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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

    水泥基自密實修復砂漿的制備及性能研究
    水泥基自密實修復砂漿的制備及性能研究
    • 郭 超1,李秋義2,岳公冰2
    2022年第6期
    摘要
    引用本文
    摘 ? 要:為充分發揮無機修復材料在混凝土結構損傷中的應用,研究了骨料種類及粒徑、減水劑摻量、膠砂比、膠粉摻量、聚丙烯(PP)纖維摻量、消泡劑摻量對自密實快速修復砂漿工作性及力學性能的影響。結果表明:石英砂砂漿比河砂砂漿有更高的抗壓強度,但韌性較差;綜合考慮性能及經濟性,減水劑摻量為1.6%較為適宜;隨著膠砂比降低,砂漿的力學性能下降;摻入2.5%膠粉的砂漿比空白組流動度提高了3.1%,抗折強度提高了8.5%,但過量的膠粉對砂漿性能產生消極影響;PP纖維對砂漿的工作性無明顯影響,但隨著其摻量增加,砂漿的抗壓強度下降;消泡劑的摻入減小了砂漿的流動度,但摻量超過0.1%后幾乎不再變化,而砂漿的力學性能隨著其摻量的增加先上升后下降。 Abstract: To enhance the application of inorganic repair materials in the damage of concrete structures, the effects of sand type and particle size, superplasticizer dosage, binder sand ratio, latex powder and PP fiber, defoamer dosage on the basic performance of self-compacting rapid repair mortar were studied. The results show that the mortar made of quartz sand has higher compressive strength but lower toughness compared with river sand. From the performance and economy point of view, 1.6% dosage of superplasticizer is more suitable. The mechanical properties of the mortar decrease with the decrease of the binder sand ratio. 2.5% latex powder can improve 3.1% fluidity and 8.5% flexural strength of mortar, but too much latex powder will have a negative impact on the properties. PP fiber has no obvious effect on the workability of mortar, but with the increase of its content, the compressive strength shows a downward trend. The addition of defoamer reduces the fluidity of mortar, but it almost does not change when the content exceeds 0.1%. The mechanical strength first increases and then decreases with the increase of defoamer dosage.
    郭超,李秋義,岳公冰.水泥基自密實修復砂漿的制備及性能研究[J].混凝土與水泥制品,2022(6):1-5. GUO C,LI Q Y,YUE G B.Research on Preparation and Properties of Cement-based Self-compacting Repair Mortar[J].China Concrete and Cement Products,2022(6):1-5.
    減縮劑對超高性能混凝土性能的影響研究
    減縮劑對超高性能混凝土性能的影響研究
    • 劉菲凡
    2022年第6期
    摘要
    引用本文
    摘 ? 要:研究了減縮劑(SRA)摻量對超高性能混凝土(UHPC)抗壓強度、抗折強度、自收縮和干燥收縮的影響。結果表明:隨著減縮劑摻量的增加,UHPC的自收縮和干燥收縮顯著降低,特別是早期自收縮減小效果更為明顯,但同時會降低試件的抗壓強度、抗折強度,且隨著減縮劑摻量的增加,抗壓強度不斷降低。 Abstract: The effects of shrinkage reducing agent(SRA) dosage on compressive strength, flexural strength, self-shrinkage and drying shrinkage of UHPC were studied. The results show that with the increase of SRA, the self-shrinkage and drying shrinkage of UHPC are significantly reduced, especially for the early self-shrinkage reduction effect is more obvious, but at the same time the compressive strength and the flexural strength of the UHPC specimen are reduced, and with the increase of SRA, the compressive strength is continuously reduced.
    劉菲凡.減縮劑對超高性能混凝土性能的影響研究[J].混凝土與水泥制品,2022(6):6-9,16. LIU F F.Effect of Shrinkage Reducing Admixture on the Properties of UHPC[J].China Concrete and Cement Products,2022(6):6-9,16.
    微膠囊對水泥基復合材料自修復性能的影響綜述
    微膠囊對水泥基復合材料自修復性能的影響綜述
    • 徐天辰1,宋玉峰2,歐陽利軍1,楊澤沛1,王凱星1,秦亞洲1,楊桄勝1
    2022年第6期
    摘要
    引用本文
    摘 ? 要:綜述了摻微膠囊的水泥基復合材料自修復性能的研究成果,包括微膠囊的制備方法、微膠囊的自身性質、微膠囊對水泥基復合材料性能的影響、微膠囊修復水泥基復合材料的機理和修復效果,對比討論了相關文獻的試驗結果,并展望了水泥基復合材料自修復性能研究的發展方向。 Abstract: The research results of self-healing properties of microcapsule cement-based composites are reviewed, including the preparation method of microcapsules, the properties of microcapsules, the effect of microcapsules on the properties of cement-based composites materials, mechanism and effect of microcapsules repairing cement-based composites materials. The experimental results of relevant literatures are compared and analyzed. In addition, the future research trend of self-healing properties of cement-based composites is summarized and discussed.
    徐天辰,宋玉峰,歐陽利軍,等.微膠囊對水泥基復合材料自修復性能的影響綜述[J].混凝土與水泥制品,2022(6):10-16. XU T C,SONG Y F,OUYANG L J,et al.A Review of the Effect of Microcapsules on Self-healing Properties of Cement-based Composites[J].China Concrete and Cement Products,2022(6):10-16.
    混凝土裂縫快速修補膠漿的制備及性能研究
    混凝土裂縫快速修補膠漿的制備及性能研究
    • 姜克錦1,陳輝強2,尹 強1,熊 亮2,郭儀南1,姚曉康1
    2022年第6期
    摘要
    引用本文
    摘 ? 要:以超細硅酸鹽水泥和超細硫鋁酸鹽水泥為基準材料,以苯丙乳液和納米SiO2為改性劑制備了一種混凝土橋梁底板裂縫快速修補膠漿,通過研究改性劑摻量對修補膠漿流動度和凝結時間的影響,確定了其最佳配合比,研究了苯丙乳液摻量對修補膠漿拉伸性能和強度的影響。結果表明:修補膠漿的最佳配合比為:m(超細水泥)∶m(水)∶m(納米SiO2)∶ m(苯丙乳液)=100∶60∶2∶9;在此配合比下,該修補膠漿的初凝時間為56 min,終凝時間為64 min,初始流動度和 30 min 流動度分別為 250 mm和65 mm, 28 d抗壓強度和抗折強度分別為19.4 MPa和6.1 MPa,折壓比為31.4%,與裂縫壁的黏結強度為2.57 MPa;該修補膠漿施工性能、強度和韌性優良,與裂縫壁黏結性能良好,可確保裂縫修補后的使用耐久性。 Abstract: With ultrafine portland cement and ultrafine sulphoaluminate cement as the base materials, with styrene-acrylic emulsion and nano-SiO2 as modifiers, a kind of quick repair mortar for concrete bridge base crack was prepared. The optimal mix property of modifier was determined by studying the influence of modifier content on the fluidity and setting time of repair mortar. The effect of the content of styrene-acrylic emulsion on the tensile properties and strength of the repair mortar was systematically studied. The results show that the optimal mix proportion of repair mortar is: m(ultra-fine cement)∶m(water)∶m(nano-SiO2)∶m(styrene-acrylic emulsion)=100∶60∶2∶9. Under the optimal proportion, the initial setting time of the repair mortar is about 56 min, and the final setting time is 64 min, the initial fluidity and the fluidity after 30 minutes are 250 mm and 65 mm. The 28 d compressive strength and flexural strength are 19.4 MPa and 6.1 MPa respectively, and the flexural ratio is 31.4%, and the bond strength to the crack wall is 2.57 MPa. The repair mortar has excellent construction performance, strength and toughness, and has good bonding performance with the crack wall, which can ensure the durability after the crack is repaired.
    姜克錦,陳輝強,尹強,等.混凝土裂縫快速修補膠漿的制備及性能研究[J].混凝土與水泥制品,2022(6):17-20,26. JIANG K J,CHEN H Q,YIN Q,et al.Study on Preparation and Properties of Quick Repair Mortar for Concrete Crack[J].China Concrete and Cement Products,2022(6):17-20,26.
    單側壓對凍融混凝土劈拉損傷特性的影響
    單側壓對凍融混凝土劈拉損傷特性的影響
    • 李文博a,b,王乾峰a,b,彭 剛a,b,趙 茗a,b,程卓群a,b
    2022年第6期
    摘要
    引用本文
    摘 ? 要:對凍融混凝土進行了不同單側壓下的劈拉試驗,分析了凍融循環次數和單側壓對混凝土劈拉性能的影響,并結合聲發射技術研究了混凝土在劈拉過程中的損傷發展,建立了混凝土損傷演化方程。結果表明:隨著凍融循環次數的增加,混凝土凍融劣化程度加深,峰值應力明顯降低;相同凍融循環次數下,單側壓越大,混凝土的峰值應力越大;經歷凍融循環后的混凝土損傷發展速度加快,單側壓的存在對混凝土的損傷發展起到延阻作用;考慮凍融循環次數和單側壓作用的混凝土劈拉損傷演化曲線均可分為損傷初始發展階段、損傷穩定發展階段和損傷快速發展階段。 Abstract: The split tensile test of freeze-thaw concrete under different unilateral compression was carried out. The influence of the number of freeze-thaw cycles and unilateral compression on the split tensile performance of concrete was analyzed, and the damage of concrete during the split tensile process was studied by acoustic emission technology. The concrete damage evolution formula was established. The results show that as the number of freeze-thaw cycles increases, the degree of freeze-thaw degradation of concrete deepens, and the peak stress decreases significantly. Under the same number of freeze-thaw cycles, the greater the unilateral pressure, the greater the peak stress of concrete. The development speed of concrete damage after the freeze-thaw cycles is accelerated, and the existence of unilateral pressure has an effect of extending resistance on concrete damage. The split tensile damage evolution curve of concrete considering the number of freeze-thaw cycles and unilateral pressure can be divided into initial damage development stage, stable damage development stage, and rapid damage development stage.
    李文博,王乾峰,彭剛,等.單側壓對凍融混凝土劈拉損傷特性的影響[J].混凝土與水泥制品,2022(6):21-26. LI W B,WANG Q F,PENG G,et al.Influence of Unilateral Pressure on the Split Tensile Damage Characteristics of Freeze-thaw Deteriorated Concrete[J].China Concrete and Cement Products,2022(6):21-26.
    基于Drucker-Prager準則的再生混凝土破壞研究
    基于Drucker-Prager準則的再生混凝土破壞研究
    • 趙江濤
    2022年第6期
    摘要
    引用本文
    基于Drucker-Prager準則對C30、C40再生混凝土動、靜態荷載作用下的破壞機理與破壞形式進行了分析。結果表明:在靜態荷載作用下,再生混凝土的破壞過程可分為四個階段,主要表現為由脆性破壞向塑性破壞的轉變;動態荷載對再生混凝土的動態抗壓強度具有增強效應;在動態荷載作用下,再生混凝土主要表現為粉碎破壞,并隨著沖擊氣壓的增加,粉碎程度提高,再生混凝土的應力-應變曲線均呈先上升后下降的趨勢,且上升段的斜率隨沖擊氣壓的增加而增大,而下降段的斜率相似,總體呈現從應變硬化發展為應變軟化的現象。 Based on the Drucker-Prager criterion, the failure mechanism and failure form of C30 and C40 recycled concrete under dynamic and static loads were analyzed. The results show that under static loads, The failure process of recycled concrete can be divided into four stages, mainly manifested as the transition from brittle failure to plastic failure. Dynamic load has an enhancement effect on the dynamic compressive strength of recycled concrete. Under the action of dynamic load, the main performance of recycled concrete is crushing failure, and the crushing degree increases with the increase of impact air pressure. The stress-strain curves of recycled concrete all show a trend of rising first and then falling, and the slope of the ascending section increases with the increase of the impact air pressure, while the slope of the descending section is similar, and the phenomenon of developing from strain hardening to strain softening is generally exhibited.
    趙江濤.基于Drucker-Prager準則的再生混凝土破壞研究[J].混凝土與水泥制品,2022(6):27-30,36. ZHAO J T.Study on Failure of Recycled Concrete Based on Drucker-Prager Criterion[J].China Concrete and Cement Products,2022(6):27-30,36.
    超輕質混凝土的抗凍性試驗方法研究
    超輕質混凝土的抗凍性試驗方法研究
    • 劉 迪,王 玲,王振地,方 俊
    2022年第6期
    摘要
    引用本文
    針對現有方法評價超輕質混凝土的抗凍性存在烘干開裂、凍融失效過快等不足,提出了一種改進測試方法,即試件飽水后再瀝水,以調節含水率,并采用氣凍氣融進行凍融循環試驗。研究了瀝水時間、融化溫度和試件尺寸對超輕質混凝土強度損失率和質量損失率的影響。結果表明:控制瀝水時間能有效調節試件的含水率;隨著瀝水時間的延長,試件的凍融質量損失率和強度損失率大體呈下降趨勢;降低凍融循環試驗時的融化溫度能有效解決試件的開裂問題;尺寸較小試件對溫度的敏感程度相對較大,尺寸較大的試件凍融破壞嚴重,不易搬運。并在此研究基礎上,提出了適合超輕質混凝土抗凍性試驗的改進方法,確定了適宜的瀝水時間、融化溫度和試件尺寸,分別為6 h、15 ℃和100 mm×100 mm×100 mm,可為超輕質混凝土的抗凍性測試提供參考。 Aimed to solve the deficiencies of the domestic existing msethod for evaluating the freeze-thaw resistance of ultra-lightweight concrete(ULWC), such as cracking caused by drying and deterioration by freeze-thaw cycles too fast, a new method was put forward, in which the moisture content of the ULWC specimen was adjusted by controlling draining time after soaked in water, and then the mode of freezing and thawing cycle in air was used. The effects of test parameters such as draining time of specimen, thawing temperature and specimen size on the strength loss rate and mass loss rate of ULWC were studied. The results show that controlling the draining time can effectively adjust the moisture content of the specimen. Both the freeze-thaw mass loss rate and strength loss rate of the specimens generally show a downward trend with the extension of the draining time. Lowering the melting temperature can effectively solve the problem of cracking of ULWC specimen during the freeze-thaw test. The smaller size of the specimen is relatively more sensitive to temperature, and the larger size of the specimen is severely damaged by freezing and thawing, and is not easy to handle. Based on the research, a new test method suitable for the evaluation of freeze-thaw resistance of ULWC was proposed. The appropriate drain time, thawing temperature and specimen size were determined to be 6 h, 15 °C and 100 mm×100 mm×100 mm, respectively. The results can provide a reference for the frost resistance test of ULWC.
    劉迪,王玲,王振地,等.超輕質混凝土的抗凍性試驗方法研究[J].混凝土與水泥制品,2022(6):31-36. LIU D,WANG L,WANG Z D,et al.Test Method for Freeze-thaw Resistance of Ultra-lightweight Concrete[J].China Concrete and Cement Products,2022(6):31-36.
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