房建材料及制品_2023_《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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房建材料及制品

微孔混凝土及其复合墙体的耐高温性能研究

曹万智，高潇，代佳，张笑笑，叶骐瑞，韩广兴，迟骋

2023年第5期

摘要

引用本文

摘要：采用料浆容重法进行了配合比设计，分别制备了表观密度为 600、800、1 000、1 200 kg/m3 的微孔混凝土，并制作了微孔混凝土-XPS-微孔混凝土复合墙体试块，通过立方体试块高温试验和复合墙体单面受热试验，研究了表观密度和结构形式对微孔混凝土复合墙体试块的耐高温性能的影响。结果表明：随着温度的提高，微孔混凝土的质量损失增加，抗压强度和导热系数降低，表观密度对微孔混凝土的耐高温性能影响较大；表观密度越高，微孔混凝土复合墙体的耐高温性能越好，25 -50-25 mm厚的复合墙体的隔热性能最好。 Abstract: The slurry bulk density method was used to design the mix proportion, and the microporous concrete with apparent density of 600, 800, 1 000 and 1 200 kg/m3 was prepared, the test blocks of microporous concrete-XPS- microporous concrete composite wall was prepared, and the effect of the apparent density and structural form on the high temperature resistance of microporous concrete composite wall was studied by high temperature test of cube specimens and single side heating test of composite walls. The results show that with the increase of temperature, the mass loss of microporous concrete increases, and the compressive strength and thermal conductivity decrease. The apparent density has a significant influence on the high temperature resistance of microporous concrete. With the increase of apparent density, the high temperature resistance of the microporous concrete composite wall increases, and the protective layer of 25 mm thick microporous concrete has the best insulation effect on the corl material.

曹万智,高潇,代佳,等.微孔混凝土及其复合墙体的耐高温性能研究[J].混凝土与水泥制品,2023(5):59-62,73. CAO W Z,GAO X,DAI J,et al.Study on the High Temperature Resistance of Micropoprous Concrete and Its Composite Walls[J].China Concrete and Cement Product,2023(5):59-62,73.

聚合物乳液对水泥砂浆性能影响的研究

王克凡1，龙天艳2，王娟2，周志云1

2023年第5期

摘要

引用本文

摘要：为研究不同聚合物乳液对水泥砂浆的改性效果，将苯丙乳液（SA乳液）、醋酸乙烯-乙烯共聚乳液（VAE乳液）和丁苯乳液（SB乳液）单掺或复掺到砂浆中，并测试了试件的拉伸粘结强度、抗压强度、抗折强度。结果表明：单掺SA乳液和单掺VAE乳液均能提高试件的拉伸粘结强度，但随着聚灰比的增加，单掺VAE乳液时的试件拉伸粘结强度逐渐降低，单掺SA乳液时的试件拉伸粘结强度逐渐升高；复掺乳液对试件拉伸粘结强度的改善作用由大到小依次是SB-SA复配乳液、SB-VAE复配乳液、SA-VAE复配乳液；相同SB乳液掺量下，SA乳液和VAE乳液的掺入分别对试件的拉伸粘结强度、抗压强度的提升效果较好；当mVAE∶mSB为1∶1时，二者可发挥协同作用，进一步提高了试件的拉伸粘结强度和抗压强度。 Abstract: In order to study the modification effects of different polymers on mortar, styrene-acrylic emulsion(SA), vinyl acetate ethylene copolymerization emulsion(VAE) and styrene-butadiene emulsion(SB) were added to the mortar by single or compound. The tensile bond strength, compressive strength, flexural strength were tested. The results show that the tensile bond strength of mortar can be improved with the addition VAE or SA single. With the increase of the ratio of polymer to cement, the tensile bond strength of mortar with single-mixing of VAE gradually decreases, the strength of mortar with single-mixing of SA gradually increases. The improvement effect of mixed emulsion on the tensile bond strength of mortar are in descending order: SB-SA, SB-VAE, SA-VAE. Under the same dosage of SB, the incorporation of SA can improves the tensile bond strength of mortar, and the incorporation of VAE can improve the compressive strength of mortar better. When mVAE∶mSB is 1∶1, it has a synergistic role to further improve the tensile bond strength and compressive strength.

王克凡,龙天艳,王娟,等.聚合物乳液对水泥砂浆性能影响的研究[J].混凝土与水泥制品,2023(5):63-67. WANG K F,LONG T Y,WANG J,et al.Study on the Effect of Polymer Emulsion on the Properties of Cement Mortar[J].China Concrete and Cement Product,2023(5):63-67.

新型夹芯保温叠合楼板的传热机理及热工性能研究

贺庆澳1,2，张明山1,3，李本悦3，邓华2，徐铨彪1,3

2023年第5期

摘要

引用本文

摘要：将保温层置于混凝土叠合楼板的预制底板和现浇顶板之间，提出了一种新型夹芯保温叠合楼板（以下简称新型叠合板），建立了稳态传热分析有限元模型，研究了桁架钢筋间距、夹芯层厚度等对新型叠合板传热系数的影响。结果表明：为满足规范传热要求，夹芯层厚度需超过20 mm、材料导热系数需小于0.15 W/(m·K)；新型叠合板热桥效应明显，桁架钢筋对结构传热系数影响可达13.5%；随着夹芯层保温效果的提高，桁架钢筋间距造成的热阻变化占整体热阻的比例逐渐提高，但占钢筋总影响的比例降低。此外，通过对样本模型数据进行回归分析，得到了具有较高精度的传热系数计算公式，可以用来评估此类新型叠合板的保温性能。 Abstract: A new type of sandwich thermal insulation composite floor slabs was proposed, in which the thermal insulation layer was placed between the precast bottom plate and the cast-in-place top plate of reinforced concrete composite floor slabs. The effects of parameters, such as the spacing between the truss bars and the thickness of the sandwich layer, on the thermal transmittance of the sandwich thermal insulation composite floor slabs were investigated. The results show that, the thickness of sandwich layer should exceed 20 mm, and the thermal conductivity of the material should be less than 0.15 W/(m·K) to meet the heat transfer requirements of the specification. The thermal bridge effect of the sandwich thermal insulation composite floor slabs is obvious, with an impact on the thermal transmittance of the structure up to 13.5%. With the improvement of insulation effect of sandwich layer, the proportion of thermal resistance variation caused by the change of truss spacing to the overall thermal resistance gradually increases, but its proportion to the total influence of truss bars decreases. In addition, a new formula for calculating the thermal transmittance with high accuracy is obtained through the regression analysis of the sample model data, which can quickly evaluate the thermal insulation performance of this new type of composite floor slabs.

贺庆澳,张明山,李本悦,等.新型夹芯保温叠合楼板的传热机理及热工性能研究[J].混凝土与水泥制品,2023(5):68-73. HE Q A,ZHANG M S,LI B Y,et al.Research on the Heat Transfer Mechanism and Thermal Performance of Sandwich Thermal Insulation Composite Floor Slabs[J].China Concrete and Cement Product,2023(5):68-73.

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