第四期_2019_《混凝土與水泥制品》雜志社

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第四期

低品位全珊瑚骨料混凝土強度提升技術研究

周文1,2，周永祥1,3，宋普濤1,3，王祖琦1,3，王晶1,3，馮鵬2

２０19年第4期

摘要

引用本文

摘要：采用筒壓強度為3.72 MPa的低品位全珊瑚骨料配制LC30與LC50混凝土，針對低品位全珊瑚骨料混凝土28 d抗壓強度很難超過50 MPa的問題，開展了基于水膠比、骨料預濕和人工海水拌養的抗壓強度提升技術研究。結果表明：珊瑚骨料混凝土抗壓強度隨水膠比減小先增后減，水膠比0.20為極限水膠比，此時混凝土抗壓強度最高；預濕骨料對水膠比較大的LC30混凝土強度提升較小，對于低水膠比的LC50珊瑚骨料混凝土強度提升明顯；海水拌養有利于珊瑚骨料混凝土早期強度增長，但對28 d強度沒有顯著影響。 Abstract: LC30 and LC50 concrete were prepared with low-grade coral aggregate with a cylinder crushing strength of 3.72 MPa. Aiming at the problem that the 28 d compressive strength of low-grade coral aggregate concrete is difficult to exceed 50 MPa, the compressive strength improvement technology based on W/B, aggregate pre-wet and artificial seawater mixing is studied. The results show that the compressive strength of coral aggregate concrete first increases and then decreases with the decline of W/B and 0.20 is the limit of water-to-binder ratio with a highest compressive strength. The pre-wet aggregate has less influence on strength improvement for LC30 coral aggregate concrete with larger W/B, while the strength of LC50 coral aggregate concrete with low W/B is obviously improved. Artificial seawater mixing is beneficial to the early strength growth of coral aggregate concrete, but has no significant effect on 28 d compressive strength.

周文,周永祥,宋普濤,等.低品位全珊瑚骨料混凝土強度提升技術研究[J].混凝土與水泥制品,2019(4):1-3. ZHOU W,ZHOU Y X,SONG P T,et al.Research on Strength Improvement Technology of Low-grade Coral Aggregate Concrete[J].China Concrete and Cement Products,2019(4):1-3.

不同因素對UHPC-普通混凝土黏結強度影響的試驗研究

龍杰，陳慶，蔣正武

２０19年第4期

摘要

引用本文

摘要：通過斜剪切與劈裂抗拉試驗方法研究了超高性能混凝土（UHPC）與普通混凝土（NC）的黏結性能，分析了UHPC關鍵組分、不同界面處理方法、普通混凝土強度等級及不同種類界面劑等因素對UHPC-NC黏結強度的影響。研究結果表明，相較于未處理表面，鋼絲刷毛、表面切槽和表面鑿毛三種界面處理方法分別對C30（C50）基體混凝土與UHPC間的剪切黏結強度提升了32.9%（42.3%）、45.4%（6.5%）、12.8%（15.3%）；使用凈漿、膨脹劑凈漿涂刷黏結界面相較于未處理表面分別對C30（C50）基體混凝土間的剪切黏結強度提高了10.8%（32.3%）和6.8%（14%），抗拉黏結強度提升規律基本一致，而使用環氧樹脂和丁苯凈漿作為界面劑會降低UHPC-NC的黏結性能；相比較素UHPC，摻入鋼纖維和膨脹劑分別對C30（C50）基體與UHPC間的剪切黏結強度提升了16.4%（32%）和6.8%（11.1%），而摻入PVA纖維幾乎無影響。 Abstract: The bonding properties of ultra-high performance concrete (UHPC) and ordinary concrete (NC) were studied by oblique shearing and splitting tensile test. The effects of UHPC key components, different interface treatment methods, ordinary concrete strength grades and different kinds of interface agents on the bond strength of UHPC-NC were studied. The results show that the shear bond strength of C30 (C50) base concrete and UHPC after wire brushing, surface grooving and surface chiseling is increased by 32.9% (42.3%), 45.4%(6.5%), 12.8%(15.3%) respectively, compared with the untreated surface; the shear bond strength of C30 (C50) base concrete and UHPC using cement paste, cement paste with expanding agent is increased by 10.8% (32.3), 6.8%(14%), respectively, compared with the untreated surface, as for split tensile strength, the results are similar. While using cement paste with SBR or epoxy will reduce the bonding strength. Compared with the plain UHPC, the shear bond strength of the C30 (C50) substrates is increased by 16.4% (32%) and 6.8% (11.1%), respectively, and the incorporation of PVA fibers has almost no effect.

龍杰,陳慶,蔣正武.不同因素對UHPC-普通混凝土黏結強度影響的試驗研究[J].混凝土與水泥制品,2019(4):4-8. LONG J,CHEN Q,JIANG Z W.Experimental Study on Effects of Different Factors on Bonding Strength Between UHPC and Ordinary Concrete[J].China Concrete and Cement Products,2019(4):4-8.

摻多膨脹源膨脹劑高強混凝土力學性能及變形性能

段崇凱1，于雷2，馮竟竟1，閻培渝3，韓笑1，張旭東1，魏向明1

２０19年第4期

摘要

引用本文

摘要：通過將氧化鈣-硫鋁酸鈣（CA）膨脹劑與MgO膨脹劑復配獲得了一種多膨脹源膨脹劑，并試驗研究了摻該膨脹劑高強混凝土的抗壓強度、限制膨脹率及自由體積變形性能。結果表明：摻入該多膨脹源膨脹劑等量替代水泥對混凝土的抗壓強度會造成一定程度的下降，但影響程度較??；在前期水養條件下，摻多膨脹源膨脹劑的混凝土其膨脹速率先增大后減小，28 d轉干養條件下，其膨脹會出現回落，但混凝土仍處在膨脹狀態。自由變形試驗中，摻多膨脹源膨脹劑的混凝土在密封養護條件下，先后經歷了“膨脹-收縮-再膨脹”三個變形階段；而干燥養護條件下，則先后經歷了“收縮-膨脹-再收縮-再膨脹”四個變形階段。 Abstract: A kind of expansion agent with multiple expansion sources is obtained by mixing calcium oxide-calcium sulphoaluminate (CA) expander with MgO expander. The compressive strength, limiting expansion rate and free volume deformation of high strength concrete mixed with the expansive agent are studied experimentally. The results show that the concrete compressive strength is decreased to a certain extent by the same amount of expansion agent instead of cement, but the influence degree is small, and under the condition of pre-water culture, the compressive strength of concrete is decreased to a certain extent. When the expansion rate of concrete mixed with the expansive agent first increases and then decreases for 28 days, the expansion of concrete will decrease, but the concrete will always be in the state of expansion. Under the condition of sealed curing, the concrete mixed with the expansive agent has undergone three deformation stages of "expansion-contraction-re-expansion" successively, but under dry curing condition, Concrete has experienced four deformation stages:shrinkage-expansion-re-contraction-re-expansion.

段崇凱,于雷,馮竟竟,等.摻多膨脹源膨脹劑高強混凝土力學性能及變形性能[J].混凝土與水泥制品,2019(4):9-12. DUAN C K,YU L,FENG J J,et al.Mechanical Performance and Def ormation Properties of High-strength Concrete with Multisource Expansion Agent[J].China Concrete and Cement Products,2019(4):9-12.

自密實混凝土性能測試及其在輸變電工程中的應用

余建杰1，朱建平1，劉碧霞2

２０19年第4期

摘要

引用本文

摘要：利用工程所用原材料，進行了強度等級為SCC35自密實混凝土配合比設計，且驗證了其穿越密集鋼筋能力，并應用于某輸變電工程主變基礎的現場實際構件澆筑。結果表明，選擇合理原材料及配合比，采用合適的施工方法，能獲得輸變電工程所需自密實混凝土，免振搗可降低工人的勞動強度及降低噪音，更適用于鋼筋密集構件。 Abstract: Using the raw materials used in the project, the SCC35 self-compacting concrete mix proportion is designed, and its ability to pass through the dense steel bars is verified. The self-compacting concrete is applied to the site pouring of the main transformer foundation of a power transmission project. The results show that the self-compacting concrete for power transmission and transformation project can be obtained by choosing reasonable raw materials and mix ratio and adopting appropriate construction methods. The vibration-free tamping will reduce the labor intensity and noise of workers, and it is more suitable for steel-reinforced dense components.

余建杰,朱建平,劉碧霞.自密實混凝土性能測試及其在輸變電工程中的應用[J].混凝土與水泥制品,2019(4):13-15. YU J J,ZHU J P,LIU B X.Performance Test of Se lf-compacting Concrete and Its Application in Power Transmission and Transformation Projectt[J].China Concrete and Cement Products,2019(4):13-15.

基于凍融損傷下的高性能混凝土力學性能衰減規律研究

張兆文1，周茗如2，魏琴玲2，謝國鑫2

２０19年第4期

摘要

引用本文

摘要：為研究凍融損傷對高性能混凝土力學性能損失的影響，將混凝土置于水或鹽溶液中快速凍融400次后，測其動彈性模量、抗折、抗壓及劈裂抗拉強度。定性分析了凍融循環次數與上述四個評價指標間的關系，并分析了損傷度與相對剩余抗折強度及抗壓強度之間的關系，建立了抗折強度的衰減方程。試驗結果表明：隨著凍融循環次數的增加，混凝土的動彈性模量、抗壓、抗折和劈裂抗拉強度均逐步降低，抗壓強度的衰減速率先增大后減小，動彈性模量、抗折、劈裂抗拉強度則是不斷增大；相同凍融循環條件下，含氣量越低、水膠比越大，凍融損失越大；凍融介質對混凝土的強度損失有一定影響，鹽溶液對強度造成的損失更大；損傷度與相對剩余抗折強度間具有良好的相關性，但與抗壓強度間不具有相關性。 Abstrat: In order to study the effect of freeze-thaw damage on the loss of mechanical properties of high-performance concrete, the concrete was placed in water and salt solution for 400 freeze-thaw cycles. Then, the dynamic modulus, flexural, compressive and splitting tensile strengths were measured. The relationship between freeze-thaw cycle times and the above four evaluation indicators was qualitatively analyzed, and the relationship between damage degree and relative residual flexural strength and compressive strength was also studied, and the attenuation equation of flexural strength was established. The test results show that with the increase of freeze-thaw cycles, the dynamic elastic modulus, compressive strength, flexural and splitting tensile strength of concrete are gradually reduced. The decay rate of compressive strength first increases and then decreases, but the dynamic elastic modulus, flexural resistance, splitting, and tensile strength increase continuously. Under the same freeze-thaw cycle conditions, the lower the gas content and the greater the W/B, the greater the loss of specimen quality, freeze-thaw medium has a certain influence on the strength loss of concrete. The strength loss of the specimen in the salt solution is greater. There is a good correlation between the degree of damage and the relative remaining flexural strength, however, there is correlation with the compressive strength.

張兆文,周茗如,魏琴玲,等.基于凍融損傷下的高性能混凝土力學性能衰減規律研究[J].混凝土與水泥制品,2019(4):16-19. ZHANG Z W,ZHOU M R,WEI Q L,et al.Research of Degradation Law on Mechanical Properties of High-performance Concrete Based on Freeze-thaw Cycles[J].China Concrete and Cement Products,2019(4):16-19.

納米材料對混凝土性能影響研究進展

苗生龍1，周樣梅2，陳奎宇1，黃涌程1，孫陽陽1

２０19年第4期

摘要

引用本文

摘要：綜述了目前國內外學者對納米二氧化硅、納米碳酸鈣、納米二氧化鈦等納米材料在混凝土中的應用及對混凝土力學性能、耐久性能等方面影響的研究進展，總結了目前納米材料在研究及應用中存在的主要問題，并提出了需要進一步深入研究的建議，展望了納米材料在混凝土中應用的發展前景。 Abstract：The research progress of domestic and foreign scholars on the application of nano-materials such as nano-SiO2, nano-CaCO3 and nano-TiO2 in concrete, and their influence on the mechanical properties and durability of concrete are reviewed. The main problems existing in the research and application of nano-materials at present are summarized, and the direction of further in-depth research is suggested. In addition, the prospect of application and development of nano-materials in concrete is forecasted.

苗生龍,周樣梅,陳奎宇,等.納米材料對混凝土性能影響研究進展[J].混凝土與水泥制品,2019(4):20-23. MIAO S L,ZHOU Y M,CHEN K Y,et al.Development Progress of the Influence of Nano-materials on Performance of Concrete[J].China Concrete and Cement Products,2019(4):20-23.

陶粒預處理對輕骨料混凝土性能的影響

劉軍1，2，段超1，崔云鵬3，孫曉波4

２０19年第4期

摘要

引用本文

摘要：主要探究了五種不同預處理方法對輕骨料混凝土物理力學性能和熱工性能的影響，并應用SEM觀察預處理后過渡區界面的微觀結構，研究了產生性能差異的原因。結果表明：預處理方法不同會對陶?；炷猎斐蓛煞N不同的破壞形式；與未處理相比，經預濕處理24 h的陶粒配置的混凝土可以提高混凝土抗壓強度，表觀密度降低了6.3%，且導熱系數相對最??；經預處理后的陶粒制備混凝土會增加混凝土強度和質量損失率，并降低混凝土抗凍性能；SEM結果表明，陶粒預濕24 h處理配制的陶?；炷?，陶粒與水泥石界面區結構致密，黏結較好，能夠有效提高混凝土強度。 Abstract: The effects of five different pretreatment methods on the physical and mechanical properties and thermal properties of lightweight aggregate concrete were investigated. The microstructure of the interface in the transition zone after pretreatment was observed by SEM, and the reasons for the difference in performance was analyzed. The results show that the ceramsite concrete failure includes two forms of bond failure and splitting failure. The the compressive strength of concrete prepared by pre-wetting ceramsite for 24 h is higer than that of concrete prepared by untreated ceramsite, and the apparent density is reduced by 6.3% compared with the concrete prepared with untreated ceramsite, and the thermal conductivity is relatively minimum.The results of 25 freeze-thaw cycles show that the compressive strength loss rate and mass loss rate are the smallest and the frost resistance is the best. SEM observation shows that the ceramsite concrete prepared by pre-wetting ceramsite for 24 hours has a dense structure and good bond between ceramsite and cement stone, which could effectively improve the concrete strength.

劉軍,段超,崔云鵬,等.陶粒預處理對輕骨料混凝土性能的影響[J].混凝土與水泥制品,2019(4):24-28. LIU J,DUAN C,CUI Y P,et al.Effects of Ceramsite Pretreatment Methods on Performance of Lightweight Aggregate Concrete[J].China Concrete and Cement Products,2019(4):24-28.

高分子合成纖維在管片混凝土中的應用研究

明維，王孟波，許國林，張日紅

２０19年第4期

摘要

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摘要：為了解決類矩形盾構管片的裂縫控制及混凝土脆性問題，確保管片尺寸的精度，在混凝土中摻入了高分子合成纖維，研究了其對混凝土性能的影響，并與鋼纖維、玻璃纖維的增強效果進行了對比，探討了高分子合成纖維在管片混凝土中應用的可行性。試驗結果表明，高分子合成纖維、鋼纖維及玻璃纖維的摻加對地鐵管片混凝土工作性和力學性能影響不大，但對混凝土的增韌效果顯著，抗彎性能及抗沖擊性能得到明顯改善。管片混凝土中摻加6 kg/m3的高分子合成纖維和30 kg/m3的鋼纖維具有同等的增韌效果，可減少或部分取代管片混凝土中非結構配筋用量，提高管片的綜合效益。 Abstract: In order to solve the crack control and concrete brittleness of quasi-recangular segments, the properties of concrete with different kinds of fibers were discussed, such as polymer synthetic fibers, steel fibers, and glass fibers. And the feasibility of polymer synthetic fiber in segment was analyzed. The results show that the mixing of fibers has little influence on the working performance and mechanical properties of concrete, and the toughening effect on concrete is remarkable, the bending resistance and impact resistance of concrete are significantly improved. Toughening effect is almost the same, for Polymer synthetic fibers (6 kg/m3) and steel fibers(30 kg/m3)， which can reduce or partially replace the amount of non-structural reinforcement in the segment.

明維,王孟波,許國林,等.高分子合成纖維在管片混凝土中的應用研究[J].混凝土與水泥制品,2019(4):29-32+69. MING W,WANG M B,XU G L,et al.Application Study on Polymer Synthetic Fiber in Segment Concrete[J].China Concrete and Cement Products,2019(4):29-32+69.

粉砂地層中超長樁承載特性室內模型試驗研究

李希鍇1，李永輝1，陳陸杰2

２０19年第4期

摘要

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摘要：通過室內模型試驗，研究了粉砂地層中超長樁的荷載-沉降（Q-s）關系、樁身軸力、樁側摩阻力、樁身壓縮、樁端阻力、樁土相對位移等承載性狀及荷載傳遞規律。結果表明，超長樁的Q-s曲線為緩降型，與端承摩擦樁的Q-s曲線相似。隨樁頂荷載的增加，樁側摩阻力沿樁身分布逐步由一個峰值轉變為兩個峰值，樁身壓縮主要發生在樁身上部，樁側摩阻力隨樁土相對位移增加基本符合雙曲線發揮規律。樁端阻力隨樁頂荷載增加變化可分為緩慢增長段、加速增長段和減緩破壞段，荷載較小時，樁端阻力與樁端位移基本呈線性關系，隨荷載增大，樁端位移加速增長，極限荷載后，樁端出現刺入變形。 Abstract: Through the indoor model test, the load-settlement (Q-s) relationship of the super-long piles in the silt sand stratum, the bearing capacity and load transfer law of pile axial force, pile side friction resistance, pile compression, pile end resistance, relative displacement of pile and soil are studied. The results show that the Q-s curve of the super-long pile is slow descending type, and it shows the end-bearing friction pile. With the increase of the pile top load, the pile side frictional resistance gradually changes from one peak to two peaks along the pile body distribution; Pile compression mainly occurs in the upper part of the pile body. The pile side friction is basically consistent with the hyperbolic law with the increase of relative displacement of pile and soil. With the increase of pile top load, pile tip resistance can be divided into slow growth section, accelerated growth stage and slow failure section. When the load is small, the pile end resistance and the displacement of the pile end are basically linear. As the load increases, the displacement of the pile end accelerates rapidly. After the ultimate load, the pile end appears piercing deformation.

李希鍇,李永輝,陳陸杰.粉砂地層中超長樁承載特性室內模型試驗研究[J].混凝土與水泥制品,2019(4):33-37. LI X K,LI Y H,CHEN L J.Indoor Model Experimental Study on Bearing Characteristic of Super-long Piles in the Silt Sand Stratum[J].China Concrete and Cement Products,2019(4):33-37.

基于西北地區道床板裂縫損傷等級的防裂治裂措施探討

孫拴虎，唐先習，何勇，張景偉，陳備備

２０19年第4期

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摘要：結合道床板裂縫開展情況的調研，分析了無砟軌道板裂縫病害的特征及誘發原因。在考慮裂縫寬度、長度等特征的基礎上改善了原有損傷等級判定的單一指標，提出了混凝土開裂區域裂縫加權總寬度的概念，并以此作為評定道床板混凝土開裂情況和損傷等級的判定標準，以期更好地對道床板的開裂情況和損傷等級進行評定。此外，從設計和施工兩方面分別闡述了道床板開裂的預防措施，并對已開裂需進行修補的裂縫按照道床板裂縫損傷等級給出了相適用的修補材料和修補措施。 Abstract: Based on the investigation of the crack development of the track bed in the field, the characteristics and causes of the cracks in the ballastless track plate are expounded. On the basis of considering the characteristics of crack width and length, the single index of original damage grade is improved. The weighted total width of cracks in the cracking area of concrete is added as a criterion for evaluating the cracking and damage grade of the concrete bed board, which can better evaluate the cracking and damage grade of the bed board. In addition, the precautions for the cracking of the track bed are expounded from the aspects of design and construction, and the relevant repair materials and repairing measures are put forward according to the crack damage grade of the track bed.

孫拴虎,唐先習,何勇,等.基于西北地區道床板裂縫損傷等級的防裂治裂措施探討[J].混凝土與水泥制品,2019(4):38-41. SUN S H,TANG X X,HE Y,et al.Discussion on Crack Prevention and Treatment Measures of Track Bed Slabs Based on Crack Damage Grade in Northwest China[J].China Concrete and Cement Products,2019(4):38-41.

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