节能降碳_2023_《混凝土与水泥制品》杂志社

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发布时间：2020-01-06 00:00:00

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节能降碳

碱式硫酸镁水泥的生命周期评价

李莹江1a，徐迅1a，2a，胡海龙1b，李丹1a，余波2a，2b，2c

2023年第3期

摘要

引用本文

摘要：为了评估碱式硫酸镁水泥对环境的影响，采用生命周期评价（LCA）方法，定量分析了碱式硫酸镁水泥的3种原材料在15项中点类别（致癌物质、非致癌物质、可吸入无机物等）和4项终点类别（人类健康、生态系统质量、气候变化、资源消耗）上的影响，并对比分析了不同镁质水泥的环境影响。结果表明：碱式硫酸镁水泥在水生生态毒性上的影响值最高，在臭氧层破坏上的影响值最低；氧化镁在致癌物质、非致癌物质和水生生态毒性上的影响占比较大，均超过85.00%；七水硫酸镁在电离辐射上的影响占比（53.67%）较大；柠檬酸在土地占有上的影响占比（68.80%）较大；在4项终点类别上，氧化镁的环境影响最大，七水硫酸镁次之，柠檬酸最小；与活性氧化镁水泥、磷酸镁水泥、氯氧镁水泥相比，碱式硫酸镁水泥在9项中点类别（致癌物质、非致癌物质、可吸入无机物等）和2项终点类别（气候变化、资源消耗）上优势明显。 Abstract: In order to evaluate the impact of basic magnesium sulfate cement on the environment, life cycle assessment (LCA) method was used to quantitatively analyze the impact of three raw materials of basic magnesium sulfate cement on fifteen midpoint categories (carcinogens, non-carcinogens, inhalable inorganic substances, etc.) and four endpoint categories (human health, ecosystem quality, climate change, resource consumption). The environmental impact of different types of magnesia cement was discussed. The results show that basic magnesium sulfate cement has the highest impact value on aquatic ecotoxicity and the lowest impact value on ozone depletion. Magnesium oxide has a relatively large impact on carcinogens, non-carcinogens and aquatic ecotoxicity, with the impact ratio exceeding 85.00%. The influence of magnesium sulfate heptahydrate on ionizing radiation is relatively large, with the impact ratio of 53.67%. The influence of citric acid on land possession is relatively large, with the impact ratio of 68.80%. In the four endpoint categories, magnesium oxide has the largest environmental impact, followed by magnesium sulfate heptahydrate, and citric acid is the smallest. Compared with the active magnesium oxide cement, magnesium phosphate cement and magnesium oxychloride cement, the basic magnesium sulfate cement has obvious advantages in the nine midpoint categories (carcinogens, non-carcinogens, inhalable inorganic substances, etc.) and two endpoint categories (climate change and resource consumption).

李莹江,徐迅,胡海龙,等.碱式硫酸镁水泥的生命周期评价[J].混凝土与水泥制品,2023(3):78-82. LI Y J,XU X,HU H L,et al.Life Cycle Evaluation of Basic Magnesium Sulfate Cement[J].China Concrete and Cement Products,2023(3):78-82.

钢渣混凝土的抗碳化性能及寿命预测

王成刚1，2，王帅1，马兵辉3，汪陈林1，幸飞宇1

2023年第3期

摘要

引用本文

摘要：采用钢渣石、钢渣砂分别等质量取代碎石、河砂制备了钢渣混凝土，研究了钢渣混凝土的抗碳化性能，并建立了不同保护层厚度钢渣混凝土的碳化寿命预测模型。结果表明：随着钢渣石、钢渣砂取代率的增加，试件的抗碳化性能先增强后减弱，且当钢渣石、钢渣砂取代率均为50%时，试件的抗碳化性能最好；建立的碳化寿命预测模型的精度较高，可为实际工程中钢渣混凝土结构的碳化寿命预测提供参考。 Abstract: Steel slag concrete was prepared by replacing gravel and river sand with steel slag stone and steel slag sand of equal quality. The carbonation resistance of steel slag concrete was studied, and the carbonation life prediction model of steel slag concrete with different protective layer thickness was established. The results show that with the increase of the replacement rate of steel slag stone and steel slag sand, the carbonation resistance of the specimen first increases and then decreases, and when the replacement rate is 50%, the carbonation resistance of the specimen is the best. The established carbonation life prediction model has high accuracy, which can provide a reference for the carbonation life prediction of steel slag concrete structures in practical engineering.

王成刚,王帅,马兵辉,等.钢渣混凝土的抗碳化性能及寿命预测[J].混凝土与水泥制品,2023(3):83-86,91. WANG C G,WANG S,MA B H,et al.Carbonization Resistance and Life Prediction of Steel Slag Concrete[J].China Concrete and Cement Products,2023(3):83-86,91.

硅灰类型对碱集料反应的影响及机理分析

赵明，汪冬冬，张悦然

2023年第3期

摘要

引用本文

摘要：采用快速砂浆棒法研究了原状硅灰和增密硅灰对活性骨料碱集料反应（AAR）的影响，采用岩相法分析了增密硅灰发生反应后的形貌及膨胀开裂现象。结果表明：原状硅灰可以明显地抑制活性骨料发生AAR，增密硅灰则会加剧碱硅酸反应（ASR）；原状硅灰颗粒微小，在砂浆中分散均匀，主要发生火山灰反应，消耗砂浆孔溶液中的碱，降低孔溶液的pH值，且形成的低钙硅比C-S-H凝胶还能进一步捕捉体系中的碱，从而抑制发生AAR；增密硅灰中的部分颗粒难以在砂浆搅拌过程中充分破碎和分散，会与碱发生ASR而非火山灰反应，形成的ASR凝胶吸水膨胀，加剧了活性骨料的AAR和膨胀。 Abstract: The effect of undensified silica fume and densified silica fume on the alkali-aggregate reaction(AAR) of reactive aggregates was studied by using the accelerated mortar bar method. The morphology and expansion cracking of densified silica fume after reaction were analyzed by using the petrographic method. The results show that the undensified silica fume can obviously inhibit the AAR of the reactive aggregates, but the densified silica fume aggravates the alkali-silica reaction(ASR). The undensified silica fume particles are small and evenly dispersed in the mortar, mainly producing pozzolanic reaction, consuming the alkali in the mortar pore solution, reducing the pH value of the pore solution, and the formed low calcium silica ratio C-S-H gel can further capture the alkali in the system, thus inhibiting the AAR. Some particles in densified silica fume are difficult to be fully broken and dispersed during mortar mixing, and will react with alkali in ASR rather than pozzolanic reaction, and the formed ASR gel absorbs water and expands, which intensifies the AAR and the expansion of reactive aggregates.

赵明,汪冬冬,张悦然.硅灰类型对碱集料反应的影响及机理分析[J].混凝土与水泥制品,2023(3):87-91. ZHAO M,WANG D D,ZHANG Y R.Effect of Silica Fume Type on Alkali-aggregate Reaction and Its Mechanism Analysis[J].China Concrete and Cement Products,2023(3):87-91.

铁尾矿粉和磷渣粉对再生混凝土抗氯离子渗透性能的影响

赵俭斌，牟道平，杜松岩，张延年

2023年第3期

摘要

引用本文

摘要：通过RCM试验、电通量试验和氯离子固化试验，研究了铁尾矿粉和磷渣粉分别单掺和复掺（等质量替代30%水泥）对再生混凝土抗氯离子渗透性能的影响。结果表明：单掺和复掺铁尾矿粉与磷渣粉均能提高再生混凝土的抗氯离子渗透性能，且复掺时铁尾矿粉掺量越大，抗氯离子渗透性能越好；随着铁尾矿粉掺量的增加，再生混凝土的氯离子结合能力提高；在氯离子浓度较低的环境下，再生混凝土中的氯离子主要以物理吸附和化学结合两种形式存在；在氯离子浓度较高的环境下，再生混凝土中的氯离子主要以化学结合形式存在，物理吸附作用相对较弱。 Abstract: Through RCM test, electric flux test and chloride ion curing test, the influence of iron tailings powder and phosphorus slag powder (replacing 30% cement) on the chloride ion penetration resistance of recycled concrete was studied. The results show that the chloride ion penetration resistance of concrete can be improved by adding iron tailings powder and phosphorus slag powder. When mixed, the greater the content of iron tailings powder, the better the chloride ion penetration resistance. With the increase of the content of iron tailings powder, the chloride binding capacity of recycled concrete increases. In the environment with low chloride ion concentration, chloride ions in recycled concrete mainly exist in the form of physical adsorption and chemical binding. In the environment with high chloride ion concentration, the chloride ions in recycled concrete mainly exist in the form of chemical binding, and the physical adsorption is relatively weak.

赵俭斌,牟道平,杜松岩,等.铁尾矿粉和磷渣粉对再生混凝土抗氯离子渗透性能的影响[J].混凝土与水泥制品,2023(3):92-95. ZHAO J B,MOU D P,DU S Y,et al.Effect of Iron Tailings Powder and Phosphorus Slag Powder on Chloride Ion Penetration Resistance of Recycled Concrete[J].China Concrete and Cement Products,2023(3):92-95.

再生混凝土粉和再生砖粉活化技术研究进展

方维炯1，宣晓鑫1，赵建明2，崔新忠3，梁超锋3，高越青3

2023年第3期

摘要

引用本文

摘要：介绍了再生混凝土粉（RCP）和再生砖粉（RBP）的基本特性，分析了机械活化、热活化、碳化活化、碱激发等活化方式对RCP和RBP活性的影响，并探讨了相关活化机理，总结了各活化方式的优点与不足，可为再生微粉活化方式的优选提供参考。 Abstract: The basic characteristics of recycled concrete powder (RCP) and recycled brick powder (RBP) are introduced. The effects of mechanical activation, thermal activation, carbonation activation, alkali activation and other activation technologies on the activities of RCP and RBP are analyzed, and the relevant activation mechanisms are discussed. The advantages and disadvantages of each activation technology are summarized, which can provide a reference for the selection of recycled micro powder activation technology.

方维炯,宣晓鑫,赵建明,等.再生混凝土粉和再生砖粉活化技术研究进展[J].混凝土与水泥制品,2023(3):96-101 FANG W J,XUAN X X,ZHAO J M,et al.Research Progress on Activation Technology of Recycled Concrete Powder and Recycled Brick Powder[J].China Concrete and Cement Products,2023(3):96-101

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