old concrete 中文意思是什麼
old concrete
解釋
舊混凝土-
The research overcomes the shortcomings of primers in common use, and breaks through the traditional astriction of absence of chemical bond between new and old concrete. both macrostructure and microstructure as well as bond mechanism was discussed and some further research advice was put forward
本研究克服了以往的界面劑僅能改善界面層宏觀或微細觀結構的缺點，突破了新老混凝土粘結層主要依靠范德華力提供界面粘結力而幾乎不存在化學鍵作用的缺點。 -
Specially, the axial tensile strength of the interface of the new and old concrete has reached above 2. 40mpa, greatly surpassing the preconcert goal ( > 1. 0mpa ), and its flexural strength also above 5. 80mpa, having surpassed the preconcert target and the standard request ( 4. 50mpa ). ( 2 ) after hardening 4h and 8h the compressive strength of the patched concrete is bigger than 20 mpa, which can satisfy the request of fast patching. ( 3 ) the ych color material, which is mixed into rapid sulfoaluminate cement - concrete patching material, can take better effect and avoid chromatism on the appearance of new - old concrete
特別是新老混凝土界面的軸向抗拉強度已達2 . 40mpa以上，大大超過原定目標（大於1 . 0mpa ） ，其界面抗折強度也在5 . 80mpa以上，也已超過原定指標及規范要求（大於或等於4 . 50mpa ） ; （ 2 ）修補混凝土硬化后4h 、 8h抗壓強度大於20mpa ，能滿足快速修補的要求; （ 3 ）在快硬硫鋁酸鹽水泥混凝土修補材料中摻入自配的ych調色材料，能較好地起到調色作用，避免新老混凝土表面色差。 -
Following is the factors ideating with the surface of old concrete in different way ( including brushing surface, chiseling surface, cleaving surface ), adherence agent ( including cement slurry, cement sand slurry, cement slurry with the u expansion agent ), the freeze - thaw circulation times and air - entraining. as a result, we found that the roughness influence on the adhesion capability of the new on old concrete to a large degree. the larger rougeness is, the larger the splitting tensile strength on the adhension face is. the kind of adhesion agent is also influence on the adherence capability of new on old concrete. the circulation times of freez - thaw have a large influence on the splitting tensile strength of adherence face of new on old concrete. the analysis of tests give some advices to the practical engineering
主要考察了老混凝土表面不同處理方式（刷毛面，鑿毛面，劈裂面） 、界面粘結劑類型（水泥凈漿，水泥砂漿， u型膨脹劑水泥漿） 、凍融循環次數等對新老混凝土粘結面劈拉強度的影響，以及凍融作用下新混凝土加氣對粘結面劈拉強度的影響。試驗結果表明，粗糙度對新老混凝土粘結性能有重要影響，隨著粘結面粗糙度的增大，粘結面劈拉強度不斷增加；界面粘結劑類型對新老混凝土粘結性能有一定影響，在凍融作用下， u型膨脹劑水泥漿粘結效果不如水泥凈漿和水泥砂漿；凍融循環對粘結面劈拉強度有較大影響，加氣能明顯改善新老混凝土粘結面的抗凍能力。 -
In the same time, according to the fracture test results, the influence mechanism of aggregate size on fracture toughness of adherence of new and old concrete is discussed and analyzed, which is verified by manse of the fractal theory
同時根據新老混凝土粘結斷裂試驗結果，分析了粗骨料最大粒徑對新老混凝土粘結斷裂韌度的影響機理，並用分形理論對影響機理進行了驗證。 -
This paper establishes a model simulating dam actual placing process and considering the non - continuity of initial temperature on the boundary of new and old concrete, daily air temperature change, concrete - placing temperature, hydration heat, heat insulation on boundary, water - storing process, placing intermission and curing with water. the calculation of stress field considers the concrete weight, static water pressure, thermal stress, different autogenous volume change between rcc and normal concrete, change of elastic modulus of concrete with age and creep action
考慮了乞今最為全面的初始條件和邊界條件，包括模擬壩體的實際升程過程，考慮了新老混凝土接觸面上的初始溫度不連續，逐日的氣溫變化，混凝土的入倉溫度，水化熱溫升，邊界保溫，水庫蓄水過程，澆築間歇以及灑水養生等因素；應力場的計算考慮了混凝土的自重，靜水壓力，溫度應力，常態混凝土與碾壓混凝土不同的自生體積變形，混凝土的彈性模量隨齡期的變化以及徐變的作用。 -
Key way cutting construction on binding face of new and old concrete for dam heightening of danjiangkou project
丹江口大壩加高工程新老結合面鍵槽切割施工 -
Effect of interfacial agent on bond strength between new and old concrete
界面劑對新老砼粘結強度的影響 -
The co - effect of silane coupling agent, shrinkage reducing admixtureand fly ash on new - to - old concrete interfacial layer were primarily studied through a contradistinctive experimental study in this paper
摘要通過對比試驗研究，初步探討偶聯劑、減縮劑和粉煤灰共同作用對新老混凝土界面層劈拉強度的影響。 -
Scientific research and design institute of cscec in guizhou cooperate with prof. peng xiaoqin, and research the bond technology of the new and old concrete. which are researched to four points as follows : 1. several major methods evaluating the degree of roughness were analyzed, and their advantages and disadvantages were analyzed
貴州中建建築科研設計院與重慶大學材料學院彭小芹教授合作，主要對新舊混凝土粘結技術進行了研究，主要集中在以下幾個方面: 1 .分析目前常用的幾種評價粗糙度的方法，並對每種方法的優缺點進行評述;提出一種簡便易行的測量粗糙度的方法，克服目前常用方法的缺點，並通過多組數據和灌砂法進行相關性分析，得出兩者之間的關系。 -
The main content is : splitting tensile experiments were carried out about the standardized cube bonding specimens ( 150x 150x 150mm3 ) of the new - old concrete after high temperature. the temperature is divided into 9 groups from normal atmospheric temperature to 900, the cooling styles are natural cooling and spraying water cooling ; different interfacial treating methods : brushed with steel - wire brush, man - made chiseling ( not evenly ), man - made chiseling ( quite evenly ) ; different interfacial agents : no interfacial agent, neat cement paste, cement paste mixed with 10 % expanding agent
主要內容有：本文對75個高溫作用后的標準立方體新老混凝土粘結試件進行了劈拉試驗，溫度從常溫到900c分9個溫度段，降溫方式分自然冷卻和噴水冷卻兩種。著重考察了溫度、降溫方式、界面粗糙度及界面劑對新老混凝土粘結劈拉強度的影響規律，闡述了高溫后粘結強度下降的機理。 -
It indicates that the interfacial bonding of new to old concrete has good shearing property
結果表明，溝槽式新老混凝土粘結面具有較好的抗剪性能。 -
The results show that, the interfacial bonding strength of new and old concrete is evidence lower than the new or old concrete itself. besides the dimension and roughness of bond interface, the chemical reaction degree at the interface is also the main factor
分析結果表明：新老混凝土的界面粘結強度除了受老混凝土界面的尺寸及表面結構、粗糙程度影響外，還與新老混凝土粘結界面間發生化學反應的強弱有關。 -
In fact, the adherence of young and old concrete belongs to the adherence research work of bimaterial. the simulation calculation shows that in the range of criterion provision of young and old concrete that the formula for calculating the splitting tensile strength of a monolithic concrete specimen can be used to a concrete specimen of young and old concrete when the difference of elastic modulus of young and old concrete is small
新老混凝土的粘結實際是彈性模量不同的兩種材料? ?即雙材料的結合問題。本文通過數值模擬計算結果表明，在規范規定的修補結構新老混凝土強度等級差值范圍內，新老混凝土彈性模量相差不大的情況下，新老混凝土粘結劈拉強度可近似採用整體混凝土劈拉強度計算公式。 -
This paper is a part of the country s grave foundational research subject ( climbing project b ) and country s natural science fund item ( 59778045 ) < < study on mechanism of adherence of new and old concrete > >
本文屬國家基礎性研究重大項目（攀登計劃b ） 《重大土木與水利工程安全性與耐久性的基礎研究》之5 . 2 （ 1 ）課題及國家自然科學基金項目（ 59778045 ） 《新老混凝土的粘結機理研究》課題子項。 -
The test results show that, the fracture properties of adherence of new and old concrete are evidence lower than the new concrete itself
試驗結果表明，新老混凝土粘結斷裂性能明顯低於新混凝土整體試件的斷裂性能。 -
The design strength of the new concrete is c40, which adopts 525 # common portland cement, the sand is middle wide river - sand, the radius of coarse aggregate is 10 - 30mm. the surfaces of the old concrete which are harnessed are divided into i, ii, iii three type faces
Znfl ， ao新混凝土設計強度等級選用c40 ，採用525 』普通硅酸鹽水泥，砂是中粗河砂，粗骨料的粒徑為川30mm 。老混凝土表面處理后的表面分為1型面、 11型面、 ill型面三種類型。 -
6 with the optimization of the mix proportion of hprrc and with the old concrete was repaired with hprrc whose strength is close with that of the old concrete, the stress - strain curves of new - old concrete is tested on ordinary testing machine and mts. the results show that under equal stress conditions, the ratios of the strain of old concrete, hprrc to new - old concrete are 82. 4 - 105 % on ordinary testing machine and 90 - 121. 3 % on mts respectively
6 、通過優化hprrc的配比，用與老混凝土強度接近的新混凝土對老混凝土進行修補后，在普通試驗機和mts試驗機上對新老混凝土的本構關系進行了試驗研究，結果表明：在等應力條件下老砼、 hprrc博士學位論文.中文摘要的應變與新一老鹼的相比，應變的比率在普通試驗機上為82 . 4一105 % ，在川、 s上為90一121 . 3 % ，即三者變形是基本接近的。 -
2. several processing methods to concrete surfaces were analyzed, and their advantages and disadvantages were analyze through experiment, the relationship of the water - jet stress and the degree of roughness and the bond strength of the old concrete surface was researched when treating the surface of the old concrete with spraying high - press water
2 .分析目前常用的幾種舊混凝土表面的處理方式，並對每種方法的優缺點進行評述，通過實驗研究高壓水射法處理舊混凝土表面，射水壓力和舊混凝土表面粗糙度及界面粘結強度的關系。 -
Research on new - old concrete combination for danjiangkou gravity dam heightened during post - period
對丹江口大壩加高工程施工與樞紐運行管理關系的探討 -
This paper analyzes how structure characteristic of old concrete pavement affects the load stress of asphalt overlay by the three dimensions finite element analysis program - adina. ( 2 ) the asphalt overlay design in rehabilitation of old cement concrete pavement asphalt overlay design not only relates the distress, structure characteristic, traffic and environment of the old pavement, but also requires reasonable mechanics model, correct material parameter, effective measure of preventing reflection cracking, and so on
（ 2 ）舊水泥混凝土路面瀝青罩面改造中瀝青罩面層的設計舊路改造的罩面設計方法不僅涉及舊路面的損壞、結構狀況、交通狀況、環境因素，而且還需要合適的力學分析模型、正確的材料參數、有效的防反射裂縫措施等，內容廣泛、復雜多變，至今尚未有成熟的設計方法。
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