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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

    再生集料種類對再生細石混凝土強度影響研究
    再生集料種類對再生細石混凝土強度影響研究
    • 阮雪琴1,鄭 剛2,賀會團1
    2014年第4期
    摘要
    引用本文
    摘 要:研究了經破碎后不同再生集料種類、摻入量、粉煤灰摻量三種因素對再生細石混凝土強度的影響。結果表明,混凝土再生集料所配制的C20再生細石混凝土的早期、后期強度可與天然細石混凝土強度相當,本試驗條件下,混凝土再生集料取代率在60%時,試件的7d和28d抗壓強度甚至比天然細石混凝土更高;砂漿再生集料和碎磚再生集料配制的再生細石混凝土的早期、后期強度均低于天然細石混凝土強度,且隨著砂漿再生集料、碎磚再生集料取代率的增加而明顯下降;摻有粉煤灰的再生細石混凝土摻量在20%以內時28d的抗壓強度略高于未摻粉煤灰的再生細石混凝土強度。 Abstract: The effects of recycled aggregate types, the replacement ratio of recycled aggregate and fly ash after simple crushing on the compressive strength of recycled fine aggregate concrete are studied. The results show that early and later strengths of the C20 recycled fine concrete with concrete recycled fine aggregate are almost consistent with those of natural fine concrete. When the replacement ratio of concrete recycled fine aggregate is up to 60%, the 7d and 28d compressive strengths of the concrete are higher than those of natural fine concrete, but the early and later strengths of recycled fine aggregate concrete with mortar recycled aggregate or brick recycled aggregate are lower than those of natural fine concrete, and with the increasing of mortar or brick recycled aggregate contents, the strength of recycled fine aggregate concrete decreases significantly; when the replacement ratio of fly ash is within 20%, 28d compressive strength of recycled fine aggregate concrete is slightly higher than that of recycled fine aggregate concrete with fly ash.
    鹽溶液對尾礦砂PVA水泥基復合材料腐蝕試驗研究
    鹽溶液對尾礦砂PVA水泥基復合材料腐蝕試驗研究
    • 委玉奇1,張少峰2
    2014年第4期
    摘要
    引用本文
    摘??要:通過試驗探討了質量分數為5%的CaCl2對尾礦砂PVA水泥基復合材料抗壓性能和抗彎性能的影響。結果表明,尾礦砂PVA水泥基復合材料具備良好的抗腐蝕效果,經腐蝕后材料試樣破壞前依舊出現多裂縫現象,呈現韌性破壞特征并屬于韌性材料,試驗測知該材料經腐蝕后的預測拉伸應變為3.3%。Abstract:Throughexperiment,theeffectof5wt%CaCl2onthecompressiveperformanceandflexuralbehaviorofthetailorePVAcement-basedcompositesisdiscussed.TheresultsshowthatthetailorePVAcementbasecompositeshaveagoodcorrosionresistanceproperty.Aftercorrosionandbeforedestruction,materialsamplesstillappearmanycracks,andpresentductilefailurecharacteristics.Inaddition,it’spredictedthatthetensilestrainofthematerialaftercorrosionis3.3%baseonthetestresults.
    廢棄碎磚骨料再生混凝土配合比設計與早期強度試驗
    廢棄碎磚骨料再生混凝土配合比設計與早期強度試驗
    • 陳 萌,畢蘇萍
    2014年第4期
    摘要
    引用本文
    摘 要:依照普通混凝土配合比的計算方法,并增加碎磚骨料經24h的附加水量,對不同碎磚骨料取代率(0,30%,50%和100%)的C20、C30和C40再生混凝土進行了配合比的設計;隨著碎磚骨料取代率的增大,再生混凝土的抗壓強度隨之減小,當碎磚骨料取代率為50%時,再生混凝土的工作性和混凝土強度等指標達到最優;以碎磚骨料取代率為50%的再生混凝土試驗數據為基礎,回歸得出了不同強度等級再生混凝土在不同齡期的抗壓強度統一計算公式。 Abstract: According to the mix calculation method of normal concrete and increasing the additional water of brick aggregate after 24h, the mix proportions of C20, C30 and C40 recycled concrete in different brick aggregate replacement ratio (0%, 30%, 50% and 100%) are calculated. With the increasing of the brick aggregate contents, the compressive strength of recycled concrete decreases. When the brick aggregate replacement ratio is equal to 50%, the workability and the compressive strength can achieve the optimal result. Based on the test data of 50% brick aggregate replacement ratio, the unified compressive strength calculation formula is proposed for the different strength grade recycled concrete at different age. The calculation basis is provided for the prediction of early compressive strength.
    CRTSII型板式無砟軌道CA砂漿施工技術
    CRTSII型板式無砟軌道CA砂漿施工技術
    • 苗蘭弟1,任慶國1,穆高鋒2
    2014年第4期
    摘要
    引用本文
    摘 要:結合合蚌高速鐵路工程,介紹了CRTSⅡ型板式無砟軌道CA 砂漿施工工藝,并提出了相應的質量控制措施。 Abstract:Based on the construction of Hefei-Bengbu high-speed railway,the construction techniques of CA mortar for CRTSⅡ slab ballastless track are introduced, and the quality control measures are put forward.
    圓環形支撐在某大型基坑支護中的設計應用
    圓環形支撐在某大型基坑支護中的設計應用
    • 李 濤
    2014年第4期
    摘要
    引用本文
    摘 要:結合某大型深基坑地鐵車站工程,采用有限元分析方法,運用不同的計算模型,對整個基坑的施工開挖過程各工況進行了模擬。通過模型計算參數的合理設置及對力學和變形性能的對比分析,系統地分析了設計及施工過程中應注意的問題。 Abstract: Combining with the example of a large subway station deep foundation engineering and using different calculation models, the whole excavation process of pits is simulated under various conditions using the finite element analysis. The questions in the course of design and construction are systematically analyzed, through a reasonable set of parameters of the model and a comparison analysis on the mechanical and deformation performance.
    寒區草磚復合鋼絲網砂漿自承重節能墻體應用研究
    寒區草磚復合鋼絲網砂漿自承重節能墻體應用研究
    • 呂 春1,趙曉斌2,張道明1,王丹丹1,郭國梁1,郭 建1,楊 楠1
    2014年第4期
    摘要
    引用本文
    摘 要:采用草磚、鋼絲網砂漿及聚丙烯纖維砂漿協同作為承重墻體的各部分,有效增加了草磚墻體的承重效果,達到了承重、保溫、裝飾的統一。對原材料的選用、草磚自承重墻體的施工工藝進行了闡述,解決了草磚墻體自承重方面的難題。該工藝建造方式簡單、速度快,能夠承受較大的荷載,變形小,同時符合防火、抗震、節能、環保等要求。 Abstract: Taking straw brick, steel mesh mortar and polypropylene fiber mortar as parts of the body of a load-bearing wall can effectively increase the load-bearing properties of straw brick wall, which achieve the goals of load-bearing, insulation and decorative. The selection of raw materials, the construction technology of straw brick self-bearing walls are expounded. The problem of self-bearing wall is solved. The construction process is simple, fast, able to withstand large loads, and the deformation is small, meanwhile, it can also meet the fire performance, earthquake, energy saving and environmental protection requirements.
    建筑垃圾及陶粒生產輕質自保溫砌塊的研究
    建筑垃圾及陶粒生產輕質自保溫砌塊的研究
    • 林麗娟,劉 偉,田國華,繆正坤
    2014年第4期
    摘要
    引用本文
    摘 要:利用廢棄混凝土、陶粒為粗骨料,復合硅酸鹽水泥并摻加粉煤灰、高效減水劑制成的輕質自保溫砌塊的新型墻體材料,具有輕質、造價低、高耐久性、高耐火性、保溫隔熱等特點,可有效改善墻體保溫性能,滿足寒冷地區節能標準的要求。 Abstract: Taking waste concrete and ceramicite as coarse aggregate, and adding the composite portland cement, fly ash and high-range water-reducing admixture, a new kind of wall material named lightweight self-conserving block are produced. The new kind block has great properties such as light weight, low cost, high durability, high fire resistance and heat-insulating, etc, and it can meet the demands of energy-efficiency standard in cold area.
    不同秸稈填料對鎂質水泥輕質砌塊性能的影響
    不同秸稈填料對鎂質水泥輕質砌塊性能的影響
    • 金開鋒1,張秋平1,張潤芳2,徐 明1
    2014年第4期
    摘要
    引用本文
    摘 要:以青稞、玉米、水稻秸稈、木屑和鎂質水泥為原料,在常溫常壓下制備鎂質水泥輕質砌塊,研究了制品的性能和特點。結果表明,青稞、玉米、水稻秸稈鎂質水泥砌塊力學性能優于木屑鎂質水泥砌塊,其中青稞秸稈鎂質水泥砌塊綜合性能最優。 Abstract: Using barley、corn、rice straw、sawdust and magnesia cement as raw materials to produce light magnesia cement blocks at normal temperature in air, and the performance and characterizes of these cement products are studied. The experimental results show that the mechanical property of straw magnesia cement block is better than that of the sawdust magnesia cement block, and the highland barley straw magnesia cement block exhibits the best performance.
    ?;⒅樵偕鼗炷僚浜媳葍灮O計
    ?;⒅樵偕鼗炷僚浜媳葍灮O計
    • 陳春紅,朱平華,田 斌
    2014年第4期
    摘要
    引用本文
    摘 要:考慮再生混凝土綜合性能,選取再生粗、細骨料取代率、水膠比和?;⒅閾搅孔鳛殛P鍵影響因素,以抗壓強度、抗折強度、保溫性能和抗凍性能作為評價指標,設計了再生混凝土配合比正交試驗,并運用功效系數法進行了分析。結果表明,水膠比對再生混凝土的抗壓強度和抗凍性能影響最大;隨著再生粗、細骨料取代率增大,混凝土的力學強度下降;?;⒅閾搅康脑黾訒档驮偕炷恋牧W強度,但對其保溫性能具有明顯的改善作用。通過驗證試驗發現,只要合理配置,可以配制28d抗壓強度達到20MPa、導熱系數為0.34 W/(m·K)的?;⒅樵偕鼗炷翂w材料。 Abstract: Considering the performance of recycled aggregate concrete comprehensively, four factors including replacement rates of recycled coarse and fine aggregate, water cement ratio and glazed hollow bead content are selected as key factors, and the compressive strength, flexural strength, thermal conductivity and frost resistance are took as evaluation indices. Orthogonal tests are designed to get the optimal mix proportion, and efficacy coefficient method is used to analyze the test results. The analysis results show that compressive strength and frost resistance of the concrete are most affected by water cement ratio. Mechanical strength of the concrete is deteriorated with increasing the contents of recycled aggregate and glazed hollow bead, but thermal insulation property of the concrete is significantly improved. In addition, the verification test results show that 28d compressive strength of the glazed hollow bead recycled insulation concrete can reach 20MPa, and its insulation resistance can achieve 0.34 W/(m·K) if it’s designed properly.
    緩粘結部分預應力連續梁裂縫寬度計算修正淺析
    緩粘結部分預應力連續梁裂縫寬度計算修正淺析
    • 付 強,岳麗莎,金凌志,何 培,李月霞
    2014年第4期
    摘要
    引用本文
    摘 要:在緩粘結部分預應力混凝土兩跨連續梁受彎試驗研究的基礎上,分析了緩粘結預應力連續梁受力過程的破壞形態、緩粘結力筋與普通力筋粘結性能的差別、及其對梁的裂縫間距和鋼筋應力的影響。在國家現行規范的基礎上對裂縫公式進行了修正,提出了緩粘結部分預應力混凝土梁裂縫寬度的計算公式,計算結果與試驗結果吻合較好。 Abstract: Base on the bending test of retard-bonded prestressed concrete continuous beams, the failure mode of the concrete continuous beams, the differences of bond properties between retard-bonded and normal steels and effects of the two bond properties on crack spacing and reinforcement stressare analyzed. The crack spacing calculated formulas are amended base on the current national standard specification, and the new crack width calculation formula of retard-bonded prestressed concrete beam is put forward. Meanwhile, the verification results show that calculated results coincide well with the experimental results.
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