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安徽增杰浅谈高性能混凝土配合比设计原则

发布时间:2018/7/24 10:56:09 浏览次数:468

配合比设计主要考虑水胶比、砂率、橡胶用量、外加剂的种类和用量。综合考虑混凝土拌合物的可加工性、力学性能、耐久性和体积稳定性、施工期和经济效益,将水胶比、砂率、胶料用量和掺量控制在适当范围内,达到BA的效果。混凝土性能的快速发展。


安徽增杰浅谈高性能混凝土配合比设计原则


水胶比大于水胶比,有利于提高混凝土拌和物的可加工性,但会降低混凝土的强度和耐久性。根据设计强度等级的要求,最大水胶比不大于0.30,可通过使用高性能聚羧酸减水剂和添加矿物掺合料来实现低水胶比。


安徽增杰浅谈高性能混凝土配合比设计原则


砂率:高砂率可以提高混凝土的性能,但不利于混凝土强度的提高,会增加混凝土收缩开裂的可能性。为了满足施工要求,尽可能减少砂率。通过混合气体可以提高冷凝液的可操作性。砂率控制在36~39%之间。象山港大桥预制箱梁为海工混凝土。混凝土的含气量为3±1%。


安徽增杰浅谈高性能混凝土配合比设计原则


胶量和水泥用量:高掺量橡胶有利于提高拌和物的可加工性和混凝土强度,但不利于混凝土的体积稳定性和开裂。从经济效益的角度出发,在满足施工要求的前提下,应尽量少用橡胶材料。根据设计强度等级的要求,确定最小橡胶材料用量不小于460 kg/m3,用量范围为460~500 kg/m3,水泥用量为300~340 kg/m3。


安徽增杰浅谈高性能混凝土配合比设计原则


矿物掺合料的种类和用量:加入适量的活性矿物掺合料,不仅可以调节水泥颗粒的级配,而且可以改善增稠、增塑、减水的效果,改善骨料界面的作用,提高渗透性。混凝土的抗力。由于掺合料掺量过多,加速了混凝土的劣化,易引起混凝土收缩开裂,不利于混凝土耐久性的提高。矿物掺合料的控制范围为30~40%。


Mixing ratio design mainly considers water binder ratio, sand rate, rubber dosage, variety and dosage of admixture. The workability, mechanical properties, durability and volume stability, construction period and economic benefit of concrete mix are taken into account, and the water glue ratio, sand rate, the amount of glue material and the amount of admixture are controlled in the proper range to achieve the balanced development of the concrete performance.


The ratio of water to binder is larger than that of water binder ratio, which is beneficial to improving the workability of concrete mixture, but it will reduce the strength and durability of concrete. According to the requirement of the design strength grade, the maximum water binder ratio is not more than 0.30, and the low water glue ratio can be realized by using high performance polycarboxylic acid water reducing agent and adding mineral admixture.


Sand ratio: high sand rate can improve concrete performance, but it is not conducive to concrete strength, it will increase the possibility of shrinkage and cracking of concrete. In order to meet the requirements of construction, the sand rate can be reduced as much as possible. The workability of the condensate can be improved by mixing gas. The sand rate is controlled from 36 to 39%. The precast box girder of Xiangshan harbour bridge is a marine concrete. The gas content of the concrete is 3 + 1%.


The amount of glue and cement: the high dosage of rubber is beneficial to the improvement of the workability and concrete strength of the mixture, but it is not conducive to the volume stability and cracking of concrete. From the perspective of economic benefits, the rubber material should be used as little as possible under the premise of satisfying construction requirements. According to the requirement of the design strength grade, it is determined that the minimum rubber material dosage is not less than 460 kg/m3, the dosage range is 460~500 kg/m3, the cement dosage is 300~340 kg/m3..


The variety and dosage of mineral admixture: adding a proper amount of active mineral admixture can not only adjust the gradation of cement particles, but also improve the effect of thickening, plasticizing and water reducing, and can improve the effect of aggregate interface and improve the permeability resistance of concrete. It is easy to cause shrinkage and cracking of concrete due to excessive volume of admixture and accelerate deterioration of concrete, which is not conducive to durability of concrete. The range of mineral admixture is controlled at 30 to 40%.


合肥泡沫混凝土官方网站:http://www.ahzjcl.com/





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