節能與環保_2021_《混凝土與水泥制品》雜志社

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節能與環保

摻鋰渣再生混凝土細觀結構與抗壓強度關系研究

陳潔靜，秦擁軍，盧義

2021年第4期

摘要

引用本文

摘 ? 要：基于計算機圖像處理技術，從摻鋰渣再生混凝土的CT圖像中提取出孔隙結構，利用IPP和FractalFox軟件對不同再生粗骨料取代率和不同鋰渣摻量立方體試件的孔隙率、分形維數、形狀因子進行了計算與統計，并對孔隙特征與立方體抗壓強度進行了關聯性研究。結果表明：摻鋰渣再生混凝土的孔隙率與立方體抗壓強度滿足三次方程關系；一定范圍內，孔隙形狀因子與抗壓強度之間的關聯性良好。 Abstract: Based on the computer image processing technology, the pore structure from CT images of recycled concrete with lithium slag was extracted. The porosity, fractal dimension and shape factor of cube specimens with different recycled coarse aggregate replacement rate and different lithium slag content were calculated and counted by IPP and FractalFox software, and the relationship between the three factors and cube compressive strength was studied. The results show that the porosity and compressive strength of recycled concrete with lithium slag satisfy the cubic equation relationship. There is a good correlation between the pore shape factor and compressive strength within a certain range.

陳潔靜,秦擁軍,盧義.摻鋰渣再生混凝土細觀結構與抗壓強度關系研究[J].混凝土與水泥制品,2021(4):88-93. CHEN J J,QIN Y J,LU Y.Study on the Relationship Between Microstructure and Compressive Strength of Recycled Concrete with Lithium Slag[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(4):88-93.

摻粉煤灰再生混凝土聲發射檢測試驗研究

張仕樺1,2，劉京紅1，劉婷3，周雙雙4，劉子倩5

2021年第4期

摘要

引用本文

摘 ? 要：為了研究再生混凝土內部損傷隨應力變化的演變規律，基于聲發射技術對齡期為14 d、28 d、60 d的不同再生粗骨料替代率和不同粉煤灰摻量的混凝土進行了動態檢測，獲得了表征摻粉煤灰再生混凝土損傷演化過程的典型能量-應力圖、撞擊累計數-應力曲線以及聲發射損傷定位圖，探究了再生粗骨料替代率、粉煤灰摻量和齡期對聲發射參數的影響，揭示了各應力階段與內部損傷情況的關系。結果表明：再生粗骨料替代率越高，壓密階段占整個應力上升階段的時間越長，由1/5上升到1/2，且各階段的劃分不突出，應力破壞階段相應提前；摻加適量的粉煤灰可以密實再生混凝土內部的初始缺陷，但是，當粉煤灰摻量為30%時，試塊在塑性階段的撞擊累計數開始出現劇增現象，使得捕捉材料破壞的預兆信息提前；不同齡期對再生混凝土的內部初始缺陷有一定影響，尤其體現在壓密階段和破壞階段的撞擊累計數上。 Abstract: In order to study the evolvement rule of the internal damage of recycled concrete with the change of stress caused by the initial defect, based on acoustic emission technology, dynamic monitoring was conducted for concrete with different recycled coarse aggregate replacement rate and different fly ash content with ages of 14 d, 28 d and 60 d. The typical energy-strain impact cumulative stress curve and acoustic emission damage location diagram representing the damage evolution process of recycled concrete with fly ash were obtained. The influence of recycled coarse aggregate replacement rate, fly ash content and age on acoustic emission parameters was explored, and the relationship between each stress stage and internal damage was revealed. The results show that the higher the recycled coarse aggregate replacement rate, the longer the compaction stage takes up in the whole stress rising stage, from 1/5 to 1/2, and the division of each stage is not convex, and the stress failure stage is corresponding to the premise. Adding appropriate amount of fly ash can compact the internal defects of recycled concrete. However, when the fly ash content is 30%, the cumulative number of impacts of test block in the plastic phase begins to increase dramatically, which leads to the advance of capturing the foreshadowing information of material failure. Different ages have a certain influence on the internal initial defects of recycled concrete, especially in the cumulative impact of compaction stage and failure stage.

張仕樺,劉京紅,劉婷,等.摻粉煤灰再生混凝土聲發射檢測試驗研究[J].混凝土與水泥制品,2021(4):94-98. ZHANG S H,LIU J H,LIU T,et al.Acoustic Emission Detection Experimental Study on Recycled Concrete with Fly Ash[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(4):94-98.

GRC再生混凝土裝飾掛板的研制

肖建莊1，侯逸青1，張寶貴2，李云利2

2021年第4期

摘要

引用本文

摘 ? 要：利用再生骨料制備再生混凝土作為玻璃纖維增強水泥（GRC）掛板的裝飾層，分別從掛板的組成、物理性能和力學性能方面進行了試驗和分析。結果表明：與傳統掛板相比，GRC再生混凝土裝飾掛板更加輕薄，具有優良的物理性能和力學性能。 Abstract: The decorative layer of the glass fiber reinforced cement (GRC) panel was made of recycled aggregate concrete, and the composition, physical and mechanical properties of the panel were tested and analyzed. The results show that compared with the traditional panel, GRC recycled concrete decorative panel is lighter and thinner, and has excellent physical and mechanical properties.

肖建莊,侯逸青,張寶貴,等.GRC再生混凝土裝飾掛板的研制[J].混凝土與水泥制品,2021(4):99-102. XIAO J Z,HOU Y Q,ZHANG B G,et al.Development of GRC Recycled Concrete Decorative Panels[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(4):99-102.

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