogenous shrinkage would decrease by 25.8% and 56.3% after 48h.
    引氣劑與凹凸棒土對新拌混凝土觸變性能的影響研究
    引氣劑與凹凸棒土對新拌混凝土觸變性能的影響研究
    • 劉 競
    2016年第4期
    摘要
    引用本文
    摘 要:高速鐵路曲線段超高混凝土底座板的形態控制是無砟軌道底座混凝土施工控制難點,針對曲線段超高底座板混凝土在凝結前無法有效保持與定型,導致超高不滿足要求及排水坡度不能順利實現等難題,以混凝土動態處理時(如:泵送、澆筑、振搗)具有良好流變性能,靜態放置時(如:抹坡、收坡后)具有良好形態保持能力為目標,通過新拌混凝土坍落度、含氣量、屈服應力、坡度保持能力等室內試驗以及現場工程試用,研究了引氣劑、凹凸棒土等礦物摻合料對混凝土觸變性能的影響。結果表明,引氣劑與凹凸棒土雙摻加入,充分發揮了引氣劑在漿體引入大量微型氣泡的滾珠、潤滑作用與凹凸棒土凝膠在漿體中的纖維狀結構與取向網絡分布的束縛、托舉的復合作用,提高新拌混凝土靜態屈服應力至10.28N·m、降低動態屈服應力至5.47N·m,增加靜/動態屈服力矩比至1.9,改善混凝土坡度保持能力至95.6%?,F場試用情況表明,在泵送壓力無明顯增加情況下,引氣劑與凹凸棒土雙摻混凝土硬化后底座超高坡度保持率93%以上,明顯優于單摻引氣劑的混凝土。 Abstract: The elevation control of concrete bottom slab in curve line section of high-speed railway is difficult because fresh concrete cannot hold its shape and the slope of fresh concrete cannot maintain effectively before concrete hardening. To solve this problem, air-entraining agent and attapulgite clay were used to improve the thixotropy of fresh concrete. Results indicated when air-entraining agent and attapulgite clay incorporated simultaneously, the static yield stress of fresh concrete increased (10.28N·m), the dynamic yield stress decreased (5.47N·m), the ratio between the static and dynamic yield stress increased (1.9), and the ability of holding the shape and slope was improved (95.5%). Moreover, the pumping pressure was not increased obviously. The slope-holding rate of concrete bottom slab in curve line section on site reached more than 93% with air-entraining agent and attapulgite clay simultaneously added which was significantly better than that of fly ash concrete. This is mainly due to fibrous gel structure and orientation distribution of attapulgite clay and spherical air bubbles incorporated by air-entraining agent in fresh cement paste. These will provide valuable and useful references for quality control of concrete bottom slab in curve line section of ballastless track.
    砂漿-花崗巖界面過渡區的劈裂拉伸試驗研究
    砂漿-花崗巖界面過渡區的劈裂拉伸試驗研究
    • 陳 興,盧玉斌,滕 驍,蘇 實
    2016年第4期
    摘要
    引用本文
    摘 要:從細觀層次看,骨料周圍水泥砂漿即所謂的界面過渡區(Interfacial Transition Zone,簡稱ITZ)的形貌、成分、密度等特征與水泥砂漿基體顯著不同。由于ITZ往往被看成混凝土中的“薄弱環節”,其性能在很大程度上影響著混凝土的宏觀力學性能。本文采用巴西圓盤劈裂法,設計一定寬度的弧形墊條,以形成2α=20°的平臺對含界面的砂漿-花崗巖試樣進行準靜態劈裂拉伸試驗??紤]試樣的不同直徑、不同砂漿強度、不同長徑比、不同應變率及花崗巖骨料表面不同粗糙度等多種因素對界面拉伸強度的影響。采用正交分析法對試驗數據進行系統分析。同時,在劈裂拉伸試驗中,結合散斑圖像采集系統對劈裂試驗過程中試樣表面的圖像進行實時采集,從而獲得試樣在加載過程中的破壞形式與形態。 Abstract: From the mesoscopic level, cement mortar around the aggregate, a so-called Interfacial Transition Zone (Interfacial Transition Zone, ITZ), its morphology, composition and density and other characteristics are significantly different from the cement mortar matrix’s. Since the ITZ is usually considered to be the "weak link" in concrete, its performance affects the macroscopic mechanical properties of concrete to a large extent. In this paper, the Brazilian disc splitting method is used, and a certain width of arc pad article was designed to form a 2α=20° platform for the quasi static splitting tensile test of containing interface mortar-granite samples. In the test, the diameter of samples, mortar strength, length-diameter ratio, strain rate and surface roughness of granite aggregate and other factors’ effects on the interface tension strength were all researched. Orthogonal analysis method was applied to systematically analyze the experimental data. Meanwhile, in the splitting tensile test, a speckle image acquisition system was used, realized real-time acquisition for surface images of the sample in order to obtain the destruction pattern and form of samples in the loading process.
    AMPS/NNDMA共聚物和聚羧酸系分散劑在油井水泥中的性能研究
    AMPS/NNDMA共聚物和聚羧酸系分散劑在油井水泥中的性能研究
    • 溫 虹1,王偉山2,鄭柏存2
    2016年第4期
    摘要
    引用本文
    摘 要:以不同摩爾比的AMPS/NNDMA二元線性共聚物降失水劑和聚羧酸系分散劑(PCE)作為主要外加劑,研究了其對油井水泥漿抗濾失、流變、稠化、固結等性能的影響。試驗結果表明,少量的AMPS/NNDMA共聚物就能有效控制水泥漿抗濾失性能;降失水劑使水泥漿流變性變差,但加入分散劑可大大改善體系流變性;同時兩種外加劑復配有一定緩凝作用且稠化時間可調,水泥石強度也滿足施工要求;隨著NNDMA在降失水劑中含量的增加,水泥漿體系失水量、游離液含量減少,稠度增加,流變性和水泥石強度變差。 Abstract: Different mole ratio of AMPS/NNDMA binary linear copolymer fluid loss reducer and PCE dispersant as the main additives, the oil well cement slurry filtration resistance, rheology, thickening, the influence of consolidation are studied.The results show that the AMPS/NNDMA copolymer under little amount can effectively control the slurry filtration performance and free fluid content. Fluid loss reducer made the bad slurry rheological property, the dispersant can greatly improve the rheological property. With high temperature and high pressure thickening the consistency of cement slurry and thickening time, experiments show that additive offers certain retarding action and adjustable thickening time. By cement compressive strength test, the results show that under the reasonable dosage, cement strength also satisfies the requirement of construction. The increasing of NNDMA in the fluid loss additive reduces water loss and free fluid content, increases the consistency, and leads the poor rheology and strength of cement. In addition, the two additives have good thermal stability and heat resistance &salt resistance.
    西部氯鹽漬土地區混凝土中氯離子結合能力研究
    西部氯鹽漬土地區混凝土中氯離子結合能力研究
    • 張 菊1,2,白樸存1,閆長旺2,劉曙光1,2
    2016年第4期
    摘要
    引用本文
    摘 要:為研究西部氯鹽漬土地區混凝土中氯離子結合能力,采用高濃度氯化鈉溶液,進行了混凝土長期浸泡試驗,對混凝土中結合氯離子含量分布規律、結合氯離子含量與自由氯離子含量的關系、氯離子結合能力隨擴散深度和浸泡時間的變化規律,以及環境對氯離子結合能力的影響進行了研究。結果表明,結合氯離子含量沿擴散深度呈現出先增長后降低的規律,存在含量峰值,在同一擴散深度處,約為自由氯離子含量的56%。氯離子結合能力試驗值沿擴散深度和浸泡時間呈波動變化規律,其值明顯高于其他氯離子環境,受環境影響明顯。 Abstract: In order to study the chloride binding capacity of concrete in west chlorine saline soil region, high concentration sodium chloride solution was used and long term immersion test of concrete was performed. Some contents were analyzed, such as distribution of binding chlorine, relation of binding chlorine and free chlorine, changes of chloride binding capacity along diffusion depth and immersion time, and the influence of environment on chloride binding capacity. The results show that binding chlorine content increases firstly and then decreases along diffusion depth, and that content peak exists. Ratio of binding chlorine and free chlorine is 56% in the same diffusion depth. Test values of chloride binding capacity fluctuate with diffusion depth and immersion time, they are different from ones in the other environment and affected obviously by the environment.
    強化再生骨料性能試驗研究
    強化再生骨料性能試驗研究
    • 王海超1,2, 陳 晨1,趙倩倩2,胡翠平2
    2016年第4期
    摘要
    引用本文
    摘 要:再生骨料具有大量細部裂縫,骨料表面的吸水率較高,因而收縮變形較大,導致其力學性能降低。本文就改善再生骨料的表面強度進行試驗研究。通過使用滲透結晶材料對廢棄混凝土骨料表面進行處理,將處理后的再生骨料、天然骨料以及未做處理的再生骨料,按照同種配合比制作成標準試件,然后進行力學性能測試,將測試結果進行比較。結果表明,使用滲透結晶材料處理過的骨料,其性能與未經處理的再生骨料相比有較大變化,其力學性能得到很大改善;經過處理后的再生骨料與天然骨料之間的性能差異變得非常微小。 Abstract: The recycled aggregate is often due to a large number of detailed cracks, the water absorption rate of the aggregate surface is high, so that the shrinkage deformation is larger, which leads to the decrease of the mechanical properties. The surface strength of recycled aggregate is studied in this paper. By using permeable crystalline materials, the treated recycled aggregate, natural aggregate and recycled aggregate without treatment are used to prepare the specimens according to the same mix proportion. Then the mechanical performance test is performed and the test results are compared. The results show that the properties of the treated aggregate have great changes compared with the recycled aggregate, the mechanical properties of treated aggregate are greatly improved by the use of permeable crystalline materials, and their properties are slightly different between treated recycled aggregate and natural aggregate.
    混凝土對大氣PM2.5吸收性的影響研究進展
    混凝土對大氣PM2.5吸收性的影響研究進展
    • 濮 琦1,2,姚 燕2,王 玲2,劉遠祥1,史星祥1
    2016年第4期
    摘要
    引用本文
    摘 要:概述大氣PM2.5、混凝土的相關特性,提出利用混凝土吸濕性吸收大氣PM2.5、解決PM2.5大氣污染的新思路。分析影響混凝土吸收大氣PM2.5的內在因素和外在因素。最后在已有研究成果的基礎上,指出有待進一步研究的思路。 Abstract: Summary of current worldwide researches on absorbability of concrete for PM2.5 was presented. A new method was proposed by the absorbability of concrete to solve the pollution of PM2.5. The factors to influence the absorbability of concrete were analyzed. Some key problems to be further studied were proposed on the basis of the research achievements.
    回彈法推定砌體中普通混凝土實心磚抗壓強度的研究
    回彈法推定砌體中普通混凝土實心磚抗壓強度的研究
    • 陳大川,裴小放,毛延賓
    2016年第4期
    摘要
    引用本文
    摘 要:基于6個普通混凝土實心磚標準試件的對比試驗,研究了普通混凝土實心磚在不同等級的約束條件、豎向壓力和砌筑砂漿下對回彈值的影響。將24個標準試件試驗得到的抗壓強度值和回彈值回歸擬合,得出了回彈法推定普通混凝土實心磚抗壓強度統一公式,并進行了驗證試驗。結果表明,該公式具有較高精度,可為行業標準《非燒結磚砌體現場檢測技術規程》制定提供參考。 Abstract:Through 6 comparison tests of soild concrete block masonry specimens by rebound method, the relationship of rebound value of the blocks under different conditions of constraints, vertical load and masonry mortar is analyzed. Based on the comparison and analysis of the experimental data of 24 Soild concrete block masonry specimens, a general calculation formula of compressive strength for soild concrete brick in existing masonry is put forward. By testing compressive strength of the test walls in Sichuan academy of building research, Jiangsu academy of ruilding research and Nanchong quality supervision department, the confirmatory experimental results show the high accuracy of this formula, which can provide some essential bases for revision of industry standard “The method of evaluating the non agglomeration brick strength grading by rebound method”.
    PHC管樁安全起吊最大長度的計算方法探討
    PHC管樁安全起吊最大長度的計算方法探討
    • 何友林
    2016年第4期
    摘要
    引用本文
    摘 要:通過對管樁產品兩端起吊和兩點起吊時的受力狀態進行分析,分別推導出了管樁產品兩端起吊和兩點起吊時的最大彎矩和長度的關系式。并以管樁開裂彎矩檢驗值作為安全起吊的最大彎矩控制條件,動力系數取1.5倍,分別計算出了管樁產品兩端起吊和兩點起吊時安全起吊的最大長度,為管樁安全生產保證管樁產品質量提供了理論依據。 Abstract:By force analysis for hoisting PHC pile at the two ends and at the two fixed points, the relational expressions of the maximum bending moment and the length of pile are put forward separately when the pile is hoisted at the two ends and at the two fixed points. The maximum lengths of pile safe hoisting are calculated separately for hoisting PHC pile at the two ends and at the two fixed points according that the maximum bending moment of safe hoisting pile should be less or equal to the crack bending moment inspection value. Here, the dynamic coefficient is 1.5. The theoretical basis is provided for hoisting piles safely and guaranteeing quality of piles.
    懸輥法制管易發生的質量通病及解決方法
    懸輥法制管易發生的質量通病及解決方法
    • 朱 麗1,王慶勇1,徐邊疆1,孫以伶2,于珊珊2,王先進2
    2016年第4期
    摘要
    引用本文
    摘 要:探討了采用懸輥工藝制造鋼筋混凝土排水管時易產生管內壁塌落、縱向和環向裂縫、合縫漏漿、鋼筋移位、麻坑等通病的原因,并針對這些質量通病,提出了新的解決方法。 Abstract: Reinforced concrete drainpipe easily occurs some common quality problems using roller suspension process such as tube wall caving, longitudinal and annular crack, joint leak slurry, steel bar displacement, pitted surface. Here, causes of these problems and some solutions are put forward.
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