第十一期_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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第十一期

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.

预制预应力混凝土楼板设计关键技术与应用

王洪欣，孙占琦，钟志强，芦静夫，黄朝俊

2022年第11期

摘要

引用本文

王洪欣,孙占琦,钟志强,等.预制预应力混凝土楼板设计关键技术与应用[J].混凝土与水泥制品,2022(11):63-67. WANG H X,SUN Z Q,ZHONG Z Q,et al.Design Key Technology and Application of Precast Prestressed Concrete Slabs[J].China Concrete and Cement Products,2022(11):63-67.

水灰比对泡沫混凝土抗压强度和导热系数的影响

曹星星a，党钧陶a，b，李风兰a，b

2022年第11期

摘要

引用本文

摘要：研究了水灰比对密度等级为300级和500级泡沫混凝土抗压强度、导热系数和孔隙率的影响。结果表明：泡沫混凝土的密度等级不同，水灰比对其性能的影响存在差异；在水灰比为0.25时，300密度等级泡沫混凝土的抗压强度达到最大，为1.13 MPa，保温性能相对较优；随着水灰比的增加，500密度等级泡沫混凝土的导热系数不断增大，抗压强度和孔隙率不断减小，在水灰比为0.35时，其强度和保温性能达到最优；泡沫混凝土的孔隙率与抗压强度、导热系数之间存在良好的相关性。 Abstract: The effects of water-cement ratio on the compressive strength, thermal conductivity and porosity of foamed concrete with density grades of 300 and 500 were studied. The results show that the influence of water-cement ratio on the properties of foamed concrete is different due to the different density grades. When the water-cement ratio is 0.25, the compressive strength of foamed concrete with density grade of 300 reaches the maximum, which is 1.13 MPa, and the thermal insulation performance is relatively good. With the increase of water-cement ratio, the thermal conductivity of foamed concrete with density grade of 500 increases continuously, and the compressive strength and porosity decrease continuously, and when the water-cement ratio is 0.35, its strength and thermal insulation performance reach the optimum. There is a good correlation between the porosity of foamed concrete and the compressive strength and thermal conductivity.

曹星星,党钧陶,李风兰.水灰比对泡沫混凝土抗压强度和导热系数的影响[J].混凝土与水泥制品,2022(11):68-71,75. CAO X X,DANG J T,LI F L,et al.Effect of Water-cement Ratio on the Compressive Strength and Thermal Conductivity of Foamed Concrete[J].China Concrete and Cement Products,2022(11):68-71,75.

锂瓷石尾矿在蒸压加气混凝土砌块中的应用技术研究

黄高明，刘红霞，刘澜涛，王红英

2022年第11期

摘要

引用本文

摘要：采用锂瓷石尾矿等质量替代0、20%、40%、60%、80%、100%的天然砂制备了蒸压加气混凝土，研究了锂瓷石尾矿的湿磨时间和替代率以及蒸压养护制度对蒸压加气混凝土性能的影响。结果表明：未湿磨时，锂瓷石尾矿替代率为60%试件的抗压强度与表观密度比（σ/ρ）较对照组降低了19.1%，制备出的产品不合格；锂瓷石尾矿的最佳湿磨时间宜控制在20~30 min；锂瓷石尾矿越细，制备出的蒸压加气混凝土的σ/ρ值越大；在锂瓷石尾矿替代率为60%的情况下，与未湿磨相比，湿磨30 min时试件的σ/ρ值从0.13增至0.67；随着恒压时间的增加，σ/ρ值增大，恒压时间宜控制在6~8 h。工业化实际生产表明，当锂瓷石尾矿的湿磨时间为30 min、替代率为60%时，可制备出A3.5强度等级、B06密度等级的合格产品，且产品的放射性、浸出毒性等安全性指标合格。 Abstract: The autoclaved aerated concrete was prepared by replacing 0, 20%, 40%, 60%, 80%, 100% natural sand with lithium porcelain stone tailings, and the influence of wet grinding time and replacement rate of lithium porcelain stone tailings and autoclave curing method on the performance of autoclaved aerated concrete was studied. The results show that when the replacement rate of non wet grinding lithium porcelain stone tailings is 60%, the ratio of compressive strength to apparent density(σ/ρ) of the specimen is decreased by 19.1% compared with the control group, and the prepared product is unqualified. The optimum wet grinding time of lithium porcelain stone tailings should be controlled within 20~30 minutes. The finer the lithium porcelain stone tailings is, the larger the σ/ρ value is. When the replacement rate of lithium porcelain stone tailings is 60%, the σ/ρ value of the specimen after wet grinding for 30 min increases from 0.13 to 0.67 compared with the specimen without wet grinding. With the increase of constant pressure time, the σ/ρ value increases, the constant pressure time should be controlled within 6~8 h. The practical industrial production shows that when the wet grinding time of lithium porcelain stone tailings is 30 min and the replacement rate is 60%, qualified products with A3.5 strength grade and B06 density grade can be prepared, and the safety indexes such as radioactivity and leaching toxicity of the products are qualified.

黄高明,刘红霞,刘澜涛,等.锂瓷石尾矿在蒸压加气混凝土砌块中的应用技术研究[J].混凝土与水泥制品,2022(11):72-75. HUANG G M,LIU H X,LIU L T,et al.Study on Application Technology of Lithium Porcelain Stone Tailings in Autoclaved Aerated Concrete Block[J].China Concrete and Cement Products,2022(11):72-75.

改性玄武岩纤维对矿渣水泥砂浆性能的影响

罗添禄1，李泽刚2，宋杨1，曾睿1，张龙2，陈洪根1，李聪1

2022年第11期

摘要

引用本文

摘要：采用低温等离子接枝方式对玄武岩纤维（BF）进行改性处理，研究了接枝介质（水、丙烯酸、乙醇）和处理时间（10、20、30、40 min）对BF表面接触角和比表面积的影响，并研究了接枝改性BF对矿渣水泥砂浆力学性能的影响。结果表明：经过接枝改性处理后，BF的表面亲水性增强，粗糙度增大；当接枝介质为水、丙烯酸、乙醇时，试件的28 d抗压强度与空白组和掺未改性BF试件相比均变化不大，但28 d抗折强度均明显增大，其中，接枝介质为乙醇改性BF试件的28 d抗折强度最高，韧性最好，这是由于接枝改性BF与基体之间的黏结力增大所导致的。 Abstract: Basalt fiber(BF) was modified by low temperature plasma grafting method. The effects of grafting medium (water, acrylic acid, ethanol) and treatment time (10, 20, 30, 40 min) on the surface contact angle and specific surface area of BF were studied, and the effects of grafting modified BF on the mechanical properties of slag cement mortar were also studied. The results show that the surface hydrophilicity and roughness of BF are enhanced after grafting modification. When the grafting medium is water, acrylic acid and ethanol, the 28 d compressive strength of the specimen has little change compared with the blank group and the specimen mixed with unmodified BF, but the 28d flexural strength is significantly increased. Among them, the 28 d flexural strength of the specimen with the grafting medium of ethanol is the highest and the toughness is the best, which is due to the increase of the adhesion between the grafting modified BF and the matrix.

罗添禄,李泽刚,宋杨,等.改性玄武岩纤维对矿渣水泥砂浆性能的影响[J].混凝土与水泥制品,2022(11):49-53. LUO T L,LI Z G,SONG Y,et al.Effect of Modified Basalt Fiber on the Properties of Slag Cement Mortar[J].China Concrete and Cement Products,2022(11):49-53.

纳米纤维素对混凝土性能的影响研究

刘帅1，刘巧玲1，2，杨立华1，2，聂苗苗1，张姣1

2022年第11期

摘要

引用本文

摘要：研究了纳米纤维素（CNFs）对混凝土流变性能、水化热、力学性能、抗氯离子渗透性能和抗冻性能的影响，并采用扫描电子显微镜（SEM）观察了混凝土基体的微观结构。结果表明：CNFs的掺入增大了水泥浆体的屈服应力和塑性黏度，抑制了水泥的早期水化，促进了水泥的后期水化；随着CNFs掺量的增加，混凝土的抗压、抗折强度增大；CNFs的掺入改善了基体的微观结构，提高了混凝土的抗氯离子渗透性能和抗冻性能。 Abstract: The effects of nano cellulose(CNFs) on the rheology, heat of hydration, mechanical properties, resistance to chloride ion penetration and frost resistance of concrete were studied, and the microstructure of the matrix was observed by scanning electron microscope(SEM). The results show that the incorporation of CNFs increases the yield stress and plastic viscosity of cement paste, inhibits the early hydration of cement, and promotes the later hydration of cement. With the increase of CNFs content, the compressive strength and flexural strength of concrete increase. The incorporation of CNFs improves the microstructure of the matrix, so as to improve the resistance to chloride ion penetration and frost resistance of concrete.

刘帅,刘巧玲,杨立华,等.纳米纤维素对混凝土性能的影响研究[J].混凝土与水泥制品,2022(11):54-58. LIU S,LIU Q L,YANG L H,et al.Study on the Influence of Nano Cellulose on the Performance of Concrete[J].China Concrete and Cement Products,2022(11):54-58.

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