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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

    稻草纖維微粒砂漿物理力學性能試驗研究
    稻草纖維微粒砂漿物理力學性能試驗研究
    • 周孝紅,陳國平,朱水文
    2016年第4期
    摘要
    引用本文
    摘 要:將稻草原材料制成不同粒徑的微粒,并分別按不同摻量制成復合砂漿,通過試驗得到復合砂漿抗折強度、抗壓強度、干縮率以及導熱系數變化規律。研究結果表明,稻草纖維微粒能有效改善砂漿物理力學性能,為節能環保起到有效的推動作用。 Abstract: The different size of particle is produced by straw raw material, composite mortar is made of different dosage of particle. The change rules of the flexural strength, compressive strength, dry shrinkage and thermal conductivity variation of composite mortar is obtained by experiment. The results show that, the straw fiber particle can effectively improve the physical and mechanical properties of the mortar,which can promote the energy saving and environmental protection.
    江寧醫改中心混凝土樁基分析
    江寧醫改中心混凝土樁基分析
    • 蔣躍楠1,萬大前2
    2016年第4期
    摘要
    引用本文
    摘 要:以江寧醫改中心一期工程為依托,探討了樁基礎的設計與施工方法,分析了抗拔樁與抗壓樁的靜載試驗。結果表明,本工程的抗拔樁平均回彈率一般大于抗壓樁;抗拔樁回彈變形中樁身的彈性恢復只是小部分,樁身質量對抗拔樁的變形有一定影響;同一地段發生同等位移條件下,抗壓荷載明顯大于抗拔荷載且荷載差異隨位移的增加而增加;荷載作用下的基樁變形與檢測的間隔時間關系不大。 Abstract: As project of Jiangning hospitalcare center Ⅰ, design and construction method of pile foundation are investigated, static load experimental results of tension pile and compression pile are analyzed. The results show that, average rebound rate of tension pile in this project is more than compression piles; elastic recovery of tension pile in rebound deformation is a small part, there is the influence of pile quality on deformation of tension pile; under the same area and same condition of displacement, compression load is obviously more than tension load, and with increasing the displacement, the load difference is increased; under the role of load,pile deformation and detected interval have little relationship. Key words: Tension pile; Compression pile; Static load experiment; Deformation amout
    對拉式擋土墻穩定性模型試驗研究
    對拉式擋土墻穩定性模型試驗研究
    • 張宏博1,2,解全一1,2,岳紅亞1,2,李 信1,2,馬 源1,2
    2016年第4期
    摘要
    引用本文
    摘 要:為研究對拉式擋土墻失穩時的力學響應規律,設計了室內模型試驗,監測并分析了對拉式擋土墻在傾覆破壞和沉降破壞時墻背側向土壓力分布特征及拉筋應力的變化規律。研究結果表明,在對拉式擋土墻發生傾覆破壞時,傾覆端側向土壓力普遍增大,整體呈拋物線形式,沉降端土壓力普遍減??;單拉筋條件下的沉降破壞,隨著沉降量的增加,拉筋應力逐漸增大,傾覆端土壓力在拉筋作用下呈現出傾覆破壞時的土壓力分布,沉降端土壓力整體呈先增后減的趨勢且拉筋上部土壓力變化幅度遠大于拉筋下部;多拉筋條件下的沉降破壞,上部拉筋鋼筋應力迅速減小,下部拉筋迅速增大,其墻背土壓力與單拉筋條件下的墻背土壓力相似,因此,在易發生不均勻沉降地段的對拉式擋土墻應加強下部拉筋及擋土墻墻身的強度。 Abstract: To study the mechanics response law of mutually anchored retaining wall in unstability, indoor model tests were designed to monitor and analyze changing rules of lateral earth pressure distribution of wall and the changing rules of anchor-bar stress, in the case of overturning and destruction. The results show that, when the tied double retaining wall overturns, end later earth pressures of overturns increase generally, overall forms parabolic, earth pressures of settlement end generally decreases. Under the condition of single rebar, when settlement destruction of the tied double retaining walls happens, with the increase of settlement, rebar stress is increased gradually, under the reaction of rebar, side of overturnings shows earth pressure distribution as overturning, earth pressures of settlement end shows a trend of increasing after decreases first, and earth pressure in upper brace changes bigger than the lower brace; under the condition of multi-strand rebar, when settlement destruction of the tied double retaining walls happens, steel bar stress of upper rebars decreases rapidly, the lower increases quickly, the earth pressure is similar with single rebar, therefore, the tied double retaining wall should strengthen the lower rebar and strength of retaining wall when area easily occurs uneven settlement.
    靜載和疲勞荷載作用下環氧涂層鋼筋混凝土梁的耐久性能
    靜載和疲勞荷載作用下環氧涂層鋼筋混凝土梁的耐久性能
    • 高 路,陸曉彤,高 揚,王小惠,王 菁
    2016年第4期
    摘要
    引用本文
    摘 要:對三組鋼筋混凝土梁在外荷載和服役環境下的耐久性能進行了試驗室模擬研究。運用電化學方法對試件中不同涂層鋼筋和無涂層鋼筋的阻抗進行了測試和等效電路模擬,結合不同試件的裂縫分布,對模擬結果進行了分析。結果表明,環氧涂層能提高鋼筋的耐腐蝕性;加載形式不同會對試件鋼筋銹蝕產生不同影響;隨鹽水腐蝕時間的增加,試件中不同厚度涂層鋼筋的抗銹蝕能力也有不同程度的退化。 Abstract: Laboratory simulation research on the durability behaviour of the three groups of reinforced concrete (RC) beams external load and environment attacks was studied, test and equivalent circuits modeling of impedance for specimen containing different epoxy-coated reinforcing bar and uncoated reinforcing bars by using electrochemical method are carried out, that simulation results are analyzed by combining with cracks distribution of different specimens. The results show that, epoxy coating can provide effective anti-corrosion protection for the reinforcing bars; the corrosion of the reinforcing bars in RC test specimens is influenced by external load. Deterioration of the anti-corrosion protection for reinforcing bars with different coating thicknesses in test specimens is shown with the increase of the simulated seawater solution attack.
    水泥基外墻系統泛堿問題定量表征與抑制方法研究
    水泥基外墻系統泛堿問題定量表征與抑制方法研究
    • 曹天驥1,2,錢春香1,2,郭景強3,曲 軍3
    2016年第4期
    摘要
    引用本文
    摘 要:結合一定條件下的水泥基材料泛堿處理措施與計算機圖像分析技術,提出了一種定量表征水泥基材料泛堿程度的方法?;谠擁椃椒?,研究活性礦物摻合料偏高嶺土對水泥基材料泛堿問題的影響。同時采用熱重分析測試方法分析不同摻量偏高嶺土的水泥基材料內部泛堿物質含量,并研究了偏高嶺土對材料力學性能的影響。結果表明,適宜偏高嶺土可以有效地抑制水泥基外墻系統的泛堿問題并保持其良好的力學性能。 Abstract: A quantitative method to characterize the degree of efflorescence in cement-based material is established based on computer image analysis technology and efflorescence treatment. According to this method, the influence of active mineral admixture-metakaolin on resist efflorescence for cement-based material is studied. Meanwhile, the efflorescence substance in cement-based material with different dosage of metakaolin is tested by TG, and the influence of metakaolin on mechanical properties of materials is investigated. The results indicate that, the proper dosage of metakaolin can effectively maintain the performance of anti-efflorescence and acquire better mechanics for cement-based external wall system.
    南京地區復合相變混凝土砌塊冬季應用效果研究
    南京地區復合相變混凝土砌塊冬季應用效果研究
    • 張維維1,程建杰1,張 源2,何嘉鵬1
    2016年第4期
    摘要
    引用本文
    摘 要:以南京地區冬季的室外空氣綜合溫度為計算條件,利用FLUENT軟件模擬分析了空心混凝土砌塊、EPS外保溫、復合相變混凝土砌塊應用于南向外墻時對空調房間和非空調房間室內熱環境的影響。研究結果表明:對于空調房間和非空調房間,相變石膏板內置時的利用效果均優于外置;對于空調房間,EPS外保溫和內置相變溫度為19℃的相變石膏板的復合相變混凝土砌塊下的內壁面熱流波幅分別較空心混凝土砌塊減小73%、43%,而房間總散熱量分別較空心混凝土砌塊減小6%、45%;對于非空調房間,內置相變溫度為15℃的相變石膏板的復合相變混凝土砌塊下的室內空氣平均溫度分別較空心混凝土砌塊和EPS外保溫提高2.45℃和2.24℃,而溫度波幅分別較空心混凝土砌塊和EPS外保溫減小82%和51%。 Abstract: The outdoor air complex temperature in winter in Nanjing as the calculation conditions, the FLUENT software was used to simulate and analyze the effect of the hollow concrete block (HCB), EPS external insulation (EPS) and the composite phase change concrete block (PCCB) applied in the south facade on the indoor thermal environment of rooms with air conditioners and without air conditioners. The results show that, for the rooms with air conditioners and without air conditioners, the utilization effect of the phase change plasterboard (PCB) in internal putting was better than external putting; for the room with air conditioners, the amplitudes of heat flux on the inner wall surface of EPS and PCCB (the PCB was put in the inner hole, the phase change temperature was 19℃) decreased by 73% and 43% respectively than HCB, and the total heat emission of the room decreased by 6% and 45% respectively than that of HCB; for the room without air conditioners, the average temperature of indoor air of the room with PCCB (the PCB was put in the inner hole, the phase change temperature was 15℃) increased by 2.45℃ and 2.24℃ respectively than HCB and EPS, and the amplitude of the temperature of the indoor air decreased by 82% and 51% respectively than that of HCB and EPS.
    PVA纖維增強水泥基復合材料力學性能研究
    PVA纖維增強水泥基復合材料力學性能研究
    • 劉 桐1,張繼紅2 ,劉友忠3 ,陳 娟4,艾 軍4
    2016年第4期
    摘要
    引用本文
    摘 要:采用彎曲拉伸試驗和抗壓試驗研究了PVA纖維摻量對PVA-FRCC試件力學性能的影響規律。研究結果表明,PVA-FRCC試件的抗彎強度隨著PVA纖維摻量的增加而增大,極限彎曲拉伸應變也隨著纖維摻量的增加而增大;隨著纖維摻量的增加,PVA-FRCC試件的抗壓強度有增大的趨勢,但隨著摻量的進一步增加,抗壓強度開始有降低的趨勢。 Abstract: The influence rule of PVA fiber content on the mechanical performance of PVA-FRCC is studied by using tensile test and compressive test. The results show that, bending strength of PVA-FRCC is increased with the increase of PVA fiber dosage, and the ultimate bending strain is also increased as the increase of fiber content; with the increase of fiber content, there is an increasing trend of PVA-FRCC, however, with the further increase of PVA fiber dosage, compressive strength is decreased.
    聚丙烯纖維噴射混凝土力學性能試驗研究
    聚丙烯纖維噴射混凝土力學性能試驗研究
    • 姚文杰,龐建勇,姚韋靖
    2016年第4期
    摘要
    引用本文
    摘 要:摻入適量聚丙烯纖維可以阻止混凝土開裂、增加抗拉抗剪強度、增強韌性、抗滲性和抗疲勞性,能夠很好地改善混凝土延性和耐久性。本文在完成不同聚丙烯纖維摻量混凝土力學性能對比試驗的基礎上,得出了能夠滿足軟巖隧道噴層支護要求的混凝土配合比。 Abstract: Adding polypropylene fiber concrete can prevent concrete crack, enhance tensile shear strength, toughness, penetration resistance and fatigue resistance, which can effectively improve the concrete ductility and durability. Based on the contrast test of mechanical properties for concrete in this paper, different contents of polypropylene fiber are completed, mix proportion of concrete for spraying layer of soft rock tunnel is satisfied.
    高摻量鋼-聚丙烯混雜纖維高強混凝土抗彎韌性試驗研究
    高摻量鋼-聚丙烯混雜纖維高強混凝土抗彎韌性試驗研究
    • 楊曉東,陶俊林
    2016年第4期
    摘要
    引用本文
    摘 要:通過高摻量鋼-聚丙烯混雜纖維高強混凝土的抗彎試驗得到纖維混凝土的抗彎荷載-撓度曲線,據此分別采用彎曲韌性指數、等效抗彎強度與彎曲韌性比來研究分析不同體積摻量的鋼纖維、聚丙烯纖維混雜后對C60高強混凝土抗彎韌性的影響規律。研究結果表明,鋼纖維混凝土的抗彎強度和韌性均隨著鋼纖維摻量的增加而明顯提高,對鋼纖維摻量一定時的鋼-聚丙烯混雜纖維混凝土而言,存在最優的聚丙烯纖維摻量使得抗彎強度和韌性最大,即出現較好的正混雜效應。 Abstract: The flexural load-deflection curves of fiber concrete is obtained by flexural behavior of hybrid fiber reinforced high strength concrete with high content steel-polypropylene fiber, the influence rules of different volume fraction of steel fiber mixed with polypropylene fiber on the flexural toughness of C60 high strength concrete are studied by flexural toughness index, equivalent bending strength and bending toughness ratio. The research shows that, the flexural strength and toughness of steel fiber reinforced concrete are obviously improved with the increase of steel fiber content, there is an optimal amount of polypropylene fiber, which makes the bending strength and toughness of the steel fiber mixed best, which appears good hybrid effects.
    不同侵蝕環境下PVA-FRCC抗硫酸鹽侵蝕性能研究
    不同侵蝕環境下PVA-FRCC抗硫酸鹽侵蝕性能研究
    • 趙曉明,鄔 迪,劉曙光
    2016年第4期
    摘要
    引用本文
    摘 要:對聚乙烯醇纖維增強水泥基復合材料(PVA-FRCC)在干濕循環和長期浸泡作用下分別進行了抗硫酸鈉侵蝕試驗研究,分析對比了不同侵蝕環境下PVA-FRCC的質量變化、體積變化和抗壓強度變化。結果表明,在纖維摻量小于1%時,侵蝕環境對PVA-FRCC抗硫酸鹽侵蝕性能影響明顯,表現為干濕循環作用下侵蝕劣化程度更嚴重;在纖維摻量大于1%時,侵蝕環境對PVA-FRCC抗硫酸鹽侵蝕性能影響不明顯。 Abstract: The experimental research of polyvinyl alcohol fiber reinforced cementitous composites( PVA-FRCC ) on resist corrosion of sodium sulfate in wet dry cycle and long-term immersion is carried out, the changes of PVA-FRCC on quality, volume and compressive strength under different immersion environment are analyzed and compared. The results show that, when fiber content is less than 1%, the erosion environment has obvious influence on the corrosion resistance of PVA-FRCC, corrosion deterioration degree is more serious under wet dry cycle; as fiber dosage more than 1%, the influence on sulfate attack resistance of PVA-FRCC in corrosion environment is not obvious.
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