第五期_2013_《混凝土與水泥制品》雜志社

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第五期

尿素對磷酸鎂水泥凝結時間和水化放熱的影響

吉飛1，焦寶祥2，丘泰1

２０13年第5期

摘要

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摘??要：研究了尿素對磷酸鎂水泥（MPC）凝結時間和水化放熱過程的影響。結果表明，在磷酸二氫鉀與氧化鎂質量比為1：3、水膠比為0.16時，單獨添加尿素作為緩凝劑，對MPC凝結時間和水化放熱影響不顯著。當尿素和硼砂同時添加時，體系的凝結時間和水化放熱曲線有顯著的不同。在硼砂量為磷酸二氫鉀與氧化鎂質量總和的1%時，隨尿素添加量的增加，MPC的凝結時間顯著延長，其第一和第二水化放熱峰峰高顯著降低；但當硼砂添加量達2.5%時（在尿素摻量相同的情況下），體系的凝結時間又有所縮短，水化放熱峰峰值相應增高。Abstract:Theeffectsofureaonsettingtimeandhydrationexothermicprocessofmagnesiumphosphatecement(MPC)arestudied.TheresultsshowthattheeffectsofureaonsettingtimeandhydrationexothermicprocessarenotobviousifitisusedasthesingleretarderintheMPC,whichisdesignedbythepotassiumdihydrogenphosphateandmagnesiumoxidewithamassproportionof1:3andawatertosolidratioof0.16.Ifureaandboraxareaddedtogether,thesettingtimeandhydrationexothermiccurvesareobviouslydifferent.Whentheadditionofboraxis1%ofthesumweightofpotassiumdihydrogenphosphateandmagnesiumoxideintheMPC,thesettingtimeincreasesandtheintensityforthefirstandthesecondhydrationexothermicpeakssignificantlydecreaseswiththeincreaseoftheureacontent.However,whentheadditionofboraxreaches2.5%andtheadditionofureaisconstant,thesettingtimedecreasesandtheintensityofhydrationexothermicpeaksincreasesaccordingly.

新型膨脹劑在不同強度等級混凝土中膨脹性能的研究

張守治1,2，姚婷1,2，郭飛1,2

２０13年第5期

摘要

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摘要：以實際工程中常用的C30、C40、C50三種強度等級的混凝土為研究對象，系統研究了新型膨脹劑HME在不同強度等級混凝土中的膨脹性能，并探討了膨脹劑HME在不同強度等級混凝土中的膨脹機理。結果表明，未扣除基準混凝土試件膨脹變形時，混凝土強度等級越高，摻膨脹劑HME的混凝土試件膨脹變形越小?？鄢鶞驶炷猎嚰蛎涀冃魏?，膨脹劑HME在低強度等級混凝土中的早期膨脹較大、后期膨脹較??；在高強度等級混凝土中的早期膨脹減少、后期膨脹增多，強度等級越高，HME早期膨脹降低的幅度越大，后期膨脹增大的幅度越高。 Abstract: Using three strength grades concrete including C30, C40 and C50 as the research objects, the expansion performances and expansion mechanism of the new expansive agent HME in the different strength grades concrete are studied and discussed. Experimental results show that when the expansion deformation of reference concrete specimens is not deducted, the higher the level of concrete strength, the smaller expansion deformation of the new expansive agent HME; when the expansion deformation of reference concrete specimens is deducted, HME in lower strength grade concrete will result in a larger expansion and a greater expansion speed in early ages, but a smaller expansion in later ages; HME in higher strength grade concrete will result in a smaller expansion in early ages, but a larger expansion in later ages.

植生型多孔混凝土強度試驗研究

彭波1, 蔣昌波1,2，向泰尚1,2，劉易莊1

２０13年第5期

摘要

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摘要：研究了目標孔隙率、粗集料粒徑、水灰比對植生型多孔混凝土抗壓強度的影響。試驗結果表明，多孔混凝土抗壓強度隨目標孔隙率的減小而增大，隨粗集料粒徑的減小而增大。影響植生型多孔混凝土抗壓強度的三個因素中，目標孔隙率影響最大，粗集料粒徑次之，水灰比的影響最小。 Abstract: The influences of void ratio, coarse aggregate averaging and water-cement ratio on the compressive strength of the plant-growing porous concrete are studied. The results indicate that the compressive strength of the plant-growing porous concrete is increased by the drop of void ratio, and also raised by the drop of coarse aggregate averaging. The void ratio is the most important effect factor on the compressive strength, while the coarse aggregate averaging is the second, and the water-cement ratio is the last.

石灰石粉塵對水泥膠砂性能的影響研究

杭美艷1，高萌1，孫成曉1，蘭英靜2

２０13年第5期

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摘要：將石灰石破碎后產生的粒徑小于0.08mm的粉塵顆粒按不同比例等量替代水泥，研究其對水泥膠砂性能的影響。結果表明，石灰石粉塵的摻量小于12%時，既具有減水作用，又不降低膠砂強度；同時，石灰石粉塵的摻入能有效改善水泥膠砂的收縮性能和抗硫酸鹽侵蝕性能，說明石灰石粉塵具有一定的活性，不是惰性材料。 Abstract: The dust particles with the size less than 0.08mm which was produced by crushing limestone is used to replace the same amount of cement in different proportions, and the performances of cement mortar are studied. The results show that limestone dust has water-reduce effect and does not reduce the strength of the mortar when the dosage of limestone dust is less than 12%. Meanwhile, the addition of limestone powder can improve the shrinkage property and the sulphate corrosion resistance, which can explain that the limestone dust has a certain activity, is not the inert material.

高保坍型聚羧酸減水劑配制高強自密實混凝土在武漢中心工程中的應用

邰煒，鄭廣軍，韓周冰，李興

２０13年第5期

摘要

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摘??要：采用溶液自由基聚合技術合成出一種高保坍型聚羧酸減水劑。通過C60～C80新拌混凝土測試表明，高保坍型聚羧酸減水劑可以有效解決普通聚羧酸減水劑在高溫條件下（35℃）新拌混凝土坍落度、擴展度損失快等問題，對硬化混凝土無不良影響；復配使用高保坍型聚羧酸減水劑的ZJSS-Ⅱ產品，成功拌制出滿足武漢中心項目需求的C60~C80高強自密實混凝土。經性能測試結果表明，該自密實混凝土在夏季高溫條件下（35℃）3h內無坍落度、擴展度損失；通過Ⅰ型U型箱，高度差為0mm，T500流動時間5s；硬化混凝土各項指標達到規范要求，與國外同類產品性能相當。Abstract:Anewkindofpolycarboxylatesuperplasticizerwithslumplossresistancehasbeensynthesizedbythetechnologyoffreeradicalpolymerization.Thenewproductionhasbeengoodeffectofslumplossresistanceinhightemperaturecondition(35℃)withoutanynegativeeffectonhardenedconcrete.TheC60～C80highstrengthself-compactedconcrete,whichisusedintheprojectofWuhancenter,arepreparedbyusingthisnewproduction.Thetestresultsindicatethattheslumpandexpansionlossofthisself-compactedconcreteisnonein3hoursunderthehightemperature(35℃),andtheheightdifferenceofU-boxis0mm,thefluiditytimeofT500is5seconds.Itisshowedthattheperformancesoftheself-compactedconcretepreparedbythisnewproductioncanmeettherequirementsofthestandards,whichissuccessfullyappliedintheprojectofWuhancenter.

混凝土強度恢復能力試驗研究

李軍，常莉

２０13年第5期

摘要

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摘要：通過在水泥砂漿試件中摻入礦物質，測定礦物質對混凝土抗折強度的影響。在礦物質最佳摻量條件下，加入修復液，測其強度恢復率。通過試驗對比，可以得出修復液的添加對混凝土微裂紋的修補起到了很好的作用，利用礦物與修復液的共同作用可以修復微裂紋，有利于混凝土抗折強度的恢復。 Abstract: Through mixing minerals into the cement mortar specimen, the effects of minerals on the flexural strength of concrete are tested. In conditions of optimum adding amount of minerals, adding the repair liquid, the strength recovery rate is tested. And by comparison, adding repair fluid may be played a very good role on the micro crack repair of concrete, and both adding minerals and repair liquid can repair micro cracks, which is conducive to the recovery of concrete’s flexural strength.

非洲沙漠特細砂配制高強泵送混凝土的研究

陳曉剛1，鄒文裕1，陳建軍2，韓立1

２０13年第5期

摘要

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摘??要：通過工程實例，對利用非洲西部沙漠特細砂配制高強泵送混凝土進行了分析和闡述。結果表明，通過不同比例沙漠特細砂和0～3mm石屑的復配，可以配制出滿足工程要求的高強泵送混凝土。Abstract:Throughthepracticalproject,thehighstrengthpumpingconcretepreparedbydesertultra-finesandinwesternAfricaisanalyzedanddiscussed.Theresultsshowthatusingthedifferentratiosdesertultra-finesandand0～3mmstonepowder,thehighstrengthpumpingconcretecanbeprepared,whichcansatisfytheengineeringrequirements.

預應力混凝土管樁粘皮、麻面的成因及處理

蔣元海1,劉紅飛1,薛力梨1,黃發軍1,吳金磚2,曾少雷2

２０13年第5期

摘要

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摘要：分析了預應力混凝土管樁生產中發生樁身混凝土粘皮、麻面等影響產品外觀質量的主要成因，并提出了相應的預防措施。 Abstract：The main reasons of affecting the appearance quality of prestressed concrete pile body such as ixoderm, pockmark, etc. are analyzed during the production of piles, and effective prevention measures to solve the quality defects are put forward.

復合載體夯擴樁承載力試驗和有限元分析

王虎妹1，張力霆2，游昕穎1，馬麗君1

２０13年第5期

摘要

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摘要：結合現場靜載試驗和有限元計算，分析了復合載體夯擴樁的承載力性狀。實踐證明，復合載體夯擴樁可大幅度提高樁基承載能力和減少地基沉降，具有明顯的經濟效益和廣泛的應用前景，是一項值得大力推廣的技術。 Abstract: Combining with finite element analysis and the field static load test, the bearing capacity characteristics of the ram-compaction piles with composite bearing base are analyzed. The practice shows that the new pile foundation can not only increase the bearing capacity of the ground, but also reduce the settlement. Because it's effective in ground treatment and also economical, the technology is worthy to be spread greatly.

酸性土壤對雙摻樁基混凝土耐久性的影響

胡文清

２０13年第5期

摘要

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摘要：利用雙摻技術配制出強度等級為C30、C40的樁基混凝土，并進行特殊環境下的耐久性試驗研究。結果表明：在本試驗條件下，C40混凝土在20次循環后沒有發生破壞，對其脫落物進行XRD分析發現主要侵蝕產物為石膏及鈣礬石。因此，要提高樁基的耐久性以及服役壽命必須提高樁基自身的防腐性能，主要措施為優化混凝土配合比、選用粉煤灰、礦粉雙摻及堿性組分等。 Abstract: The double admixing technology is used to prepare strength grade of C30,C40 pile foundation concrete, and the durability tests are studied in the special environment. The results show that the C40 concrete has not been destructed after 20 cycles under the conditions of the test. It is found that the main erosion products are gypsum and AFt by the XRD analysis of its exfoliation. In order to improve the durability and service life of pile foundation, its corrosion resistance performance must be improved, and the main measures include the optimization of concrete proportion, the use of fly ash and slag admixture, and the use of alkaline component and so on.

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