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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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    第二期

    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.
    混凝土與水泥制品行業“十四五”發展指南(節選)
    混凝土與水泥制品行業“十四五”發展指南(節選)
    • 中國混凝土與水泥制品協會
    2022年第2期
    摘要
    引用本文
    中國混凝土與水泥制品協會.混凝土與水泥制品行業“十四五”發展指南(節選)[J].混凝土與水泥制品,2022(2):97-100.
    鹽霧侵蝕環境下鐵尾礦砂再生混凝土的耐久性試驗研究
    鹽霧侵蝕環境下鐵尾礦砂再生混凝土的耐久性試驗研究
    • 王志齊1,李 濤2
    2022年第2期
    摘要
    引用本文
    摘 ? 要:研究了鹽霧侵蝕環境下不同摻量鐵尾礦砂再生混凝土的抗氯離子侵蝕性能。結果表明:相同條件下,未摻鐵尾礦砂再生混凝土的氯離子侵蝕深度遠高于普通混凝土的氯離子侵蝕深度;隨著鐵尾礦砂摻量的增加,氯離子侵蝕深度先降后增,當鐵尾礦砂摻量為30%~40%時,試件的氯離子侵蝕深度小于普通混凝土和未摻鐵尾礦砂再生混凝土的氯離子侵蝕深度;相同侵蝕深度處的自由氯離子含量隨鐵尾礦砂摻量的增加先降后增,當鐵尾礦砂摻量為40%時,自由氯離子含量總體上達到最低;總氯離子含量隨侵蝕時間的延長變化不大,結合氯離子含量隨侵蝕時間的延長而降低,同時自由氯離子含量隨侵蝕時間的延長而增加。 Abstract: The chloride ion corrosion resistance of recycled concrete with different iron tailings content in salt spray environment was studied. The results show that the chloride ion erosion depth of recycled concrete without iron tailings is much higher than that of ordinary concrete under the same conditions. With the increase of the content of iron tailings, the chloride ion erosion depth decreases first and then increases, and when the content of iron tailings is 30%~40%, the chloride ion erosion depth is less than those of ordinary concrete and recycled concrete without iron tailings. The free chloride ion content at the same erosion depth decreases first and then increases with the increase of the content of iron tailings, and when the content of iron tailings is 40%, the free chloride ion content is generally the lowest. The total chloride ion content does not change much with the extension of erosion time, and the combined chloride ion content decreases with the extension of erosion time, and the free chloride ion content increases with the extension of erosion time.
    王志齊,李濤.鹽霧侵蝕環境下鐵尾礦砂再生混凝土的耐久性試驗研究[J].混凝土與水泥制品,2022(2):92-96. WANG Z Q,LI T.Experimental Study on Durability of Iron Tailings Recycled Concrete in Salt Spray Environment[J].China Concrete and Cement Products,2022(2):92-96.
    利用鋼渣粉制備生態型超高性能混凝土的研究
    利用鋼渣粉制備生態型超高性能混凝土的研究
    • 王思雨1,2,曾 敏3,4,胡方杰3,4,余 睿1,5,水中和1,5,范定強1,6,王金楠1,6,馮 元1,2,譚珺輝2,王武峰5
    2022年第2期
    摘要
    引用本文
    摘 ? 要:研究了鋼渣粉替代部分水泥對超高性能混凝土(UHPC)性能的影響,驗證了利用鋼渣粉部分替代水泥制備生態型UHPC的可行性。結果表明:隨著鋼渣粉替代量的增加,UHPC的工作性得到改善;當鋼渣粉替代量為200 kg/m3時,UHPC的密實度達到最大,且此時UHPC的抗壓強度和抗氯離子滲透性能仍保持較好水平;隨著鋼渣粉替代量的增加,UHPC對生態環境的負面影響逐漸變小。 Abstract: The effect of steel slag powder replacing part of cement on the performance of ultra-high performance concrete(UHPC) was studied, and the feasibility of preparing ecological UHPC by partially replacing cement with steel slag powder was verified. The results show that with the increase of steel slag powder replacement amount, the workability of UHPC is improved. When the replacement amount of steel slag powder is 200 kg/m3, the compactness of UHPC reaches the maximum, and the compressive strength and chloride ion permeability of UHPC still maintain a good level. The negative impact of UHPC on the ecological environment gradually decreases with the increase of steel slag powder replacement amount.
    王思雨,曾敏,胡方杰,等.利用鋼渣粉制備生態型超高性能混凝土的研究[J].混凝土與水泥制品,2022(2):87-91. WANG S Y,ZENG M,HU F J,et al.Study on Preparation of Ecological Ultra-high Performance Concrete with Steel Slag Powder[J].China Concrete and Cement Products,2022(2):87-91.
    抗裂劑與冷卻水管協同控制金雞湖隧道側墻結構開裂應用研究
    抗裂劑與冷卻水管協同控制金雞湖隧道側墻結構開裂應用研究
    • 林立文1,王晨光1,康 健1,張 堅2,3,徐 文2,3,王育江2,3,賀 飛4,鄭 彬5
    2022年第2期
    摘要
    引用本文
    摘 ? 要:為了抑制金雞湖隧道主體結構厚度為1.4 m側墻的早期收縮裂縫,在優選原材料與配合比設計的基礎上,提出了采用抗裂劑與冷卻水管控溫協同控制的方法來降低混凝土開裂風險,并通過理論評估與工程應用分析了該方法的可行性。結果表明:夏季高溫施工時,通過使用抗裂劑與合理預埋、操作冷卻水管來調控結構溫升和變形,可將收縮開裂風險系數基本控制在0.7以下,實體結構監測結果也表明該方法切實有效。研究成果可為不具備嚴格控溫條件的類似現澆隧道混凝土結構的開裂預防設計提供參考。 Abstract: In order to inhibit early-age shrinkage cracks of the sidewall with a thickness of 1.4 m in main structure of Jinji Lake Tunnel, based on the optimization of raw materials and mix proportion design, a cooperative control method of anti-cracking agent and cooling water pipe was proposed to reduce the concrete cracking risk, and the feasibility of this method was analyzed through theoretical evaluation and engineering application. The results show that the shrinkage cracking risk coefficient can be basically controlled below 0.7 by using anti-cracking agent and reasonably embedding and operating cooling water pipe to control the temperature rise and deformation of the structure during high temperature construction in summer. The monitoring results of actual structure also show that this method is effective. The research results can provide a reference for the crack prevention design of similar cast-in-place tunnel concrete structures without strict temperature control conditions.
    林立文,王晨光,康健,等.抗裂劑與冷卻水管協同控制金雞湖隧道側墻結構開裂應用研究[J].混凝土與水泥制品,2022(2):82-86. LIN L W,WANG C G,KANG J,et al.Study on the Effect of Anti-cracking Agent and Cooling Water Pipe on the Cracking of Sidewall Structure of Jinji Lake Tunnel[J].China Concrete and Cement Products,2022(2):82-86.
    大跨度混凝土結構井字梁設計方法
    大跨度混凝土結構井字梁設計方法
    • 白煥一
    2022年第2期
    摘要
    引用本文
    摘 ? 要:通過對平面軸線尺寸為25.2 m×33.6 m大跨度樓蓋的結構分析,探討了大跨度混凝土結構的設計方法,提出了鋼筋混凝土井字梁式樓蓋結構的設計方案,可為類似大跨度樓蓋結構的設計提供參考。 Abstract: Through the structural analysis of the long-span floor with a plane axis size of 25.2 m × 33.6 m, the design method of the long-span concrete structure is discussed, and the design scheme of the reinforced concrete well-shaped beam-type floor structure is put forward, which can provide a reference for the design of similar long-span floor structures.
    白煥一.大跨度混凝土結構井字梁設計方法[J].混凝土與水泥制品,2022(2):76-81. BAI H Y.Design Method of Well-shaped Beam of Long-span Concrete Structures[J].China Concrete and Cement Products,2022(2):76-81.
    ALC墻板在裝配式混凝土建筑中應用的關鍵技術研究
    ALC墻板在裝配式混凝土建筑中應用的關鍵技術研究
    • 牛昌林1,馮力強2,吳星蓉1,周 磊1,魏宏亮1
    2022年第2期
    摘要
    引用本文
    摘 ? 要:以圍護體系ALC墻板在裝配式混凝土建筑領域中應用的關鍵技術為研究重點,對ALC墻板的性能特點、設計原理、連接構造進行了分析,并對ALC墻板在寒冷地區的應用提出了建議。 Abstract: Focusing on the key technology of the application of the envelope system ALC wallboard in the field of prefabricated concrete buildings, the performance characteristics, design principles and connection structures of the ALC wallboard are analyzed, and some suggestions on the application of ALC wallboard in cold regions are put forward.
    牛昌林,馮力強,吳星蓉,等.ALC墻板在裝配式混凝土建筑中應用的關鍵技術研究[J].混凝土與水泥制品,2022(2):73-75. NIU C L,FENG L Q,WU X R,et al.Study on Key Technology of ALC Wallboard in Prefabricated Concrete Buildings[J].China Concrete and Cement Products,2022(2):73-75.
    EPS輕混凝土干燥收縮性能試驗研究
    EPS輕混凝土干燥收縮性能試驗研究
    • 郭向勇,李偉龍,王建軍
    2022年第2期
    摘要
    引用本文
    摘 ? 要:通過試驗研究了陶粒、PP纖維、膨脹劑、膠凝材料用量以及環境條件對EPS輕混凝土干燥收縮性能的影響,探討了不同密度等級EPS輕混凝土干燥收縮性能的變化規律。結果表明:EPS輕混凝土的收縮值在90 d內增長較快,180 d后收縮值增速減??;EPS輕混凝土的收縮值隨著膠凝材料摻量的增加而增大;摻加膨脹劑、PP纖維以及采用覆膜養護能降低EPS輕混凝土的收縮值,摻入適量陶粒能有效降低EPS輕混凝土的收縮值;低溫環境會使EPS輕混凝土的收縮值顯著增大;EPS輕混凝土的干燥收縮性能與EPS輕混凝土的組分和各組分材料配比密切相關;采用對數型收縮值計算模型可對EPS輕混凝土的收縮值進行預測。 Abstract: The effects of ceramsite, polypropylene fiber, expansive agent, cementitious materials content and environmental conditions on the drying shrinkage performance of EPS lightweight concrete were studied, and the variation laws of drying shrinkage performance of EPS lightweight concrete with different density grades were studied. The results show that the shrinkage value of EPS lightweight concrete increases rapidly within 90 days, and the growth rate of shrinkage value decreases after 180 days. The shrinkage value of EPS lightweight concrete increases with the increase of cementitious materials content. The shrinkage value of EPS lightweight concrete can be reduced by adding expansive agent, polypropylene fiber and film curing. Adding appropriate amount of ceramsite can effectively reduce the shrinkage value of EPS lightweight concrete. Low temperature environment will significantly increase the shrinkage value of EPS lightweight concrete. The drying shrinkage performance of EPS lightweight concrete is closely related to the components of EPS lightweight concrete and the material ratio of each component. The shrinkage value of EPS lightweight concrete can be predicted by using the logarithmic shrinkage value calculation model.
    郭向勇,李偉龍,王建軍.EPS輕混凝土干燥收縮性能試驗研究[J].混凝土與水泥制品,2022(2):68-72. GUO X Y,LI W L,WANG J J.Experimental Study on Drying Shrinkage of EPS Lightweight Concrete[J].China Concrete and Cement Products,2022(2):68-72.
    密拼式鋼筋桁架混凝土疊合板力學性能及最大裂縫寬度研究
    密拼式鋼筋桁架混凝土疊合板力學性能及最大裂縫寬度研究
    • 王麗倩1,楊 杰1,金 星2,張耀庭1
    2022年第2期
    摘要
    引用本文
    摘 ? 要:由于密拼式鋼筋桁架混凝土疊合板天然存在50~60 mm深度的拼縫,故有必要對其最大裂縫寬度問題進行深入研究。為此,設計制作了3塊密拼式疊合板、1塊后澆帶式疊合板和1塊整澆預制板,對其進行了靜載試驗。試驗及數值模擬結果表明,通過公式?滓s≤0.6fyk限制開裂截面處受拉鋼筋的鋼筋應力能較好地保證密拼拼縫鋼筋桁架疊合板在正常使用過程中的最大裂縫寬度的控制問題。 Abstract: It is necessary to study the maximum crack width of reinforced truss concrete composite slab because of its natural seam of 50~60 mm depth. For this reason, three close assembled composite slabs, one post-cast strip composite slab and one precast slab were designed and manufactured, and the static load tests were carried out. The test and numerical simulation results show that limiting the tensile stress of steel bar at cracked section by the formula ?滓s≤0.6fyk can ensure the control of maximum crack width of reinforced truss concrete composite slab with close stitching joints in normal operation.
    王麗倩,楊杰,金星,等.密拼式鋼筋桁架混凝土疊合板力學性能及最大裂縫寬度研究[J].混凝土與水泥制品,2022(2):61-67. WANG L Q,YANG J,JIN X,et al.Study on the Mechanical Properties and Maximum Crack Width of the Reinforced Truss Concrete Composite Slabs[J].China Concrete and Cement Products,2022(2):61-67.
    玄武巖纖維增強全再生粗骨料混凝土力學性能試驗研究
    玄武巖纖維增強全再生粗骨料混凝土力學性能試驗研究
    • 許安邦1,蘇煒煒2,梁宇涵2,陳宗平2,3
    2022年第2期
    摘要
    引用本文
    摘 ? 要:研究了玄武巖纖維摻量對全再生粗骨料混凝土抗壓和抗折強度、破壞形態、單軸受壓應力-應變曲線的影響。結果表明:摻入玄武巖纖維后,試件的抗壓強度提高,受壓破壞時的整體性更好;隨著玄武巖纖維摻量的增加,試件的抗折強度逐漸增大,所有抗折試件均為峰值后脆性破壞;隨著玄武巖纖維摻量的增加,試件的峰值應力先增大后減小,峰值應變、靜壓彈性模量和軸壓韌性比總體均呈增大趨勢。 Abstract: The effects of basalt fiber content on the compressive and flexural strength, failure mode and uniaxial stress-strain curve of fully recycled coarse aggregate concrete were studied. The results show that after adding basalt fiber, the compressive strength of the specimen is improved and the integrity of compression failure is better. With the increase of basalt fiber content, the flexural strength of the specimens increases gradually, and all flexural specimens are brittle failure after peak value. With the increase of basalt fiber content, the peak stress increases first and then decreases, and the peak strain, static elastic modulus and axial compressive toughness ratio increase as a whole.
    許安邦,蘇煒煒,梁宇涵,等.玄武巖纖維增強全再生粗骨料混凝土力學性能試驗研究[J].混凝土與水泥制品,2022(2):56-60. XU A B,SU W W,LIANG Y H,et al.Experimental Study on Mechanical Properties of Basalt Fiber Reinforced Fully Recycled Coarse Aggregate Concrete[J].China Concrete and Cement Products,2022(2):56-60.
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