Cement-based water permeable brick with cementing strength being improved by aluminum dihydrogen phosphate and lithium ore slag synergistically

The invention discloses a cement-based water permeable brick with the cementing strength being improved by aluminum dihydrogen phosphate and lithium ore slag synergistically. The brick is prepared from the following raw materials in parts by weight: 40 to 43 parts of granite corner waste, 30 to 32 parts of waste concrete, 20 to 22 parts of 42.5-grade ordinary Portland cement, 2 to 2.5 parts of polyester-cotton fabric leftover materials, 0.1 to 0.12 part of epicholorohydrin-dimethylamine polymer, 0.3 to 0.4 part of an early-strength type polycarboxylate superplasticizer, a proper amount of water, 2 to 3 parts of lignin-based hydramine, 1 to 1.5 parts of aluminum dihydrogen phosphate, 7 to 8 parts of the lithium ore slag and 1.5 to 2.5 parts of gelatin. The brick adopts the energy-saving and environment-friendly raw materials, the production cost is lowered, the compressive strength and the permeation coefficient are good, and the brick is applicable to paving of urban road surfaces, is capable of fast absorbin