节能降碳_2022_《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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节能降碳

纳米C-S-H对全再生粗骨料混凝土性能的影响

俞学飞1，程享勤2，李敏3

2022年第11期

摘要

引用本文

摘要：研究了纳米C-S-H对全再生粗骨料混凝土工作性、力学性能和耐久性能的影响。结果表明：掺入纳米C-S-H后，再生混凝土的初始坍落度和1 h经时保坍能力降低，凝结时间缩短；掺入适量（3.0%）纳米C-S-H可有效提高再生混凝土的抗压、抗折和劈裂抗拉强度，提高再生混凝土的抗碳化性能、抗氯离子渗透性能和抗冻性能。 Abstract: The influence of nano C-S-H on workability, mechanical properties and durability of fully recycled coarse aggregate concrete was studied. The results show that the initial slump and 1 h slump retention capacity of recycled concrete are reduced after adding nano C-S-H, and the setting time is shortened. Adding appropriate amount(3.0%) of nano-C-S-H can effectively improve the compressive, flexural and splitting tensile strength of recycled concrete, and improve the carbonization resistance, chloride ion penetration resistance and frost resistance of recycled concrete.

俞学飞,程享勤,李敏.纳米C-S-H对全再生粗骨料混凝土性能的影响[J].混凝土与水泥制品,2022(11):76-79. YU X F,CHENG X Q,LI M.Effect of Nano C-S-H on Properties of Fully Recycled Coarse Aggregate Concrete[J].China Concrete and Cement Products,2022(11):76-79.

漂浮植生混凝土的制备及其耐水性能研究

蒋涛，潘从玲，刘远祥，曹鑫铖，许志杨，张立力，张蕊

2022年第11期

摘要

引用本文

摘要：制备了漂浮植生混凝土，研究了有机硅憎水剂掺量（0、1%、2%、3%、4%）对漂浮植生混凝土性能的影响，分析了其作用机理。结果表明：随着憎水剂掺量的增加，保证浆体流动度满足要求（150~160 mm）的减水剂用量增大，试件的吸水率降低，表面水接触角增大；随着憎水剂掺量的增加，漂浮植生混凝土的抗压强度呈先增大后减小的趋势，软化系数增大，内部环境pH值降低；采用3%憎水剂制备的漂浮植生混凝土的植生性能良好。 Abstract: The floating planting concrete was prepared, and the influence of the content of organosilicon hydrophobic agent (0, 1%, 2%, 3%, 4%) on the performance of floating planting concrete was studied, and its mechanism was analyzed. The results show that with the increase of the content of hydrophobic agent, the amount of water-reducing agent to ensure the fluidity of the slurry meets the requirements(150~160 mm) increases, the water absorption of the sample decreases, and the surface water contact angle increases. With the increase of the content of hydrophobic agent, the compressive strength of floating planting concrete increases first and then decreases, the softening coefficient increases, and the pH value of the internal environment of floating planting concrete decreases. The floating planting concrete prepared with 3% hydrophobic agent has good planting performance.

蒋涛,潘从玲,刘远祥,等.漂浮植生混凝土的制备及其耐水性能研究[J].混凝土与水泥制品,2022(11):80-83,88. JIANG T,PAN C L,LIU Y X,et al.Study on Preparation and Water Resistance of Floating Planting Concrete[J].China Concrete and Cement Products,2022(11):80-83,88.

复合掺合料对混凝土基本性能的影响研究

石玉光，白雪燕

2022年第11期

摘要

引用本文

摘要：选用粉煤灰、矿粉、钢渣微粉、脱硫石膏配制了混凝土用低收缩复合掺合料，通过正交试验研究了复合掺合料对混凝土性能的影响，确定了各组分的最佳含量。结果表明：与纯水泥体系相比，掺入复合掺合料后，水泥浆体的标准稠度用水量呈波动变化趋势，凝结时间整体呈先降后升的趋势，胶砂强度整体也呈先降后升的趋势，干缩率有所降低。实际应用时，可根据工程要求选择合适的复合掺合料配比。 Abstract: Fly ash, slag, steel slag powder and desulfurized gypsum were selected to prepare low shrinkage composite admixture for concrete. The influence of composite admixtures on the properties of concrete were studied by orthogonal test, and the optimum content of each component was determined. The results show that, compared with the pure cement system, after adding the composite admixture, the standard consistency water consumption of the cement paste fluctuates, the setting time decreases first and then increases as a whole, the strength of the mortar also decreases first and then increases as a whole, and the dry shrinkage decreases to a certain extent. In practical application, the appropriate component proportion of composite admixture should be selected according to the engineering requirements.

石玉光,白雪燕.复合掺合料对混凝土基本性能的影响研究[J].混凝土与水泥制品,2022(11):84-88. SHI Y G,BAI X Y.Study on the Influence of Composite Admixtures on the Properties of Concrete[J].China Concrete and Cement Products,2022(11):84-88.

再生粗骨料自密实混凝土基本性能试验研究

张建彪1，杨永富2，张哲1，季正军2，廖莹3，葛智4，庄培芝4

2022年第11期

摘要

引用本文

张建彪,杨永富,张哲,等.再生粗骨料自密实混凝土基本性能试验研究[J].混凝土与水泥制品,2022(11):89-92. ZHANG J B,YANG Y F,ZHANG Z,et al.Experimental Study on Basic Properties of Self-compacting Concrete with Recycled Coarse Aggregate[J].China Concrete and Cement Products,2022(11):89-92.

可控低强度回填材料的制备及其性能与工程适用性研究

魏建军1，张金喜2，韩丁丁3，邢姣秀1

2022年第11期

摘要

引用本文

摘要：利用水泥、粉煤灰和建筑垃圾再生过程中产生的筛底料制备了可控低强度回填材料，研究了灰砂比、粉砂比和水固比对回填材料流动性、抗压强度、应力-应变关系和承载力的影响。结果表明：回填材料的流动度与用水量有关，受灰砂比和粉砂比的影响较小；回填材料的抗压强度与灰砂比和水固比之间存在较好的幂指数关系；回填材料的承载力受灰砂比和浇筑龄期的影响较大，灰砂比越大，达到承载力要求所需的时间越短；控制水泥掺量在36~96 kg/m3之间时，可制备出后期可开挖性满足回填工程要求的回填材料。实际工程中，需根据工期和经济要求选择合理的水泥掺量。 Abstract: The controlled low-strength backfill material was prepared by using cement, fly ash and the screen bottom material produced in the recycling process of construction waste, and the effects of cement-sand ratio, fly ash-sand ratio and water-solid ratio on the fluidity, compressive strength, stress-strain relationship and bearing capacity of backfill materials were studied. The results show that the fluidity of backfill material is related to the water consumption, and is less affected by cement-sand ratio and fly ash-sand ratio. There is a good power exponent relationship between the compressive strength of backfill materials and the cement-sand ratio and water-solid ratio. The bearing capacity of backfill materials is greatly affected by the cement-sand ratio and pouring age, and the greater the cement-sand ratio, the shorter the time required to reach the bearing capacity requirements. When the cement consumption is controlled between 36~96 kg/m3, the backfill materials with later excavatability meeting the requirements of backfill engineering can be prepared. In actual projects, reasonable cement consumption should be selected according to the construction period and economic requirements.

魏建军,张金喜,韩丁丁,等.可控低强度回填材料的制备及其性能与工程适用性研究[J].混凝土与水泥制品,2022(11):94-97. WEI J J,ZHANG J X,HAN D D,et al.Study on Preparation, Performance and Engineering Applicability of Controlled Low-strength Backfill Materials[J].China Concrete and Cement Products,2022(11):94-97.

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