新型环氧树脂砂浆在公路工程植筋中的应用

研究目的:通过阐述环氧树脂砂浆应用的现状,针对环氧树脂固化剂等辅助材料的毒性及环氧树脂砂浆收缩引起粘结面粘结不良,对环氧树脂砂浆原材料选择、配方设计及砂浆的各种性能进行研究,得到低毒性、低收缩、高粘结强度的适用于工程植筋的环氧树脂砂浆。研究结论:(1)环氧树脂砂浆中的固化剂、其他辅剂的选择对降低其毒性至关重要,尤其是固化剂的毒性影响更大;(2)适量的水泥和砂子填料的加入会明显降低树脂的收缩性,防止植筋粘结界面的开裂;(3)新型低毒性环氧树脂砂浆一天强度20 MPa以上、三天粘结强度满足植筋设计要求,最终强度60 MPa左右、收缩率0.3%左右;(4)当光圆钢筋植入深度不小于15倍钢筋直径、螺纹钢筋植入深度不小于10倍钢筋直径时,拉拔力能够达到钢筋屈服强度,在植筋工程中有良好的应用价值。

Application of New-type Epoxy Resin Mortar in Planting Reinforcement Bar of Highway Engineering

Research purposes: The introduction was given to the current applicable situation of the epoxy resin mortar and aiming at the problem of the poor coherence of the cohering surface caused by the toxicity of the auxiliary materials like epoxy resin curing agent and the contraction of the epoxy resin,the study was done on the selection of the raw materials,formulating of recipe and the various properties of the epoxy resin mortar for the purpose of finding out the low toxic,low contracting and high cohering strength epoxy resin mortar that was available for the planting reinforcement bar. Research conclusions:(1) The selection of the curing agent and the other auxiliary agents used in the epoxy resin mortar is crucial to cutting the toxicity of the epoxy resin mortar,especially the curing agent has more impact on the toxicity of the mortar.(2) Adding the appropriate amount of cements and sands can obviously reduce the contraction of the resin to avoid the crack of the cohering surface.(3) The cohering strength of new-type low toxic epoxy resin mortar can reach at the 20 MPa for one day,the cohering strength after 3 days can meet the design requirement of planting reinforcement bar and its final strength can reach at 60 MPa with the contraction rate of about 0.3%.(4) When the planting depth of the smooth round reinforcement bar is not lees than 15 times of the reinforcement bar diameter and the planting depth of the screw thread reinforcement bar is not less than 10 times of the reinforcement bar diameter,the drawing force can yield the reinforcement bar,so it has perfect applicable value in the planting reinforcement bar engineering.