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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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    第八期

    多元礦物摻合料對泡沫混凝土性能影響研究
    多元礦物摻合料對泡沫混凝土性能影響研究
    • 劉召超
    2021年第8期
    摘要
    引用本文
    摘 ? 要:為研究礦物摻合料對泡沫混凝土力學性能、導熱系數、抗凍性的影響,以粉煤灰摻量10%的泡沫混凝土為基準,通過分別單摻硅灰和礦粉及復摻硅灰、礦粉研究了礦物摻合料對泡沫混凝土性能的改善作用。結果表明:當分別單摻硅灰和礦粉時,泡沫混凝土的抗壓強度、抗折強度及抗凍性均得到一定提升,導熱系數隨之增大;當復摻硅灰和礦粉,且復摻比例為2∶1時,泡沫混凝土的強度和抗凍性最佳,導熱系數最大。 Abstract: To study the influence of mineral admixtures on the mechanical properties, thermal conductivity, and frost resistance of foamed concrete, based on the foamed concrete with a fly ash content of 10%, by mixing silica fume and mineral powder alone and compounding silica fume and mineral powder respectively, the improvement effect of mineral admixture on the foamed concrete was studied. The results show that when silica fume and mineral powder are added separately, the compressive strength, flexural strength and frost resistance of foamed concrete are improved to a certain extent, and the thermal conductivity increases accordingly. When silica fume and mineral powder are added, the compressive strength, flexural strength, and frost resistance of foamed concrete are increased. When the mixing ratio of silica fume and slag powder is 2∶1, the strength and frost resistance of the foamed concrete are the best, and the thermal conductivity is the largest.
    劉召超.多元礦物摻合料對泡沫混凝土性能影響研究[J].混凝土與水泥制品,2021(8):1-4. LIU Z C.Effect of Multi-mineral Admixtures on Properties of Foamed Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(8):1-4.
    碳納米管活性粉末混凝土力學性能試驗研究
    碳納米管活性粉末混凝土力學性能試驗研究
    • 劉桂鳳1,朱 鼎1,陳正發1,張華娣1,李 巖2
    2021年第8期
    摘要
    引用本文
    摘 ? 要:選擇三種養護方式(標準養護、80 ℃熱水養護、灑水養護)、設置5種碳納米管摻量(0、0.05%、0.10%、0.15%、0.20%),研究了碳納米管的分散性和摻量、養護方式對碳納米管活性粉末混凝土力學性能的影響,并基于SEM測試結果對基體進行了微觀分析。結果表明:經分散處理后的MWCNTs溶液的分散性和穩定性提高;相較于未分散處理的MWCNTs,MWCNTs分散液對活性粉末混凝土抗壓、抗折強度的提高幅度更大;80 ℃熱水養護下,當經分散處理后的MWCNTs摻量為0.10%時,MWCNTs活性粉末混凝土的抗壓和抗折強度最大;標準養護和灑水養護下,當經分散處理后的MWCNTs摻量為0.15%時,MWCNTs活性粉末混凝土的抗壓和抗折強度最大;SEM結果顯示,膠凝材料二次水化生成了大量水化硅酸鈣,減少了孔隙;碳納米管能與基體緊密連接,阻止微裂縫的生成和擴展,起到了橋接和填充作用。 Abstract: Three kinds of curing methods(standard curing, 80 ℃ hot water curing and sprinkling curing) were selected, 5 kinds of carbon nanotube(MWCNTs) content(0, 0.05%, 0.10%, 0.15%, 0.20%)were set, the influence of the dispersibility and dosage of MWCNTs and curing methods on the mechanical properties of carbon nanotube reactive powder concrete was studied. The microstructure of matrix was characterized by SEM. The results show that the dispersion and stability of the MWCNTs solution after dispersion treatment are improved. Compared with the undispersed MWCNTs, the MWCNTs dispersion has a greater improvement in the compressive and flexural strength of reactive powder concrete. Under 80 ℃ hot water curing, when the content of dispersed MWCNTs is 0.10%, the compressive and flexural strength of MWCNTs reactive powder concrete reach the maximum. Under standard curing and sprinkling curtain curing, when the content of dispersed MWCNTs is 0.15%, the compressive and flexural strength of MWCNTs reactive powder concrete reach the maximum. SEM results show that the secondary hydration of the cementitious material produces a large amount of hydrated calcium silicate, which reduces porosity. MWCNTs can be closely connected with the matrix, preventing the formation and expansion of micro-cracks, and playing the role of bridging and filling. ?
    劉桂鳳,朱鼎,陳正發,等.碳納米管活性粉末混凝土力學性能試驗研究[J].混凝土與水泥制品,2021(8):5-9. LIU G F,ZHU D,CHEN Z F,et al.Experimental Study on Mechanical Properties of Carbon Nanotube Reactive Powder Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(8):5-9.
    膨脹劑和高吸水樹脂對低水灰比GRC性能的影響
    膨脹劑和高吸水樹脂對低水灰比GRC性能的影響
    • 安雪瑋,鄒聞達,汪金能
    2021年第8期
    摘要
    引用本文
    摘 ? 要:對比研究了不同摻量的高吸水樹脂(SAP)與鈣質膨脹劑(UEA)復合作用對低水灰比玻璃纖維增強水泥基材料(GRC)力學性能、收縮性能和抗裂性能的影響,并對抑制收縮機理進行了討論。結果表明:預吸水的SAP釋水具有內養護的效果,能夠促進水泥水化;摻入0.2%的SAP能夠提高水泥砂漿的力學性能,但是SAP含量進一步增加時,釋水留下的孔隙會導致力學性能降低;SAP釋放的水分能夠補償混凝土的內部濕度,從而降低毛細管張力,同時釋放的水分能夠提供給UEA進行膨脹反應,從而協同抑制水泥砂漿的收縮,細化裂縫,降低開裂指數,提高抗裂性能。 Abstract: The influence of super absorbent polymer(SAP) and calcium expansion agent (UEA) on mechanical properties, shrinkage properties and crack resistance of glass fiber reinforced cement(GRC) with low W/C was analyzed, and the mechanism of inhibiting shrinkage was also discussed. The results show that the pre-absorbed SAP release water has the effect of internal curing and can promote the hydration of cement. The addition of 0.2% SAP can improve the mechanical properties of cement mortar. However, when the SAP content increases continuously, the pores left by the release of water further will cause decrease in mechanical properties. The water released by SAP can compensate the internal humidity of the concrete, thereby reducing the capillary tension. On the other hand, the released water can be provided to UEA for expansion reaction, thereby synergistically inhibiting the shrinkage of cement mortar, thinning cracks, reducing the cracking index, and having a better cracking resistance.
    安雪瑋,鄒聞達,汪金能.膨脹劑和高吸水樹脂對低水灰比GRC性能的影響[J].混凝土與水泥制品,2021(8):10-13. AN X?W,ZOU W?D,WANG J?N.Influence of Expansive Agent and Super Absorbent Polymer on the Performance of GRC with Low Water-cement Ratio[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(8):10-13.
    黏度對HPMC透水混凝土性能及施工溫度的影響
    黏度對HPMC透水混凝土性能及施工溫度的影響
    • 高夢秋1,蘇 悅2,楊 航1
    2021年第8期
    摘要
    引用本文
    摘 ? 要:研究了羥丙基甲基纖維素(HPMC)溶液濃度與黏度的關系和HPMC溶液黏度與其透水混凝土性能的關系,得出了滿足力學性能及透水性能要求的HPMC透水混凝土施工溫度條件。結果表明:HPMC溶液黏度隨濃度增大而增加;HPMC透水混凝土的抗壓強度隨溶液黏度增加先增后減,在滿足抗壓強度要求的黏度區間內,其抗折強度及透水性均滿足要求;在一定條件下,HPMC黏度隨溫度升高而減小,對具有較高黏度的HPMC透水混凝土,可通過控制其拌合物的出機溫度以滿足和易性要求。 Abstract: The relationship between the concentration and viscosity of HPMC, viscosity of HPMC solution permeability of concrete was studied. The temperature condition of HPMC permeable concrete construction that meet the requirements of mechanical performance and water permeability was obtained. The results show that the viscosity of HPMC solution increases with the increase of concentration. The compressive strength of HPMC permeable concrete increases first and then decreases with the increase of solution viscosity. Within the viscosity range that meets the requirements of compressive strength, its flexural strength and water permeability meet the requirements. Within the certain conditions, the HPMC viscosity decreases with the increase of temperature. For HPMC permeable concrete with higher viscosity, the exit temperature of the mixture can be controlled to ensure that the construction operation and workability are satisfied.
    高夢秋,蘇悅,楊航.黏度對HPMC透水混凝土性能及施工溫度的影響[J].混凝土與水泥制品,2021(8):14-18. GAO M Q,SU Y,YANG H.The Effect of Viscosity on the Performance and Construction Temperature of HPMC Permeable Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(8):14-18.
    基于硫酸鹽侵蝕的混凝土干濕循環制度研究
    基于硫酸鹽侵蝕的混凝土干濕循環制度研究
    • 郭進軍1,王 錕1,陳坤鵬2,楊 林1,萬 聰1,李 昊1
    2021年第8期
    摘要
    引用本文
    摘 ? 要:設計了四種干濕比(1∶1、3∶1、5∶1、7∶1)和兩種干燥方式(烘箱干燥、自然干燥),通過相對抗壓強度和相對動彈性模量的變化研究了干濕循環下硫酸鹽侵蝕混凝土的力學性能劣化規律,并利用掃描電子顯微鏡、X射線衍射儀和壓汞儀探究了微觀結構的演變過程。結果表明:硫酸鹽侵蝕混凝土的力學性能呈現先增加后降低的趨勢;烘箱干燥和自然干燥下,混凝土劣化相對較嚴重的干濕比分別為3∶1和5∶1;混凝土孔隙總體積隨齡期的延長不斷降低,其中,有害孔(50 nm≤d≤200 nm)的減少是孔隙細化的最主要原因。 Abstract: Four dry-wet ratios (1∶1, 3∶1, 5∶1, 7∶1) and two drying methods(oven drying, natural drying)were designed. Base on the change rules of relative compressive strength and relative dynamic elasticity modulus, the degradation law of sulfate attacked concrete performance in alternating drying-wetting environments was studied, and the evolution of the microstructure was explored by scanning electron microscope, X-ray diffractometer and mercury porosimeter. The results show that the mechanical properties of sulfate attacked concrete show a trend of first increasing and then decreasing. Under oven-drying and air-drying, the dry-wet ratios for the relatively serious deterioration of concrete are 3∶1 and 5∶1 respectively. The total volume of concrete pores continues to decrease with erosion. The reduction of harmful pores(50 nm≤d≤200 nm) is the main reason for pore refinement.
    郭進軍,王錕,陳坤鵬,等.基于硫酸鹽侵蝕的混凝土干濕循環制度研究[J].混凝土與水泥制品,2021(8):19-23,27. GUO J J,WANG K,CHEN K P,et al.Research on Dry-wet Cycle System of Concrete Under Sulfate Attack[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(8):19-23,27.
    MgO膨脹劑在大體積混凝土結構中的抗裂效果研究
    MgO膨脹劑在大體積混凝土結構中的抗裂效果研究
    • 曹豐澤1,高玉亭2,張慧杰2,閻培渝1
    2021年第8期
    摘要
    引用本文
    摘 ? 要:研究了摻加MgO膨脹劑配制的補償收縮混凝土在具有高抗裂性要求的大體積混凝土側墻施工過程中的體積變形和溫度變化情況?,F場試驗結果表明:摻加6.2%M型MgO膨脹劑的C35補償收縮混凝土在滿足強度發展要求的前提下,可以在大體積混凝土結構內部溫度下降段產生一定的膨脹,并長期保持穩定,補償混凝土結構的溫度收縮,從而使結構內部產生少量的預壓應力,降低混凝土結構收縮裂縫的出現幾率。 Abstract: The temperature and volume variation of shrinkage-compensating concrete mixed with MgO expansive agent was measured during the construction of a mass concrete wall with high anti-cracking requirement. The results show that MgO expansive agent compensates the shrinkage of mass concrete effectively during the descending period of temperature. The ultimate volumetric expansive rate of concrete is positive, forming a compressive pre-stress to resist cracking of concrete effectively.
    曹豐澤,高玉亭,張慧杰,等.MgO膨脹劑在大體積混凝土結構中的抗裂效果研究[J].混凝土與水泥制品,2021(8):24-27. CAO F?Z,GAO Y?T,ZHANG H?J,et al.Study on the Anti-cracking Efficiency of MgO Expansive Agent on?Shrinkage-compensating Concrete in Mass Concrete Wall Structure[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(8):24-27.
    無堿液體速凝劑的制備及其性能研究
    無堿液體速凝劑的制備及其性能研究
    • 周紅燕,張 耀
    2021年第8期
    摘要
    引用本文
    摘 ? 要:以硫酸鋁和三乙醇胺作為速凝劑的主體組分,摻入甘油 、氟化鈉、改性乙二醇、草酸、無機酸5種調節組分配制了無堿速凝劑,確定了硫酸鋁、三乙醇胺、草酸、甘油、改性乙二醇、無機酸的合理摻量。結果表明:采用制備的速凝劑可使試件的初凝時間小于5 min,終凝時間小于12 min,1 d抗壓強度達到7.5 MPa,7 d抗壓強度達到34.2 MPa,穩定性滿足現行標準的要求。 Abstract: A alkali-free accelerator was prepared by using aluminum sulfate and triethanolamine as the main components and adding glycerin, sodium fluoride, modified ethylene glycol, oxalic acid and inorganic acid. The reasonable dosage of aluminum sulfate, triethanolamine, oxalic acid, glycerin, modified ethylene glycol and inorganic acid was determined. The results show that the specimen with prepared accelerator has an initial setting time of less than 5 min and a final setting time of less than 12 min. The 1 d compressive strength of the specimen reaches 7.5 MPa, and the 7 d compressive strength reaches 34.2 MPa, and its stability meets the requirements of current standards.
    周紅燕,張耀.無堿液體速凝劑的制備及其性能研究[J].混凝土與水泥制品,2021(8):28-31,36. ZHOU H Y,ZHANG Y.Study on the Preparation and Performance of Alkali-free Liquid Accelerator[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(8):28-31,36.
    人工魚礁用混凝土研究與應用現狀
    人工魚礁用混凝土研究與應用現狀
    • 馮業城1,李思琪1,孫 勇1,張 鵬2,楊進波1
    2021年第8期
    摘要
    引用本文
    摘 ? 要:綜述了人工魚礁用混凝土的研究與應用現狀,介紹了人工魚礁用混凝土目前所采用的主要原材料,分析了人工魚礁用混凝土的力學性能、抗氯離子滲透性能、抗硫酸鹽侵蝕性能、生物附著性能、環境安全性能、抗生物硫酸腐蝕性能和工作性及其測試方法,并對人工魚礁用混凝土的發展方向提出了建議。 Abstract: ?The research and application of concrete for artificial reef are reviewed. The main raw materials of artificial reef concrete are introduced. The mechanical properties, chloride penetration resistance, sulfate erosion resistance, biological growth adhesion, environmental safety, biological sulfuric acid corrosion resistance and working performance of concrete for artificial reef and their test methods are analyzed. According to the present situation, some suggestions for the future development of artificial reef concrete materials are put forward.
    馮業城,李思琪,孫勇,等.人工魚礁用混凝土研究與應用現狀[J].混凝土與水泥制品,2021(8):32-36. FENG Y C,LI S Q,SUN Y,et al.Research and Application Status of Concrete for Artificial Reef[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(8):32-36.
    立體脈動式預制混凝土板柔性生產線的研發與應用
    立體脈動式預制混凝土板柔性生產線的研發與應用
    • 劉加華1,紀先鋒2
    2021年第8期
    摘要
    引用本文
    摘 ? 要:針對目前國內預制混凝土板自動化流水生產線存在的問題(主輔工位數量不匹配、設備瓶頸多、養護效率低、設備利用率低、難以實現柔性生產等),研發了脈動式預制混凝土板柔性生產線。實際生產表明,采用該生產線,預制混凝土板的生產效率比傳統流水生產線提高了3倍以上。同時,該生產線具有生產成本低、土地利用率高、設備坪效比高等優勢,可進一步推廣應用。 Abstract: Aiming at the problems existing in the automatic flow production line for precast concrete slab(the number mismatch between main operation stations and auxiliary stations, many equipment bottlenecks, low standard maintenance efficiency, low utilization rate of equipment, and difficulty in flexible production), a three-dimensional pulsating flexible production line for precast concrete slab was developed. The actual production shows that the production efficiency of precast concrete slab with the flexiable production line can be increased by more than 3 times compared with that of the traditional production line. At the same time, it has the advantages of low production cost, high land utilization rate and high equipment ground effect ratio, which can be further promoted and applied.
    劉加華,紀先鋒.立體脈動式預制混凝土板柔性生產線的研發與應用[J].混凝土與水泥制品,2021(8):37-40. LIU J H,JI X F.Development and Application of Flexible Production Line for Three-dimensional Pulsating Precast Concrete Slab[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(8):37-40.
    石粉對預制沉管機制砂混凝土性能的影響研究
    石粉對預制沉管機制砂混凝土性能的影響研究
    • 徐 延,劉 行,李 超,胡文剛
    2021年第8期
    摘要
    引用本文
    摘 ? 要:研究了石粉含量對預制沉管機制砂混凝土工作性、力學性能等的影響。結果表明:石粉含量過大會導致混凝土拌和物含氣量下降、黏聚性提高、流動性降低;石粉在混凝土中主要起填充作用,當石粉含量在10%左右時,混凝土的力學性能和抗氯離子滲透性較好;石粉含量過大會導致混凝土塑性開裂敏感性提高,但在合適養護條件下,機制砂可提高混凝土的抗裂性能;混凝土的干燥收縮率隨石粉含量和齡期增加而上升,石粉含量為10%時,混凝土的60 d干燥收縮率為311×10-6;石粉對引氣高性能混凝土抗凍性的影響不顯著,但隨石粉含量增加而下降。 Abstract: The effect of stone powder on the workability and mechanical properties of precast immersed tube manufactured-sand concrete was studied. The results show that stone powder reduces the entrained air content of concrete, increases cohesiveness and reduces fluidity. Stone powder primarily plays a role of micro-aggregate filling. When the stone powder content is about 10%, the mechanical performance and the resistance to chloride ion diffusion are the best. Stone powder enhances the plastic cracking sensitivity of concrete, but the manufactured sand is beneficial to advance the crack resistance of concrete under good curing. The drying shrinkage rate of concrete rises with stone powder content increasing. When the stone powder content is 10%, the 60 d drying shrinkage rate is 311×10-6. The influence of stone powder on the frost resistance of air-entrained high performance concrete is not significant, but it appears to decrease with the increase of stone powder content.
    徐延,劉行,李超,等.石粉對預制沉管機制砂混凝土性能的影響研究[J].混凝土與水泥制品,2021(8):41-44. XU Y,LIU H,LI C,et al.Influence of Stone Powder on the Performance of Sand Concrete for Precast Immersed Tube Manufactured[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(8):41-44.
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