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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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    節能與環保

    輕質堿渣-氯氧鎂水泥基材料性能研究及孔結構特征分析
    輕質堿渣-氯氧鎂水泥基材料性能研究及孔結構特征分析
    • 余海燕,胡林童
    2022年第4期
    摘要
    引用本文
    摘 ? 要:以堿渣、MgO、MgSO4·7H2O等為主要原材料,制備了輕質堿渣-氯氧鎂水泥基材料,研究了養護溫度、發泡劑摻量、穩泡劑摻量對輕質堿渣-氯氧鎂水泥基材料性能的影響,并對其孔結構進行了分析。結果表明:當養護溫度為60 ℃、發泡劑摻量為5%、穩泡劑摻量為6%時,輕質堿渣-氯氧鎂水泥基材料的各項性能最優,干密度為597 kg/m3、抗壓強度為2.7 MPa、導熱系數為0.21 W/(m·K)、吸水率為15.1%、軟化系數為0.83、28 d收縮率為0.17%。 Abstract: Light alkali residue-magnesium oxychloride cement-based materials were prepared with alkali residue, magnesium oxide and magnesium sulfate heptahydrate as the main raw materials. The effects of curing temperature, foaming agent content and foam stabilizer content on the properties of light alkali residue-magnesium oxychloride cement-based materials were studied, and the pore structure was analyzed. The results show that when the curing temperature is 60 ℃, the content of foaming agent is 5% and the content of foam stabilizer is 6%, the properties of light alkali residue-magnesium oxychloride cement-based materials are the best, with dry density of 597 kg/m3, compressive strength of 2.7 MPa, thermal conductivity of 0.21 W/(m·K), water absorption of 15.1%, softening coefficient of 0.83 and 28 d shrinkage rate of 0.17%.
    余海燕,胡林童.輕質堿渣-氯氧鎂水泥基材料性能研究及孔結構特征分析[J].混凝土與水泥制品,2022(4):78-83. YU H Y,HU L T.Experimental Study on Properties and Pore Structure Characteristics of Light Alkali Residue-magnesium Oxychloride Cement-based Materials[J].China Concrete and Cement Products,2022(4):78-83.
    基于Weibull分布的再生混凝土中鋼筋銹蝕預測
    基于Weibull分布的再生混凝土中鋼筋銹蝕預測
    • 王子健1,彭金貴2,郭 飛2,蘇 睿3,喬宏霞3
    2022年第4期
    摘要
    引用本文
    摘 ? 要:為了解決西部鹽漬土環境下再生混凝土中鋼筋的壽命預測問題,采用電化學測試儀對浸泡在氯鹽溶液中的再生骨料鋼筋混凝土進行了電化學試驗,得到了表征鋼筋腐蝕的腐蝕電流密度及自腐蝕電位兩個指標。利用最小二乘法對Weibull參數做了進一步估計,在Weibull分布函數的基礎上對鋼筋腐蝕后的壽命進行了建模。結果表明:再生混凝土中的鋼筋加速腐蝕至30個月時,其腐蝕電流密度最高為0.058 4 μA/cm2,處于未腐蝕狀態;將鋼筋低腐蝕與中等腐蝕的界限值(0.5 μA/cm2)作為鋼筋達到高腐蝕狀態時的閾值,確定出再生混凝土中鋼筋在第750個月時的可靠度函數開始趨近于零,處于中等腐蝕狀態,從而直觀反映了鋼筋在實際環境中的有效使用壽命,可為再生混凝土中鋼筋的維護與檢測提供參考。 Abstract: In order to solve the problem of steel bar life prediction in recycled concrete in the western saline soil environment, the electrochemical test of recycled aggregate reinforced concrete soaked in chloride solution was carried out by using an electrochemical tester, and the corrosion current density and self-corrosion potential of steel bar were obtained. The least-squares method was used to further estimate the Weibull parameters, and the life of the steel bars after corrosion was modeled based on the Weibull distribution function. The results show that when the steel bar in recycled concrete is accelerated to 30 months, the maximum corrosion current density is 0.058 4 μA/cm2, and ?the steel bars are in non corrosive state. Taking the limit value of low corrosion and moderate corrosion of steel bars(0.5 μA/cm2) as the threshold value when steel bars reach high corrosion state, it is determined that the reliability function of steel bar in recycled concrete begins to approach zero at 750 months and is in the medium corrosive state, which directly reflects the effective service life of the steel bars in the actual environment. It can provide a reference for the maintenance and detection of steel bars in recycled concrete.
    王子健,彭金貴,郭飛,等.基于Weibull分布的再生混凝土中鋼筋銹蝕預測[J].混凝土與水泥制品,2022(4):84-88,93. WANG Z J,PENG J G,GUO F,et al.Prediction of Steel Bar Corrosion in Recycled Concrete Based on Weibull Distribution[J].China Concrete and Cement Products,2022(4):84-88,93.
    全鐵尾礦骨料混凝土的工作性、力學性能及耐久性能研究
    全鐵尾礦骨料混凝土的工作性、力學性能及耐久性能研究
    • 康迎杰1,郭自利1,潘 鵬1,2
    2022年第4期
    摘要
    引用本文
    摘 ? 要:利用鐵尾礦機制砂石完全替代天然砂石,制備了全鐵尾礦骨料混凝土,研究了全鐵尾礦骨料混凝土和天然骨料混凝土的工作性、力學性能和耐久性能差異。結果表明:在工作性方面,需通過調配外加劑的方法來保證全鐵尾礦骨料混凝土良好的工作性;在力學性能方面,全鐵尾礦骨料混凝土的抗壓、抗折和劈裂抗拉強度與天然骨料混凝土相比差別不大;在耐久性能方面,全鐵尾礦骨料混凝土的抗氯離子滲透性能、抗碳化性能、抗凍性能及抗硫酸鹽侵蝕性能均與天然骨料混凝土接近。 Abstract: Using iron tailings machine-made sand and stone to completely replace natural sand and stone, all-iron tailings aggregate concrete was prepared, and the difference between all-iron tailings aggregate concrete and natural aggregate concrete in workability, mechanical properties and durability was studied. The results show that in terms of workability, it is recommended to ensure the good workability of all-iron tailings aggregate concrete by mixing admixtures. In terms of mechanical properties, the compressive, flexural and splitting tensile strength of all-iron tailings aggregate concrete are little different from those of natural aggregate concrete. In terms of durability, the chloride ion penetration resistance, carbonation resistance, frost resistance and sulfate resistance of all-iron tailings aggregate concrete are close to those of natural aggregate concrete.
    康迎杰,郭自利,潘鵬.全鐵尾礦骨料混凝土的工作性、力學性能及耐久性能研究[J].混凝土與水泥制品,2022(4):89-93. KANG Y J,GUO Z L,PAN P.Study on Workability, Mechanical Properties and Durability of All-iron Tailings Aggregate Concrete[J].China Concrete and Cement Products,2022(4):89-93.
    改性磷石膏礦渣水泥在混凝土和路基材料中的應用研究
    改性磷石膏礦渣水泥在混凝土和路基材料中的應用研究
    • 胡 彪,吳赤球,呂 偉,龔文輝
    2022年第4期
    摘要
    引用本文
    摘 ? 要:利用生石灰對磷石膏進行改性,得到改性磷石膏,將改性磷石膏、礦渣粉、水泥按一定比例混合均勻,通過粉磨制得改性磷石膏礦渣水泥,分析研究了改性磷石膏礦渣水泥的性能及改性磷石膏礦渣水泥在混凝土和路基材料中應用的可行性。結果表明:與未改性磷石膏相比,利用改性磷石膏制得的水泥早期強度有所提高;以改性磷石膏礦渣水泥為膠凝材料的混凝土和路基材料的早期強度增長較慢,但中后期強度可實現穩定增長;將改性磷石膏應用于混凝土和路基材料中時,其中的磷、氟等雜質可得到有效固化,對生態環境的影響較小。研制的改性磷石膏相關產品具有良好的結構功能性與安全環保性,已成功應用于道路工程。 Abstract: The phosphogypsum was modified with quicklime to obtain modified phosphogypsum. The modified phosphogypsum, slag powder and cement were mixed uniformly in a certain proportion, and then ground to obtain modified phosphogypsum slag cement. The properties of modified phosphogypsum slag cement and the feasibility of modified phosphogypsum slag cement in concrete and roadbed materials were analyzed. The results show that compared with unmodified phosphogypsum, the early strength of cement prepared with modified phosphogypsum is improved. The early strength growth of concrete and roadbed materials using modified phosphogypsum slag cement as cementitious material is slow, but the strength can achieve stable growth in the middle and late stages. When the modified phosphogypsum is applied to concrete and roadbed materials, impurities such as phosphorus and fluorine can be effectively cured, and the impact on the ecological environment is small. The developed modified phosphogypsum related products have good structural functionality and safety and environmental protection, and have been successfully applied to road engineering.
    胡彪,吳赤球,呂偉,等.改性磷石膏礦渣水泥在混凝土和路基材料中的應用研究[J].混凝土與水泥制品,2022(4):97-99. HU B,WU C Q,LYU W,et al.Study on the Application of Modified Phosphogypsum Slag Cement in Concrete and Roadbed Materials[J].China Concrete and Cement Products,2022(4):97-99.
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