基于竹材含水率的喷涂多功能环保材料-原竹黏结界面抗滑移性能试验研究

Experimental study on anti-slip behavior of multi-functional environmental material-bamboo interface based on moisture content of bamboo

竹材含水率是影响喷涂多功能环保材料-原竹黏结界面抗滑移性能的重要因素。设计了2组共计6个试件,获取不同含水率下原竹喷涂环保材料后直径的变化规律。为研究原竹含水率以及原竹表面处理方式对黏结性能的影响,设计了9组共计27个试件,并进行了推出试验。结果表明：喷涂环保材料1 d后,原竹直径增大至极值,随后缩小,约30 d后趋于平稳。原竹含水率越高,原竹与多功能环保材料的黏结性能越差,原竹含水率为55%～65%时二者直接脱离,原竹含水率为15%～25%时二者抗滑移承载力最大。原竹表面处理后,二者黏结性能得以改善。其中,涂刷防水胶结剂增强效果最显著,包裹钢丝网增强效果较小,增设竹栓杆或者安装竹篾有一定效果,同时进行包裹钢丝网、涂刷防水胶结剂和安装竹篾既可显著增强二者黏结性能,破坏后承载力也不会急剧下降,钢丝网还可抑制喷涂多功能环保材料开裂,是一种较可靠的构造做法。

The bamboo moisture content is an important factor affecting the anti-slip behavior of the bonded interface between multi-functional environmental materials and the bamboo. Six specimens, divided into two groups, were designed and tested to obtain the change of bamboo diameters after spraying the multi-functional environmental material under different moisture contents. Meanwhile, a total of twenty-seven specimens, which were divided into nine groups, were made and were subjected to push-out tests to study the influence of the bamboo moisture content and bamboo surface treatment methods on the bonding behavior. The results show that the diameter of the bamboo reaches its peak one day after spraying, then begins to shrink and tends to be stable after about 30 days. The bonding behavior becomes worse with the increase in the moisture content of bamboo. The interface is directly separated when the moisture content of bamboo is 55%-65%. The largest bearing capacity is observed when the moisture content of bamboo is 15%-25%. After surface treatments on the bamboo, the bonding behavior can be improved. Among the considered specimens, the efficiency of reinforcement by brushing waterproof cement is most remarkable, where wrapping steel wire mesh is generally insignificant. The additions of bamboo bolts and bamboo strips could also enhance the bonding to a certain extent. The bonding behavior is significantly enhanced by simultaneously wrapping the bamboo with steel wire mesh, brushing it with waterproof cement, and installing bamboo strips. With this method, the bearing capacity will not decline sharply after failure, and the steel wire mesh can restrain the cracking of the muhifunctional environmental protection material.