第七期_2012_《混凝土與水泥制品》雜志社

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第七期

改性淀粉作為混凝土緩凝減水劑的性能研究

趙平1，嚴云1,2，胡志華1,2

２０12年第7期

摘要

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摘要：試驗研究了一種改性淀粉作為水泥緩凝減水劑的性能。結果表明，改性淀粉減水劑最佳摻量為0.3%，具有較強的緩凝作用，水泥初期水化反應緩慢，水化誘導期明顯延長，有利于水化產物的均勻分布，對膠砂和混凝土的抗壓強度有明顯的增強作用。 Abstract: The performance of the modified starch as water-reducing retarder for cement is studied by the experiment. The results show that the optimum mix dosage of modified starch is 0.3%. Because of its retarding action, the initial hydration of cement is slower and the derivational period of cement hydration is extended, which is in favor of the uniform distribution of hydration products and can significantly improve the compressive strength of cement mortar and concrete.

低溫-常溫循環作用下混凝土力學性能試驗研究

時旭東1，張亮1，鄭建華2，李艷輝2，張天申1

２０12年第7期

摘要

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摘要：通過試驗探討了不同低溫和回至常溫循環作用下混凝土的受力性能。結果表明，隨低溫值的降低，混凝土的低溫抗壓強度和彈性模量均不斷提高，至-130℃附近達最大增幅，而回至常溫時卻呈線性緩慢惡化趨勢。兩種溫度作用工況下的峰值應變變化很小，混凝土的低溫收縮應變隨低溫值的降低開始很小，后呈線性狀增大，經歷低溫回至常溫后的殘余應變也具有同樣的變化特性，試驗結果為超低溫混凝土結構設計提供了一定參考。 Abstract：The mechanical properties of concrete undergoing the action from cryogenic temperatures (CTs) and CTs back to normal temperatures cycle (CTCs) are discussed by the tests. From the test results it can be shown that the compressive strength and elastic modulus of concrete increase with the decline in the CTs, and reach their ultimate values at about -130℃, but there are reverse results for the temperature action from CTs back to normal temperatures. The peak strain has little change with the decline in the CTs for the temperature action whether under CTs or CTCs. The shrinkage strain at CTs has little change at first and then increases linearly with the decline in the CTs, and the residual strain for the CTCs action has a similar changing regularity. These research results can provide references to the design of concrete structures at CTs circumstances.

表面改性粉煤灰對水泥漿體強度和自收縮的影響

張福恒，鄧敏，莫立武

２０12年第7期

摘要

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摘要：在生石灰激發下，采用水熱-煅燒處理對粉煤灰進行表面改性，利用X射線衍射、掃描電鏡和能譜分析等測試方法對表面改性粉煤灰的物相結構和化學組成進行了表征，并采用背散射掃描電鏡和壓汞儀研究了摻表面改性粉煤灰水泥漿體的微觀結構。試驗測定了摻表面改性粉煤灰的硅酸鹽水泥漿體的抗壓強度、自收縮和孔隙率。結果表明，表面改性粉煤灰顆粒表面生成了具有水化活性的β-C2S，其水化產生凝膠，明顯改善了復合水泥漿體中粉煤灰顆粒與水泥基體的界面，降低了復合水泥漿體的孔隙率和自收縮，提高了摻表面改性粉煤灰復合水泥漿體的早期強度。 Abstract: The surface of fly ash particles is modified by the hydrothermal-calcination treatment method via the addition of quick lime. The mineral phases and chemical compositions of the modified fly ash are analyzed by X-ray diffraction and scanning electron microscope equipped with energy dispersive spectroscopy, and the microstructure of cement pastes with the modified fly ash are studied by the backscattered electron microscope and mercury porosimeter. The effects of the modified fly ash on compressive strength, autogenous shrinkage and porosity of the composite cement pastes are investigated. The results show that β-C2S phase is formed on the surface of the modified fly ash particles. Due to the hydration of the β-C2S, which can obviously improve the interface between the fly ash particles and the cement basis of the composite cement pastes, the porosity and autogenous shrinkage of the composite cement pastes are decreased, and the early strength of the composite cement pastes with the modified fly ash is improved.

不同類型水性聚合物水泥凈漿的制備與性能研究

李真，水亮亮，劉瑾

２０12年第7期

摘要

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摘要：選用 “WWJF 8020”型聚乙烯醋酸乙烯酯（EVA乳膠粉）以及“05-88”型聚乙烯醇（PVA）對水泥凈漿進行改性，并與普通水泥凈漿（OPC）進行對比。結果顯示，兩種水性聚合物的添加對水泥試樣抗折強度均有改善，而PVA則更加顯著；在聚合物漿體中的晶體更好地填充了水泥石中的孔洞及裂紋，以改善其微結構；同時，EVA與水化產物發生反應，且反應生成的乙酸鹽又促進了水泥水化；PVA的加入則增加了C-S-H的聚合度；對于不同齡期聚合物水泥試樣的水化進程，EVA及PVA有不同程度的影響。 Abstract: The "WWJF 8020" type polyethylene vinyl acetate (EVA latex powder) and "05-88" type of polyvinyl alcohol (PVA) are selected to improve the properties of cement pastes, and compared with ordinary Portland cement pastes (OPC), the research results show that EVA powder and PVA can both improve the flexural strength of the cement samples, and the status of crystals which fill up the holes and cracks in polymer-modified cement pastes is better than the ones in OPC samples. And in this status the microstructure of cement pastes can be improved. The use of infrared analysis is aware of that EVA powder could react with cement hydration products and the product of calcium acetate promotes the process of cement hydration, while PVA increases the degree of polymerization of the C-S-H. Finally, XRD analysis shows that the EVA powder and PVA in different curing times could have different effects on the process of hydration of polymer-modified cement pastes.

粉煤灰高硅貝利特水泥強度試驗研究

回志峰1，周丹2

２０12年第7期

摘要

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摘要：研究了三氧化硫、硫-硼復合以及硫-鈦復合對粉煤灰高硅貝利特硫鋁酸鹽水泥抗壓強度的影響。從試驗結果分析，氧化物的加入對水泥的早期強度有不同程度的積極作用，但由于粉煤灰本身玻璃體含量較多，不能完全生成礦物，有一定量的游離氧化鈣殘存，因此會影響后期強度的增加幅度。而硫-鈦組因為氧化鈦可以吸收部分游離氧化鈣形成鈣鈦礦，有效抑制了安定性不良引起的強度損失，與其它組穩定劑相比，具有較高的后期強度。 Abstract: The effects of the sulfur trioxide, sulfur boron compound and sulfur titanium compound on the compressive strength of high silicon cement with fly ash belite sulphoaluminate are studied. From the test results, adding the oxide into cement is positive to the early strength of cement, but due to the fly ash with more vitreous content, the fossil cannot be generated totally, and a certain amount of free calcium oxide is remnant, which would affect the increase of the later strength. While the group of sulfur titanium compound can absorb a part of the free calcium oxide to form the perovskite, which can effectively inhibit the strength loss caused by the poor stability, and compared with the other stabilizers, the group of sulfur titanium compound has higher later strength.

論埋地PCCP管道的防腐措施

李世龍

２０12年第7期

摘要

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摘要：從PCCP管道的自防腐性能著手，介紹和比較了在嚴酷環境條件下目前國內外常用的各種PCCP管道的防腐措施，并提出了埋地PCCP管道防腐設計的實用準則和推薦復合防腐措施。 Abstract:Based on the self anti-corrosion property of PCCP, nowadays, commonly used various measures for buried PCCP pipelines in severe environment are introduced and compared. Some design criteria for corrosion protection for buried PCCP pipelines in severe environment are put forward. And the composite anti-corrosion measure for the PCCP pipelines is recommended.

PHC管樁混凝土免壓蒸技術研究

張建綱1,2，毛永琳1,2，喬敏1,2

２０12年第7期

摘要

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摘要：針對PHC管樁生產過程中壓蒸養護能耗大、混凝土耐久性較差的問題，開發了具有早強功能預制構件專用的聚羧酸減水劑，并進行了PHC管樁混凝土的免壓蒸工藝技術研究。結果表明，通過使用新型聚羧酸減水劑，混凝土在90℃條件下養護5h，其抗壓強度可達到80MPa以上，隨著齡期的發展，抗壓強度持續增長，并且能夠減少混凝土離心成型過程產生的余漿。與現有壓蒸工藝制備的混凝土相比，混凝土耐久性有了較大的改善。 Abstract: Aiming at some problems during the process of PHC pile production, such as much energy consumption for autoclave curing, bad durability of concrete, a new kind of polycarboxylic acid superplasticizer for prefabricated components with early strength function is introduced and non-autoclaved process of PHC pile concrete is studied. The results show that the compressive strength of concrete with the new kind of polycarboxylic acid superplasticizer can reach over 80MPa immediately after 5h non-autoclaved curing at 90℃. And the strength will increase steadily with increasing the ages of concrete by using the new superpasticizer, meanwhile, it can reduce surplus paste from centrifugal moulding process of the concrete. Compared with the concrete by the current autoclaved curing, the durability of concrete by non-autoclaved curing is improved obviously.

應用QC小組活動提高地鐵管片外觀質量合格率

張朋，楊冬梅

２０12年第7期

摘要

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摘要：由于采用自動生產線工藝，每個工序須在節拍時間內一次完成。如果設備管理和人員操作不到位，在后續生產過程中很難補救，容易導致管片成品外觀質量出現問題。針對該情況，采用QC小組活動方法，通過調查統計，找出了影響管片外觀質量的2個主要問題。分析提煉出產生以上問題的3個要因，并有針對性地采取措施，成功將重慶地鐵6號線管片外觀質量的合格率提高到了98.06%。 Abstract: Each process of the automatic metro segments production line processes must be completed within the specified time. If device management and workers improperly operate, it’s hard to remedy the errors in the subsequent production process, which will result in quality problems of metro segments. For solving the problem, QC group members of a factory in Chongqing finds out two main problems that influence the appearance quality of the segment by investigation and statistics, and abstracts three reasons why caused the two problems. Thus, taking corresponding measures, the segment appearance qualified rate of Chongqing Metro line 6 is increased up to 98.06%.

高強鋼筋聚丙烯纖維混凝土梁受彎性能試驗研究

戎賢，張健新，李艷艷

２０12年第7期

摘要

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摘要：為研究高強鋼筋聚丙烯纖維混凝土梁在集中荷載作用下的受彎性能，對6根摻量不同的聚丙烯纖維矩形截面梁進行了試驗研究，對比分析了高強鋼筋聚丙烯纖維混凝土梁的受彎承載力、正常使用階段的裂縫寬度及變形。結果表明，高強鋼筋聚丙烯纖維混凝土梁受力性能和普通鋼筋混凝土梁相同；高強鋼筋聚丙烯纖維混凝土梁的受彎承載力、撓度及裂縫寬度均可以按照現行GB 50010—2010《混凝土結構設計規范》中相關公式計算。 Abstract: In order to investigate the bending behavior of polypropylene fiber concrete beam with high strength steel bars, 6 rectangular section beams with different dosages of polypropylene fiber are tested. The bending capacity, crack width and deformation of polypropylene fiber concrete beams reinforced with high strength steel bar are analyzed. The results show that the mechanical property of polypropylene fiber concrete beams reinforced with high strength steel bar is the same as the common reinforced concrete beams. The bending capacity, deflection and crack width of polypropylene fiber concrete beams reinforced with high strength steel bar can still be calculated according to GB50010-2010 .

路用橡膠粉-聚丙烯纖維混凝土力學性能研究

王勃1，譚亞云2，李宏波2,3，鄒媛媛2

２０12年第7期

摘要

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摘要：為了研究橡膠粉和纖維不同摻量協同作用對路用混凝土的抗折強度和延性等力學性能的影響，進行了22組試驗，分別對基準混凝土、橡膠粉混凝土和橡膠粉纖維混凝土進行了抗壓強度、抗折強度和劈裂強度試驗。試驗結果表明，橡膠粉-纖維可改善路用混凝土的韌性，對于60目橡膠粉+10mm纖維混凝土，橡膠粉摻量控制在6%以內，纖維摻量控制在0.5%以內為佳；對于60目橡膠粉+20mm纖維混凝土，橡膠摻量控制在2%以內，纖維摻量控制在0.5%以內為佳。 Abstract: In order to investigate the influences of the synergistic reaction between fiber and rubber powder on flexural strength and extension of concrete used in subgrade, 22 groups test are conducted, which include compressive strength, flexural strength and splitting strength of standard concrete, rubber concrete and fiber-rubber concrete. The results show that in order to improve the toughness of fiber-rubber concrete, for 60 mesh rubber powder+10mm fiber concrete, the content of rubber should be controlled by less than 6%, and the content of fiber should be controlled by less than 0.5%; and for 60 mesh rubber powder+20mm fiber concrete, the appropriate content of rubber is less than 2% and the content of fiber is less than 0.5%.

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