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    蘇州混凝土水泥制品研究院有限公司

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    第十一期

    高吸水樹脂對混凝土性能的影響研究
    高吸水樹脂對混凝土性能的影響研究
    • 魏曉帆1,2,柯國炬1,侯子義2,田 波1
    2015年第11期
    摘要
    引用本文
    摘 要:通過水泥砂漿流動度試驗、水泥膠砂試件強度試驗、水泥膠砂試件干縮試驗、混凝土強度試驗、混凝土孔結構分析和混凝土面板早期誘導開裂試驗,系統研究了高吸水樹脂對水泥膠砂及混凝土性能的影響。結果表明,高吸水樹脂內養護對水泥膠砂試件流動性影響與其吸水性能有重要關系,但在混凝土中則并不明顯;高吸水樹脂對水泥膠砂試件早期干縮有很好的抑制作用,后期干縮抑制效果不明顯;高吸水樹脂對混凝土后期強度降低不大,對混凝土孔結構總孔隙率影響不明顯,高吸水樹脂增大了混凝土大孔的體積,稍微降低了氣孔間距系數;摻吸水樹脂的混凝土要控制早期水分蒸發,避免發生塑性收縮開裂。 Abstract: The influence of two different super absorbent polymers as an internal curing agent on the properties of the cement paste and concrete are studied by investigating the cement mortar flow test, cement mortar strength test, cement mortar specimens shrinkage test, strength test of concrete, concrete pore structure analysis and the concrete early induced cracking test. The experiment results show that influence of SAP on the fluidity of cement mortar has important relationship with its water absorption property, but it is not obvious for the concrete. The SAP can counteract the early shrinkage of cement paste effectively while it is not obvious for the later age. The influence of SAP on the concrete strength and air content are not evident, the spacing factor is attenuated. Early water evaporation must be controlled for concrete with SAP to avoid plastic cracking.
    風積沙混凝土的基本力學性能試驗研究
    風積沙混凝土的基本力學性能試驗研究
    • 包建強1,2,邢永明1,劉 霖3
    2015年第11期
    摘要
    引用本文
    摘 要:用風積沙按一定的比例(質量比為0、10%、30%、50%、70%、90%)替代相同質量河砂,經過配合比設計,制成風積沙混凝土,測定其和易性;然后再制作成不同尺寸立方體、棱柱體試件,測定其抗壓強度和劈裂抗拉強度,確定風積沙最佳替代比例。試驗結果表明,當風積沙替代比例為30%時,風積沙混凝土的和易性良好,能夠滿足施工要求,不同尺寸試件的抗壓強度值和抗拉強度值都達到最大值。進一步分析試驗結果,建立了風積沙混凝土不同尺寸立方體抗壓強度之間的數學關系、軸心抗壓強度和標準立方體抗壓強度的數學關系以及抗拉強度和標準立方體抗壓強度之間的數學關系,研究結果為風積沙混凝土的設計和應用提供一定的理論依據。 Abstract: Through the design of mixture ratio, to make up the aeolian sand concrete, river sand is replaced with the same quality aeolian sand according to certain proportion (mass ratio is 0, 10%, 30%, 50%, 70%, 90%), its workability is determined. And then groups of cubes with different dimensions and prism specimens are prepared. The compressive strength and tensile strength are determined. The best replacement ratio of aeolian sand is determined. The test results show that when the replacement ratio of the aeolian sand is 30%, its workability is best and the compressive strength and tensile strength of different size specimens are largest. Further analyzing test results, the mathematical relationship of the aeolian sand concrete is set up between the cube compressive strength of different sizes, between axial compressive strength and standard cube compressive strength and between tensile strength and standard cube compressive strength. The results of the study provide certain theoretical basis for the design and application of the aeolian sand concrete.
    礦渣與粉煤灰摻量對高延性水泥基復合材料力學性能與應變硬化特性的影響
    礦渣與粉煤灰摻量對高延性水泥基復合材料力學性能與應變硬化特性的影響
    • 郭麗萍1,2,3,諶正凱1,楊亞男1,陳 波4
    2015年第11期
    摘要
    引用本文
    摘 要:高延性水泥基復合材料(High Ductility Cementitious Composites,HDCC)是指在彎曲和拉伸荷載作用下具有應變硬化特性的水泥基復合材料,具有單軸拉伸延性好,耐久性能優異等優點。在材料設計中用大摻量的粉煤灰來替代水泥,以實現更加優異的高延性。本文研究了在聚乙烯醇(polyvinyl alcohol,PVA)纖維體積摻量為1.2%和1.4%時,同時摻入高爐礦渣與粉煤灰制備高延性水泥基復合材料,通過改變高爐礦渣與粉煤灰的摻量,得到試件的抗壓強度、抗折強度與彎曲韌性,用以對比礦渣與粉煤灰不同質量比例對高延性水泥基復合材料力學性能、彎曲韌性和表面裂紋特征的影響規律。結果顯示,當礦渣和粉煤灰摻量分別為總膠凝材料質量的40%和10%時,試件呈現出良好的應變硬化與多縫開裂特性,最大撓度達到10.79mm,極限拉應變為1.26%,裂紋數量達到14條。表明了礦渣的摻入有利于在保證高延性水泥基復合材料具有應變硬化特性的前提下,可以有效提高高延性水泥基復合材料中的強度和彎曲韌性,對于此類材料的工程應用十分有益。 Abstract: High-ductility cementitious composites (HDCC) refers to the cementitious composites with strain hardening properties under bending and tension loading, which has good uniaxial tensile ductility, excellent durability, etc. High content of fly ash is used to replace the cement in order to achieve more excellent ductility. In this study, the volume content of PVA fiber was 1.2% and 1.4%, the blast furnace slag and fly ash added into HDCC. By changing the blast furnace slag and fly ash content, the compressive strength, flexural strength and flexural toughness of specimen obtained to reveal the influence of different mass ratio of slag and fly ash on the mechanical properties, toughness and surface crack characteristics of HDCC. The results showed that when the slag and fly ash were 40% and 10% of the total mass of cementitious materials, the specimen showed a good strain hardening and multiple cracking characteristics, maximum deflection reached 10.79mm, tensile strain capacity of 1.26% and the number of cracks was 14. The incorporation of slag was beneficial to ensure the high ductility of HDCC and effectively improved the strength and flexural toughness of HDCC, which was very useful for engineering applications of these materials.
    水遷移對水泥基材料徐變的影響
    水遷移對水泥基材料徐變的影響
    • 楊 溪1,何智海2,劉 春3
    2015年第11期
    摘要
    引用本文
    摘 要:通過自制的試驗裝置測試混凝土和砂漿的內部相對濕度、水分質量損失和徐變,研究了摻加不同外加劑和礦物摻合料的水泥基材料中水遷移對徐變的影響。結果表明,不同減水劑和復合功能組分對混凝土內部相對濕度和徐變度有不同影響;不同細度石英砂粉對摻有硅灰的水泥基材料的內部相對濕度或水分質量損失以及徐變度有較大影響;加載狀態并未引起水泥基材料內部相對濕度或水分質量損失的變化;水泥基材料內部相對濕度或水分質量損失結果與其徐變度之間沒有對應關系。 Abstract: The internal relative humidity, water loss and creep of concrete and mortar were tested by the self-made test device, and the effect of water migration of cementitious materials with the different addtives and mineral admixtures on creep was studied in order to understand the role of water in the creep process. The results indicate that the effect of different water reducing agent and composite functional components on internal relative humidity and specific creep of concrete is different, the effect of different fineness quartz powder on water loss or internal relative humidity and specific creep of cementitious materials with silica fume is obvious, the loading status does not cause the change of water loss or internal relative humidity of cementitious materials, there is not the corresponding relationship between water loss or internal relative humidity and specific creep of cementitious materials.
    粉煤灰混凝土原始配合比推定方法研究
    粉煤灰混凝土原始配合比推定方法研究
    • 方麗敏1,高小建2,劉春英2,朱衛中1
    2015年第11期
    摘要
    引用本文
    摘 要:提出一種以壓力破碎、酸液溶解、顆粒篩分、高溫灼燒等手段相結合的硬化粉煤灰混凝土原始配合比推定方法和具體操作過程。采用該方法可對摻0~40%粉煤灰的28d齡期硬化混凝土各組成材料進行測試,結果表明,粗、細骨料含量的推定值與理論值偏差可在5%以內,水泥與粉煤灰用量的推定值與理論值偏差可控制在10%左右。利用本方法可以初步推斷出實際工程中硬化粉煤灰混凝土的原始配合比。 Abstract: One method and detailed operating process including pressure crushing, acid dissolution, particle sizing and high temperature treatment were developed to determine mixing proportion of hardened concrete with fly ash. By using this method, the initial mix proportion was measured for hardened concrete containing 0~40% fly ash with 28 day curing age. The results show that the deviation of the measured value and theoretical value for coarse and fine aggregate content is below 5%. And the difference between the measured value and theoretical value for cement and fly ash content is about 10%. Therefore, this method can be used to deduce the original mix proportion for hardened concrete with fly ash in practical engineering.
    新型ANS低堿液體速凝劑的研制與應用
    新型ANS低堿液體速凝劑的研制與應用
    • 馬 強1,夏義兵1,王萬金1,李曉飛1,洪剛華2,賈方方1
    2015年第11期
    摘要
    引用本文
    摘 要:介紹了ANS低堿液體速凝劑的制備工藝及性能特點,研究了有機輔料對速凝劑體系的協同增效作用,測試了ANS低堿液體速凝劑與不同品牌水泥的適應性。結果表明,ANS低堿液體速凝劑具有良好的水泥適應性,并能保證水泥砂漿的早期和后期抗壓強度。該產品已在呼張鐵路哈風井隧道噴射混凝土施工中應用并取得了良好的工程技術效果。 Abstract: Preparation technology and properties of ANS liquid low alkaline accelerator were introduced in this paper. Synergistic effect of different organic materials on accelerator system and the adaptability with different cements were tested. All results show that the adaptability of ANS liquid low alkaline accelerator is good, and it can guarantee the early and late compressive strength of cement mortar. This product has been used in shotcrete of Hafengjing tunnel in Hu-zhang railway, which achieved good effect in engineering.
    高硅石粉在PHC管樁混凝土中的試驗研究
    高硅石粉在PHC管樁混凝土中的試驗研究
    • 向安樂1,許遠榮1,2,嚴天龍1,左文生1
    2015年第11期
    摘要
    引用本文
    摘 要:研究了不同石粉摻量及不同養護制度對混凝土拌合物、硬化混凝土機理的影響及高硅石粉在預應力管樁混凝土中的試驗及等量替代水泥、粉煤灰、礦粉的可行性。試驗結果表明,適量摻入石粉可以明顯改善新拌混凝土的和易性和硬化混凝土的微孔隙結構,進而提高管樁混凝土的耐久性能。 Abstract:The influence of the different stone powder content and different curing system on the mechanism of concrete and hardened concrete mixture and the feasibility of cement, fly ash and mineral powder equivalently replaced by high silica powder to produce prestressed concrete pile are studied. The test results show that the proper amount of adding stone powder can obviously improve the workability of fresh concrete and micro pore structure of hardened concrete, thus improving the durability performance of pile concrete.
    高溫后鋼筋與混凝土局部黏結滑移關系
    高溫后鋼筋與混凝土局部黏結滑移關系
    • 廖杰洪
    2015年第11期
    摘要
    引用本文
    摘 要:對高溫后鋼筋和混凝土之間黏結強度的既有試驗數據進行統計分析,給出了不同溫度作用后帶肋鋼筋與混凝土之間相對殘余黏結強度的均值和均方差。 分析結果表明,其數據符合正態分布,在此基礎上建立了高溫作用后鋼筋與混凝土相對黏結殘余強度均值和具有95%保證率的分位值隨溫度變化的表達式。統計了光圓鋼筋與混凝土之間殘余黏結強度隨所經歷最高溫度的表達式,給出了高溫后鋼筋與混凝土局部黏結滑移本構關系模型。 Abstract:The existing test data on the residual bonding strength between fire-damaged concrete and rebar were collected and analyzed. The mean values and variances of the residual bonding strength between ribbed bars and concrete subjected to different temperature are presented. The analysis shows that the data conforms to normal distribution, thus two formulas are established for relationship between the elevated temperature and the mean value as well as the value with a guarantee rate of 95%. The relationship of temperature and the residual bonding strength between round bar and concrete is also presented. At last the local bond-slip constitutive relationship model is put forward.
    用水泥土引孔的管樁承載力數值分析
    用水泥土引孔的管樁承載力數值分析
    • 王 海1,范存新1,李安勇1,張 浩2
    2015年第11期
    摘要
    引用本文
    摘 要:基于對水泥土引孔樁工藝與常規工藝的現場靜載試驗研究,以現有的試驗數據為基礎,采用有限元分析工具ABAQUS對水泥土引孔樁和直接壓樁進行有限元模擬,對單樁承載力以及樁土之間共同工作特性和相互作用進行數值計算。分析結果表明,通過合理的參數設置和接觸模擬,計算與試驗所得的Q-s曲線吻合良好,水泥土引孔樁的承載力大于相同尺寸的直接靜壓樁,其承載力提高機理是樁側摩阻力的提高。分析結果可為水泥土引孔樁的進一步發展提供借鑒。 Abstract: On the basis of on-site static loading test of guiding hole technology using cement-soil pile and the normal technology, the law of load transfer and the interactive behavior of the pile and soil of the guiding hole pile and the pile is analyzed using the normal technology by the finite element analytical software ABAQUS. The result of analysis shows Q-s curve of test and those of the simulation are consistent with reasonable parameters setting and contact simulation. Besides, the loading capability of the guiding hole pile is bigger than that of the pile using the normal technology in the same size. The mechanism of the improvement of loading capacity is due to the improvement of side soil resistance. Therefore, the analytical conclusions could give help to the further development of guiding hole technology using cement-soil pile.
    尾礦砂混凝土板的力學性能試驗研究
    尾礦砂混凝土板的力學性能試驗研究
    • 管品武1,祝應喜2,孟會英1
    2015年第11期
    摘要
    引用本文
    摘 要:為研究尾礦砂應用于混凝土樓板中的可能性,設計了5塊不同替代率(0、40%、50%、60%、70%)的混凝土單向板對比試驗,研究了尾礦砂替代率對混凝土單向板力學性能的影響規律,為尾礦砂混凝土的推廣利用提供了試驗依據。 Abstract:In order to study the possibility of application of tail sand in concrete floor, an experiment which contains five one-way slabs with different replacement rate (0, 40%, 50%, 60% and 70%) is designed and carried out. And the influence of replacement rate of tail sand on cracking load, ultimate load, the maximum width of crack and the mid-span deflection of one-way concrete slabs are studied, which can provided experimental evidences for the popularization and utilization of tail sand concrete .
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