砂土中混凝土裂缝的微生物封堵试验研究

Experimental study of microbial clogging of concrete cracks in sand

微生物封堵技术研究表明可以通过向岩土中微生物提供营养物质从而在较短时间形成封堵。该文对砂土中混凝土裂缝利用微生物封堵法进行试验,设置两个试验组灌入不同的营养物质,分别记录试验过程中的环境温度和湿度,对流出液的pH值、电导率、氧化还原电位、OD600及不同种类微生物数量变化进行了检测。结果表明:在灌入不同营养物质25d后,试块均发生较明显的封堵现象,单位时间内的流量有了显著降低,其中一个灌注马铃薯提取物的试验模型由平均85mL/h下降至0.5mL/h,另一个灌注加铁的马铃薯提取物的试验模型由平均70mL/h下降至0.3mL/h。研究结果证实了微生物代谢在砂土中混凝土裂缝封堵过程中发挥了重要作用。

Studies on microbial clogging techniques have shown that the provision of sufficient suitable nutrients for the microorganisms in geotechnical soils can produce effective microbial clogging in relatively short periods of time.This study applied various nutrients to two sand columns each with a cracked concrete slab.The tests recorded the ambient temperature and humidity,the pH,electrical conductivity,redox potential,OD600 and the number of different microorganisms.Blocking occurred after various nutrients had been supplied for 25 days.The flow per unit time was significantly reduced with one test slab with potato exact dropping from an average of 85 mL/h to 0.5 mL/h and the other test slab with potatoexact and Fe dropping from an average of 70 mL/h to 0.3 mL/h.The tests show that microbial metabolism plays an important role in concrete crack sealing in sand.