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    蘇州混凝土水泥制品研究院有限公司

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    節能與環保

    磷石膏基復合材料的制備及性能研究
    磷石膏基復合材料的制備及性能研究
    • 柏 潔1,周 華2,謝嘉驥3,文 偉1,丁俊豪1,馮選輝1
    2021年第12期
    摘要
    引用本文
    摘 ? 要:以磷石膏、粉煤灰、礦渣微粉、生石灰為主要原料制備了磷石膏基復合材料,研究了磷石膏基復合材料性能的影響因素,并通過多變量數值分析得到了最優配合比。結果表明:當磷石膏、粉煤灰、礦渣微粉、生石灰的質量比為1∶0.4∶0.06∶0.03時,制備的磷石膏基復合材料的抗壓、抗折強度均較高;摻入6‰防水劑對磷石膏基復合材料的抗壓強度提升較大,復摻3‰減水劑+3‰防水劑對抗折強度提升較大;當水膠比為0.38~0.40時,磷石膏基復合材料的強度較高;21 ℃蒸汽養護14 d可使磷石膏基復合材料的強度達到最佳,但蒸汽養護會導致磷石膏基復合材料的吸水率增大、軟化系數降低;通過數值分析建立的多變量磷石膏基復合材料的強度計算公式,可以得出單一變量下磷石膏基復合材料的強度值和多變量下磷石膏基復合材料的強度值與對應原材料摻量之間的關系。 Abstract: The phosphogypsum-based composites were prepared with phosphogypsum, fly ash, slag powder and quicklime as main raw materials. The factors affecting the performance of phosphogypsum-based composites were studied, and the optimal mix proportion was obtained through multivariate numerical analysis. The results show that when the mass ratio of phosphogypsum, fly ash, slag powder, and quicklime is 1∶0.4∶0.06∶0.03, the compressive and flexural strengths of the prepared phosphogypsum-based composite materials are higher. The compressive strength of phosphogypsum-based composites is greatly improved by adding 6‰ water-repellent agent, and the flexural strength of phosphogypsum-based composites is greatly improved by adding 3‰ water-reducing agent + 3‰ water-repellent agent. When the water-binder ratio is 0.38~0.40, the strength of phosphogypsum-based composites is higher. Steam curing at 21 ℃ for 14 days can optimize the strength of phosphogypsum-based composites, but steam curing will increase the water absorption and decrease the softening coefficient of phosphogypsum-based composites. Through the strength calculation formula of multivariable phosphogypsum-based composites established by numerical analysis, the relationship between the strength value of phosphogypsum-based composites under single variable and the strength value of phosphogypsum-based composites under multivariable and the corresponding raw material content can be obtained.
    柏潔,周華,謝嘉驥,等.磷石膏基復合材料的制備及性能研究[J].混凝土與水泥制品,2021(12):94-99. BAI J,ZHOU H,XIE J J,et al.Study on the Preparation and Performance of Phosphogypsum-based Composites[J].China Concrete and Cement Products,2021(12):94-99.
    再生粗骨料品質和摻量對再生混凝土力學性能的影響
    再生粗骨料品質和摻量對再生混凝土力學性能的影響
    • 陳旭勇,劉 榴,程書凱,屠艷平,肖雪皓
    2021年第12期
    摘要
    引用本文
    摘 ? 要:采用兩種再生粗骨料(RAⅠ、RAⅡ)分別替代30%、50%、70%、100%的天然粗骨料,以及將兩種再生粗骨料以不同質量比(mRAⅠ∶mRAⅡ=1∶3、1∶1、3∶1)混合后替代30%、50%、70%、100%的天然粗骨料制備了再生混凝土,研究了不同再生粗骨料的品質和摻量對再生混凝土抗壓強度、劈裂抗拉強度和軸心抗壓強度的影響。結果表明:再生混凝土的抗壓強度、劈裂抗拉強度和軸心抗壓強度均隨著再生粗骨料摻量的增加而降低;當再生粗骨料摻量一定時,再生混凝土的力學強度隨著mRAⅠ∶mRAⅡ的增大而增大;參考GB 50010—2010《混凝土結構設計規范》建立的再生混凝土軸心抗壓強度與立方體抗壓強度關系式的擬合效果較好。 Abstract: Recycled concrete was prepared by using two kinds of recycled coarse aggregate(RAⅠ, RAⅡ) to replace 0, 30%, 50%, 70% and 100% natural coarse aggregate respectively, and using mixed recycled coarse aggregate (mRAⅠ∶mRAⅡ=1∶3, 1∶1, 3∶1) to replace 0, 30%, 50%, 70% and 100% natural coarse aggregate. The effects of different quality and content of recycled coarse aggregate on the compressive strength, splitting tensile strength and axial compressive strength of recycled concrete were studied. The results show that the compressive strength, splitting tensile strength and axial compressive strength of recycled concrete decrease with the increase of recycled coarse aggregate content. When the content of recycled coarse aggregate is constant, the mechanical properties of recycled concrete increase with the increase of mRAⅠ∶mRAⅡ. The relationship between the axial compressive strength and the cubic compressive strength of recycled concrete established by referring to GB 50010—2010 Code for Design of Concrete Structures has a good fitting effect.
    陳旭勇,劉榴,程書凱,等.再生粗骨料品質和摻量對再生混凝土力學性能的影響[J].混凝土與水泥制品,2021(12):89-93. CHEN X Y,LIU L,CHENG S K,et al.Effect of Recycled Coarse Aggregate Quality and Content on Mechanical Properties of Recycled Concrete[J].China Concrete and Cement Products,2021(12):89-93.
    基于正交試驗的機制砂自密實輕骨料混凝土配合比設計
    基于正交試驗的機制砂自密實輕骨料混凝土配合比設計
    • 張淑云,周 杰,張 政,秦 卿
    2021年第12期
    摘要
    引用本文
    摘 ? 要:采用固定砂石體積法和改進的全計算法,設計了C40機制砂自密實輕骨料混凝土的配合比,并通過正交試驗分析了機制砂自密實輕骨料混凝土的抗壓強度和工作性。結果表明:當水膠比為0.37、體積砂率為51%、Ⅰ級粉煤灰替代率為20%、硅灰替代率為4%、聚羧酸高性能減水劑摻量為1%時,能夠滿足C40機制砂自密實輕骨料混凝土的相關性能要求。 Abstract: Using the fixed gravel volume method and the improved total calculation algorithm, the mix proportion of C40 machine-made sand self-compacting lightweight aggregate concrete was designed, and the compressive strength and workability of machine-made sand self-compacting lightweight aggregate concrete were analyzed through orthogonal test. The results show that when the water-binder ratio is 0.37, the volume sand ratio is 51%, the substitution rate of grade Ⅰ fly ash is 20%, the substitution rate of silica fume is 4%, and the content of polycarboxylic acid high-performance water-reducing agent is 1%, C40 machine-made sand self-compacting lightweight aggregate concrete can meet the relevant performance requirements.
    張淑云,周杰,張政,等.基于正交試驗的機制砂自密實輕骨料混凝土配合比設計[J].混凝土與水泥制品,2021(12):84-88,93. ZHANG S Y,ZHOU J,ZHANG Z,et al.Mix Proportion Design of Machine-made Sand Self-compacting Lightweight Aggregate Concrete Based on Orthogonal Test[J].China Concrete and Cement Products,2021(12):84-88,93.
    煤矸石活性激發及其膠砂力學性能試驗研究
    煤矸石活性激發及其膠砂力學性能試驗研究
    • 丁 莎1,2,陳霽溪3,關 虓2,3
    2021年第12期
    摘要
    引用本文
    摘 ? 要:以煤矸石為原料,利用機械球磨法粉碎煤矸石,并將其與不同的化學激發劑混合,制得了活性不一的煤矸石粉。通過正交試驗,研究了煤矸石粉摻量、化學激發劑種類和摻量對煤矸石膠砂抗壓強度的影響,利用X射線衍射(XRD)和掃描電鏡(SEM)分析了煤矸石粉的礦物組成和微觀形貌。結果表明:機械球磨破壞了煤矸石的層狀結構,提高了其表面活性;以10%摻量的煤矸石粉等質量替代水泥,并摻入2%的Ca(OH)2激發劑,可加快煤矸石粉的二次水化,對應膠砂試件的抗壓強度達到最大。 Abstract: Coal gangue powder with different activity was prepared by mechanical ball milling and mixing with different chemical activators. Through orthogonal test, the influence of coal gangue powder content, chemical activator type and content on the compressive strength of coal gangue mortar was studied, and the mineral composition and micro morphology of coal gangue powder were analyzed by X-ray diffraction(XRD) and scanning electron microscope(SEM). The results show that mechanical ball milling destroys the layered structure of coal gangue and improves its surface activity. By replacing cement with 10% coal gangue powder and adding 2% Ca(OH)2 activator, the secondary hydration of coal gangue powder can be accelerated, and the compressive strength of corresponding mortar specimen can reach the maximum.
    丁莎,陳霽溪,關虓.煤矸石活性激發及其膠砂力學性能試驗研究[J].混凝土與水泥制品,2021(12):79-83. DING S,CHEN J X,GUAN X.Experimental Study on Active Excitation of Coal Gangue and Mechanical Properties of Mortar[J].China Concrete and Cement Products,2021(12):79-83.
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