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    蘇州混凝土水泥制品研究院有限公司

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    混凝土研究

    天然和人工骨料水工混凝土的配制及性能研究
    天然和人工骨料水工混凝土的配制及性能研究
    • 張桂華1,張 豐2
    2022年第5期
    摘要
    引用本文
    摘 ? 要:分別選擇天然砂礫石、花崗巖人工骨料開展了C30、C20水工混凝土配合比設計及性能試驗,研究了骨料品種對相同強度等級混凝土拌和物性能、力學性能、絕熱溫升、耐久性能等方面的影響。結果表明:采用天然骨料或人工骨料,以絕對體積法設計、制備的C20W6F300、C30W6F350混凝土的強度、抗滲等級、抗凍等級均能滿足設計指標要求;當強度等級相同時,兩種骨料制備的混凝土拌和物性能相近,人工骨料混凝土的力學性能、抗裂性、抗凍性均優于天然骨料混凝土,但天然骨料混凝土的滲水高度小于人工骨料混凝土,C20人工骨料混凝土的絕熱溫升值略高于天然骨料混凝土,但兩者的平均溫升值相近。 Abstract: Natural sand gravel and granite artificial aggregates were selected respectively to carry out C30 and C20 hydraulic concrete mix proportion and performance tests, and the influences of aggregate variety on the mixture properties, mechanical properties, adiabatic temperature rise and durability performance of concrete of the same strength grade were studied. The results show that C20W6F300 and C30W6F350 concrete designed and prepared by the absolute volume method using natural aggregates or artificial aggregates can meet the requirements of design technical indicators in terms of strength, impermeability and frost resistance. The properties of the concrete mixture prepared from the 2 aggregates are similar. The mechanical properties and frost resistance of the artificial aggregate concrete are better than those of the natural aggregate concrete, but the water seepage height of the natural aggregate concrete is smaller than that of the artificial aggregate concrete, and the adiabatic temperature rise of artificial aggregate C20 concrete is slightly higher than that of natural aggregate C20 concrete, but the average temperature rise of the two is similar.
    張桂華,張豐.天然和人工骨料水工混凝土的配制及性能研究[J].混凝土與水泥制品,2022(5):1 -6,11. ZHANG G H,ZHANG F.Study on Preparation and Properties of Hydraulic Concrete with Natural and Artificial Aggregate[J].China Concrete and Cement Products,2022(5):1 -6,11.
    大溫差鹽漬土環境下礦物摻合料混凝土抗裂性能研究
    大溫差鹽漬土環境下礦物摻合料混凝土抗裂性能研究
    • 盧 燕1,夏 星1,井維東2,王 錕1
    2022年第5期
    摘要
    引用本文
    摘 ? 要:制備了基準組及三組不同摻量的粉煤灰-礦粉混凝土,采用環境試驗箱模擬大溫差及鹽漬土侵蝕環境,研究了混凝土的力學性能和抗裂性能。結果表明:礦物摻合料的摻入降低了混凝土的力學性能,但提高了其力學性能增長速率,還提高了混凝土的抗裂性能;摻15%粉煤灰和20%礦粉的混凝土前期抗壓強度增長速率較快,3~14 d的抗壓強度平均增長率比基準混凝土高102.46%,28 d的斷裂能比普通混凝土高50.67%;含礦物摻合料的混凝土抗折強度增長速率均高于基準混凝土;通過SEM發現,適量礦物摻合料改善了混凝土內部的密實度和孔隙結構,裂縫寬度明顯減小。 Abstract: The reference concrete and three kinds of fly ash-slag concrete with different contents were prepared, and their mechanical properties and crack resistance were studied by using an environmental test chamber to simulate the environment of large temperature difference and saline soil erosion. The results show that the addition of mineral admixtures reduces the mechanical properties of concrete, but increases its growth rate and also improves the crack resistance of concrete. The compressive strength growth rate of concrete mixed with 15% fly ash and 20% slag is faster in the early stage. The average growth rate of compressive strength from 3 d to 14 d is 102.46% higher than that of reference concrete, and the fracture energy of 28 d is 50.67% higher than that of reference concrete. The flexural strength growth rate of the three groups of mineral admixture concrete is generally higher than that of reference concrete. It is found by SEM that the appropriate mineral admixture improves the compactness and pore structure inside the concrete, the crack width is significantly reduced.
    盧燕,夏星,井維東,等.大溫差鹽漬土環境下礦物摻合料混凝土抗裂性能研究[J].混凝土與水泥制品,2022(5):7-11. LU Y,XIA X,JING W D,et al.Research on Crack Resistance of Mineral Admixture Concrete Under Large Temperature Difference and Saline Soil Environment[J].China Concrete and Cement Products,2022(5):7-11.
    摻合料復摻對清水混凝土性能的影響
    摻合料復摻對清水混凝土性能的影響
    • 蓋珂瑜1,2,龍 勇1,2,劉俊利1,2,陳露一1,2,李 信1,2,黃有強1,2
    2022年第5期
    摘要
    引用本文
    摘 ? 要:研究了一種黏度改性材料或石灰石粉與礦粉復摻對清水混凝土力學性能、抗滲性能和外觀質量的影響。結果表明:用8%的黏度改性材料或15%的石灰石粉與礦粉復摻對提高清水混凝土的抗壓強度、降低其電通量和氯離子擴散系數的效果相對較好;復摻黏度改性材料或石灰石粉制備的清水混凝土外觀顏色偏亮,表面平整光滑,氣泡較少。 Abstract: The effects of dosage of viscosity-modified material and limestone powder on mechanical properties, impermeability and appearance of fair-faced concrete with mineral powder were studied. The results show that 8% of viscosity modifier or 15% of limestone powder and mineral powder have relatively good effects on improving the compressive strength of fair-faced concrete and reducing its electric flux and chloride ion diffusion coefficient. The fair-faced concrete prepared by adding viscosity modified material or limestone powder has a brighter appearance, smooth surface and less air bubbles.
    蓋珂瑜,龍勇,劉俊利,等.摻合料復摻對清水混凝土性能的影響[J].混凝土與水泥制品,2022(5):12-16. GE K Y,LONG Y,LIU J L,et al.Effects of Admixtures on the Properties of Fair-faced Concrete[J].China Concrete and Cement Products,2022(5):12-16.
    晶核型早強劑在低溫條件下的水化促進作用
    晶核型早強劑在低溫條件下的水化促進作用
    • 馮燕芳1,王偉山2,3,鄭柏存1
    2022年第5期
    摘要
    引用本文
    摘 ? 要:研究了三種低溫(-3 ℃、0 ℃和5 ℃)環境下晶核型早強劑對水泥凝結硬化行為的影響,采用TG、XRD、SEM進行了表征,并對其機理進行了分析。結果表明,在低溫條件下,晶核型早強劑可以加快水泥水化進程,提高硬化漿體的致密程度,有效縮短水泥凝結時間并提升其早期強度的發展。 Abstract: The influence of crystal nucleus based accelerator on setting and hardening behaviors of cement in three low temperature environments(-3 ℃, 0 ℃ and 5 ℃) was investigated, the mechanism was characterized and analyzed by TG, XRD, SEM. The results show that the hydration process of cement can be accelerated by crystal nucleus based accelerator, densification of hardened paste is improved, the setting time of cement is effectively shorten and its early strength development is enhanced.
    馮燕芳,王偉山,鄭柏存.晶核型早強劑在低溫條件下的水化促進作用[J].混凝土與水泥制品,2022(5):17-20,25. FENG Y F,WANG W S,ZHENG B C.Hydration Process on Crystal Nucleus Based Accelerator Under Low Temperature Environments[J].China Concrete and Cement Products,2022(5):17-20,25.
    機制砂成分對隧道混凝土抗硫酸鹽侵蝕性能的影響
    機制砂成分對隧道混凝土抗硫酸鹽侵蝕性能的影響
    • 何 柳
    2022年第5期
    摘要
    引用本文
    摘 ? 要:基于機制砂混凝土在隧道工程服役過程中出現的侵蝕破壞現象,采用相同的原材料、配合比進行混凝土加速侵蝕試驗,研究了機制砂成分對隧道混凝土抗硫酸鹽侵蝕性能的影響。結果表明,含有石膏礦物相且石粉含量較多的機制砂制備出的砂漿試件,在低溫環境下發生了硫酸鹽侵蝕破壞。因此,在低溫環境下使用機制砂作為隧道混凝土細骨料時,必須檢驗并控制其成分,防止其對混凝土的耐久性帶來不利影響。 Abstract: Based on the erosion and damage phenomenon of machine-made sand concrete in the service process of tunnel engineering, the accelerated erosion test of concrete was carried out with the same raw materials and mix proportion, and the influence of the compositions of machine-made sand on the sulfate corrosion resistance of tunnel concrete was studied. The results show that the mortar specimens prepared from machine-made sand containing gypsum mineral phase and high content of stone powder suffer sulfate erosion damage at low ambient temperature. Therefore, when machine-made sand is used as tunnel concrete fine aggregate in a low temperature environment, its composition must be inspected and controlled to prevent it from adversely affecting the durability of concrete.
    何柳.機制砂成分對隧道混凝土抗硫酸鹽侵蝕性能的影響[J].混凝土與水泥制品,2022(5):21-25. HE L.Effect of the Compositions of Machine-made Sand on the Sulfate Resistance of the Tunnel Concrete[J].China Concrete and Cement Products,2022(5):21-25.
    機制砂超高性能混凝土(UHPC)試驗研究
    機制砂超高性能混凝土(UHPC)試驗研究
    • 王全超1,2,周玉娟3,占 文1,2,秦明強1,2,楊 林1,2,黃玉良3
    2022年第5期
    摘要
    引用本文
    摘 ? 要:為配制經濟型超高性能混凝土(UHPC),在標準養護制度下,采用機制砂取代石英砂,研究了機制砂細度及其級配對UHPC性能的影響,并結合掃描電子顯微鏡(SEM)分析其高強機理。結果表明:采用合理級配機制砂可顯著提高UHPC試件的工作性及力學性能,并可制備出擴展度為680 mm,28 d最大抗折、抗壓強度分別為25.8 MPa、135.6 MPa的機制砂UHPC;機制砂、鋼纖維與水泥石基體結合緊密,且鋼纖維在水泥石基體中均勻分布,使UHPC試件具有優異的力學性能。 Abstract: In order to prepare economical ultra-high performance concrete (UHPC), the quartz sand was replaced by mechanical sand. The influence of mechanical sand fineness and its gradation on the performance of UHPC was studied under standard curing. Additionally, the high strength mechanism was further clarified through SEM micro-morphology analysis. The results show that the working performance and mechanical properties of the UHPC samples can be significantly improved with reasonable gradation of mechanical sand. The UHPC samples with an expansion of 680 mm and the 28 d maximum flexural strength and compressive strength of 25.8 MPa and 135.6 MPa can be prepared by mixing mechanical sand. The reason is that mechanical sand and steel fibers are tightly combined with the cement paste matrix, and the steel fibers are uniformly distributed in the cement paste matrix. The uniform and dense structure makes the samples have excellent properties.
    王全超,周玉娟,占文,等.機制砂超高性能混凝土(UHPC)試驗研究[J].混凝土與水泥制品,2022(5):26-29,45. WANG Q C,ZHOU Y J,ZHAN W,et al.Study on Ultra-high Performance Concrete(UHPC) with Mechanism Sand[J].China Concrete and Cement Products,2022(5):26-29,45.
    不同因素對透水混凝土性能的影響
    不同因素對透水混凝土性能的影響
    • 周家慧,楊建永,李 鈞
    2022年第5期
    摘要
    引用本文
    摘 ? 要:基于正交試驗研究了粗骨料占比、漿膜厚度、水膠比及硅灰替代率四種因素對透水混凝土抗壓強度及透水系數的影響。結果表明:漿膜厚度對透水混凝土抗壓強度及透水系數的影響最大;隨著粗骨料占比的增加,透水混凝土的抗壓強度降低,透水系數先增后減;隨著漿膜厚度的增加,透水混凝土的抗壓強度增加,透水系數降低;隨著水膠比的增加,透水混凝土的抗壓強度先增后減,透水系數波動變化;隨著硅灰替代率的增加,透水混凝土的抗壓強度總體呈增大趨勢,透水系數降低;通過優選得到抗壓強度最優組的透水混凝土抗壓強度為35.1 MPa、透水系數為1.8 mm/s,可應用于輕型荷載道路;透水系數最優組的透水混凝土抗壓強度為26.7 MPa、透水系數為3.6 mm/s,可應用于人行道、非機動車道等。 Abstract: Through the orthogonal experiment design method, the influence of four factors, the proportion of coarse aggregate, the thickness of the grout, the water-binder ratio and the replacement rate of silica fume on the compressive strength and water permeability coefficient of pervious concrete was studied. The results show that the thickness of the grout has the greatest influence on the compressive strength and permeability coefficient of the pervious concrete. As the proportion of coarse aggregate increases, the compressive strength of pervious concrete decreases, and the permeability coefficient first increases and then decreases. As the thickness of the grout increases, the compressive strength of pervious concrete increases and the permeability coefficient decreases. As the water-binder ratio increases, the compressive strength of pervious concrete first increases and then decreases, and the permeable coefficient fluctuates. As the replacement rate of silica fume increases, the compressive strength of pervious concrete generally shows an increasing trend, while the permeable coefficient decreases. Through the test of the two optimal combinations, it is obtained that the compressive strength of the pervious concrete with the best compressive strength is 35.1 MPa and the water permeability coefficient is 1.8 mm/s, which can be applied to light-loaded roads. The compressive strength of the pervious concrete with the optimal combination of permeability coefficient is 26.7 MPa and the permeability coefficient is 3.6 mm/s, which can be applied to sidewalks, non-motorized roads, etc.
    周家慧,楊建永,李鈞.不同因素對透水混凝土性能的影響[J].混凝土與水泥制品,2022(5):30-35. ZHOU J H,YANG J Y,LI J.The Influence of Different Factors on the Performance of Pervious Concrete[J].China Concrete and Cement Products,2022(5):30-35.
    改性納米CaCO3對水泥基復合材料性能的 影響
    改性納米CaCO3對水泥基復合材料性能的 影響
    • 李倩茹,杜紅秀
    2022年第5期
    摘要
    引用本文
    摘 ? 要:采用乙烯醋酸乙烯酯可再分散乳膠粉(EVA)對納米CaCO3顆粒進行改性,并用吸光光度法分析其分散效果。摻入濃度為5%~20%的EVA溶液和1.0%~2.5%的納米CaCO3制備了水泥基復合材料試件(NCC),研究了改性納米CaCO3對NCC抗壓強度的影響,并用SEM對NCC微觀結構進行了表征。結果表明:EVA溶液對納米CaCO3具有良好的分散作用;納米CaCO3摻量相同時,EVA溶液濃度越大,減水劑摻量越少;當EVA水溶液的濃度為15%,納米CaCO3摻量為膠凝材料質量的2.0%時,NCC各齡期的抗壓強度最高,表面孔隙較少。 Abstract: The nano-CaCO3 powder was modified by ethylene-vinyl acetate redispersible latex powder (EVA), and its dispersion effect was analyzed by absorptiometry. The cement-based composite specimens(NCC) were prepared by adding EVA aqueous solution with a concentration of 5%~20% and 1.0%~2.5% nano-CaCO3, and the effect of modified nano-CaCO3 on the compressive strength of NCC was studied, and the microstructure of NCC was characterized by SEM. The results show that the EVA aqueous solution has a good dispersing effect on the nano-CaCO3. When the content of nano-CaCO3 is the same, the greater the concentration of EVA solution, the less the content of water reducing agent. When the concentration of EVA aqueous solution is 15%, and the content of nano-CaCO3 is 2.0% of the mass of the cementitious material, the compressive strength of NCC is higher than that of the control group, and the surface pores are less.
    李倩茹,杜紅秀.改性納米CaCO3對水泥基復合材料性能的影響[J].混凝土與水泥制品,2022(5):34-37. LI Q R,DU H X.Influence of Modified Nano-CaCO3 on the Properties of Cement-based Composites[J].China Concrete and Cement Products,2022(5):34-37.
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