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

再生细骨料干混砂浆力学性能试验研究

高琦1,2,3，肖建庄1，赵艳娜2,3，王浩通2,3，王媛2,3

2021年第3期

摘要

引用本文

摘要：利用含红砖的再生细骨料100%替代天然砂，制备生态干混砂浆，研究了用水量、再生粉料掺量和外加剂掺量对干混砂浆力学性能的影响。结果表明：当再生粉料和外加剂掺量不变时，砂浆强度随着用水量的增大而降低，但56 d强度增长率反而增大；当再生粉料掺量和用水量不变时，外加剂掺量的增加对砂浆各龄期的强度均有负面影响；当外加剂掺量和用水量不变时，再生粉料掺量为20%时，对应的砂浆强度最大，低于或高于此掺量均会使砂浆强度降低；含红砖再生细骨料干混砂浆的后期强度（56 d）仍有较大提升空间。 Abstract: The dry mixed mortar was prepared with 100% recycled fine aggregate containing crushed red brick instead of natural sand. The effects of different water addition, recycled powder content and admixture content on the mechanical properties of dry mixed mortar were studied. The results show that when the recycled powder content and admixture content are constant, the strength of the mortar decreases with the increase of water addition, while the growth rate of 56 d strength increases. When the recycled powder content and the water addition remain unchanged, the increase of admixture content has a negative impact on the strength of the mortar at all ages. When the admixture content and the water addition remain unchanged, the mortar with 20% recycled powder has the highest strength, and the strength of the mortar is reduced when the content is lower or higher than 20%. There is still a large increase space in the late strength (56 d) of dry mixed mortar with red brick recycled fine aggregate.

高琦,肖建庄,赵艳娜,等.再生细骨料干混砂浆力学性能试验研究[J].混凝土与水泥制品,2021(3):93-96. GAO Q,XIAO J Z,ZHAO YN,et al.Experimental Study on Mechanical Properties of Dry Mixed Mortar with Recycled Fine Aggregate[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(3):93-96.

预包浆再生骨料自密实混凝土力学与抗氯离子渗透性研究

金宝宏，宋牧原，谢鑫，曹鑫铖

2021年第3期

摘要

引用本文

摘要：研究了再生粗骨料替代率和骨料包浆对自密实再生混凝土力学性能和抗氯离子渗透性的影响。结果表明：当再生粗骨料替代率分别为30%、60%、100%时，与未包浆再生骨料混凝土相比，预包浆再生骨料混凝土的坍落扩展度分别提高了0.76%、3.33%、5.17%，抗压强度分别提高了5.9%、3.2%、6.1%，劈裂抗拉强度分别提高了5.2%、11.2%、18.2%；随着再生粗骨料替代率的增加，混凝土的电通量值增大，当再生粗骨料替代率分别为30%、60%、100%时，与未包浆再生骨料混凝土相比，预包浆再生骨料混凝土的电通量值分别下降了16.7%、22.9%、8.6%；骨料经过包浆处理后，改善了自密实再生混凝土的力学性能及抗氯离子渗透性。 Abstract: The effects of recycled coarse aggregate replacement rate and aggregate grouting on the mechanical properties and resistance to chloride ion permeability of self-compact recycled concrete were studied. The results show that when the replacement rates of recycled coarse aggregate are 30%, 60% and 100%, compared with the ungrouted concrete, the slump-flow expansion of the grouted concrete are increased respectively by 0.76%, 3.33% and 5.17%, the compressive strength of the grouted concrete are increased respectively by 5.9%, 3.2% and 6.1%, the split tensile strength of the grouted concrete are increased respectively by 5.2%, 11.2% and 18.2%. With the increase of replacement rate of recycled coarse aggregate, the concrete electric flux value increases. When the replacement rates of recycled coarse aggregate are 30%, 60% and 100%, the electric flux values of the grouted recycled concrete decrease respectively by 16.7%, 22.9% and 8.6% compared with ungrouted concrete. The mechanical properties and resistance to chloride ion permeability of the self-compacting recycled concrete are improved after the aggregates are grouted.

金宝宏,宋牧原,谢鑫,等.预包浆再生骨料自密实混凝土力学与抗氯离子渗透性研究[J].混凝土与水泥制品,2021(3):97-100. JIN B H,SONG M Y,XIE X,et al.Study on Mechanical Properties and Resistance to Chloride Ion Permeability of Self-compacting Concrete with Pre-grouted Recycled Aggregate[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(3):97-100.

纳米SiO2对掺污泥焚烧灰水泥胶砂性能的影响

汪洪菊

2021年第3期

摘要

引用本文

摘要：研究了纳米SiO2对污泥焚烧灰-水泥复合胶凝体系性能的影响，并对其水化程度进行了分析。结果表明：随着污泥焚烧灰掺量的增加，复合胶凝体系的标准稠度用水量增加、凝结时间延长，水泥胶砂流动度降低、抗压和抗折强度降低；纳米SiO2的掺入在一定程度上缩短了复合胶凝体系的凝结时间，提高了水泥胶砂的强度，但对工作性不利；掺入纳米SiO2后，复合胶凝体系7 d内的化学结合水生成量和生成速率较高，纳米SiO2对复合胶凝体系早期水化影响较大。 Abstract: The influence of nano-SiO2 on the performance of sludge incineration ash-cement composite cementitious system was studied, and its hydration degree was analyzed. The results show that with the increase of sludge incineration ash content, the standard consistency water requirement of the composite cementitious system increases, the setting time is prolonged, the fluidity of the cement mortar decreases, and the compressive and flexural strengths decrease. The incorporation of nano-SiO2 shortens the setting time of the composite cementitious system to a certain extent and improves the strength of cement mortar, but it is not good for workability. After adding nano-SiO2, the amount of chemically bound water and the rate of formation within 7 days of the composite cementitious system are higher, which shows that nano-SiO2 has a great influence on the early hydration of the composite cementitious system.

汪洪菊.纳米SiO2对掺污泥焚烧灰水泥胶砂性能的影响[J].混凝土与水泥制品,2021(3):101-104. WANG H J.Effect of Nano SiO2 on Performance of Cement Mortar with Sludge Incineration Ash[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(3):101-104.

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