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

高钛矿渣UHPC浆体的制备及性能研究

卿婷1，李晓英1，赵杰2，陈泽2，卢忠远1，戚明强2，李军1，*

2023年第11期

摘要

引用本文

摘要：研究了不同养护方式（标准养护、80 ℃蒸汽养护）下，高钛矿渣砂和高钛矿渣粉分别全部取代河砂和粉煤灰对UHPC浆体工作性、力学性能、自收缩性能和抗冻性能的影响，并进行了微观分析。结果表明：与对照组UHPC浆体相比，高钛矿渣UHPC浆体的工作性、力学性能、自收缩性能和抗冻性能基本均有所提高；与标准养护相比，蒸汽养护可以有效促进胶凝材料水化，提升高钛矿渣UHPC浆体的力学性能；在高钛矿渣砂全部取代河砂的基础上，进一步用高钛矿渣粉全部取代粉煤灰后，UHPC浆体的各项性能总体上略有下降。 Abstract: The effects of replacing all river sand and fly ash with high titanium slag sand and high titanium slag powder on the workability, mechanical properties, autogenous shrinkage performance and frost resistance of UHPC slurry under different curing methods(standard curing and 80 ℃ steam curing) were studied, and microscopic analysis was conducted. The results show that compared with the control group UHPC slurry, the workability, mechanical properties, autogenous shrinkage performance and frost resistance of UHPC slurry with high titanium slag were basically improved. Compared with standard curing, steam curing can effectively promote the hydration of cementitious materials and improve the mechanical properties of UHPC slurry with high titanium slag. On the basis of replacing all river sand with high titanium slag sand, and further replacing all fly ash with high titanium slag powder, the overall performance of UHPC slurry slightly decreases.

卿婷,李晓英,赵杰,等.高钛矿渣UHPC浆体的制备及性能研究[J].混凝土与水泥制品,2023(11):77-81. QING T,LI X Y,ZHAO J,et al.Study on preparation and performance of UHPC slurry with high titanium slag[J].China Concrete and Cement Products,2023(11):77-81.

再生混凝土全生命周期碳化的CO2排放评价

雷斌，杨婉莹，余林杰，晏育松*

2023年第11期

摘要

引用本文

摘要：为了减少再生混凝土全生命周期CO2排放量，考虑再生混凝土服役阶段的碳化作用，采用碳化再生粗骨料、CO2环境下搅拌和养护的固碳方式对再生混凝土全生命周期进行碳化设计。运用生命周期评价（LCA）理论，将再生混凝土生命周期分为6个阶段，分别为原材料生产和运输、再生混凝土的生产、运输、施工、服役、拆除，并建立了各阶段CO2排放计算模型，探究了1 m3的C30再生混凝土全生命周期CO2排放量。此外，对再生混凝土全生命周期CO2排放的环境影响进行了评价。结果表明：与仅服役阶段碳化作用下的再生混凝土全生命周期CO2排放量（APL）相比，再生混凝土全生命周期碳化作用下的CO2排放量（BPL）减少；与再生粗骨料固碳相比，再生混凝土搅拌和养护固碳对降低再生混凝土全生命周期CO2排放的作用更好；用再生粗骨料取代部分天然粗骨料可以节约环境成本，减少CO2排放量，具有显著的环境价值和经济价值。 Abstract: In order to reduce the full life cycle CO2 emission of recycled concrete, the carbonization effect during the service stage of recycled concrete was considered, and the carbonization design of the full life cycle of recycled concrete was carried out by using carbonized recycled coarse aggregates, mixing and curing in CO2 environment. Using the theory of life cycle assessment(LCA), the life cycle of recycled concrete was divided into six stages, namely raw material production and transportation, production, transportation, construction, service and demolition of recycled concrete. The CO2 emission calculation models for each stage were established, and the CO2 emission during the full life cycle of 1 m3 of C30 recycled concrete were explored. In addition, the environmental impact of CO2 emission during the full life cycle of recycled concrete was evaluated. The results show that compared with the full life cycle CO2 emission (APL) of recycled concrete under carbonization during the service stage only, the CO2 emissions (BPL) of recycled concrete under full life cycle carbonization are reduced. Compared with the carbon sequestration of recycled coarse aggregates, the mixing and curing of recycled concrete have a better effect on reducing CO2 emission during the full life cycle of recycled concrete. Replacing some natural coarse aggregates with recycled coarse aggregates can save environmental costs, reduce CO2 emission, which has significant environmental and economic value.

雷斌,杨婉莹,余林杰,等.再生混凝土全生命周期碳化的CO2排放评价[J].混凝土与水泥制品,2023(11):82-87. LEI B,YANG W Y,YU L J,et al.CO2 emission evaluation of full life cycle carbonization of recycled concrete[J].China Concrete and Cement Products,2023(11):82-87.

机械-化学耦合激发电解锰渣对水泥基材料性能的影响

徐虎，李犇*，金圣，周俊豪

2023年第11期

摘要

引用本文

摘要：为了解决电解锰渣活性较差、利用率较低的问题，对电解锰渣进行了机械-化学耦合激发，研究了不同激发方式对掺电解锰渣水泥净浆抗折、抗压强度的影响，并进行了SEM、XRD、FTIR分析。结果表明：最佳球料比和球磨时间分别为15∶1、20 min；掺入适量经过球磨处理的电解锰渣可以显著提高试件的抗折、抗压强度；Ca(OH)2和无水Na2SO4激发剂的搭配使用对电解锰渣活性的激发效果比二者分别单独使用的好，最佳n（Ca(OH)2）∶n（Na2SO4）为2∶3，总掺量为1.5%，此时，试件内部结构致密、28 d水化程度较高，28 d抗折、抗压强度分别较基准组提高了43.2%、24.7%。 Abstract: In order to solve the problems of poor activity and low utilization rate of electrolytic manganese slag, the mechanical and chemical coupling excitation method was conducted on electrolytic manganese slag. The effects of different excitation methods on the flexural and compressive strength of cement paste mixed with electrolytic manganese slag were studied, and SEM, XRD and FTIR analysis were conducted. The results show that the optimal ball to powder weight ratio and ball milling time are 15∶1 and 20 min, respectively. Adding an appropriate content of electrolytic manganese slag after ball milling treatment can significantly improve the flexural and compressive strength of the specimen. The combination of Ca(OH)2 and anhydrous Na2SO4 as activators has a better activation effect on the activity of electrolytic manganese slag compared to both as activators alone, and the optimal molar ratio of Ca(OH)2 to anhydrous Na2SO4 is 2:3, and the optimal total content is 1.5%. At this time, the internal structure of the specimen is dense, and the 28 d hydration degree is high, and the 28 d flexural and compressive strength are increased by 43.2% and 24.7% compared to the reference group, respectively.

徐虎,李犇,金圣,等.机械-化学耦合激发电解锰渣对水泥基材料性能的影响[J].混凝土与水泥制品,2023(11):88-92,97. XU H,LI B,JIN S,et al.Effect of mechanical and chemical coupling excitation of electrolytic manganese slag on performance of cementitious materials[J].China Concrete and Cement Products,2023(11):88-92,97.

再生蒸压加气混凝土的性能及水化机理研究

陈永亮1，2，李傲君1，成亮1，陈铁军1，陈君宝1，夏加庚3

2023年第11期

摘要

引用本文

摘要：将废混凝土粉作为硅质材料掺入蒸压加气混凝土中，研究了废混凝土粉的掺量（40%~70%）、蒸压压力（0.9~1.7 MPa）和蒸压时间（4、6、8 h）对蒸压加气混凝土性能的影响，并通过XRD和SEM分析了其水化机理。结果表明：当废混凝土粉掺量为50%、蒸压压力为1.1 MPa、蒸压时间为8 h时，制备的再生蒸压加气混凝土的抗压强度和干密度分别达到7.5 MPa和647 kg/m3，满足相关标准中的A5.0、B06级别要求；蒸压养护促进了蒸压加气混凝土中的硅质材料和钙质材料反应，生成了大量的片状托贝莫来石、半结晶CSH（Ⅰ）、CSH凝胶和少量水化石榴石、硬石膏等水化产物，从而提高了蒸压加气混凝土的强度，降低了其干密度。 Abstract: The effect of the content of waste concrete powder(40%~70%), autoclaved pressure(0.9~1.7 MPa), and autoclaved time(4, 6, 8 h) on the performance of autoclaved aerated concrete was studied by adding waste concrete powder as the siliceous material. The hydration mechanism was analyzed by XRD and SEM. The results show that when the content of waste concrete powder is 50%, the autoclave pressure is 1.1 MPa, and the autoclave time is 8 h, the compressive strength and dry density of the prepared recycled autoclaved aerated concrete can reach 7.5 MPa and 647 kg/m3, respectively, meeting the requirements of A5.0 and B06 in relevant standards. Autoclave curing promotes the reaction of siliceous materials and calcareous materials in autoclaved aerated concrete, and generates a large number of flaky tobermorite, semi crystalline CSH (Ⅰ), CSH gel, and a small amount of hydrated garnet, anhydrite and other hydration products, thus improving the strength of autoclaved aerated concrete and reducing its dry density.

陈永亮,成亮,陈铁军,等.再生蒸压加气混凝土的性能及水化机理研究[J].混凝土与水泥制品,2023(11):93-97. CHEN Y L,CHENG L,CHEN T J,et al.Study on performance and hydration mechanism of recycled autoclaved aerated concrete[J].China Concrete and Cement Products,2023(11):93-97.

废弃混凝土作骨料及掺合料对混凝土性能的影响

毛宁1，2，金超3，刘铁3，吴艳萍3，黄金桥3，蒋俊1，2，*，卢忠远1，张玉蓉4

2023年第11期

摘要

引用本文

摘要：将废弃混凝土制成再生骨料（再生砂和再生石）和再生微粉，研究了再生骨料等体积取代0~100%的天然骨料和再生微粉等质量取代0~20%的水泥对混凝土性能的影响，并进行了微观分析。结果表明：再生骨料的掺入降低了混凝土的工作性，而再生微粉对混凝土工作性的影响不大；掺入适量再生骨料可在一定程度上提高混凝土的抗压强度；仅用再生石取代部分天然石时，再生石的最佳掺量为60%；仅用再生砂取代部分机制砂时，再生砂的最佳掺量为80%；随着再生微粉掺量的增加，试件的抗压强度先增大后减小，最佳掺量为5%。 Abstract: The waste concrete was made into recycled aggregates(recycled sand and recycled stone) and recycled powder, and the effects of replacing 0~100% natural aggregates with recycled aggregates and replacing 0~20% cement with recycled powder on the performance of concrete were studied, and the microscopic analysis was conducted. The results show that the addition of recycled aggregates reduces the workability of concrete, while the influence of recycled powder on the workability of concrete is not significant. Adding an appropriate content of recycled aggregates can improve the compressive strength of concrete to a certain extent. When only using recycled stone to replace some natural stone, the optimal content of recycled stone is 60%. When only using recycled sand to replace some manufactured sand, the optimal content of recycled sand is 80%. As the content of recycled powder increases, the compressive strength of the specimen first increases and then decreases, and the optimal content of recycled powder is 5%.

毛宁,金超,刘铁,等.废弃混凝土作骨料及掺合料对混凝土性能的影响[J].混凝土与水泥制品,2023(11):98-102. MAO N,JIN C,LIU T,et al.Effect of waste concrete as aggregates and admixtures on performance of concrete[J].China Concrete and Cement Products,2023(11):98-102.

疏浚超细砂对混凝土工作性和抗压强度的影响

王卫，陈泳乐，王冠潮

2023年第11期

摘要

引用本文

摘要：为实现航道整治废弃砂的再利用，将泰州长江航道整治工程的疏浚超细砂与机制砂混合作为细骨料，研究了疏浚超细砂的掺量（0、10%、20%、30%、40%、50%）对混凝土工作性和抗压强度的影响。结果表明：随着疏浚超细砂掺量的增加，混凝土的坍落度降低，抗压强度基本呈先增大后减小再增大的趋势；综合考虑混凝土的工作性和抗压强度，建议疏浚超细砂的掺量不超过10%。 Abstract: In order to realize the reuse of waste sand for waterway improvement, dredged ultra-fine sand from Taizhou Yangtze River Waterway Improvement Project was mixed with manufactured sand as fine aggregates, and the effects of the content of dredged ultra-fine sand (0, 10%, 20%, 30%, 40%, 50%) on the workability and compressive strength of concrete were studied. The results show that with the increase of dredged ultra-fine sand content, the slump of concrete decreases, and the compressive strength basically shows a trend of first increasing, then decreasing and then increasing. Taking into account the workability and compressive strength of concrete, it is recommended that the content of dredged ultra-fine sand should not be more than 10%.

王卫,陈泳乐,王冠潮.疏浚超细砂对混凝土工作性和抗压强度的影响[J].混凝土与水泥制品,2023(11):103-105. WANG W,CHEN Y L,WANG G C.Effect of dredged ultra-fine sand on workability and compressive strength of concrete[J].China Concrete and Cement Products,2023(11):103-105.

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