▎ 摘　　要

NOVELTY - Manufacture of sidewalk block involves preparing (i) a high-strength artificial aggregate comprising cement, waste dust, titanium dioxide mixture comprising anatase titanium dioxide and/or rutile titanium dioxide, graphene and high-performance water reducing agent, preparing (ii) a base layer mixture by mixing cement, aggregate, steel slag aggregate, high-performance water reducing agent and activated silica, preparing (iii) a surface layer mixture by mixing white cement, high-strength artificial aggregate, steel slag aggregate, titanium dioxide, dolomite, polymer powder comprising vinyl acetate and phenoxyethanol ethylene glycol monophenyl ether, and high-performance water reducing agent, injecting (iv) the base layer mixture into a mold to form a base layer, applying (v) the surface layer mixture on the base layer to form a surface layer, and pressing (vi) and curing the surface layer. USE - Manufacture of sidewalk block (claimed). ADVANTAGE - The method enables manufacture of sidewalk block having improved nitrogen oxide reduction performance, surface strength and abrasion resistance, and suppressed generation of cracks and damage from surface scratches caused by the movement of pedestrians and vehicles. The sidewalk block has excellent decomposition and removal ability of nitrogen oxide and sulfur oxide, which are major causative substances of air pollution and fine dust by photochemical reaction of titanium dioxide, such that large amount of fine dust and harmful components can be quickly purified. DETAILED DESCRIPTION - Manufacture of sidewalk block involves preparing (i) a high-strength artificial aggregate comprising 100 pts. wt. cement, 100-200 pts. wt. waste dust, 5-20 pts. wt. titanium dioxide mixture comprising anatase titanium dioxide and/or rutile titanium dioxide, 0.002-0.005 pt. wt. graphene and 1-2 pts. wt. high-performance water reducing agent and crushing to a predetermined size, preparing (ii) a base layer mixture by mixing 100 pts. wt. cement, 50-150 pts. wt. aggregate, 100-200 pts. wt. steel slag aggregate, 0.5-1 pt. wt. high-performance water reducing agent and 1-10 pts. wt. activated silica, preparing (iii) a surface layer mixture by mixing 100 pts. wt. white cement, 100-200 pts. wt. high-strength artificial aggregate, 50-100 pts. wt. steel slag aggregate, 1-5 pts. wt. titanium dioxide, 200-300 pts. wt. dolomite, 0.5-5 pts. wt. polymer powder comprising vinyl acetate and phenoxyethanol ethylene glycol monophenyl ether, and 0.1-1 pt. wt. high-performance water reducing agent, injecting (iv) the base layer mixture in a predetermined thickness into a mold to form a base layer, applying (v) the surface layer mixture to a predetermined thickness on the base layer to form a surface layer, and pressing (vi) and curing the surface layer. Waste dust in the artificial aggregate is generated during classification of particles or steel slag aggregates generated during crushing process in recycle process of steel slag which is a by-product generated during steel production process. Waste dust increases the recycling rate of waste resources which are industrial by-products generated during the process. The high-strength artificial aggregate is used for the surface layer, and titanium dioxide inappropriate only by the use of the high-strength artificial aggregate is used in the surface layer mixture to improve nitrogen oxide reduction performance. In the process (ii), activated silica comprises 90% or more silicate, and continuously reacts with cement to reinforce cement matrix of the base layer. The polymer powder improves surface strength by improving bonding strength between aggregates.