节能与环保_2021_《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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节能与环保

掺锂渣再生混凝土细观结构与抗压强度关系研究

陈洁静，秦拥军，卢义

2021年第4期

摘要

引用本文

摘要：基于计算机图像处理技术，从掺锂渣再生混凝土的CT图像中提取出孔隙结构，利用IPP和FractalFox软件对不同再生粗骨料取代率和不同锂渣掺量立方体试件的孔隙率、分形维数、形状因子进行了计算与统计，并对孔隙特征与立方体抗压强度进行了关联性研究。结果表明：掺锂渣再生混凝土的孔隙率与立方体抗压强度满足三次方程关系；一定范围内，孔隙形状因子与抗压强度之间的关联性良好。 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.

陈洁静,秦拥军,卢义.掺锂渣再生混凝土细观结构与抗压强度关系研究[J].混凝土与水泥制品,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.

掺粉煤灰再生混凝土声发射检测试验研究

张仕桦1,2，刘京红1，刘婷3，周双双4，刘子倩5

2021年第4期

摘要

引用本文

摘要：为了研究再生混凝土内部损伤随应力变化的演变规律，基于声发射技术对龄期为14 d、28 d、60 d的不同再生粗骨料替代率和不同粉煤灰掺量的混凝土进行了动态检测，获得了表征掺粉煤灰再生混凝土损伤演化过程的典型能量-应力图、撞击累计数-应力曲线以及声发射损伤定位图，探究了再生粗骨料替代率、粉煤灰掺量和龄期对声发射参数的影响，揭示了各应力阶段与内部损伤情况的关系。结果表明：再生粗骨料替代率越高，压密阶段占整个应力上升阶段的时间越长，由1/5上升到1/2，且各阶段的划分不突出，应力破坏阶段相应提前；掺加适量的粉煤灰可以密实再生混凝土内部的初始缺陷，但是，当粉煤灰掺量为30%时，试块在塑性阶段的撞击累计数开始出现剧增现象，使得捕捉材料破坏的预兆信息提前；不同龄期对再生混凝土的内部初始缺陷有一定影响，尤其体现在压密阶段和破坏阶段的撞击累计数上。 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.

张仕桦,刘京红,刘婷,等.掺粉煤灰再生混凝土声发射检测试验研究[J].混凝土与水泥制品,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再生混凝土装饰挂板的研制

肖建庄1，侯逸青1，张宝贵2，李云利2

2021年第4期

摘要

引用本文

摘要：利用再生骨料制备再生混凝土作为玻璃纤维增强水泥（GRC）挂板的装饰层，分别从挂板的组成、物理性能和力学性能方面进行了试验和分析。结果表明：与传统挂板相比，GRC再生混凝土装饰挂板更加轻薄，具有优良的物理性能和力学性能。 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.

肖建庄,侯逸青,张宝贵,等.GRC再生混凝土装饰挂板的研制[J].混凝土与水泥制品,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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