Low-alkali ecological porous concrete and preparation method thereof

The invention relates to the technical field of concrete, and discloses low-alkali ecological porous concrete and a preparation method thereof. The ecological porous concrete is prepared from the following raw materials in parts by mass: 70 to 80 parts of gravel coarse aggregate, 17 to 22 parts of cement, 1 to 2 parts of diatomite, 0.1 to 0.3 part of oxalic acid, 0.1 to 0.3 part of ferric sulfate, 0.01 to 0.03 part of water reducing agent and 4 to 6 parts of water, the pH value of a 28d pore aqueous solution of the obtained low-alkali ecological porous concrete is 9.0 or below, the 7d cubic compressive strength reaches 7-10 MPa, the 28d cubic compressive strength reaches 10-15 MPa, and the porosity is 25%-30%. The ecological porous concrete is simple in formula and low in cost, the lowest pH value of 28d is 8.79, the low alkalinity and the porous structure can retain water, ventilate and supply oxygen, the germination rate of plant seeds can be increased, the environment requirement for normal growth of plant