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    蘇州混凝土水泥制品研究院有限公司

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    發布時間:2020-01-06 00:00:00
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    第七期

    高吸水樹脂基內養護水分在水泥漿體中的釋放及水化規律
    高吸水樹脂基內養護水分在水泥漿體中的釋放及水化規律
    • 李享濤1,2
    2017年第7期
    摘要
    引用本文
    摘 要:以高吸水樹脂(SAP)為內養護水分蓄存載體,采用核磁共振法研究了內養護水分在水泥漿體中的釋放規律,探索了其對水泥漿體毛細負壓的影響以及參與水化的特征。結果表明,高吸水樹脂基內養護水泥漿體的0.1~6ms弛豫峰和32.7~200.9ms、231.0~1629.7ms弛豫峰分別由毛細水、內養護水產生;內養護水分的釋放始于水泥漿體水化加速期,內養護時間隨蓄水SAP摻量的增加而延長;釋放出的內養護水分降低了水泥漿體的毛細負壓,同時也促進了水泥漿體的水化;SAP僅控制的是內養護水分的釋放速率,內養護水泥漿體與直接增加相同額外水量的漿體后期水化程度相當。 Abstract: Based on super absorbent polymer served as carrier of internal curing water, release of internal curing water in cement paste was studied with NMR method, and its effect on capillary pressure of cement paste as well as characteristics of participation in hydration were analyzed. It was indicated from the results that 0.1 ~ 6ms relaxation peak was induced by capillary water, 32.7~200.9ms and 231.0~1629.7ms relaxation peak were induced by internal curing water in internal curing paste; the release of internal curing water started in the beginning of hydration acceleration period, and internal curing duration increased with the increase of dosage of SAP. The internal curing water released would not only reduce the capillary pressure, but also promote the hydration of cement paste. As SAP only controlled release rate of internal curing water, late hydration degree of internal curing paste was the same as that of the paste with adding equal additional water directly.
    李享濤.高吸水樹脂基內養護水分在水泥漿體中的釋放及水化規律[J].混凝土與水泥制品,2017(7):1-5. LI X T.Release and Hydration Rules of Internal Curing Water for Super Absorbent Polymer in Cement Paste[J].China Concrete and Cement Products,2017(7):1-5.
    干濕循環作用下再生混凝土中硫酸鹽傳輸性能研究
    干濕循環作用下再生混凝土中硫酸鹽傳輸性能研究
    • 祁 兵1,2 ,高建明1,2 ,沈達滿1,2
    2017年第7期
    摘要
    引用本文
    摘??要:研究了在干濕循環作用下,硫酸根離子在再生混凝土中的傳輸規律。采用分光光度計法定量表征不同深度處的水溶硫酸根離子濃度,研究再生粗骨料取代率(0,30%,50%,70%,100%)、礦物摻合料、水膠比、腐蝕齡期及干濕循環制度對其傳輸規律的影響。結果表明,再生粗骨料的摻入對硫酸鹽傳輸有較為明顯的影響。試驗還表明,硫酸鹽-干濕循環耦合作用下,粉煤灰和礦粉等礦物摻合料可阻礙硫酸根離子在再生混凝土中的傳輸,再生混凝土水膠比越小其水溶硫酸根離子濃度越小。隨著腐蝕齡期增長,再生混凝土水溶硫酸根離子濃度大幅增加。與單一鹽溶液侵蝕相比,干濕循環加劇了硫酸根離子在再生混凝土中的傳輸,其水溶硫酸根離子濃度隨著循環次數的增加而增大。Abstract:Thetransmissionmechanismofsulfateioninrecycledaggregateconcretemadewithdifferentrecycledcoarseaggregate(RCA)undersulfateattackandwetting-dryingcyclesisinvestigatedinthispaper.Thewater-solublesulfateioncontentsaremeasuredbymeansofultra-violetandvisiblespectrophotometer.TheinfluencesofRCAreplacement,mineraladditions,w/bratio,erosiontimeandwetting-dryingregimeonthetransmissionmechanismofsulfateioninrecycledaggregateconcretearestudied.TheresultsindicatethattheincorporationofRCAshowsanobviousimpactontheresistanceofconcreteagainstsulfateattackunderwetting-dryingcycles.Additional,themineraladditionsmodifiedrecycledaggregateconcretehinderthetransmissionofsulfateionthanplainrecycledaggregateconcrete.Thewater-solublesulfateioncontentsdecreasewiththedecreaseofW/Bratio.Moreover,thewater-solublesulfateioncontentsincreasewiththetimeoferosionunderwetting-dryingcycles.Thewetting-dryingcycleshaveamajorimpactonthetransmissionmechanismofsulfateioninrecycledaggregateconcrete.Thewater-solublesulfateioncontentsincreasewiththenumberofwetting-dryingcycle.
    祁兵,高建明,沈達滿.干濕循環作用下再生混凝土中硫酸鹽傳輸性能研究[J].混凝土與水泥制品,2017(7):6-10. QI B, GAO J M, SHEN D M.Research on Transmission Properties of Sulfate in Recycled Aggregate Concrete Under Wetting-drying Cycles[J].China Concrete and Cement Products,2017(7):6-10.
    毛細作用下硫酸鹽溶液在水泥基材料中的傳輸研究
    毛細作用下硫酸鹽溶液在水泥基材料中的傳輸研究
    • 李洪馬,潘志華,姜海東,王 毅
    2017年第7期
    摘要
    引用本文
    摘 要:硫酸鹽溶液在混凝土中的傳輸速率是造成硫酸鹽對混凝土侵蝕破壞的主要控制因素,硫酸鹽溶液在混凝土中傳輸速率越大,單位時間內進入混凝土中的硫酸鹽溶液越多,溶液中水分蒸發速率越快,則對混凝土造成的侵蝕就越顯著。通過試驗研究了毛細作用下硫酸鹽溶液在水泥基材料中傳輸的影響因素。試驗結果表明,低水灰比條件下水泥砂漿的硫酸鹽溶液的傳輸能力顯著降低;摻入適量的超細礦渣粉和粉煤灰可以改善水泥砂漿的抗滲性能;在相同濃度下,水泥基材料對硫酸鈉的吸附能力最強,硫酸銨次之,硫酸鎂最弱。 Abstract: The transfer rate of sulfate solution in concrete is the main controlling factor of sulfate damage to concrete, when the transfer rate of sulfate solution in concrete is larger, sulfate solution entering concrete in unit time, water evaporation rate in solution, the erosion of concrete is more significant. The influence factors of sulfate solution on cement-based materials were studied by capillary experiments. Test results show that the transfer capacity of sulfate solution of cement mortar under low water cement ratio was significantly lower, adding appropriate amount of superfine slag powder and fly ash can improve the impermeability of cement mortar, at the same concentration, the adsorption ability of cement-based materials to sodium sulfate is the strongest, ammonium sulfate is the second, and magnesium sulfate is the weakest.
    李洪馬,潘志華,姜海東,等.毛細作用下硫酸鹽溶液在水泥基材料中的傳輸研究[J].混凝土與水泥制品,2017(7):11-16. LI H M, PAN Z H, JIANG H D,et al.Transmission Study on Sulfate Solution in Cement-based Materials Under Capillary Roles[J].China Concrete and Cement Products,2017(7):11-16.
    半剛性基層早強劑影響與早中期強度研究
    半剛性基層早強劑影響與早中期強度研究
    • 林 敏,馬江濤,劉 超,宋云連
    2017年第7期
    摘要
    引用本文
    摘 要:水泥穩定碎石是一種常用的半剛性基層。為了使其快速形成強度,減少對道路運營和社會出行的影響,本文采用無水硫酸鈉和三乙醇胺作為外加劑進行單摻和復摻,然后進行無側限抗壓強度試驗,對比選出三種24h強度提高效果在60%以上的配方,進行早中期無側限抗壓試驗。試驗結果表明,加入早強劑的試件組強度明顯高于未加入早強劑的試件組,其中24h強度增長率最為明顯,最高增長率可達73.8%;同時,早中期強度均有不同程度提高。 Abstract: Cement stabilized gravel is a semi-rigid base material. In order to make it quickly form strength, reduce the impact on road operation and social travel, in this paper, anhydrous sodium sulfate and triethanolamine as raw materials for admixture of single blending and blending compound are used, and then the unconfined compressive strength test is carried out, and three 24-hour intensity increasing more than 60% formula are compared to select, to do the early and mid-term unconfined compression test. The test results show that the strength of the test pieces added with early strength agent is significantly higher than that of the group without adding early strength agent, of which 24 hour intensity growth rate is the most obvious, and the highest growth rate is 73.8%, and the early and middle intensity also have different improvement in degree.
    林敏,馬江濤,劉超,等.半剛性基層早強劑影響與早中期強度研究[J].混凝土與水泥制品,2017(7):17-21. LIN M, MA J T, LIU C,et al.Research on Influence of Early Strength Agent for Semi-rigid Base and Early and Mid-term Strength[J].China Concrete and Cement Products,2017(7):17-21.
    鋰渣對混凝土抗氯離子侵蝕性能的影響研究
    鋰渣對混凝土抗氯離子侵蝕性能的影響研究
    • 韓國旗,溫 勇,王 晨,馬麗莎,王 渤
    2017年第7期
    摘要
    引用本文
    摘 要:通過試驗研究不同水灰比和鋰渣替代率的混凝土試件在不同侵蝕齡期、氯鹽溶液濃度的作用下,探討鋰渣對混凝土抗氯離子侵蝕性能的影響。試驗采用自然浸泡法研究氯離子在飽和混凝土中擴散傳輸性能,通過鉆芯取樣,分層研磨,依照水溶性氯離子含量的測定方法獲取各試件不同深度的氯離子濃度。結果表明,氯離子在混凝土中的擴散能很好地吻合Fick第二定律;鋰渣作為礦物摻合料替代水泥后能有效降低氯離子在混凝土中的擴散,當鋰渣摻量為20%和30%時,混凝土氯離子擴散系數僅相當于空白試件的40%和37%。水灰比的降低能夠顯著降低混凝土氯離子擴散系數;隨著侵蝕齡期的增大,氯離子擴散系數減小,且各齡期下摻入鋰渣的混凝土氯離子擴散系數均比空白試件小。 Abstract: The experiment compared the age of corrosion, the amount of lithium slag, chlorine salt solution concentration of concrete working environment and the change of water cement ratio, the performance of the resistance to chloride ingress of concrete doped with lithium slag was investigated. The chloride ion diffusion transport in saturated concrete performance is used to study by the natural immersion method. The concrete in different depth of chloride ion concentration was estimated by the drilling concrete cores and the water soluble method. The results show that diffusion of chloride ions in concrete conforms to the Fick's second law, lithium slag as mineral admixtures can effectively reduce the chloride diffusion in concrete, when the doped lithium slag is 20% and 30%, chloride ion diffusion coefficient of concrete is equal to the blank specimen of 40% and 37%, chloride diffusion coefficient decrease with the decrease of water to binder ratio. With the increasing of corrosion age, the chloride diffusion coefficient decreased, and at every corrosion age, the chloride diffusion coefficient of concrete mixed with lithium slag is lower than that of the blank specimen.
    韓國旗,溫勇,王晨,等.鋰渣對混凝土抗氯離子侵蝕性能的影響研究[J].混凝土與水泥制品,2017(7):22-26. HAN G Q, WEN Y, WANG C,et al.Effects Study of Lithium Slag on Resistance Performance to Chloride Ion of Concrete[J].China Concrete and Cement Products,2017(7):22-26.
    防水型可再分散乳膠粉的制備及其性能研究
    防水型可再分散乳膠粉的制備及其性能研究
    • 史 林
    2017年第7期
    摘要
    引用本文
    摘 要:從乳液體系的穩定性出發,通過HLB值尋求合適的乳化劑比例,制備了一種新型防水型可再分散乳膠粉,并研究了其對砂漿接觸角、混凝土吸水量和混凝土強度的影響。采用乳化劑HLB為10時,其乳液穩定,可以長期存放。加入防水型可再分散乳膠粉后,砂漿表面接觸角明顯增加,混凝土吸水量隨之降低,證實了防水型可再分散乳膠粉優異的防水性能;在摻量小于0.3%時,防水型可再分散乳膠粉對混凝土強度無負面影響。 Abstract: From the stability of emulsion system, a new type of water-proof redispersible emulsion powder was prepared by seeking a proper proportion of the emulsifier by HLB. The effect of water-proof redispersible emulsion powder on the contact angle of mortar, the water absorption and strength of concrete was studied. With the HLB of emulsifier was 10, the emulsion was stable and could be stored for a long time. The surface contact angle of mortar increased, the water absorption of concrete decreased, which confirmed the excellent water-proof performance of water-proof type redispersible emulsion powder. The water-proof type redispersible emulsion powder had no negative impact on the strength of concrete when the content was less than 0.3%.
    史林.防水型可再分散乳膠粉的制備及其性能研究[J].混凝土與水泥制品,2017(7):27-29. SHI L.Preparation and Its Properties Research on Water-proof Redispersible Emulsion Powder[J].China Concrete and Cement Products,2017(7):27-29.
    預制混凝土箱涵在地下綜合管廊中應用的一些技術問題探討
    預制混凝土箱涵在地下綜合管廊中應用的一些技術問題探討
    • 曹生龍
    2017年第7期
    摘要
    引用本文
    摘 要:對預制混凝土箱涵及其他管道的應用情況進行了總結,并對預制混凝土箱涵在制作及施工中出現的問題作了介紹,可為預制混凝土箱涵在地下綜合管廊及其他管道基礎建設中的應用提供參考。 Abstract: The application of precast concrete box culvert and other pipelines are summarized, and the problems of production and construction of precast concrete box culvert are introduced, which can provide reference for the precast concrete box culvert in the application and development of underground pipe gallery infrastructure.
    曹生龍.預制混凝土箱涵在地下綜合管廊中應用的一些技術問題探討[J].混凝土與水泥制品,2017(7):30-37. CAO S L.Discussion on Technology Problems for Precast Concrete Box Culvert in Underground Intergrated Gallery Application[J].China Concrete and Cement Products,2017(7):30-37.
    再生混凝土板承載能力試驗研究
    再生混凝土板承載能力試驗研究
    • 吳慶發1,古 松2,羅陽明1
    2017年第7期
    摘要
    引用本文
    摘 要:通過對再生骨料取代率為70%的鋼筋混凝土板和普通鋼筋混凝土板的試驗比較,研究了再生混凝土板在受荷載作用下的破壞形態。試驗結果表明,再生混凝土板與普通混凝土板的破壞過程相似,且在相同配筋率情況下,再生混凝土板的承載能力和變形與普通鋼筋混凝土板大致相當。因此,根據GB 50010—2010《混凝土結構設計規范》提出的普通混凝土計算公式也適用于再生混凝土,并且具有較高的安全儲備。 Abstract: Compared reinforcement of 70% recycled aggregate concrete with the ordinary concrete plate, the damage form of recycled concrete plate is studied under the load, the results show that the failure process of recycled concrete plate is similar to ordinary concrete plate, under the condition of the same reinforcement ratio, the bearing capacity and deformation of recycled concrete are similar with ordinary concrete plate. According to the GB 50010—2010 Concrete Structure Design, the concrete formula can also be applied to recycled concrete, and has high security reserves.
    吳慶發,古松,羅陽明.再生混凝土板承載能力試驗研究[J].混凝土與水泥制品,2017(7):38-42. WU Q F, GU S ,LUO Y M.Experimental Study on Bearing Capacity of Recycled Concrete Slab[J].China Concrete and Cement Products,2017(7):38-42.
    長沙地鐵管片混凝土耐久性試驗研究
    長沙地鐵管片混凝土耐久性試驗研究
    • 袁吉童,向佳瑜,李 曦,蔣 震,冷 政
    2017年第7期
    摘要
    引用本文
    摘??要:針對中南地區地下水對地鐵混凝土耐久性的不利影響,從湖南地區常用水泥水化放熱情況、養護制度及納米SiO2使用情況等方面出發,系統性地研究了關鍵因素對長沙地鐵4、5號線C50P12管片混凝土耐久性能的影響。結果表明,該區域不同水泥水化熱情況差異較大。隨著水化熱的增加,混凝土收縮、電通量、碳化深度隨之增加,抗硫酸鹽侵蝕性能降低;隨著養護溫度的升高,混凝土電通量、碳化深度也隨之增加,抗硫酸鹽侵蝕性能降低;增加靜停時間和使用納米SiO2將有利于地鐵管片混凝土后期強度和耐久性。Abstract:AccordingtotheabundantundergroundwaterinsouthofChina,whichmakesagreatbadeffectonthedurabilityofconcretesegment,theeffectsofcementhydrationheatrelease,curingmethodandusingofnanometerSiO2onC50P12segmentconcreteofChangshaMetroLine4,5aresystematicallystudied.Theresultsshowthatthedifferentcementhasdifferenthydrationheatrelease,asthehydrationheatreleaseincreases,theconstriction,electricfluxandcarbonationdepthoftheconcreteincrease,thesulfateattackresistancedecreases.Theriseofcuringtemperaturecausestheincreasingoftheconcreteelectricfluxandcarbonationdepth.TheincreasingofstaticstoptimeandtheuseofnanometerSiO2arebeneficialtothestrengthanddurabilitypropertiesoftheconcretesegment.
    袁吉童,向佳瑜,李曦,等.長沙地鐵管片混凝土耐久性試驗研究[J].混凝土與水泥制品,2017(7):43-46. YUAN J T, XIANG J Y, LI X,et al.Experimental Research on Durability of Metro Concrete Segment in Changsha[J].China Concrete and Cement Products,2017(7):43-46.
    稻草纖維水泥基復合材料力學性能試驗研究
    稻草纖維水泥基復合材料力學性能試驗研究
    • 廖昭印,雷勁松,陳夢婷,周孝紅
    2017年第7期
    摘要
    引用本文
    摘 要:將稻草纖維摻入量定為0、2.5%、5%、7.5%、10%,并將稻草纖維分成絲狀和粉末狀,研究了不同形狀、不同摻量的稻草纖維水泥基復合材料的力學性能。結果表明,隨著絲狀和粉末狀纖維的加入,試件的抗壓強度和抗折強度總體呈降低趨勢,但抗沖擊性能得到了明顯的提升;隨著稻草纖維摻量的增加,絲狀水泥基復合材料的抗沖擊性能增強會穩定在一個范圍內,而粉末狀水泥基復合材料的抗沖擊性能會逐步增高并在摻量為10%時達到最佳。 Abstract: The fiber of rice straw incorporation is set as 0,2.5%,5%,7.5%,10%, the mechanical properties of different shapes and different amounts of rice straw fiber cement-based composite are studied. The results show that with adding filamentous fibers and powder fibers, the compressive strength and flexural strength of the cement base reduce gradually, but the impact performance has been significantly improved; and with the increase of dosage of straw fiber, the resistance of filamentous cement-based composite will be stable in a range, but the resistance of powder-like cement-based composite will gradually increase, and when the content of 10% achieves the best.
    廖昭印,雷勁松,陳夢婷,等.稻草纖維水泥基復合材料力學性能試驗研究[J].混凝土與水泥制品,2017(7):47-50. LIAO Z Y, LEI J S, CHEN M T,et al.Experimental Study on Mechanical Performance of Straw Fiber Cement Based Composite Materials[J].China Concrete and Cement Products,2017(7):47-50.
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