第七期_2019_《混凝土與水泥制品》雜志社

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第七期

再生細骨料級配對自流平砂漿強度的影響

侯云芬，鄭東昊，周文娟

２０19年第7期

摘要

引用本文

摘要：選擇4.75~1.18 mm、1.18~0.3 mm及0.3 mm以下三個級配的再生細骨料，采用Fuller法、K法和i法進行三級配再生細骨料的組成設計，研究了不同級配組成的再生細骨料對自流平砂漿強度的影響規律。結果表明，三種不同粒徑的再生細骨料， Fuller法獲得的級配組成中小顆粒較多，K法得到的級配組成中小顆粒較少；而三種方法得到的最佳級配組成所對應的砂漿強度中，Fuller法的抗壓強度和抗折強度均最小，i法的強度最高，且在抗壓強度與K法相近的同時表現出更高的抗折強度。最終認為，i法適合本實驗再生細骨料的級配組成設計。 Abstract: In order to study the effect of recycled fine aggregate gradation on strength of self-leveling mortar, the gradation is designed by three methods of Fuller method, K method and i method, using three recycled fine aggregates whose gradation is 4.75~1.18 mm, 1.18~0.3 mm and under 0.3 mm. The results show that there are the most small particles in the gradation obtained by Fuller method and the least small particles in the gradation obtained by K method. The compressive strength and flexural strength of the mortar obtained by Fuller method are the smallest, the compressive strength obtained by i method is similar to that obtained by K method, but the flexural strength is higher than that obtained by K method. The i method is suited to design the gradation of recycled fine aggregate used in self-leveling mortar.

侯云芬,鄭東昊,周文娟.再生細骨料級配對自流平砂漿強度的影響[J].混凝土與水泥制品,2019(7):96-100. HOU Y F,ZHENG D H,ZHOU W J.The Influence of Recycled Fine Aggregate Gradation on Strength of Self-leveling Mortar[J].China Concrete and Cement Products,2019(7):96-100.

納米碳化硅改性水玻璃對再生骨料的強化作用機制研究

徐開東，王繼娜，李志新，馬先偉，牛季收，楊歡，金彪

摘要

引用本文

摘要：為了進一步強化再生骨料、改善再生骨料混凝土的性能，研究了納米碳化硅改性水玻璃對再生骨料的強化效果，并分析了作用機制。結果表明，納米碳化硅改性水玻璃對再生骨料的強化作用明顯，但會受水玻璃濃度和納米碳化硅摻量的影響。水玻璃濃度增大，經水玻璃強化處理的再生骨料表觀密度和堆積密度先增大后減小，吸水率逐漸降低，含水率逐漸增加，壓碎指標先減小后增大；經水玻璃溶液+納米碳化硅復合強化的再生骨料隨著納米碳化硅加入量的增加，表觀密度和堆積密度先增大后減小，吸水率和含水率均先降低后增大，壓碎指標先減小后增大。經濃度為30%的水玻璃溶液+0.75%納米碳化硅浸泡強化的再生骨料，孔隙和裂縫被改性水玻璃填充，再生骨料表面均勻，綜合性能較好，拌制的再生混凝土28 d抗壓強度較未處理的再生骨料拌制的混凝土提高約45%，較天然骨料拌制的混凝土低約10%。 Abstract: In order to intensify the recycled aggregate and improve the properties of recycled concrete further, the strengthening effect and mechanism of sodium silicate modified by nano-SiC on the recycled aggregate concrete were studied. The results show that the strengthening effect is obvious ，but it is influenced by concentration of sodium silicate and addition of nano-SiC. As the concentration of water glass is increased, the apparent density and bulk density of the recycled aggregate treated with water glass are firstly increased, the water absorption is gradually reduced, the water content is gradually increased, and the crushing index is increased firstly. With the increase of nano-SiC content, the apparent density and bulk density of recycled aggregate reinforced by nano-SiC solution increased firstly and then decreased, the water absorption and water content decreased first and then increased, and the crushing index decreased first and then increased. The properties of the recycled aggregate which intensified by modified sodium silicate solution with a concentration of 30% and addition of 0.75% nano-SiC are relatively good. The surface of recycled aggregate is even. Pores and cracks are filled with modified sodium silicate. The 28 d compressive strength of corresponding recycled concrete is about 45% higher than the recycled concrete when the recycled aggregate without any treatment, but it is about 10% lower than that of natural aggregate.

徐開東,王繼娜,李志新,等.納米碳化硅改性水玻璃對再生骨料的強化作用機制研究[J].混凝土與水泥制品,2019(7):91-95. XU K D,WANG J N,LI Z X,et al.Research on Reinforcement Mechanism of Sodium Silicate Modified by Nano-SiC on Recycled Aggregate[J].China Concrete and Cement Products,2019(7):91-95.

再生無砂混凝土抗壓強度研究

孫光林1，王愛勤2，邊亞東1，楊子勝1，洪誠1

２０19年第7期

摘要

引用本文

摘要：為了研究再生無砂混凝土抗壓強度與粒徑大小、水灰比和目標孔隙率的關系，采用廢棄混凝土破碎作為再生骨料制作成試驗樣品，在室內進行抗壓強度試驗。同時為了研究無砂混凝土抗壓強度與粒徑大小之間的非線性關系，采用三次多項式的方法進行擬合。結果表明：目標空隙率對試件抗壓強度具有非線性關系的重要影響；隨著粒徑尺寸的增大，試件抗壓強度先變大再變??；水灰比對試件抗壓強度也會產生一定影響。對試驗數據的三次多項式擬合比較分析中，當水灰比為0.4時，三種目標孔隙率下的擬合度最好。 Absrtact: In order to study the relationship between the compressive strength of recycled non-fine concrete and particle size, water-cement ratio and target porosity, test samples are made from a municipal building concrete waste yard, and the compressive strength test was carried out in laboratory. In addition, to study the non-linear relationship between the compressive strength and particle size of building non-fine concrete, the cubic polynomial method is used to fit. The results show that the target porosity has an important non-linear effect on the compressive strength of specimens. With the increase of particle size, the compressive strength of specimens first increases and then decreases. Water cement ratio also has a certain impact on the compressive strength of specimens. In the comparative analysis of cubic polynomial fitting of experimental data, when the water cement ratio is 0.4, the fitting degree under three different goal porosities is the best.

孫光林,王愛勤,邊亞東,等.再生無砂混凝土抗壓強度研究[J].混凝土與水泥制品,2019(7):88-90. SUN G L,WANG A Q,BIAN Y D,et al.Study on Compression Strength of Recycled Non-fine Concrete[J].China Concrete and Cement Products,2019(7):88-90.

超高索塔結構混凝土裂縫控制關鍵技術研究

徐文1, 張士山2,李軍堂3

２０19年第7期

摘要

引用本文

摘要：建立了基于“水化-溫度-濕度-約束”多場耦合機制的超高索塔高強大體積強約束混凝土結構收縮開裂風險評估模型，定量分析了開裂風險影響因素；采用溫度場與膨脹歷程雙重調控關鍵技術制備了絕熱溫升＜50 ℃、28 d自生體積變形≥50 με的抗裂混凝土；提出了針對性的高強大體積混凝土裂縫控制施工方法。最終形成的集設計、材料、施工、監測于一體的成套技術可控制超高索塔高強大體積混凝土開裂風險＜0.7。 Abstract: Based on the multi-field coupling mechanism of "hydration - temperature - humidity - constraint", the risk assessment model of shrinkage and cracking for large-capacity super-high cable towers with high strong volume and strong constraint concrete structure was established, and the influencing factors of cracking risk were analyzed quantitatively. Adopting the key technology of dual control of temperature field and expansion process，anti-cracking concrete with adiabatic temperature rise <50 °C and 28 d autogenous volume deformation ≥50 με was prepared. A targeted construction method for high strength concrete crack control was proposed. The resulting complete set of technical solutions integrating design, materials, construction and monitoring can control the cracking risk of large-capacity super-high main tower high strength bulk concrete <0.7.

徐文,張士山,李軍堂.超高索塔結構混凝土裂縫控制關鍵技術研究[J].混凝土與水泥制品,2019(7):84-87. XU W,ZHANG S S,LI J T.Research on Key Technology for Crack Control of Super High Cable Tower Structure Concrete[J].China Concrete and Cement Products,2019(7):84-87.

立式徑向擠壓制管成型及擠壓頭研究

陳維星

２０19年第7期

摘要

引用本文

摘要：立式徑向擠壓制管工藝由于具有成型時間短生產效率高、自動化程度高、生產成本低、環保節能等優點廣泛應用于中小口徑鋼筋混凝土排水管的生產。本文闡述了立式徑向擠壓制管的成型機理，對比分析了國內外常用擠壓頭在機械結構、制管效果、安裝調整等方面的差異，同時，介紹了擠壓頭在生產和維護中的注意事項。 Abstract: The vertical radial extrusion pipe producing process is widely used in the production of small and medium-diameter reinforced concrete drainage pipe due to its advantages such as short molding time, high production efficiency, high automation, low production cost, environmental protection and energy saving. The shaping mechanism of vertical radial extrusion pipe is describled, the mechanical structure, production effect and installation adjustment of common extrusion heads at home and abroad are analyzed and compared, and the precautions of the extrusion head in production and maintenance are introduced.

陳維星.立式徑向擠壓制管成型及擠壓頭研究[J].混凝土與水泥制品,2019(7):80-83. CHEN W X.Study on Vertical Radial Extrusion Shaping and Extrusion Head[J].China Concrete and Cement Products,2019(7):80-83.

裝配式混凝土建筑預制凸窗風險影響因素研究

戚仁廣1，鄒軍2，許昂2，梁浩1，凡培紅1

２０19年第7期

摘要

引用本文

摘要：采用文獻研究結合專家訪談調研，探討了裝配式混凝土建筑預制凸窗質量安全風險影響因素；基于風險分析理論，采用層次分析法對識別出的風險影響因素進行數據挖掘，計算得出風險影響因素，為判定裝配式混凝土建筑預制凸窗風險等級提供決策支撐。 Abstract: Combined literature review and Delphi survey, the risk factors of precast concrete bay window were concluded. Based on risk analysis theory, the analytic hierarchy process was used to processing the indentified factors. The risk-affected factors were calculated. The risk factor levels will contribute to the risk level classification of precast concrete bay window.

戚仁廣,鄒軍,許昂,等.裝配式混凝土建筑預制凸窗風險影響因素研究[J].混凝土與水泥制品,2019(7):75-79. QI R G,ZOU J,XU A,et al.The Effecting Risk Factor Research on Precast Concrete Bay Window[J].China Concrete and Cement Products,2019(7):75-79.

橫孔連鎖混凝土砌塊墻體熱工性能研究

楊正俊

２０19年第7期

摘要

引用本文

摘要：設計三種橫孔連鎖混凝土砌塊，研究了連鎖自保溫混凝土砌塊墻體的熱工性能。利用ABAQUS有限元軟件對內部填充保溫材料和內部未填充保溫材料的連鎖混凝土砌塊墻體進行了熱工性能的數值模擬，并計算得出墻體的傳熱系數，得到有利于實際生產和工程應用的砌塊形式。結果表明，墻體各項熱工性能指標良好，H形砌塊墻體的傳熱系數較田字形砌塊墻體大幅度下降。增大孔洞率、減小孔間距和填充保溫材料等有利于提高砌塊的保溫隔熱能力。 Abstract: Three cross-hole interlocking concrete blocks were designed to study the thermal performance of interlocking self-insulating concrete block walls. The ABAQUS finite element software was used to simulate the thermal performance of the interlocking concrete block wall filled with thermal insulation material and internal unfilled thermal insulation material, and the heat transfer coefficient of the wall was calculated. The actual production and engineering application were obtained. The results show that the thermal performance indexes of the wall are good, and the heat transfer coefficient of the H-shaped block wall is much lower than that of the Tian-shaped block wall. Increasing the hole rate, reducing the hole spacing and filling the insulation material are beneficial to improve the thermal insulation capacity of the block.

楊正俊.橫孔連鎖混凝土砌塊墻體熱工性能研究[J].混凝土與水泥制品,2019(7):71-74. YANG Z J.Study on Thermal Properties of Cross-hole Chain Concrete Block Walls[J].China Concrete and Cement Products,2019(7):71-74.

煤粉爐粉煤灰和循環流化床鍋爐粉煤灰的特性及其對蒸壓加氣混凝土性能的影響

劉品德1，陳新疆1，全峰2，陸潔1，丁小龍1

２０19年第7期

摘要

引用本文

摘要：采用煤粉爐粉煤灰和循環流化床粉煤灰進行了蒸壓加氣混凝土性能的研究。結果表明，采用兩種粉煤灰生產的加氣混凝土雖然水化產物基本相同，但由于其組成含量不同對加氣混凝土性能的影響較大。 Abstract: The properties of autoclaved aerated concrete were studied by using pulverized coal ash and circulating fluidized bed ash. The results show that although the hydration products of aerated concrete produced by the two kinds of ash are basically the same, their composition and content have great influence on the performance of aerated concrete.

劉品德,全峰,陸潔,等.煤粉爐粉煤灰和循環流化床鍋爐粉煤灰的特性及其對蒸壓加氣混凝土性能的影響[J].混凝土與水泥制品,2019(7):67-70. LIU P D,QUAN F,LU J,et al.Characteristic of Pu lverized Coal Ash and Circulating Fluidized Bed Ash and the Influence of the Ashes on Performance of Autoclaved Aer ated Concrete[J].China Concrete and Cement Products,2019(7):67-70.

雙摻粉煤灰礦渣泡沫混凝土性能試驗研究

魏向明，董超，馮竟竟，楊進波

２０19年第7期

摘要

引用本文

摘要：采用正交試驗分析，研究了粉煤灰摻量、礦渣摻量、水灰比對泡沫混凝土性能的影響關系。試驗結果表明，在雙摻粉煤灰礦渣泡沫混凝土中，礦渣摻量對泡沫混凝土抗壓強度有顯著地影響，隨著礦渣摻量的增加，泡沫混凝土的抗壓強度不斷增加，并且導熱系數也隨之增加。當礦渣摻量為10%時，雙摻粉煤灰礦渣泡沫混凝土具有最低的導熱系數。 Abstract: The influence of fly ash content, slag content and water-cement ratio on the performance of foamed concrete was studied by orthogonal test. The test results show that the content of slag has a significant impact on the compressive strength of foamed concrete in the fly ash and slag foamed concrete. With the increase of the content of slag, the compressive strength of foamed concrete increases continuously, and the thermal conductivity also increases. When the content of slag is 10%, the foamed concrete has the lowest thermal conductivity.

魏向明,董超,馮竟竟,等.雙摻粉煤灰礦渣泡沫混凝土性能試驗研究[J].混凝土與水泥制品,2019(7):63-66. WEI X M,DONG C,FENG J J,et al.Experimental Research on Properties of Foamed Concrete Mixed with Fly Ash and Slag[J].China Concrete and Cement Products,2019(7):63-66.

大摻量火山灰泡沫混凝土的制備及性能優化

史星祥1，張磊蕾2，滿麗瑩1，李龍梓1

２０19年第7期

摘要

引用本文

摘要：采用天然火山渣經磨細處理后得到的火山灰和水泥作為膠凝材料，通過化學發泡的方法，制備了700級大摻量火山灰發泡混凝土，研究了不同組成和養護條件對火山灰泡沫混凝土的成型狀態、干密度及抗壓強度的影響。結果表明，當膠凝材料總量為700 g（火山灰占70%）、水膠比為0.3、早強劑（CaCl2）摻量為1.8%、穩泡劑（硬脂酸鈣）摻量為0.6%、H2O2摻量為1.5%，減水劑摻量為0.2%，并在85 ℃條件下蒸養24 h時，制備出的700級大摻量火山灰泡沫混凝土性能最佳，其成型狀態良好、干密度為650 kg/m3、抗壓強度為6.6 MPa、導熱系數為0.144 3 W/（m·K） Abstract: High volume volcanic ash foam concrete (700 kg/m3) is prepared by chemical foaming method using volcanic ash obtained by grinding the natural volcanic slag and cement as cementing material of which the volcanic ash accounts for 70%. The results show that when using 700 g cementing material, 0.3 water binder ratio, 1.8% early strength agent (CaCl2), 0.6% foam stabilizer(calcium stearate), 1.5% H2O2, 0.2% water reducing agent, the high volume volcanic ash foam concrete reaches to the best properties under the curing condition with 85 °C for 24 h. The forming state is good; dry density is 650 kg/m3, compressive strength is 6.6 MPa, and thermal conductivity is 0.144 3 W/(m·K).

史星祥,張磊蕾,滿麗瑩,等.大摻量火山灰泡沫混凝土的制備及性能優化[J].混凝土與水泥制品,2019(7):58-62. SHI X X,ZHANG L L,MAN L Y,et al.Preparation and Performance Optimization of Foamed Concrete with High Content of Volcanic Ash[J].China Concrete and Cement Products,2019(7):58-62.

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