節能降碳_2022_《混凝土與水泥制品》雜志社

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節能降碳

核電工程用大摻量礦物摻合料高性能混凝土試驗研究

劉向坤，胡德華，張偉，涂濤

2022年第7期

摘要

引用本文

摘 ? 要：在礦物摻合料總摻量35%~60%和水膠比0.42~0.29的情況下，采用粉煤灰、礦粉復摻，設計了系列大摻量礦物摻合料高性能混凝土（HPC）配合比，試驗研究了礦物摻合料摻量、水膠比對HPC坍落度、抗壓強度、抗碳化性能、抗氯離子滲透性能、早期收縮性能的影響。結果表明：礦物摻合料可顯著改善HPC的性能，且隨著水膠比的降低，礦物摻合料對HPC性能的改善效果更顯著；所制備的大摻量礦物摻合料HPC具有良好的技術可行性，滿足相關核電工程設計要求。 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.

劉向坤,胡德華,張偉,等.核電工程用大摻量礦物摻合料高性能混凝土試驗研究[J].混凝土與水泥制品,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設計

謝洪陽1，董建軍1，戴宜文1，鄧勇1，鄧明偉2

2022年第7期

摘要

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摘 ? 要：通過正交試驗研究了氣泡群摻量、再生微粉摻量、水料比和羥丙基甲基纖維素醚（HPMC）摻量對再生微粉泡沫混凝土性能的影響，并結合功效系數法確定了再生微粉泡沫混凝土的最優配合比。采用SEM和XRD探究了再生微粉泡沫混凝土的微觀結構。結果表明：再生微粉泡沫混凝土的抗壓強度隨著氣泡群摻量、再生微粉摻量的增加呈下降趨勢，隨著水料比的增加呈先上升后下降的趨勢，隨著HPMC摻量的增加呈上升趨勢；再生微粉泡沫混凝土的最優配合比為氣泡群摻量4%、再生微粉摻量30%、水料比0.6、HPMC摻量0.07%；再生微粉泡沫混凝土抗壓強度的提升主要歸因于孔隙細化和HPMC減少了連通孔的產生。 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.

謝洪陽,董建軍,戴宜文,等.再生微粉泡沫混凝土的配合比設計[J].混凝土與水泥制品,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.

再生細骨料的級配優化及對混凝土性能的影響

艾洪祥1，劉洋1，盧霄1，李紹純2，鄭?？?，馬旭東1

2022年第7期

摘要

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摘 ? 要：研究了再生細骨料的摻量和顆粒級配對混凝土工作性、力學性能、抗凍性能和耐久性能的影響。結果表明：再生細骨料的最佳摻量為20%，此時，混凝土的工作性和力學性能較好；采用再生細骨料（Ⅱ區粗砂）等質量替代20%天然砂配制的混凝土工作性、力學性能較優，其28 d抗壓強度相比于采用天然砂的基準組提高了9%，且其抗凍性能、耐久性能與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,劉洋,盧霄,等.再生細骨料的級配優化及對混凝土性能的影響[J].混凝土與水泥制品,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.

廢玻璃粉活性激發及對砂漿性能的影響

岳龍，季濤，周鈺鑫，王晟，蔣銘昊，符濤，張士萍

2022年第7期

摘要

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摘 ? 要：采用堿激發劑和鹽激發劑激發廢玻璃粉的活性，研究了活性激發前后廢玻璃粉對砂漿ASR膨脹和強度的影響。結果表明：未活性激發時，當廢玻璃粉的取代率為10%時，砂漿的抗折強度和膨脹率均優于基準組；堿激發劑可有效侵蝕廢玻璃粉，產生活性SiO2，但堿過量會引起堿骨料反應的發生，降低砂漿的強度和耐久性；鹽激發劑既能促進廢玻璃粉中活性SiO2的釋放，又能生成鈣礬石，提高基體密實度，但摻量過高會造成鈣礬石過量，導致基體結構疏松，從而降低砂漿的強度和耐久性。 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.

岳龍,季濤,周鈺鑫,等.廢玻璃粉活性激發及對砂漿性能的影響[J].混凝土與水泥制品,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.

堿激發礦渣砂漿的介質傳輸性能研究

羅具乾1，萬小梅1,2，王騰3，于琦1,3，徐培蓁1，曾云輝1，劉杰1

2022年第7期

摘要

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摘 ? 要：通過鹽池浸泡試驗研究了非飽和條件下堿激發礦渣砂漿的介質傳輸機理，分析了不同激發劑和粉煤灰摻量對堿激發礦渣砂漿中水分和氯離子傳輸性能的影響。結果表明：水玻璃激發礦渣砂漿的毛細吸水系數較小，強度較高；非飽和條件下，堿激發礦渣砂漿的氯離子傳輸性能顯著低于普通水泥砂漿；水玻璃激發礦渣砂漿的表觀氯離子擴散系數較NaOH激發礦渣砂漿略高。 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.

羅具乾,萬小梅,王騰,等.堿激發礦渣砂漿的介質傳輸性能研究[J].混凝土與水泥制品,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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