第十期_2018_《混凝土與水泥制品》雜志社

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第十期

滲透結晶型防水劑對水泥基材料自修復性能的影響及其機理研究

胡洋1，2，刁龍2，鄧鑫1，2，盧忠遠1，2，呂淑珍2，賴振宇1，2

２０18年第10期

摘要

引用本文

摘要：為了明確水泥基滲透結晶型防水劑對水泥基材料自修復性能的影響，研究了防水劑摻量為0、1%、2%、3%時砂漿試塊裂縫的自愈合過程，并利用XRD、SEM、FT-IR等手段分析了防水劑中的活性物質以及自修復產物的主要成分、晶相和微觀形貌，提出了其對水泥基材料自修復作用機理，對其在工程中的應用以及國內自主研發該類產品具有一定的借鑒作用。 Abstract: In order to clarify the effect of cementitious capillary crystalline waterproofing admixture on the self-healing performance of cementitious materials, the self-healing process of cracks in mortar samples was studied when the amount of waterproofing admixture was 0, 1%, 2% and 3%. Furthermore, XRD, SEM, FT-IR and other characterization methods were used to analyze the main components of the activated chemical additive in the cementitious capillary crystalline waterproofing admixture, crystal phases and micro-morphologies of self-healing products were aslo investigated. Finally, the self-healing mechanism of the materials was proposed, which had a certain reference to the applications and domestic research of such products.

聚羧酸系減水劑對鋁酸三鈣水化過程的影響

王濤1，胡建安2，王麗娜3，張曹寧4，吳楠4

２０18年第10期

摘要

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摘要：研究聚羧酸系減水劑（PC）對水泥水化特性的影響對控制和改善混凝土性能具有理論指導價值。本文采用熱活性微量熱儀研究了C3A單礦和C3A-石膏體系在水和PC溶液中的水化過程，并通過XRD、SEM等方法分析了水化產物的組成和形貌。結果表明：C3A單礦水化時，PC的摻入能使C3A顆粒分散更好，增大C3A與水的接觸面從而加速了C3A的水化速率，促進了C3AH6形成。對于C3A-石膏體系，C3A與石膏的摩爾比為1∶3時，PC的摻入抑制AFt晶體的生成和生長。 Abstract：It is important to investigate the effects of polycarboxylate superplasticizer (PC) on hydration of cement and to improve the performance of concrete. In this paper, the hydration of C3A and C3A-gypsum with water and PC solution had been investigated characterized by hydration heat tested by thermally activated microcalorimeter. The composition and morphology of hydration products were analyzed via X-ray diffraction and scanning electron microscopy. The results indicate that the dissolution of C3A was accelerated as hydrating in PC solution, and the precipitation of C3AH6 was promoted. For C3A-gypsum system (molar ratio of C3A and gypsum=1∶3), the formation and growth of Ettringite would be delayed.

有機硅類材料對水泥基材料抗硫酸鹽侵蝕性能的影響[J].混凝土與水泥制品

陽凱麗1，2，劉加平3，穆松4

２０18年第10期

摘要

引用本文

摘要：通過膨脹率、楊氏模量等宏觀性能測試，結合XRD、SEM等微觀分析方法，研究了干濕交變條件下內摻和外涂有機硅類材料對水泥基材料抗硫酸鹽侵蝕性能的影響。結果表明：內摻和外涂有機硅類材料均能提高水泥基材料的抗硫酸鹽侵蝕性能。內摻有機硅類材料會降低試件的初始楊氏模量，并且在侵蝕后期生成少量的鈣礬石腐蝕產物。在本文采用的試驗條件下，有機硅類材料的使用方式對其提高水泥基材料的抗硫酸鹽侵蝕性能的作用效果有較大影響，采用外涂的方式其防護效果優于內摻法。 Abstract: Through the macroscopical performance tests such as swelling rate and Young's modulus, combined with XRD, SEM and other microscopic analysis methods, the resistance to sulfate attack of cement-based materials treated with silicone-based materials under dry-wet cycles was studied. The results show that the resistance to sulfate attack of cement-based materials can be improved by the use of internal addition and external coating. The addition of silicone-based materials reduces the initial Young's modulus of cement-based materials and generates a small amount of ettringite product in the later period of erosion. Under the experimental conditions used in this paper, the use of silicone materials has a greater impact on the effect of improving the sulfate resistance of cement-based materials, and the protective effect of the external coating is better than that of the internal addition.

高鐵鈦偏高嶺土對高性能混凝土工作性和抗壓強度的影響

周耀旭1，李世華1，2，田帥1，2，焦巖1，2，杜書赟1

２０18年第10期

摘要

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摘要：研究了2.5%~15%摻量的高鐵鈦偏高嶺土對混凝土工作性和抗壓強度的影響，分析了摻量與強度效應系數Ks、增強效應因子γ的關系。結果表明：混凝土坍落度在（200±20） mm范圍內，偏高嶺土可以改善混凝土的凝聚性和保水性，但顯著增加聚羧酸減水劑的摻量和混凝土經時損失；偏高嶺土對混凝土早期抗壓強度貢獻為負，對后期抗壓強度的貢獻為正。偏高嶺土摻量與28 d強度效應系數Ks及28 d增強效應因子γ均具有顯著的二次多項式關系。偏高嶺土的最佳摻量宜為10%~12.5%，在最佳摻量范圍內，混凝土28 d及60 d 抗壓強度分別增加15%和11%。 Abstract: Six replacement levels（2.5%、5%、7.5%、10%、12.5%、15%）of metakaolin (MK) with high content of Fe-Ti were assigned for high-performance concrete production, and the workability and compressive strength of these concrete were studied. Moreover, the relationship between the MK content and strength effect coefficients (Ks) and strengthening effect factor (γ) was analyzed. The results show that under a given slump range [(200±20) mm], water retentiveness and cohesive of concrete with MK are higher than those of without MK, but the amount of polycarboxylate water reducer and mobility through time are significantly increased. The contribution of MK to the early compressive strength of concrete is negative and that of later compressive strength is positive. From analysis, a significant quadratic polynomial relationship between the MK content and Ks or γ is found. The experiment also indicates that the concrete compressive strength of 28 d and 60 d can be increased by 15% and 11% respectively when the optimum amount of MK is 10%~12.5%.

混凝土用硅氧烷防護與修復材料的研究進展

張國錚，施德安，蔣濤，張群朝

２０18年第10期

摘要

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摘要：硅氧烷因具有優異的疏水性、透氣性以及與混凝土良好的黏結性，是目前較理想的混凝土用防護與修復材料。本文研究了多種硅氧烷防護與修復材料的作用機理、優缺點等，介紹了硅氧烷防護與修復材料在國內外不同工程領域的應用情況，并展望了其發展前景。 Abstract: Siloxane is an ideal protective and repair material for concrete because of its excellent hydrophobicity, permeability and good adhesion to concrete. Here, the function mechanism, advantage and disadvantage of various siloxane protective and reparable materials are reviewed, its application in different engineering fields at home and abroad is introduced. The development prospect of siloxane protective and repair materials is prospected.

改性再生細骨料對膠砂性能影響的試驗研究

夏鑫，孫海燕，張帆，張韓，張有銘

２０18年第10期

摘要

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摘要：采用2%鹽酸溶液、硅烷溶液改性再生細骨料，研究了改性前后再生細骨料的物理性能和膠砂力學性能。研究結果表明，采用兩種改性方法均降低了再生細骨料的吸水率、壓碎指標，用其成型的水泥膠砂力學性能也均得到明顯改善，其28 d的抗折強度趨近于天然細骨料水泥膠砂，硅烷浸泡再生細骨料水泥膠砂為天然細骨料水泥膠砂強度的109%，2%鹽酸浸泡再生細骨料水泥膠砂抗壓強度為天然細骨料膠砂強度的96%。對比2%鹽酸溶液，硅烷浸泡改性再生細骨料效果更為顯著。 Abstract: The recycled fine aggregates were modified with 2% hydrochloric acid solution and silane solution. The physical properties of the recycled fine aggregate before and after the modific ation and the mechanical properties of the cement mortar were studied. The results of the study show that using two kinds of modification methods can reduce the water absorption and the fragm entation index of the recycled fine aggregate, and the mechanical properties of the modified ceme nt mortar after modified fine aggregate can also be significantly improved. The flexural strength is close to that of natural fine aggregate cement mortar. The compressive strength of recycled fine aggregate cement mortar soaked in silane is 109% of that of natural fine aggregate mortar, compressive strength of reclaimed fine aggregate soaked in 2% hydrochloric acid is 96% of the strength of natural fine aggregate cement mortar. Compared with the 2% hydroc hloric acid solution, the silane soaking significantly enhances the effect of regenerating the fine aggregate.

粉煤灰高性能混凝土抗碳化性能研究

劉繼狀，朱琳

２０18年第10期

摘要

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摘要：通過調節配合比設計制備了多種粉煤灰混凝土，系統研究了粉煤灰摻量、種類、水膠比和養護齡期對混凝土抗碳化性能的影響。結果表明：混凝土碳化深度值和碳化速率均隨粉煤灰摻量增加而增加，碳化120 d后W35F60的碳化深度值約為W35F0的7倍；混凝土碳化深度值隨水膠比增加而增大，當粉煤灰摻量為40%時，混凝土最佳水膠比為0.30，其120 d碳化深度值僅11.28 mm；混凝土抗碳化性能：Ⅱ級粉煤灰>Ⅰ級粉煤灰；養護齡期越長，混凝土抗碳化性能越強，當養護齡期為90 d時，混凝土碳化深度值是養護齡期28 d的79.47%。 Abstract: The different mix proportion of fly ash concretes were designed and prepared, the effects of content and type of fly ash, W/B and curing age on the carbonation resistance of concrete were systematically studied. The results show that the carbonation depth and carbonation rate of concrete both increase with the increase of fly ash content. The carbonation depth of W35F60 after carbonization for 120 days is about 7 times that of W35F0. The depth of concrete carbonation increases with the increase of W/C. When the content of fly ash is 40%, the optimal W/B of concrete is 0.30, and the carbonized depth value of 120 d is only 11.28 mm. The carbonation resistance of concrete is: Grade Ⅱ fly ash> Grade Ⅰ fly ash. The longer curing time, the stronger anti-carbonation performance of concrete, when the curing age is 90 days, the concrete carbonation depth is 79.47% of the curing age of 28 days.

全面、深入貫徹黨的十九大精神促進水泥制品高質量發展

曹生龍

２０18年第10期

摘要

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摘要：為提高水泥制品行業產品質量，改變傳統粗放型發展模式，結合實際工作經驗，提出了混凝土檢查井、混凝土排水管、中小口徑混凝土管、預制混凝土箱涵的工藝和設備改進意見，并對其五年發展目標進行了展望。同時，為水泥制品企業發展提供了參考，要求企業在激烈的競爭中不斷創新，在創新中提升質量和經濟效益。 Abstract: In order to improve the quality of cement products and change the traditional extensive development mode, combined with practical work experience, the suggestions for improving the technology and equipment of concrete inspection wells, concrete drainage pipes, small and medium-sized concrete pipes and precast concrete box culverts are put forward, and looks forward to their five-year development goals. A reference for the development of cement products enterprises is provided in the fierce competition, and to improve the quality and economic benefits in the innovation.

雙艙矩形大斷面綜合管廊節段預制拼裝技術

閔傳杰，劉獻偉，王能林，李鵬，郭鋒

２０18年第10期

摘要

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摘要：城市綜合管廊傳統施工工藝受到現場條件及材料等因素制約，存在工期長、工作量及工作面大、人員投入多、施工效率低等缺點。預制節段拼裝技術是解決以上問題的手段之一。本文結合項目實例，介紹了節段拼裝綜合管廊的設計和安裝技術，并通過設備改良、工藝優化提高了管廊成型質量和施工工效。 Abstract：There are many restrictive factors in the conventional construction technology of urban comprehensive corridor, especially in the long period, the workload and the large working face, which causes many difficulties in the personnel investment and low construction efficiency. Precast segmental assembly technology is a good way to solve the above constraints. The design and installation technology of the section assembly utility tunnel in the project example are introduced, the quality and construction efficiency of the tube gallery through the improvement of the equipment and the optimization of the process are improved.

預應力混凝土重載軌枕表面氣孔防治措施

王創江1，蘭英靜2，孫成曉3

２０18年第10期

摘要

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摘要：混凝土表面氣孔麻面是影響預應力混凝土軌枕表觀質量的主要因素之一，嚴重時會影響軌枕的耐久性能。重載預應力混凝土軌枕尺寸較大，在生產過程中容易在軌枕下部出現氣孔，通過對混凝土原材料、配合比、振搗工藝及脫模劑種類等因素進行對比試驗，系統分析了軌枕表面產生氣孔麻面的原因。研究結果表明，適當減小干硬性混凝土增實因數可減少表面氣泡數量，增實因數在1.25~1.30時，混凝土表觀質量較好；增大混凝土砂率可減小氣泡孔徑；提高含氣量可明顯改善混凝土表面狀況，含氣量在2.5%時，混凝土表面氣泡最少。 Abstract: The stomatal surface of concrete is one of the main factors affecting the apparent quality of prestressed concrete sleepers, which can affect the durability of sleepers in serious cases. Heavy load prestressed concrete sleepers have a large size and are prone to air holes in the lower part of the sleepers during the production process. By comparing the concrete raw material, the mix ratio, the vibration process and the type of demoulding agent, the reason for the production of Burr surface on the surface of the rail pillow was analyzed. The experimental results show that increasing the sand rate of concrete can reduce the air bubble aperture. Proper reduction of the dry concrete increase factor can reduce the number of surface bubbles, and when the increase factor is 1.25~1.30, the surface quality of the concrete is better. The surface condition of concrete can be obviously improved by increasing the gas content. When the gas content is 2.5 %, the concrete surface bubbles are the least.

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