摘   要：研究了聚甲醛（POM）纤维的形状（圆柱状、扁平状）、长度（8 mm、12 mm）和掺量（0.8、1.2、1.6、2.0 kg/m3）对自密实混凝土（SCC）工作性和力学性能的影响。结果表明：POM纤维对SCC工作性的影响较小；随着POM纤维的掺量从0.8 kg/m3增至2.0 kg/m3，SCC的坍落扩展度、抗压强度和轴压强度均呈先升高后降低的趋势，T50先降低后升高，抗折强度、轴拉强度和弹性模量均呈逐渐增大的趋势；总体上，当POM纤维掺量为1.2 kg/m3时，对SCC工作性和力学性能的提升效果最好；与扁平状POM纤维相比，圆柱状POM纤维相对更适合掺入SCC中；考虑SCC工作性、抗压强度和轴压强度时，建议掺入8 mm长圆柱状POM纤维；考虑SCC轴拉强度和弹性模量时，建议掺入12 mm长圆柱状POM纤维。Abstract: The influence of the shape (cylindrical, flat), length (8 mm, 12 mm), and content (0.8, 1.2, 1.6, 2.0 kg/m3) of polyoxymethylene (POM) fiber on the workability and mechanical properties of self-compacting concrete (SCC) was studied. The results indicate that POM fiber has a relatively small impact on the workability of SCC. With the increase of POM fiber content from 0.8 kg/m3 to 2.0 kg/m3, the slump expansion, compressive strength and axial compressive strength of SCC increase first and then decrease, T50 decreases first and then increases, while the flexural strength, axial tensile strength, and elastic modulus all show a gradually increasing trend. Overall, when the POM fiber content is 1.2 kg/m3, the improvement effect of POM fiber on the workability and mechanical properties of SCC is the best. Compared with flat POM fiber, cylindrical POM fiber is relatively more suitable for incorporation into SCC. When considering the workability, compressive strength, and axial compressive strength of SCC, it is recommended to incorporate cylindrical POM fiber with length of 8 mm. When considering the axial tensile strength and elastic modulus of SCC, it is recommended to incorporate cylindrical POM fiber with length of 12 mm.

贺晶晶,卢浩丹,王攀菲,等.聚甲醛（POM）纤维自密实混凝土（SCC）工作性和力学性能研究[J].混凝土与水泥制品,2026(1):37-42. HE J J,LU H D,WANG P F,et al.Study on workability and mechanical properties of polyoxymethylene (POM) fiber reinforced self-compacting concrete (SCC)[J].China Concrete and Cement Products,2026(1):37-42.

摘   要：通过模拟我国西部盐渍土真实环境，设计了复盐（氯盐与硫酸盐）干湿循环-高低温循环-冻融循环耦合劣化循环制度，并在室内开展了混凝土耐久性能加速试验，研究了玄武岩纤维（BF）掺量（0、0.05%、0.10%、0.20%）和耦合劣化循环次数（0、1、2、3、4、5次）对混凝土质量损失率、相对动弹性模量、饱和面干吸水率、孔结构、力学性能和微观结构的影响，并分析了劣化机理。结果表明：随着耦合劣化循环次数的增加，玄武岩纤维混凝土（BFRC）的质量损失率增大，相对动弹性模量降低，饱和面干吸水率先下降后上升；掺入适量BF可显著提高混凝土的力学性能，当BF掺量为0.10%时，耦合劣化循环5次后BFRC的抗压强度损失率和劈裂抗拉强度损失率均小于其他组；与未掺BF的混凝土相比，掺BF的混凝土具有更低的孔隙率；掺入适量BF可有效抑制混凝土内部微裂缝的扩张，减缓侵蚀产物的扩散速率。Abstract: By simulating the real environment of saline soil in western China, a coupling deterioration cycle mechanism of dry-wet cycle, high and low temperature cycle, and freeze-thaw cycle of composite salt (chloride and sulfate) was designed. Accelerated durability tests of concrete were conducted indoors, and the effects of basalt fiber (BF) content (0, 0.05%, 0.10%, 0.20%) and coupling deterioration cycle times (0, 1, 2, 3, 4, 5 times) on mass loss rate, relative dynamic elastic modulus, saturated surface dry water absorption rate, pore structure, mechanical properties, and microstructure of concrete were studied, and the deterioration mechanism was analyzed. The results show that with the increase of coupling degradation cycle times, the mass loss rate of basalt fiber reinforced concrete (BFRC) increases, the relative dynamic elastic modulus decreases, and the saturated surface dry water absorption first decreases and then increases. Adding an appropriate content of BF can significantly improve the mechanical properties of concrete. When the BF content is 0.10%, the compressive strength loss rate and splitting tensile strength loss rate of BFRC after 5 times of coupling degradation cycle are lower than those of other groups. Compared with concrete without BF, concrete with BF has a lower porosity. Adding an appropriate content of BF can effectively suppress the expansion of microcracks inside concrete and slow down the diffusion rate of erosion products.

孙强,王成亚.盐渍土环境下玄武岩纤维混凝土（BFRC）的性能劣化规律与机理研究[J].混凝土与水泥制品,2026(1):29-36. SUN Q,WANG C Y.Study on the deterioration law and mechanism of performance of basalt fiber reinforced concrete (BFRC) in saline soil environment[J].China Concrete and Cement Products,2026(1):29-36.