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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

    混凝土早強劑低溫性能試驗研究
    混凝土早強劑低溫性能試驗研究
    • 張 豐,白 銀,陳 波,寧逢偉,呂樂樂,胡海明
    2021年第7期
    摘要
    引用本文
    摘 ? 要:從強度、凝結時間、水化熱及混凝土工作性、耐久性等方面比較了5種混凝土早強劑在低溫環境下的性能差異,綜合評價了市售混凝土早強劑的低溫使用效果。結果表明:5 ℃養護下,早強劑使砂漿7 d強度均有一定程度提高,但1 d強度仍比較低,且會使28 d強度倒縮;早強劑的摻入可促進低溫下水泥的水化,使水化誘導期縮短,最大放熱速率、放熱量增大;摻D、E早強劑對混凝土工作性影響不大,滿足實際工程施工性能的要求,可一定程度提高混凝土早期強度,但低溫早強效果仍有限,且會導致混凝土后期性能下降。 Abstract: The performance differences of five kinds of commercial concrete early-strength agents at low temperature were compared from the perspectives of compressive strength, setting time, hydration heat, and workability and durability of concrete, and the application effect of the early-strength agents currently on the market was evaluated. The results show that under 5 ℃ curing, the early-strength agent can increase the strength of the mortar to a certain extent, but the strength of 1 d is still relatively low, and it will shrink the strength of 28 d. The incorporation of the early-strength agent can promote the hydration of cement at low temperature, shorten the hydration induction period, and increase the maximum heat release rate and heat release. Adding D and E early-strength agents has little effect on the workability of concrete, which meets the requirements of actual engineering construction performance and can increase the early strength of concrete to a certain extent. However, the effect of low-temperature early-strength is still limited, and adding early-strength agents will cause the later performance of concrete to decline.
    張豐,白銀,陳波,等.混凝土早強劑低溫性能試驗研究[J].混凝土與水泥制品,2021(7):1-6. ZHANG F,BAI Y,CHEN B,et al.Study on the Propery of Early-strength Agent of Concrete at Low Temperature[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(7):1-6.
    堿激發膠凝材料的研究現狀
    堿激發膠凝材料的研究現狀
    • 丁 銳,何 月,李星辰
    2021年第7期
    摘要
    引用本文
    摘 ? 要:對堿激發膠凝材料在制備工藝、膠凝組分、激發方式以及應用方面進行了綜述,論述了堿激發膠凝材料作為綠色土木工程材料、快速修復和處理有毒、放射性廢棄物等方面的最新應用進展,分析了堿激發膠凝材料所面臨的挑戰,并對堿激發膠凝材料的研究前景進行了展望。 Abstract: The preparation process, bonding components, excitation methods and applications of alkali-activated gelling materials are summaried. The latest application progress of alkali-activated cementitious materials as green civil engineering materials, rapid repair and treatment of toxic and radioactive wastes is discussed. The challenges faced by alkali-activated cementitious materials are analyzed, and the developing trend of alkali-activated cementitious materials is prospected.
    丁銳,何月,李星辰.堿激發膠凝材料的研究現狀[J].混凝土與水泥制品,2021(7):7-11. DING R,HE Y,LI X C.Research Status of Alkali-activated Cementitious Materials[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(7):7-11.
    碳納米管水泥砂漿壓阻效應預測
    碳納米管水泥砂漿壓阻效應預測
    • 王燕鋒1,2, 趙曉華1,邊亞東2,趙 毅2,王愛勤3
    2021年第7期
    摘要
    引用本文
    摘 ? 要:為了深入探討碳納米管水泥砂漿的電導特性,在細觀力學的基礎上提出了預測碳納米管水泥基復合材料壓阻效應的數學模型。該模型基于Mori-Tanaka方法,考慮碳納米管之間的隧穿電導,可求出碳納米管復合水泥基體的有效電導;此外,還考慮了應變作用下孔隙水離子電導隨空隙連通性變化對碳納米管水泥基復合材料壓阻效應的影響,根據試驗結果擬合出相關預測參數。結果表明:考慮離子電導的影響,根據提出的預測模型求出的壓阻效應預測值與試驗結果符合較好。 Abstract: In order to study the electrical conductivity of multi-walled carbon nanotubes (MWCNTs) reinforced cement-based materials, a mathematical model for predicting the piezoresistive effect of MWCNTs reinforced cement-based materials was proposed on the basis of micromechanics. Based on Mori Tanaka method and considering the tunneling conductivity between carbon nanotubes, the effective conductivity of MWCNTs reinforced cement matrix could be calculated. In addition, the influence of ionic conductivity of pore water on piezoresistive effect of MWCNTs reinforced cement-based materials under strain was also considered. According to the test results, the relevant prediction formula was fitted. The results show that considering the influence of ionic conductivity, the prediction results of piezoresistive effect given by the prediction model are in good agreement with the experimental results.
    王燕鋒,趙曉華,邊亞東,等.碳納米管水泥砂漿壓阻效應預測[J].混凝土與水泥制品,2021(7):12-16. WANG Y,ZHAO X H,BIAN Y D,et al.Prediction of Piezoresistive Effect of Carbon Nanotube Reinforced Cement Mortar[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(7):12-16.
    清水混凝土外觀氣泡穩定控制方法及其工程 應用
    清水混凝土外觀氣泡穩定控制方法及其工程 應用
    • 韓向朝1,潘 毅1,柳現杰1,張 旋2,3,張 健2,3,錢春香2,3
    2021年第7期
    摘要
    引用本文
    摘 ? 要:為解決清水混凝土外觀氣泡控制問題,基于實驗室試驗確定了外觀氣泡穩定控制的高魯棒性材料參數區間,并提出了清水混凝土外觀氣泡的定量評價指標和方法。工程實踐表明,外觀氣泡控制的材料參數區間對于不同施工參數具有良好的抗干擾能力,可實現外觀氣泡的穩定控制。 Abstract: In order to solve the problem of appearance pore control of fair-faced concrete, a material parameter robust interval for stable control of appearance pores was determined based on experiments in laboratory, and a quantitative evaluation index and method for appearance pores of fair-faced concrete was proposed. Engineering practice shows that, the material parameter interval of appearance pores has good anti-interference ability for different construction parameters, and can achieve stable control of appearance pores.
    韓向朝,潘毅,柳現杰,等.清水混凝土外觀氣泡穩定控制方法及其工程應用[J].混凝土與水泥制品,2021(7):17-20,25. HAN X C,PAN Y,LIU X J,et al.Stable Control Method for Appearance Pores of Fair-faced Concrete and Its Engineering Application[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(7):17-20,25.
    水灰比和硫酸鈉濃度對水泥基材料劣化過程的影響
    水灰比和硫酸鈉濃度對水泥基材料劣化過程的影響
    • 王金川1,陳 登2
    2021年第7期
    摘要
    引用本文
    摘 ? 要:對浸泡在0.44%和5.00%硫酸鈉溶液中水灰比為0.24、0.28和0.32的硬化水泥漿體不同齡期下的膨脹率、質量損失和抗壓抗蝕系數等性能進行了研究,并采用差熱分析儀(DSC)、X射線衍射儀(XRD)和掃描電鏡(SEM)對侵蝕產物物相和微結構進行了分析。結果表明:水泥漿體出現由邊角向內部逐層侵蝕,導致水泥試件膨脹、開裂和剝落;增加水灰比和環境中硫酸根離子濃度都會加速侵蝕破壞;在高濃度侵蝕環境下,劣化過程包含慢速破壞階段和快速破壞階段,石膏的大量形成是引起試件快速破壞的主要原因。 Abstract: The expansion, mass loss and compressive corrosion resistance coefficient of hardened cement pastes, with water cement ratio of 0.24, 0.28 and 0.32, soaked in 0.44% and 5.00% sodium sulfate solutions, were studied at different ages. The phases and microstructure of attacked specimens were analyzed by differential scanning calorimeter (DSC), X-Ray diffractometer(XRD) and scanning electron microscope(SEM). The results show that the cement paste specimens are attacked layer by layer from the corner to the inside, causing the expansion, cracking and spalling. The increase of water cement ratio and sulfate ion concentration in the environment can all accelerate the erosion damage. In the environment of high sulfate concentration, the deterioration process includes slow and fast failure stages, and the formation of a large number of gypsum is the main reason for the rapid failure of specimens.
    王金川,陳登.水灰比和硫酸鈉濃度對水泥基材料劣化過程的影響[J].混凝土與水泥制品,2021(7):21-25. WANG J C,CHEN D.Influence of W/C and Sulfate Concentration on Deterioration Process of Cement Based Material[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(7):21-25.
    再生骨料透水混凝土的研究進展
    再生骨料透水混凝土的研究進展
    • 肖力光,孟祥博
    2021年第7期
    摘要
    引用本文
    摘 ? 要:介紹了建筑廢棄物混凝土破碎所得的再生骨料替代天然骨料的透水混凝土,總結了孔隙率、再生骨料級配和取代率、骨料包裹強化處理、外加劑、細菌強化等因素對再生骨料透水混凝土性能的影響,綜述了再生骨料透水混凝土的研究和應用現狀,并對其未來的研究重點與方向作出了展望。 Abstract: The construction waste pervious concrete by crushing the recycled aggregate instead of natural aggregate was introduced. The porosity, recycled aggregate gradation and aggregate package strengthening processing, admixture , bacteria strengthening methods on the performance were summarized. The research and application status of recycled aggregate pervious concrete were reviewed, and the future research focus and direction of recycled aggregate pervious concrete were prospected.
    肖力光,孟祥博.再生骨料透水混凝土的研究進展[J].混凝土與水泥制品,2021(7):26-29,37. XIAO L G,MENG X B.Research Progress of Recycled Aggregate Pervious Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(7):26-29.
    靜養時間對蒸養機制砂混凝土抗壓強度和耐久性的影響
    靜養時間對蒸養機制砂混凝土抗壓強度和耐久性的影響
    • 貢鑫茹1,耿 健2,3,李玲玉1
    2021年第7期
    摘要
    引用本文
    摘 ? 要:研究了靜養時間對蒸養機制砂混凝土抗壓強度和耐久性的影響。結果表明:延長靜養時間,可以增大蒸養機制砂混凝土的抗壓強度,有利于耐久性能的提升;靜養時間過長,蒸養機制砂混凝土抗壓強度的增長幅度不大。 Abstract: ?The influence of the static curing time on the compressive strength and durability of steam curing machine-made sand concrete was studied. The results show that the compressive strength of steam curing machine-made sand concrete can be increased, and its durability can be improved by prolonging the static curing time. However, the compressive strength of steam curing machine-made sand concrete will not increase significantly if the static curing time is too long.
    貢鑫茹,耿健,李玲玉.靜養時間對蒸養機制砂混凝土抗壓強度和耐久性的影響[J].混凝土與水泥制品,2021(7):30-32. GONG X R,GENG J,LI L Y.Effect of Static Curing Time on the Compressive Strength and Durability of Steam Curing Machine-made Sand Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(7):30-32.
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