摘   要：利用X射线衍射仪和SEM扫描电子显微镜观察了碳酸化预处理前后钢渣粉的矿物组成和微观形貌，研究了碳酸化钢渣粉等质量（5%、15%、25%）替代水泥和等质量替代矿渣粉（碳酸化钢渣粉用量占胶凝材料总量的10%、20%）对混凝土工作性和力学性能的影响。结果表明：经过碳酸化预处理后，钢渣粉中的MgO和f-CaO含量分别降低了72.86%和88.86%，并伴有尺寸约为1 μm的颗粒状晶体产生；随着碳酸化钢渣粉替代水泥比例的增加，试件的抗压强度先增大后减小，坍落度和凝结时间均逐渐增大；当水泥用量为胶凝材料总量的50%时，随着碳酸化钢渣粉替代矿渣粉比例的增加，试件的抗压强度降低，初始坍落度减小，凝结时间延长；当水泥用量为胶凝材料总量的70%时，随着碳酸化钢渣粉替代矿渣粉比例的增加，试件的抗压强度先增大后减小，初始坍落度减小，凝结时间延长。碳酸化钢渣粉已成功应用于道路及地坪工程用混凝土的配合比设计中。 Abstract: The mineral composition and microstructure of steel slag powder before and after carbonation pretreatment were observed by X-ray diffractometer and SEM scanning electron microscope, and the effects of carbonated steel slag powder instead of cement(5%, 15%, 25%) and instead of slag powder(the amount of carbonated steel slag powder accounted for 10% and 20% of the cementitious material) on the workability and mechanical properties of concrete were studied. The results show that after carbonation pretreatment, the content of MgO and f-CaO in steel slag powder are reduced by 72.86% and 88.86% respectively, and granular crystals with a size of about 1 μm are produced. With the increase of the ratio of carbonated steel slag powder instead of cement, the compressive strength of the specimen first increases and then decreases, and the slump and setting time gradually increase. When the cement dosage is 50% of the total cementitious material, with the increase of the ratio of carbonated steel slag powder instead of slag powder, the compressive strength of the specimen decreases, the initial slump decreases, and the setting time increases. When the cement dosage is 70% of the total cementitious material, with the increase of the ratio of carbonated steel slag powder instead of slag powder, the compressive strength of the specimen first increases and then decreases, the initial slump decreases, and the setting time increases. Carbonated steel slag powder has been successfully used in the mix proportion design of concrete for road and floor engineering.

王瑾,刘健,潘红,等.碳酸化预处理钢渣粉在混凝土中的研究与应用[J].混凝土与水泥制品,2022(5):90-94. WANG J,LIU J,PAN H,et al.Research and Application of Carbonated Pretreatment Steel Slag Powder in Concrete[J].China Concrete and Cement Products,2022(5):90-94.

摘   要：研究了冻融循环、干湿循环、冻融循环+干湿循环、冻融-干湿耦合循环对不同替代率废玻璃骨料混凝土耐久性能的影响。结果表明：与未冻融、未干湿试件相比，经历冻融循环、冻融循环+干湿循环、冻融-干湿耦合循环试件的抗压强度降低、质量损失率增大，而经历干湿循环试件的抗压强度提高、质量损失率减小；不同损伤机制对废玻璃混凝土耐久性能的影响程度由小到大顺序为干湿循环<冻融循环+干湿循环<冻融循环<冻融-干湿耦合循环。 Abstract: The effects of freeze-thaw cycle, dry-wet cycle, freeze-thaw cycle + dry-wet cycle and freeze-thaw and dry-wet coupling cycle on the durability of concrete with different waste glass aggregate replacement rates were studied. The results show that compared with the no freeze-thaw and no dry-wet specimen, the compressive strength of the specimen subjected to freeze-thaw cycle, freeze-thaw cycle + dry-wet cycle, and freeze-thaw and dry-wet coupling cycle decreases and the mass loss rate increases, while the compressive strength of the specimen subjected to dry-wet cycle increases and the mass loss rate decreases. The degree of the influence of different damage mechanisms on the durability of waste glass concrete is in the order of dry-wet cycle < freeze-thaw cycle + dry-wet cycle < freeze-thaw cycle < freeze-thaw and dry-wet coupling cycle.

张楚,王凤池,马一方.冻融和干湿循环对废玻璃混凝土耐久性能的影响研究[J].混凝土与水泥制品,2022(5):95-99,104. ZHANG C,WANG F C,MA Y F.Study on the Influence of Freeze-thaw and Dry-wet Cycle on the Durability of Waste Glass Concrete[J].China Concrete and Cement Products,2022(5):95-99,104.

摘   要：电弧炉粉尘（EAFD）是电弧炉炼钢过程中产生的固体废物，采用水泥对EAFD进行吸收和消耗是理想的处理办法之一。介绍了EAFD的形成过程和化学组成，分析了EAFD在水泥混凝土中的作用机理，综述了EAFD在水泥混凝土领域的研究与应用进展，提出了目前研究中存在的问题，展望了水泥混凝土用EAFD未来的研究方向。 Abstract: Electric arc furnace dust (EAFD) is a solid waste generated in the electric arc furnace steelmaking process. Absorption and consumption of EAFD by cement is one of the alternative treatment methods. The formation process and chemical composition of EAFD are introduced. The mechanism of action of EAFD in cement concrete is analyzed. The research and application progress of EAFD in the field of cement concrete are reviewed. The problems existing in the current research are put forward. The future research direction of EAFD for cement concrete is prospected.

岳汉威,王清.电弧炉粉尘在水泥混凝土领域的研究与应用进展[J].混凝土与水泥制品,2022(5):100-104. YUE H W,WANG Q.Research and Application Progress of Electric Arc Furnace Dust in the Field of Cement Concrete[J].China Concrete and Cement Products,2022(5):100-104.

摘   要：JC/T 2608—2021《混凝土水化温升抑制剂》已于2021年7月1日开始实施，为便于使用方更准确地理解标准条款的具体含义，正确贯彻实施标准的具体要求和规定，介绍了JC/T 2608—2021标准的编制背景、编制目的和意义，并对其主要条款进行了解读。 Abstract： The standard JC/T 2608—2021 Concrete Temperature Rise Inhibitor was officially issued on July 1st, 2021. In order to help users accurately understand the specific meaning of the standard terms and correctly implement this standard specification, the background, purpose, and meanings of the standard are introduced, and the main contents of the standard are interpreted in detail.

王文彬,王瑞,王育江,等.JC/T 2608—2021《混凝土水化温升抑制剂》标准解读[J].混凝土与水泥制品,2022(5):86-89. WANG W B,WANG R,WANG Y J,et al.Standard Interpretation of JC/T 2608—2021 Concrete Temperature Rise Inhibitor[J].China Concrete and Cement Products,2022(5):86-89.

摘   要：对陶粒、陶砂进行预湿处理，并将其用于配制高强硅酸盐陶粒混凝土，研究了水胶比、漂珠掺量、陶砂取代率对高强硅酸盐陶粒混凝土性能的影响。结果表明：预吸水陶粒、陶砂具备改善界面性能、内养护等多重作用，可有效提高轻骨料混凝土的强度；水胶比是决定轻骨料混凝土强度的关键因素，随着水胶比的降低，轻骨料混凝土的强度增长明显；减重材料如漂珠应谨慎使用，使用时应设置合理的应用区间，避免轻骨料混凝土中的水分含量出现较大波动。 Abstract: The ceramsite and ceramic sand were pre-wetted and used to prepare high-strength silicate ceramsite concrete. The effects of water-binder ratio, fly ash cenosphere content and ceramic sand replacement rate on the properties of high-strength silicate ceramsite concrete were studied. The results show that pre-absorbent ceramsite and ceramic sand have multiple functions such as improving the interface performance and internal curing, which can effectively increase the strength of lightweight aggregate concrete. The water-binder ratio is the key factor in determining the strength of lightweight aggregate concrete. As the water-binder ratio decreases, the strength of lightweight aggregate concrete increases significantly. Weight-reducing materials such as fly ash cenosphere should be used with caution, and a reasonable application interval should be set to avoid large fluctuations in the moisture content of lightweight aggregate concrete.

朱然,王圣怡,占羿箭.高强硅酸盐陶粒混凝土的制备及性能研究[J].混凝土与水泥制品,2022(5):67-71. ZHU R,WANG S Y,ZHAN Y J.Study on Preparation and Properties of High-strength Silicate Ceramsite Concrete[J].China Concrete and Cement Products,2022(5):67-71.

摘   要：通过强度、干密度测试以及XRD、FTIR、SEM分析，研究了纳米C-S-H对固硫灰蒸压加气混凝土性能及水化产物的影响。结果表明：随着纳米C-S-H掺量的增加，蒸压加气混凝土的干密度和抗压强度均呈先增后降的趋势，且当纳米C-S-H掺量为3%时，蒸压加气混凝土的抗压强度最大，较空白组提高了13.2%；在蒸压养护条件下，纳米C-S-H的掺入一方面促进了体系中的Ca(OH)2与固硫灰中的活性SiO2和Al2O3反应，形成了更多的托贝莫来石和C-S-H凝胶，另一方面加速了托贝莫来石和C-S-H凝胶的生长速度，形成了尺寸更大的反应产物；纳米C-S-H的掺入降低了蒸压加气混凝土中的孔洞率，提高了蒸压加气混凝土的密实度和强度；固硫灰中的三种主要物相与Ca(OH)2的蒸压反应活性大小为薄片叠层状的黏土矿物热分解产物最高，带棱角粒状的石英颗粒次之，球状的铝硅酸钙物相最低。 Abstract: The effects of nano-C-S-H on properties and hydration products of autoclaved aerated concrete with circulating fluidized bed fly ash were studied by strength, dry density tests and XRD, FTIR and SEM analysis. The results show that the dry density and compressive strength of autoclaved aerated concrete increase first and then decrease with the increase of nano-C-S-H content, and the compressive strength of autoclaved aerated concrete reaches the maximum when the nano-C-S-H content is 3%, which is 13.2% higher than that of blank group. Under the autoclastic curing condition, the addition of nano-C-S-H promotes the reaction of Ca(OH)2 in the system with active SiO2 and Al2O3 in the circulating fluidized bed fly ash, forming more tobermorite and C-S-H gel, and accelerates the growth rate of tobermorite and C-S-H gel, forming reaction products with larger size. The addition of nano-C-S-H reduces the porosity of autoclaved aerated concrete, and improves the density and compressive strength of autoclaved aerated concrete. The autoclaved reaction activity of the three main phases in the circulating fluidized bed fly ash with Ca(OH)2 is that the laminated products of clay are the highest, followed by the angular granular quartz particles, and the spherical phase of calcium aluminosilicate is the lowest.

柏秀奎,林俊豪,曹德光,等.纳米C-S-H对固硫灰蒸压加气混凝土水化产物形成的影响[J].混凝土与水泥制品,2022(5):72-76. BAI X K,LIN J H,CAO D G,et al.Effect of Nano-C-S-H on the Formation of Hydration Products of Autoclaved Aerated Concrete with Circulating Fluidized Bed Fly Ash[J].China Concrete and Cement Products,2022(5):72-76.