The present invention relates to a high-strength lightweight concrete composition incorporating fine rock powder, and to a high-strength lightweight concrete composition which increases the compressive strength of concrete and reduces the weight of concrete by substituting a part of cement, which is a composition component of concrete, with fine rock powder. .;High-strength lightweight concrete composition of the present invention relates to a high-strength lightweight concrete composition in which 5 to 15% by weight of the cement is replaced with mud fine powder as a binder in concrete composed of cement, fine aggregate, coarse aggregate and water. The internal structure of the concrete composition substituted with the mudstone fine powder shows that needle-like crystals are formed from the bulk cement hydrate, and the voids between the crystals are slightly reduced. Therefore, by replacing the cement in the concrete with an appropriate amount of mud fine powder, it is believed that the internal void of the concrete is reduced, thereby improving the compressive strength of the concrete. The particle size of the mudstone fine powder is 75 μm or less, which is because the smaller the particle size, the larger the void filling effect, and when the particle size is 75 μm or more, the strength of concrete decreases.;The specific gravity of mudstone powder is 2.22, which is less than the specific gravity of cement 3.15, which can reduce the weight of concrete. In addition, the coarse aggregate can be used to further reduce the unit volume weight of concrete by using artificial lightweight aggregate made by firing an aqueous rock-based expanded clay having a specific gravity of 1.19.
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