Concrete heat storage material

The present invention relates to a heat storage material of concrete, which refers to a mixture of the following materials with water to form a dry apparent density of 3200kg / m3 ~ 3300kg / m3, thermal conductivity coefficient of 2.45W / (m · K) ~ 2.60W / (m · K), the specific heat reaches 1.10kJ / (kg · ℃) ~ 1.20kJ / (kg · ℃) of the heat storage material: cementitious material is cement and fly ash, which is the total amount of 380kg / m3 ~ 400kg / m3; gravel as coarse aggregate in an amount of 1400kg / m3 ~ 1500kg / m3; nickel slag fine aggregate and iron, the total amount of 1300kg / m3 ~ 1400kg / m3; steel fiber in an amount of 100kg / m3 ~ 120kg / m3, superplasticizer in an amount of 3.0kg / m3 ~ 3.5kg / m3. The present invention has the characteristics of low cost, high performance, high safety.