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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

    海洋侵蝕環境下超高性能混凝土的力學與耐久性能研究
    海洋侵蝕環境下超高性能混凝土的力學與耐久性能研究
    • 張志豪1,2,陳露一1,2,黃有強1,2,蓋珂瑜1
    2022年第7期
    摘要
    引用本文
    摘 ? 要:通過加速劣化試驗方法研究了超高性能混凝土(UHPC)在模擬海洋侵蝕環境下的力學和耐久性能。結果表明:海水養護下UHPC的力學性能受開始浸泡時間的影響較小,長期力學性能發展比較穩定;UHPC具有良好的適應性和耐久性能,凍融循環對UHPC性能的影響相對較大,但介質類型對其性能的影響較??;隨著硫酸鹽干濕循環次數的增加,UHPC的相對動彈性模量和抗壓強度耐蝕系數先增加后降低,質量損失增加;硫酸鹽干濕循環會導致UHPC表面露出的鋼纖維銹蝕,但內部結構無損傷,鋼纖維與基體結合緊密。 Abstract: The mechanical properties and durability of ultra-high performance concrete(UHPC) under marine environment were investigated by accelerated deterioration test. The results show that the mechanical properties of UHPC under seawater curing are less affected by the initial immersion time, and the long-term mechanical properties are relatively stable. UHPC has good adaptability and durability. Freeze-thaw cycles have a relatively large effect on UHPC performance, but media type has less effect on UHPC performance. With the increase of the number of dry and wet cycles of sulfate, the relative dynamic elastic modulus and compressive strength corrosion resistance coefficient of UHPC first increase and then decrease, and the mass loss increases. The dry and wet cycles of sulfate lead to steel fiber corrosion on the surface, but the internal structure is not damaged, and the steel fiber is closely combined with the matrix.
    張志豪,陳露一,黃有強,等.海洋侵蝕環境下超高性能混凝土的力學與耐久性能研究[J].混凝土與水泥制品,2022(7):1-4,9. ZHANG Z H,CHEN L Y,HUANG Y Q,et al.Study on Mechanical Proporties and Durability of Ultra-high Performance Concrete Under Marine Erosion Environment[J].China Concrete and Cement Products,2022(7):1-4,9.
    石墨改性EPS顆粒對超輕泡沫混凝土性能的影響
    石墨改性EPS顆粒對超輕泡沫混凝土性能的影響
    • 康升榮,程寶軍,麻鵬飛,史博元
    2022年第7期
    摘要
    引用本文
    摘 ? 要:采用普通硅酸鹽水泥、氣凝膠粉、石墨改性EPS顆粒、發泡劑等制備了干密度約為120 kg/m3的石墨改性EPS顆粒超輕泡沫混凝土,研究了石墨改性EPS顆粒對其密度、力學性能、吸水率、導熱系數和孔結構的影響。結果表明:當石墨改性EPS顆粒摻量為30%時,超輕泡沫混凝土的各項性能最優,抗壓強度為0.25 MPa,吸水率為10.3%,導熱系數為0.032 6 W/(m·K);隨著石墨改性EPS顆粒摻量的增加,損泡率明顯增大,孔徑分布和孔結構參數發生明顯改變。 Abstract: The foam concrete with a dry density of 120 kg/m3 was prepared by ordinary portland cement, aerogel powder, graphite modified EPS particles, foaming agent and additive. The effects of graphite modified EPS particles content on the density, mechanical properties, water absorption, thermal conductivity, and pore structure of foam concrete were studied. The results show that when graphite modified EPS particles with the content of 30% are added, the foam concrete has the best properties, the compressive strength is 0.25 MPa, the water absorption is 10.3%, and the thermal conductivity is 0.032 6 W/(m·K). With the increase of the content of graphite modified EPS particles, the bubble loss rates increase obviously, and the pore size distribution and pore structure parameters change obviously.
    康升榮,程寶軍,麻鵬飛,等.石墨改性EPS顆粒對超輕泡沫混凝土性能的影響[J].混凝土與水泥制品,2022(7):5-9. KANG S R,CHENG B J,MA P F,et al.Influence of Graphite Modified EPS Particles on the Performance of Ultra-light Foam Concrete[J].China Concrete and Cement Products,2022(7):5-9.
    超緩釋降黏型外加劑在泵送頂升自密實混凝土中的應用
    超緩釋降黏型外加劑在泵送頂升自密實混凝土中的應用
    • 李繼存1,趙少鵬2,3,陸加越2,3,楊曉奇2,3
    2022年第7期
    摘要
    引用本文
    李繼存,趙少鵬,陸加越,等.超緩釋降黏型外加劑在泵送頂升自密實混凝土中的應用[J].混凝土與水泥制品,2022(7):10-13,19. LI J C,ZHAO S P, LU J Y,et al.Application of Super Slow-release Viscosity-reducing Admixture in Pumping-up Self-compacting Concrete[J].China Concrete and Cement Products,2022(7):10-13,19.
    膠砂比對UHPC高溫力學性能及微觀結構的影響
    膠砂比對UHPC高溫力學性能及微觀結構的影響
    • 王 宏1,2,王丹丹3,朱 平1,2,何長龍1,2,王桂敏1,2,蓋梅香1,2,孫曉光1,2
    2022年第7期
    摘要
    引用本文
    摘 ? 要:利用鐵尾礦砂制備了超高性能混凝土(UHPC),研究了在高溫環境下不同膠砂比(1∶0.8、1∶0.9、1:1.0、1∶1.1)對UHPC試件力學性能的影響,測定了高溫下UHPC的孔結構,并用SEM表征了UHPC的微觀結構,探討了膠砂比對UHPC高溫性能影響的機理。結果表明,隨著溫度的不斷升高,不同膠砂比的UHPC力學性能出現了不同程度的下降,其中,膠砂比為1∶1.0的UHPC在各個目標溫度下均表現出相對較高的力學性能;微觀分析表明膠砂比為1∶1.0的UHPC基體比膠砂比為1∶0.8的UHPC基體更加密實,在高溫作用下裂縫寬度更小,且基體與鋼纖維的結合能力更強,有效降低了鋼纖維在高溫下的破壞程度。 Abstract: Ultra-high performance concrete(UHPC) was prepared by iron tailings sand. The effect of different binder-sand ratio(1∶0.8, 1∶0.9, 1∶1.0, 1∶1.1) on the mechanical properties of UHPC at high temperature was studied. The pore structure of UHPC at high temperature was determined. The microstructure of UHPC was charactered by SEM, and the mechanism of the effect of binder-sand ratio on the high temperature properties of UHPC was discussed. The results show that with the increase of temperature, the mechanical properties of UHPC with different binder-sand ratio decrease in varying degrees, and the UHPC with 1∶1.0 binder-sand ratio shows relatively high mechanical properties at each target temperature. Pore structure and SEM analysis show that UHPC matrix with 1∶1.0 binder-sand ratio is denser than UHPC matrix with 1∶0.8 binder-sand ratio, and crack width is smaller under high temperature. In addition, UHPC matrix with 1∶1.0 binder-sand ratio has stronger bonding ability with steel fiber, which effectively reduces the damage degree of steel fiber at high temperature.
    王宏,王丹丹,朱平,等.膠砂比對UHPC高溫力學性能及微觀結構的影響[J].混凝土與水泥制品,2022(7):14-19. WANG H,WANG D D,ZHU P,et al.Effect of Binder-sand Ratio on High-temperature Mechanical Properties and Microstructure of UHPC[J].China Concrete and Cement Products,2022(7):14-19.
    納米材料修復混凝土道面微裂縫的研究
    納米材料修復混凝土道面微裂縫的研究
    • 王后裕1,方新宇1,劉海濤2,曹海琳2,任韋波1,呂曉聰3,江志華4,馬 騰4
    2022年第7期
    摘要
    引用本文
    摘 ? 要:為了修復機場混凝土道面微裂縫,采用液相溶膠-凝膠法合成了一種硅聚集體納米修復材料,并研究了該納米修復材料對道面混凝土抗壓、抗折、防水、抗滲、抗氯離子滲透、抗凍、耐磨等性能的改善效果,探討了其修復機理。結果表明:經納米材料修復后,含微裂縫混凝土的抗壓強度提高了1.1倍,抗折強度提高了90%,抗滲性能提高了1.6倍,抗氯離子滲透性能提高了60%,抗凍性能提高了70%,耐磨性能提高了65%,防水性能有顯著改善,摩擦系數變化不大。 Abstract: To repair the micro-cracks in the concrete pavement of the airport, a silicon aggregate nano-repair material was synthesized by liquid sol-gel method. The improvement effects of nano-repair material on the properties of pavement concrete such as compressive strength, flexural strength, waterproofing, impermeability, chloride ion penetration resistance, freeze-thaw resistance and wear resistance were studied, and its repair mechanism was discussed. The results show that the compressive strength, flexural strength, impermeability, chloride ion penetration, freeze-thaw resistance and wear resistance ?of concrete with micro-cracks are increased by 1.1 times, 90%, 1.6 times, 60%, 70% and 65%, respectively. The waterproof performance is significantly improved, and the surface friction coefficient has not changed much.
    王后裕,方新宇,劉海濤,等.納米材料修復混凝土道面微裂縫的研究[J].混凝土與水泥制品,2022(7):20-24. WANG H Y,FANG X Y,LIU H T,et al.Study on Micro-cracks Repairing of Concrete Pavement with Nano-repair Materials[J].China Concrete and Cement Products,2022(7):20-24.
    混凝土彈塑性單軸受壓分形損傷本構關系研究
    混凝土彈塑性單軸受壓分形損傷本構關系研究
    • 謝 明1,汪 鵬1,鄭山鎖2,劉佳豪1,王 梓1,周靜靜1
    2022年第7期
    摘要
    引用本文
    摘 ? 要:考慮混凝土單軸受壓破壞機理,在混凝土靜力損傷基礎上引入彈簧-摩擦塊模型,以模擬混凝土彈塑性階段的細觀結構變化?;诩氂^模型中彈簧、摩擦塊對混凝土斷裂面的影響,分析了混凝土受壓損傷的破壞規律,建立了不同強度等級混凝土彈塑性單軸受壓損傷本構模型,采用混凝土分形曲面模擬方法對所建模型進行了驗證。結果表明:所建立的模型能夠較好描述混凝土的塑性變形,對混凝土彈塑性的離散范圍具有良好的預測能力。 Abstract: Considering the failure mechanism of concrete under uniaxial compression, on the basis of concrete static damage, a spring-friction block model was introduced to simulate the meso-structural changes of concrete in the elastic-plastic stage. Based on the influence of the spring and friction block on the fracture surface of concrete in the mesoscopic model, the failure law of concrete compressive damage was analyzed, and the elastic-plastic uniaxial compressive damage constitutive model of concrete with different strength grades was established. The model was verified by the concrete fractal surface simulation method. The results show that the established model can describe the impact of concrete plastic deformation well, and has a good ability to predict the elastoplastic dispersion range of concrete.
    謝明,汪鵬,鄭山鎖,等.混凝土彈塑性單軸受壓分形損傷本構關系研究[J].混凝土與水泥制品,2022(7):25-29,39. XIE M,WANG P,ZHENG S S,et al.Fractal Damage Constitutive Relation of Concrete Elastoplastic Uniaxial Compression[J].China Concrete and Cement Products,2022(7):25-29,39.
    HCSA抗裂增強混凝土的應用研究
    HCSA抗裂增強混凝土的應用研究
    • 劉 立1,趙宇洋2,徐 寧1,季彩云1
    2022年第7期
    摘要
    引用本文
    摘 ? 要:研究了HCSA抗裂增強材料對混凝土強度、限制膨脹率、溫度應力的影響,并分析了蒸養與非蒸養條件下摻抗裂增強材料混凝土的強度發展變化情況。結果表明:抗裂增強材料可顯著提高混凝土的抗裂性,當水膠比為0.36、抗裂增強材料摻量為70 kg/m3時,混凝土強度發展良好,且限制膨脹率較高;抗裂增強材料可顯著降低混凝土的溫度敏感性,當抗裂增強材料摻量為50 kg/m3時,混凝土試件最大壓應力提高了119%,斷裂應力下降了13%,斷裂溫度降低了37%;采用抗裂增強材料代替粉煤灰,在免蒸養條件下,混凝土1 d強度比提高了192%,在蒸養條件下,1 d強度比提高了196%。 Abstract: The effects of HCSA anti-cracking reinforcement materials on the strength, limiting expansion rate and temperature stress of concrete were investigated. The strength development of concrete under steam curing and non-steam curing after adding anti-cracking reinforcement materials were analyzed. The results show that the ?HCSA anti-cracking reinforcement material can significantly improve the crack resistance of concrete. When the W/B is 0.36 and the content of the anti-cracking reinforcement material is 70 kg/m3, the concrete strength developed well, and the limiting expansion rate is high. The anti-cracking reinforcement material can significantly reduce the temperature sensitivity of concrete. When the anti-cracking reinforcement material is added at 50 kg/m3, the maximum compressive stress of concrete specimens is increased by 119%, the fracture stress is reduced by 13% and the fracture temperature is reduced by 37%. When fly ash is instead by anti-cracking reinforcement material, the 1 d strength ratio of concrete increases by 192% under the non-steam curing conditions, the 1 d intensity ratio increases by 196% under the steam curing conditions.
    劉立,趙宇洋,徐寧,等.HCSA抗裂增強混凝土的應用研究[J].混凝土與水泥制品,2022(7):30-34,39. LIU L, ZHAO Y Y,XU N,et al.Application Study of HCSA Anti-cracking Reinforcement Materials in Concrete[J].China Concrete and Cement Products,2022(7):30-34,39.
    硫酸鹽漬土地區粉煤灰混凝土抗壓強度研究
    硫酸鹽漬土地區粉煤灰混凝土抗壓強度研究
    • 郭佳慶1,2,馬艷霞1,2,聶思凡1,2,魯生斌1,2,白繼雄3
    2022年第7期
    摘要
    引用本文
    摘 ? 要:為了探究硫酸鹽漬土地區粉煤灰混凝土抗壓強度隨侵蝕時間的變化規律,在某典型硫酸鹽漬土地區埋置不同粉煤灰摻量(0、10%、15%、20%)的混凝土試件進行了硫酸鹽侵蝕后的抗壓強度試驗和微觀形貌分析,并基于BP神經網絡模型預測了試件的抗壓強度。試驗結果表明:不同粉煤灰摻量試件的抗壓強度均隨著侵蝕時間的增加先升高后降低;當粉煤灰摻量為10%時,試件的抗壓強度最高。SEM分析表明:540 d時大部分試件出現了微裂縫,840 d時試件均發生了劣化,但尚未破壞;當粉煤灰摻量為10%時,試件的劣化不明顯;預測結果表明,侵蝕時間是影響摻粉煤灰混凝土試件抗壓強度的最主要因素。 Abstract: In order to explore the change rules of the compressive strength of fly ash concrete with erosion time in the sulfate-saline soil area, concrete specimens with different fly ash content(0, 10%, 15%, 20%) were embedded in a typical sulfate-saline soil area, and the compressive strength test and microscopic morphology analysis after sulfate erosion were carried out. The compressive strength of the specimen was predicted based on the BP neural network model. The test results show that the compressive strength of fly ash concrete with different fly ash content increases first and then decreases with the increase of erosion time. At different erosion time nodes, when the fly ash content is 10%, the compressive strength of the specimen is the highest. The SEM results show that at 540 d, most of the specimens appear micro-cracks. At 840 d, all the specimens are deteriorated, but not damaged. When the fly ash content is 10%, the deterioration of the specimens is not obvious. The prediction results show that erosion time is the main factor affecting the service performance of fly ash concrete.
    郭佳慶,馬艷霞,聶思凡,等.硫酸鹽漬土地區粉煤灰混凝土抗壓強度研究[J].混凝土與水泥制品,2022(7):35-39. GUO Jia-qing1,2, MA Yan-xia1,2, NIE Si-fan,et al.Research on the Compressive Strength of Fly Ash Concrete in the Sulfate-saline Soil Area[J].China Concrete and Cement Products,2022(7):35-39.
    透水混凝土的細觀孔隙結構分析
    透水混凝土的細觀孔隙結構分析
    • 劉冠志1,侯澤彪1,廖 霖1,呂永斌2,李子東2,王永明2
    2022年第7期
    摘要
    引用本文
    摘 ? 要:為了探究不同骨料粒徑及不同膠凝材料用量對透水混凝土內部孔隙結構的影響,采用CT掃描技術對不同骨料粒徑以及不同膠凝材料用量的試件進行了試驗,并使用重構軟件對掃描結果進行了二維及三維分析。結果表明:主要影響透水混凝土孔隙結構的因素是骨料粒徑和膠凝材料用量;孔隙結構可以看作由孔室和孔喉兩部分組成,骨料粒徑對孔室的影響較大,孔室的大小隨著骨料粒徑的增大逐漸向大孔室發展;孔喉面積主要受膠凝材料用量的影響;孔喉面積對透水混凝土的透水率有一定的影響。 Abstract: In order to explore the effects of different particle sizes of aggregates and different amounts of cementitious materials on the internal pore structure of permeable concrete, CT scanning technology was used to test specimens with different aggregate particle sizes and different amounts of cementitious materials, and reconstruction software was used. The scan results were analyzed in 2D and 3D. The results show that the factors affecting the pore structure of permeable concrete are the aggregate particle size and the amount of cementitious material. The pore structure can be regarded as consisting of two parts, the pore chamber and the pore throat, and the aggregate particle size has a great influence on the pore chamber. With the increase of aggregate particle size, the size of the pore chamber gradually develops into a large pore, and the pore throat area is mainly affected by the amount of cementitious material. Pore throat area has a certain influence on the permeability of pervious concrete.
    劉冠志,侯澤彪,廖霖,等.透水混凝土的細觀孔隙結構分析[J].混凝土與水泥制品,2022(7):40-44. LIU G Z,HOU Z B,LIAO L,et al.Analysis of Microscopic Pore Structure of Pervious Concrete[J].China Concrete and Cement Products,2022(7):40-44.
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