纤维水泥及制品_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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纤维水泥及制品

硅灰对超高性能混凝土性能提升机理试验研究

樊俊江

2022年第9期

摘要

引用本文

摘要：研究了不同硅灰掺量对超高性能混凝土（UHPC）拌合物性能、力学性能的影响，并通过水化程度、孔结构、界面黏结强度等微观测试方法探讨了硅灰对UHPC性能的提升机理。结果表明，掺入硅灰可从微观和细观层面促进水泥水化、优化孔结构、提升钢纤维与浆体的黏结性能，从而提升UHPC的力学性能。当硅灰掺量在20%范围内时，提升效果随着硅灰掺量的增加而增大；当硅灰掺量超过20%时，硅灰的高需水量特性开始显现，使得UHPC拌合物的黏度大幅增加，不利于浇筑成型和气泡排出，使UHPC内部缺陷增多导致其抗压强度下降；硅灰在UHPC中的推荐掺量为10%~20%。 Abstract: The effects of different silica fume content on the mixture properties and mechanical properties of ultra-high performance concrete(UHPC) were studied, and the improvement mechanism of silica fume on the properties of UHPC was analyzed by micro-testing methods such as hydration degree, pore structure and interfacial bond strength. The results show that the addition of silica fume can promote the hydration of cement in UHPC, optimize the pore structure, and improve the bonding performance between steel fiber and slurry, so as to improve the mechanical properties of UHPC. The improvement effect increases with the increase of silica fume content in the range of 20%. When the silica fume content is over 20%, the characteristics of high water demand of silica fume begins to appear. The viscosity of UHPC mixture increases greatly, which is not conducive to pouring molding and pore discharge. The increase of internal defects leads to the decrease of compressive strength. The recommended content of silica fume in UHPC is 10%~20%.

樊俊江.硅灰对超高性能混凝土性能提升机理试验研究樊俊江[J].混凝土与水泥制品,2022(9):50-53,61. FAN J J.Experimental Study on Performance Improvement Mechanism of Silica Fume on Ultra-high Performance Concrete(UHPC)[J].China Concrete and Cement Products,2022(9):50-53,61.

纤维增强硅粉高性能混凝土试验研究

杨艳春1，张海红2，梁兴荣2

2022年第9期

摘要

引用本文

摘要：研究了粉煤灰掺量（15%、20%、25%）、硅粉掺量（0、2%、4%、6%、8%）和钢纤维掺量（0、0.5%、1.0%、1.5%、2.0%）对混凝土工作性、力学性能和断裂性能的影响。结果表明：粉煤灰掺量越大，混凝土的工作性越好，力学性能先提升后降低，适宜掺量为20%；随着硅粉掺量的增加，混凝土的力学性能先提升后降低，当硅粉掺量为4%时，混凝土的抗压强度最高；钢纤维的掺入使新拌混凝土的工作性降低，但能有效延缓混凝土的受压破坏进程，提高混凝土的弯曲韧性，当钢纤维掺量为1.5%时，混凝土的断裂荷载达到最大。 Abstract： The effects of fly ash content(15%, 20%, 25%), silicon powder content(0、2%、4%、6%、8%) and steel fiber content（0, 0.5%, 1.0%, 1.5%, 2.0%） on the workability, mechanical properties and fracture properties of concrete were studied. The results show that the higher the content of fly ash, the better the workability of concrete, the mechanical properties first increase and then decrease, and the appropriate content is 20%. With the increase of silicon powder content, the mechanical properties of concrete increase first and then decrease, and when the silicon powder content is 4%, the compressive strength of concrete is the highest. The addition of steel fiber reduces the workability of fresh concrete, but it can effectively delay the compression failure process of concrete and improve the bending toughness of concrete. When the content of steel fiber is 1.5%, the fracture load of concrete reaches the maximum.

杨艳春,张海红,梁兴荣.纤维增强硅粉高性能混凝土试验研究[J].混凝土与水泥制品,2022(9):54-57,61. YANG Y C,ZHANG H H,LIANG X R.Experimental Study on Fiber Reinforced High Performance Concrete with Silicon Powder[J].China Concrete and Cement Products,2022(9):54-57,61.

引气沙漠砂纤维混凝土力学性能研究

吕胜辉1，沙吾列提·拜开依1，2，徐俊辉3

2022年第9期

摘要

引用本文

摘要：通过正交试验研究了引气剂(十二烷基磺酸钠)、短切玄武岩纤维（BF）和沙漠砂对混凝土抗压强度、劈裂抗拉强度和抗折强度的影响。结果表明，引气沙漠砂纤维混凝土的最优配合比为引气剂掺量0.003%、沙漠砂替代率40%、短切BF掺量0.1%。 Abstract: The effects of air entraining agent (sodium dodecyl sulfonate), chopped basalt fiber (BF) and desert sand on the compressive strength, splitting tensile strength and flexural strength of concrete were studied by orthogonal tests. The results show that the optimal mix proportion of air entraining fiber reinforced concrete with desert sand is as follows: the air entraining agent content is 0.003%, the replacement rate of desert sand is 40%, and the chopped BF content is 0.1%.

吕胜辉,沙吾列提·拜开依,徐俊辉.引气沙漠砂纤维混凝土力学性能研究[J].混凝土与水泥制品,2022(9):58-61. LYU S H,BEKEY·S,XU J H.Study on Mechanical Properties of Air Entraining Fiber Reinforced Concrete with Desert Sand[J].China Concrete and Cement Products,2022(9):58-61.

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