摘 ? 要：研究了鐵尾礦砂取代率對機制砂混凝土工作性、力學性能和耐久性能的影響。結果表明：當鐵尾礦砂取代率為40%時，混合砂的顆粒級配及細度模數與河砂相近，此時，混合砂混凝土的工作性和力學性能最優；隨著鐵尾礦砂取代率在一定范圍內增加，混凝土的抗滲性能和抗氯離子侵蝕性能逐步提升。
Abstract: The effect of iron tailings sand replacement rate on the workability, mechanical properties and durability of machined sand concrete was studied. The results show that when the iron tailings sand replacement rate is 40%, the particle size gradation and fineness modulus of the mixed sand are similar to those of river sand. The concrete prepared by the mixed sand shows good workability and mechanical properties. In addition, as the iron tailings sand replacement rate increases within a certain range, the impermeability and the resistance to chloride ion erosion of concrete are gradually improved.
LIU W Y,ZHANG Y L,LI S C,et al.Research on the Influence of Iron Tailings Sand on the Performance of Machined Sand Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(12):84-86.
摘 ? 要：再生混凝土骨料（RCA）表層砂漿的多孔性和高吸水性對再生骨料混凝土的力學性能和耐久性能不利，去除和強化RCA表層砂漿是提高RCA性能的兩種主要方法?；诖?，總結了聚合物、硅酸鈉、微粉、CO2碳化、微生物碳酸鹽沉積等RCA表層附著砂漿強化方法的研究現狀，分析了各RCA強化方法的優缺點，并提出了有待進一步研究的問題，以推進再生混凝土的應用。
Abstract: The porosity and high water absorption of recycled concrete aggregate (RCA) surface mortar are detrimental to the mechanical properties and durability of recycled aggregate concrete. Removal and modification of RCA surface mortar are the two main ways to improve RCA performance. Based on this, the progress on various modification approaches of RCA surface mortar such as polymer coating, sodium silicate modification, micro-powder filling, CO2 carbonation and microbial carbonate deposition is summarized, the advantages and disadvantages of each RCA modification method are analyzed, and the problems to be further studied are put forward to promote the application of recycled concrete.
LIANG C F,DU X M,QIU J Y,et al.Research Progress on Modification Methods of Recycled Concrete Aggregate[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(12):87-91.
摘 ? 要：分析了生活垃圾焚燒爐渣的各項性能指標，并將其經多道水洗、篩分等工藝制成再生骨料，利用再生骨料取代天然砂石制備了透水混凝土。結果表明：生活垃圾焚燒爐渣的粒徑分布較優，基本滿足Ⅱ類建設用砂標準要求；再生骨料透水混凝土的抗壓強度均低于基準組，透水系數均大于10 mm/s；隨著再生骨料（處理后）取代率的增加，試件的28 d抗壓強度逐漸降低；在取代率為100%的情況下，與未處理再生骨料透水混凝土相比，處理后再生骨料透水混凝土的抗壓強度提高了43.1%。
Abstract: ?The various indicators of the domestic waste incinerator slag were analyzed, and it was prepared into recycled aggregate through multiple washing, screening and other processes, and the pervious concrete was prepared by using recycled aggregate instead of natural sand. The results show that the domestic waste incinerator slag basically meets the requirements of Type Ⅱ construction sand standard, and the particle size distribution is better. The compressive strength of recycled aggregate pervious concrete is lower than that of reference group. The permeability coefficient of recycled aggregate pervious concrete is greater than 10 mm/s. With the increase of the replacement rate of recycled aggregate (after treatment), the 28 d compressive strength of specimen gradually decreases. When the replacement rate is 100%, compared with the untreated recycled aggregate pervious concrete, the compressive strength of the treated recycled aggregate pervious concrete is increased by 43.1%.
ZHANG L L,XIE Y F,LIU Z X,et al.Experimental Research on Application of Domestic Waste Incinerator Slag in Pervious Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(12):92-95.
摘 ? 要：利用ASTM C1202法、NT Build 492/RCM法及NEL法對三種市售超高性能混凝土（UHPC）基體預混料的滲透性進行了檢測，以分析其適用性。結果表明：ASTM C1202電量法的測試結果均在100 C以下，難以進行更加細致的區分；NT Build 492/RCM電遷移法即使在60 V下通電500 h，試件中的氯離子顯色深度也多在2 mm以內，由顯色深度讀數引起的測試誤差較大；NEL飽鹽電導率法的測試結果與現有研究結果基本吻合，考慮測試結果的區分度，該法仍是UHPC滲透性檢測的首選之法，但其可靠性仍需更多的實踐檢驗；對于無需測試氯離子擴散系數的場合，可直接采用規定測試條件下的試件電導率（或電阻率）來比較材料的滲透性高低。
Abstract: The ASTM C1202, NT Build 492/RCM and NEL test methods were used to compare the permeability of three commercial ultra-high performance concrete(UHPC) matrix premixes, and the applicability of these methods was analyzed. The results show that the ASTM C1202 electric charge method is mostly below 100 C, and it is difficult to make a more detailed distinction. For the NT Build 492/RCM electric migration test method, the chloride penetration depths after 500 h at 60 V are mostly within 2 mm together with large reading errors causing unavoidable fluctuations. The results of the NEL salt saturated conductivity method are basically consistent with the data reported in the literature, and considering the principle and the resolution, the NEL method is currently the preferred method for UHPC permeability evaluation even though its reliability still needs further practical inspections. For those cases the chloride diffusivities unnecessary, the electrical conductivity or resistivity of the UHPC can be directly employed to compare its permeability under the same testing conditions.
WANG Z H,WEI Y T,LU X Y.Comparison of Three Electrical Testing Methods for Evaluation of Permeability of Ultra-high Performance Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,(12):79-83.
摘 ? 要：為滿足生產工藝要求，考慮原有生產車間特點，研發了可擴展組合式長線臺座法預制構件生產線，并重點闡述了振搗和側翻一體化設備、移動式裝備擺渡設備、自行移動式邊模、鋼筋運輸安裝一體化設備等可移動式裝備的構造要求，以期為預制構件生產線及裝備的研發與應用提供參考和借鑒。
Abstract: In order to meet requirements of production process and considering characteristics of the original workshop, the expandable combined long line pedestal prefabricated component production line is developed. The structural requirements of movable equipment such as vibration and rollover integrated equipment, mobile equipment ferry equipment, self-propelled side formwork and integrated equipment for steel transportation and installation are elaborated to provide a reference for remodeler and application of traditional prefabricated component production line.?
YANG J L,ZHU M T,ZHOU Q.Research and Application of Expandable Combined Long Line Pedestal Prefabricated Component Production Line[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(12):76-78.
摘 ? 要：結合開發的自動化成組立模設備，研究并優化了快速組模、預埋件定位、模板變形和漏漿控制、澆筑振搗和自動養護等關鍵工藝環節，解決了預制混凝土內墻板立模生產的技術難題。通過工程應用，說明了立模生產的內墻板相比平模在質量上有明顯提升。采用立模除了可節省空間外，生產效率大大提高，能耗明顯降低，社會和經濟效益顯著。
Abstract: In combination with the developed automatic group vertical mold equipment, the key technologies such as rapid mold forming, embedded part positioning, formwork deformation and slurry leakage control, casting and vibration,automatic curing are studied and optimized, and the technical difficulties in precast concrete inner wall panel manufacturing technique by using the vertical mold are solved. Through the engineering application, it is shown that the quality of the inner wall panel produced by the vertical mold is significantly improved compared with that of the flat mold.In addition to greatly saving space, the use of the vertical mold greatly improves production efficiency, significantly reduces energy consumption, and has significant social and economic benefits.
ZHAO Z G,YANG S Z,REN C C,et al.Research and Application of Precast Concrete Inner Wall Panel Manufacturing Technique by Using the Vertical Mold[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(12):59-62.
摘 ? 要：基于ABAQUS有限元模擬分析軟件對不同厚度與尺寸的18組板型不銹鋼拉結件進行了模擬，通過數值計算分析的方法確定了其抗剪承載力，得出了板型拉結件應力發展過程。結果表明：板型不銹鋼拉結件具有較大的平面內抗剪承載能力，當拉結件尺寸相同時，其抗剪承載力隨厚度的增加而增大；同厚度、同高度的不銹鋼拉結件的長度越大，抗剪承載力越大；同厚度、同長度的不銹鋼拉結件，隨著高度的增加，其抗剪承載力變化不大；設計中可以屈服強度為基準，安全系數取3.0，確定板型不銹鋼拉結件的允許剪切強度。
Abstract: Based on ABAQUS finite element simulation software, 18 groups of stainless steel tie-in pieces with different thickness and size were simulated, and their shear capacity was determined by numerical calculation and analysis, and the stress development process of the plate type stainless steel tie-in parts was obtained. The results show that the plate type stainless steel tie-in parts have large in-plane shear bearing capacity. When the size of the tie-in parts is the same, the shear bearing capacity increases with the increase of the thickness. The longer the stainless steel tie-in pieces of the same thickness and height, the greater the shear bearing capacity. When the thickness and length of stainless steel pull-out pieces are the same, the shear bearing capacity has little change with the increase of height. The yield strength can be taken as the basis in the design, and the safety factor is taken as 3.0 to determine the allowable shear strength of plate type stainless steel tie-in parts.
ZHENG X,ZHENG Y,LIU H C,et al.Study on Shearing Capacity of Stainless Steel Connector with Sandwich Wall [J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(12):63-67.
摘 ? 要：通過選取典型的足尺試驗模型，從其骨架曲線、荷載及位移等方面進行了ABAQUS驗證，從而得出有限元計算的可靠性?；诖?，進行了高軸壓比（0.5、0.7、0.9）下十字型ECC框架節點在循環荷載下的抗震性能分析。結果表明：設計軸壓比為0.9時框架節點易出現嚴重的節點核心區剪切破壞，耗能相比于0.5軸壓比下降了約11.2%，出現嚴重的塑性變形；0.5軸壓比下位移延性系數μ達到了5.37，所有試件μ均值達到了3.0以上，破壞模型均為延性破壞。
Abstract: The typical full-scale test models were selected and verified by ABAQUS software from the aspects of skeleton curve, load and displacement, so as to obtain the reliability of the finite element method. Based on this, the seismic behavior of ECC frame joints with high axial compression ratio (0.5, 0.7, 0.9) under cyclic load was analyzed. The results show that when the design axial compression ratio is 0.9, the frame joints are prone to serious shear failure in the core area, and the energy consumption is about 11.2% lower than that of the 0.5 axial compression ratio, which leads to serious plastic deformation. When the design axial compression ratio is 0.5, μ reaches 5.37, and the average μ of all specimens reaches above 3.0, and the failure mode is ductile failure.
DING J,ZHOU X,HUANG K.Seismic Performance Analysis of Cross ECC Frame Joints Under Cyclic Load [J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(12):68-72.
摘 ? 要：采用碳化深度測量、SEM、XRD等手段，在特定的環境下研究了不同等級砂加氣混凝土的碳化性能和力學性能。結果表明：由于砂加氣混凝土水化生成的托貝莫來石逐漸轉變為方解石，砂加氣混凝土的抗壓強度隨著碳化深度的增加而明顯下降。
Abstract: The carbonation performance and mechanical properties of different grades of sand aerated concrete were studied under specific conditions by means of depth measurement, SEM and XRD. The results show that the compressive strength of sand aerated concrete decreases obviously with the increase of carbonation depth because of the tobermorite formed by hydration of sand aerated concrete gradually transforms into calcite.
XUE X Y,YANG P,LI J Q,et al.Study on Carbonation Performance of Different Grades of Sand Aerated Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(12):73-75,95.