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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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    混凝土研究

    基于多元非線性回歸模型的高強混凝土強度預測研究
    基于多元非線性回歸模型的高強混凝土強度預測研究
    • 甘彬霖1,馮旭海2,3,畢經龍1,姜浩亮2
    2022年第2期
    摘要
    引用本文
    摘 ? 要:為準確預測高強混凝土(HSC)的強度變化規律,調研收集了225組HSC配合比及其28 d強度數據,對統計變量進行Spearman相關性分析,并基于enter法建立了不同膠凝體系HSC的28 d強度與配合比之間的多元非線性回歸模型。分析了不同模型預測值與實際值的散點圖、殘差圖數據分布情況,并結合擬合優度指標和相對誤差指標對模型進行了評價。結果表明:硅灰摻量、水膠比、膠凝材料總量和減水劑摻量對HSC的28 d強度影響效果顯著,影響程度依次遞減,P值均小于0.01;3種膠凝體系HSC強度回歸模型的回歸效果和預測精度均能滿足預測要求?;诒疚哪P?,可通過原材料配合比分別對C-F-Si-G四元膠凝體系、C-F-G三元膠凝體系和C-F二元膠凝體系HSC的28 d抗壓強度進行預測。 Abstract: The data base of 225 sets of high-strength concrete(HSC) mix ratio and compressive strength curing for 28 d were established for predicting the strength of HSC accurately. Spearman correlation analysis was performed on statistical variables, and 3 multiple nonlinear regression models of different cementitious systems were established based on the enter method for strength prediction of HSC. The data distribution of scatter plots and residual plots of the predicted values and actual values of different prediction models were analyzed, and the goodness of fit index and the relative error index were also analyzed for model evaluation comprehensively. The results show that the dosage of silica fume, water-binder ratio, binder amount and water reducing agent dosage have a very significant effect on the compressive strength of HSC, the degree of importance decreases successively, and the P value is all less than 0.01. The regression results and prediction accuracy of all the prediction models can meet the prediction requirements. Based on this model, the 28 d compressive strength of HSC of the C-F-Si-G quaternary cementitious system, C-F-G ternary cementitious system and C-F dual cementitious system can be predicted through the different models based on material mixing ratio.
    甘彬霖,馮旭海,畢經龍,等.基于多元非線性回歸模型的高強混凝土強度預測研究[J].混凝土與水泥制品,2022(2):1-7. GAN B L,FENG X H,BI J L,et al.Research on the Multiple Nonlinear Regression Prediction Model for Compressive Strength of High-strength Concrete[J].China Concrete and Cement Products,2022(2):1-7.
    我國鐵路混凝土結構耐久性發展現狀與展望
    我國鐵路混凝土結構耐久性發展現狀與展望
    • 渠亞男1,2,仲新華1,2,王家赫1,2,李享濤1,2,蘇婉玉1,2,謝永江1,2
    2022年第2期
    摘要
    引用本文
    摘 ? 要:總結了我國鐵路混凝土結構耐久性的發展歷程,介紹了我國鐵路混凝土結構耐久性的保障方法,并結合現階段我國鐵路工程建設特點,指出了鐵路混凝土結構耐久性依然面臨服役環境復雜化、原材料資源短缺和過早劣化等挑戰,提出了鐵路混凝土結構耐久性長壽命化、定量化、智能化和可預測性的發展趨勢。 Abstract: The development history for the durability of railway concrete structures in China is summarized, and the guarantee methods for the durability of railway concrete structures in China is introduced. Based on the characteristics of railway engineering construction in China at the present stage, it is pointed out that the durability of railway concrete structures still faces challenges, such as complicated service environment, shortage of raw materials and premature deterioration. The development trends of longer service life, quantification, intelligentization and predictability for the durability of railway concrete structures are put forward.
    渠亞男,仲新華,王家赫,等.我國鐵路混凝土結構耐久性發展現狀與展望[J].混凝土與水泥制品,2022(2):8-12,17. QU Y N,ZHONG X H,WANG J H,et al.Development Situation and Expectation on the Durability of Railway Concrete Structures in China[J].China Concrete and Cement Products,2022(2):8-12,17.
    骨料級配和粉煤灰摻量對透水混凝土性能的影響
    骨料級配和粉煤灰摻量對透水混凝土性能的影響
    • 王 婕,楊建永,張裕顯,劉 建,婁建新,李 俊
    2022年第2期
    摘要
    引用本文
    摘 ? 要:分別選取了不同粒徑(2~5 mm、5~10 mm和10~15 mm)的骨料進行雙粒級混合,在水灰比為0.32的條件下,調整粉煤灰摻量(10%、20%、30%)制備了目標孔隙率為18%的透水混凝土試件。并對試件的抗壓強度、有效孔隙率以及透水系數進行了測試,得出了骨料級配和粉煤灰摻量對透水混凝土抗壓強度和透水性能的影響規律。結果表明:當骨料混合比例m5~10 mm∶m10~15 mm=5∶5 ,粉煤灰摻量為20%時,透水混凝土性能最佳,抗壓強度達到21.2 MPa,透水系數可達到 1.45 mm/s。 Abstract: In order to study the influence of aggregate particle size grading and admixture on the performance of pervious concrete, 2~5 mm, 5~10 mm and 10~15 mm of aggregate particle sizes were selected to mix them in pairs. Under the condition of water-cement ratio of 0.32, 10%, 20% and 30% of fly ash content were selected respectively to prepare pervious concrete test blocks with target porosity of 18%. The influence rules of aggregate gradation and fly ash content on the compressive strength and water permeability of pervious concrete were obtained by measuring the compressive strength, effective porosity and water permeability coefficient of the test block. The results show that when the aggregate mixing ratio m5~10 mm∶m10~15 mm is 5∶5, and the fly ash content is 20%, the pervious concrete has the best performance, the strength can reach 21.2 MPa, and the pervious coefficient is 1.45 mm/s.
    王婕,楊建永,張裕顯,等.骨料級配和粉煤灰摻量對透水混凝土性能的影響[J].混凝土與水泥制品,2022(2):13-17. WANG J,YANG J Y,ZHANG Y X,et al.Influence of Particle Size Gradation of Aggregate and Fly Ash Content on the Performance of Pervious Concrete[J].China Concrete and Cement Products,2022(2):13-17.
    石粉含量對C35混凝土性能的影響及機理分析
    石粉含量對C35混凝土性能的影響及機理分析
    • 張會平,馮月娥
    2022年第2期
    摘要
    引用本文
    摘 ? 要:為了研究石粉含量對中低強度機制砂混凝土性能的影響,設計了4組不同石粉含量的C35機制砂混凝土,并進行了力學性能、耐久性能以及微觀結構測試和分析。結果表明:適量的石粉可以優化混凝土的孔隙結構,有利于提高混凝土的早期抗裂性能、劈裂抗拉強度、抗壓強度和抗氯離子滲透性能;過量的石粉會增加混凝土早期開裂風險,且對混凝土強度不利;建議在配制此類低強度等級混凝土時,機制砂的石粉含量應控制在20%以內。 Abstract: In order to study the influence of manufactured sand powder content on the performance of low and medium strength grade of concrete, 4 groups of C35 manufactured sand concrete with different stone powder content were designed, and the mechanical properties, durability and the microstructure were tested and analyzed. The research results show that the appropriate content of stone powder can optimize the pore structure of concrete, which is beneficial to the improvement the early crack resistance, splitting tensile, compressive strength and chloride ion penetration resistance of concrete. Excessive stone powder will increase the risk of concrete cracking at an early age, and it will have a variety of deteriorating effects on the strength of concrete. It is recommended that the content of manufactured sand powder for the preparation of low strength grade concrete should be controlled within 20%.
    張會平,馮月娥.石粉含量對C35混凝土性能的影響及機理分析[J].混凝土與水泥制品,2022(2):19-21,26. ZHANG H P,FENG Y E.The Influence of Stone Powder Content on the Performance of C35 Concrete and Its Mechanism Analysis[J].China Concrete and Cement Products,2022(2):19-21,26.
    透水混凝土強度與透水系數關系模型研究
    透水混凝土強度與透水系數關系模型研究
    • 曲廣雷1,2,常廣利2,王顯利2,李梓赫3,劉浩宇3,孫祥濤2,李 欣2
    2022年第2期
    摘要
    引用本文
    摘 ? 要:為建立透水混凝土抗壓強度與透水系數的定量關系模型,制備了透水混凝土試件,并測試了試件的有效孔隙率、透水系數和28 d抗壓強度。結合現有模型,建立了基于Griffith斷裂理論的數學關系模型,并驗證了模型的有效性;基于本文提出的模型,選取合適參數,可以對透水混凝土性能進行有效預測。 Abstract: In order to establish a quantitative relationship model between the compressive strength and the permeable coefficient of pervious concrete, pervious concrete specimens were prepared through laboratory tests, and the effective porosity, permeable coefficient and 28 d compressive strength were measured. Combined with the existing model, the mathematical relation model based on Griffith fracture theory was established and the validity of the model was verified. Based on the model proposed in this article, selecting appropriate parameters can effectively predict the performance of pervious concrete.
    曲廣雷,常廣利,王顯利,等.透水混凝土強度與透水系數關系模型研究[J].混凝土與水泥制品,2022(2):22-26. QU G L,CHANG G L,WANG X L,et al.Study on the Relationship Model Between Pervious Concrete Strength and Pervious Coefficient[J].China Concrete and Cement Products,2022(2):22-26.
    酸激發膠凝材料的力學性能與激發原理綜述
    酸激發膠凝材料的力學性能與激發原理綜述
    • 李金丞1 ,王 磊1 ,張曉偉1 ,張棟梁1 ,王覓堂1,2
    2022年第2期
    摘要
    引用本文
    摘 ? 要:綜述了近幾年國內外各類酸激發膠凝材料的研究成果,對酸激發膠凝材料力學性能的相關研究進行了總結,同時對酸激發膠凝材料力學性能的影響因素如酸的種類、酸的濃度、養護條件以及摻外加劑等進行了歸納,還介紹了典型的酸性激發劑磷酸、醋酸、硫酸激發膠凝材料的水化機理和激發過程中所發生的地質聚合反應。 Abstract: The research results of various acid-activated cementitious materials at home and abroad in recent years are reviewed. The related research on the mechanical properties of acid-activated cementitious materials is summarized, and the factors affecting the mechanical properties of acid-activated cementitious materials, such as acid type, acid concentration, curing conditions, and admixtures, are also summarized. The hydration mechanism of the typical acidic activator phosphoric acid, acetic acid, and sulfuric acid to activate the gelling material and the geological polymerization reaction during the excitation process are introduced.
    李金丞,王磊,張曉偉,等.酸激發膠凝材料的力學性能與激發原理綜述[J].混凝土與水泥制品,2022(2):27-31,37. LI J C,WANG L,ZHANG X W,et al.Review on Mechanical Property and Excitation Mechanism of Acid-activated Cementitious Materials[J].China Concrete and Cement Products,2022(2):27-31,37.
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