节能降碳_2022_《混凝土与水泥制品》杂志社

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节能降碳

核电工程用大掺量矿物掺合料高性能混凝土试验研究

刘向坤，胡德华，张伟，涂涛

2022年第7期

摘要

引用本文

摘要：在矿物掺合料总掺量35%~60%和水胶比0.42~0.29的情况下，采用粉煤灰、矿粉复掺，设计了系列大掺量矿物掺合料高性能混凝土（HPC）配合比，试验研究了矿物掺合料掺量、水胶比对HPC坍落度、抗压强度、抗碳化性能、抗氯离子渗透性能、早期收缩性能的影响。结果表明：矿物掺合料可显著改善HPC的性能，且随着水胶比的降低，矿物掺合料对HPC性能的改善效果更显著；所制备的大掺量矿物掺合料HPC具有良好的技术可行性，满足相关核电工程设计要求。 Abstract: With total percentage of mineral admixture of 35%~60% and water-binder ratio of 0.42~0.29, the high-performance concrete was made blending with fly ash and slag. The effects of mineral admixture content and water-binder ratio on slump, compressive strength, chloride ion penetration resistance, carbonation resistance, and early shrinkage properties of concrete were studied. The results show that the properties of HPC can be significantly improved by blending with mineral admixture, and with reduction of water-binder ratio, the affection is more significantly. The prepared HPC with large percentage of mineral admixture has good technical feasibility and meets the design requirements of nuclear power projects.

刘向坤,胡德华,张伟,等.核电工程用大掺量矿物掺合料高性能混凝土试验研究[J].混凝土与水泥制品,2022(7):83-86. LIU X K,HU D H,ZHANG W,et al.Study on High-performance Concrete with Large Percentage of Mineral Admixture in Nuclear Power Projects[J].China Concrete and Cement Products,2022(7):83-86.

再生微粉泡沫混凝土的配合比设计

谢洪阳1，董建军1，戴宜文1，邓勇1，邓明伟2

2022年第7期

摘要

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摘要：通过正交试验研究了气泡群掺量、再生微粉掺量、水料比和羟丙基甲基纤维素醚（HPMC）掺量对再生微粉泡沫混凝土性能的影响，并结合功效系数法确定了再生微粉泡沫混凝土的最优配合比。采用SEM和XRD探究了再生微粉泡沫混凝土的微观结构。结果表明：再生微粉泡沫混凝土的抗压强度随着气泡群掺量、再生微粉掺量的增加呈下降趋势，随着水料比的增加呈先上升后下降的趋势，随着HPMC掺量的增加呈上升趋势；再生微粉泡沫混凝土的最优配合比为气泡群掺量4%、再生微粉掺量30%、水料比0.6、HPMC掺量0.07%；再生微粉泡沫混凝土抗压强度的提升主要归因于孔隙细化和HPMC减少了连通孔的产生。 Abstract: The effects of bubbles content, recycled micropowder content, water-material ratio and HPMC content on the properties of foamed concrete with recycled micropowder were studied by orthogonal test, and the optimal mix proportion was determined combined with the efficacy coefficient method. The microstructure of foamed concrete with recycled micropowder was investigated by SEM and XRD. The results show that the compressive strength of foamed concrete with recycled micropowder decreases with the increase of the content of bubbles and recycled micropowder, increases first and then decreases with the increase of the water-material ratio, and increases with the increase of the content of HPMC. The optimal mix proportion of foamed concrete with recycled micropowder is 4% of bubbles, 30% of recycled micropowder, 0.6 of water-material ratio and 0.07% of HPMC. The improvement of the compressive strength of foamed concrete with recycled micropowder is mainly attributed to the pore refinement and HPMC reducing the generation of connected pores.

谢洪阳,董建军,戴宜文,等.再生微粉泡沫混凝土的配合比设计[J].混凝土与水泥制品,2022(7):87-91. XIE H Y,DONG J J,DAI Y W,et al.Mix Proportion Design of Foamed Concrete with Recycled Micropowder[J].China Concrete and Cement Products,2022(7):87-91.

再生细骨料的级配优化及对混凝土性能的影响

艾洪祥1，刘洋1，卢霄1，李绍纯2，郑海康1，马旭东1

2022年第7期

摘要

引用本文

摘要：研究了再生细骨料的掺量和颗粒级配对混凝土工作性、力学性能、抗冻性能和耐久性能的影响。结果表明：再生细骨料的最佳掺量为20%，此时，混凝土的工作性和力学性能较好；采用再生细骨料（Ⅱ区粗砂）等质量替代20%天然砂配制的混凝土工作性、力学性能较优，其28 d抗压强度相比于采用天然砂的基准组提高了9%，且其抗冻性能、耐久性能与采用天然砂配制的混凝土相近。 Abstract: The effects of the content and particle gradation of recycled fine aggregate on the workability, mechanical properties, frost resistance and durability of concrete were studied. The results show that the optimum content of recycled fine aggregate is 20%, and the workability and mechanical properties of concrete are better. The concrete prepared with recycled fine aggregate (coarse sand in zone Ⅱ) instead of 20% natural sand has better workability and mechanical properties, and its 28 d compressive strength is 9% higher than that of the reference group with natural sand, and its frost resistance and durability are similar to those of the concrete prepared with natural sand.

艾洪祥,刘洋,卢霄,等.再生细骨料的级配优化及对混凝土性能的影响[J].混凝土与水泥制品,2022(7):92-96. AI H X,LIU Y,LU X,et al.Gradation Optimization of Recycled Fine Aggregate and Its Influence on the Properties of Concrete[J].China Concrete and Cement Products,2022(7):92-96.

废玻璃粉活性激发及对砂浆性能的影响

岳龙，季涛，周钰鑫，王晟，蒋铭昊，符涛，张士萍

2022年第7期

摘要

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摘要：采用碱激发剂和盐激发剂激发废玻璃粉的活性，研究了活性激发前后废玻璃粉对砂浆ASR膨胀和强度的影响。结果表明：未活性激发时，当废玻璃粉的取代率为10%时，砂浆的抗折强度和膨胀率均优于基准组；碱激发剂可有效侵蚀废玻璃粉，产生活性SiO2，但碱过量会引起碱骨料反应的发生，降低砂浆的强度和耐久性；盐激发剂既能促进废玻璃粉中活性SiO2的释放，又能生成钙矾石，提高基体密实度，但掺量过高会造成钙矾石过量，导致基体结构疏松，从而降低砂浆的强度和耐久性。 Abstract: The activity of waste glass powder was stimulated by alkali activator and salt activator, and the effect of waste glass powder before and after activation on the ASR expansion and strength of mortar was studied. The results show that when the replacement rate of waste glass powder without active excitation is 10%, the flexural strength and expansion rate of mortar are better than those of the reference group. Alkali activator can effectively erode waste glass powder and generate active SiO2, but excessive alkali will cause alkali-aggregate reaction and reduce the strength and durability of mortar. Salt activator can not only promote the release of active SiO2 in waste glass powder, but also generate ettringite and improve the compactness of the matrix, but excessive salt activator will cause excessive ettringite, resulting in loose matrix structure, thereby reducing the mortar strength and durability.

岳龙,季涛,周钰鑫,等.废玻璃粉活性激发及对砂浆性能的影响[J].混凝土与水泥制品,2022(7):97-100. YUE L,JI T, ZHOU Y X,et al.Active Excitation of Waste Glass Powder and Its Effect on the Properties of Mortar[J].China Concrete and Cement Products,2022(7):97-100.

碱激发矿渣砂浆的介质传输性能研究

罗具乾1，万小梅1,2，王腾3，于琦1,3，徐培蓁1，曾云辉1，刘杰1

2022年第7期

摘要

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摘要：通过盐池浸泡试验研究了非饱和条件下碱激发矿渣砂浆的介质传输机理，分析了不同激发剂和粉煤灰掺量对碱激发矿渣砂浆中水分和氯离子传输性能的影响。结果表明：水玻璃激发矿渣砂浆的毛细吸水系数较小，强度较高；非饱和条件下，碱激发矿渣砂浆的氯离子传输性能显著低于普通水泥砂浆；水玻璃激发矿渣砂浆的表观氯离子扩散系数较NaOH激发矿渣砂浆略高。 Abstract: The medium transmission mechanism of alkali activated slag mortar under unsaturated condition was studied by salt pool immersion test, and the effects of different activators and fly ash contents on the moisture and chloride ion transport performance of alkali activated slag mortar were analyzed. The results show that the capillary water absorption coefficient of slag mortar activated by water glass is small and the strength is high. Under the unsaturated conditions, the chloride ion transport performance of alkali activated slag mortar is lower than that of ordinary cement mortar. The apparent chloride ion transport coefficient of slag mortar activated by water glass is slightly higher than that of slag mortar activated by NaOH.

罗具乾,万小梅,王腾,等.碱激发矿渣砂浆的介质传输性能研究[J].混凝土与水泥制品,2022(7):101-104. LUO J Q,WAN X M,WANG T,et al.Study on Medium Transmission Performance of Alkali Activated Slag Mortar[J].China Concrete and Cement Products,2022(7):101-104.

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