模拟酸雨环境下掺锂渣钢筋混凝土梁抗弯性能试验研究

EXPERIMENTAL RESEARCH ON FLEXURAL BEHAVIOR OF REINFORCED CONCRETE BEAMS MIXED WITH LITHIUM SLAG IN SIMULATED ACID ENVIRONMENT

为揭示酸雨环境下掺锂渣混凝土梁抗弯性能的退化规律,制作了5根掺锂渣混凝土梁和5根普通混凝土梁,配制了模拟酸雨溶液对试验梁进行循环喷淋,模拟酸雨环境加速腐蚀。试验梁达到预定腐蚀时间后,测定混凝土的腐蚀损伤深度,进行梁的抗弯性能试验,提出了腐蚀钢筋混凝土梁的抗弯承载力计算式。研究表明：掺入锂渣在一定程度上提高了混凝土的耐酸雨侵蚀能力,但从长期看来,其提高作用有限;随着腐蚀程度的增加,掺锂渣混凝土梁和普通混凝土梁的极限承载力和开裂弯矩都有较明显的降低。

In order to reveal the deterioration of flexural behavior of reinforced concrete beams mixed with Lithium slag in acid rain environment,5 reinforced concrete beams mixed with lithium slag and 5 ordinary reinforced concrete beams were designed to be exposed in the simulated acid rain environment,with the accelerating corrosion method of circulating spray. The corrosion depth of the concrete was measured after a certain time of corrosion. The flexural behavior test was carried out,and the calculation formula of flexural bearing capacity of corroded reinforced concrete beam was proposed. The results showed that the addition of lithium slag could improve the corrosion resistance performance of concrete in acid rain environment. However,its improvement would be limited in the long term. With the increase of the degree of corrosion,the cracking moment and ultimate bearing capacity of two types of beams had apparent decline.