Energy-saving and environment-friendly non-autoclaved pipe pile concrete material with high impact resistance and preparation method thereof

An energy-saving and environment-friendly non-autoclaved pipe pile concrete with high impact resistance, raw materials of the concrete comprising a cementing material, sand and gravels, modified rubber fiber, water reducer and water;

• wherein the cementing material comprises Portland cement and admixture;
• a content of the cementing material in the concrete is 400-500 kg/m3;
• the admixture comprises slag powder and silicon powder, a specific surface area of the slag powder is 400-450 m2/kg, a specific surface area of the silicon powder is 15-30 m2/kg, a content ratio of the slag power to the whole cementing material is 25-40% by mass, and a content ratio of the silicon power to the whole cementing material is 5-10% by mass;
• a content of the sand and gravels in the concrete is 1784 kg/m3-1925 kg/m3, where a sand content of the sand and gravels is 31.6%-36.6%;
• a content ratio of the water reducer to the whole cementing material is 1.0-1.5% by mass;
• rubber fiber is obtained by mechanically cutting a waste rubber tire, the rubber fiber has a length-diameter ratio of 2-10, a diameter of 2 mm-10 mm, and a tensile strength of 20-25 MPa;
• the modified rubber fiber is added to replace the sand and gravels of an equal volume in aggregate, with a replacement rate of 5-20%;
• and the modified rubber fiber is obtained by making the rubber fiber undergo shadow carbonization and soaking the obtained rubber fiber with a modifier;
• a water-cement ratio is 0.19-0.22;
• the modified rubber fiber is prepared by a method including following steps:
• (1) weighing a certain amount of rubber fiber, soaking the rubber fiber with in clear water to wash off impurities and additives on a surface of the rubber fiber, filtering and drying the rubber fiber;
• (2) placing the dried rubber fiber into a vacuum tube type atmosphere furnace, introducing nitrogen to replace air within the furnace, rapidly raising a temperature to 300-400 degrees Celsius, and keeping the temperature for 10-30 min, then collecting, after cooling, the rubber fiber after shallow carbonization;
• and
• (3) placing the rubber fiber after shallow carbonization into a prepared modifier material for soaking for a certain time, and collecting, after post-processing, the rubber fiber after secondary modification, that is, the modified rubber fiber;
• the shallow carbonization means that a carbonization depth is 1/6-1/5 of a radius from the surface to a center of the rubber fiber;
• and
• the modifier is one or more selected from NaOH, methanol, silane coupling agent and styrene-butadiene latex;
• and a time for the soaking is 12-24 h.