掺吸水树脂混凝土搅拌制度优化及饱水程度的研究

发布时间：2018-05-30 22:25

本文选题：混凝土 + 吸水树脂　；参考：《哈尔滨工业大学》2017年硕士论文

【摘要】：本文为提高吸水树脂在混凝土中的分散度和更好发挥自养护作用,优化了掺吸水树脂混凝土的搅拌制度。研究吸水树脂的粒径、掺量、预吸水量对混凝土抗冻性能和水饱和度的影响。搅拌制度对掺吸水树脂混凝土比不掺吸水树脂混凝土影响显著。搅拌制度对不掺吸水树脂混凝土性能影响不大,搅拌制度二(部分水先拌砂石、后加水泥的搅拌方式)比常规搅拌可以获得性能更优的混凝土。0.1%、0.2%和0.4%掺量吸水树脂的混凝土抗冻性均有提升作用,其中0.4%掺量混凝土的抗冻性大幅提高。但是混凝土28d抗压强度降低10%以上。在冻融循环过程中,0.4%掺量吸水树脂的混凝土水饱和度也比较低。6次冻融循环后,混凝土的渗水深度都明显提高,甚至能够完全渗透混凝土。在45μm、59μm~75μm和96~150μm三种粒径中,掺96μm~150μm吸水树脂混凝土的冻融水饱和度略低,相对动弹性模量下降速度也变慢。同时掺吸水树脂混凝土的28d抗压强度都提高6%~12%。6次冻融循环后,混凝土的渗水深度随吸水树脂粒径的增大而增大。与空白组相比,吸水树脂吸30%和50%拌合水的混凝土28d抗压强度提高11%~13%。吸水树脂的吸水量对混凝土抗冻性和水饱和度影响不大。在一定程度上,较大掺量和粒径吸水树脂对混凝土抗冻性提高较大,但掺量较大时混凝土强度降低,可以采用降低水灰比和加减水剂等方法补偿强度的降低。
[Abstract]:In order to improve the dispersity of absorbent resin in concrete and to give full play to self-curing effect, the mixing system of concrete with absorbent resin was optimized in this paper. The effects of particle size, content of water absorbent and preabsorbent on the frost resistance and water saturation of concrete were studied. The mixing system has a significant effect on the concrete with absorbent resin as compared with the concrete without water absorbent. The mixing system has little effect on the performance of concrete without absorbent resin. The concrete with better performance can be obtained by adding cement after mixing. The frost resistance of concrete with 0.2% and 0.4% water absorbent resin can be improved, and the frost resistance of concrete with 0.4% concrete is greatly improved. However, the compressive strength of concrete decreased by more than 10% in 28 days. During freeze-thaw cycle, the water saturation of concrete with 0.4% water absorbent resin is also lower than that of concrete by freezing and thawing cycle, and the seepage depth of concrete can be improved obviously, even the concrete can penetrate completely. The freezing and thawing water saturation of the resin concrete mixed with 96 渭 m or 150 渭 m absorbent resin is slightly lower and the relative dynamic modulus of elasticity decreases slowly in the three particle sizes of 45 渭 m ~ 59 渭 m ~ (75 渭 m) and 96 渭 m ~ 150 渭 m. At the same time, the compressive strength of concrete mixed with absorbent resin for 28 days is increased by 6% 12.6 cycles, and the depth of seepage increases with the increase of the particle size of absorbent resin. Compared with the blank group, the compressive strength of the concrete mixed with 30% and 50% water absorbent resin for 28 days was increased by 11% and 13% respectively. The amount of absorbent resin has little effect on the frost resistance and water saturation of concrete. To a certain extent, the freezing resistance of concrete is greatly improved by larger content and particle size of water-absorbent resin, but the strength of concrete decreases when the content is larger, so the decrease of strength can be compensated by reducing water-cement ratio and adding water-reducing agent.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU528

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