High-strength concretes based on anthropogenic raw materials for earthquake resistant high-rise construction

Abstract

This work is devoted to development of optimum recipes of high-strength concretes based on filled binders with fine-milled anthropogenic mineral filler intended for earthquake resistant high-rise monolithic construction. The optimum recipes of concretes in this work have been developed on the basis of computations and experimental designing of cast concrete mixes with chemical additives and anthropogenic mineral fillers, as well as destructive inspection methods as the most precise for analysis of physicomechanical and deformation properties of concrete. The following raw materials have been used for production of high-strength concretes: natural quartz sands with the fineness modulus F.M. = 1.7-1.8; crushed limestone with the particles sizes of 5-20 mm; water reducing chemical additives and hardening retarder to control specifications of concrete mixes; plain Portland cement, grade PTs 500 D0; anthropogenic mineral additives (fillers) in the form of crushed concrete and ceramic bricks. Optimum recipes of monolithic concretes have been designed using anthropogenic raw materials including normal concrete grades with compressive strength of M30-M40 and high-strength concrete grades of M50-M80, characterized by high homogeneity of cement stone with significantly finer pores and lower shrinkage. Herewith, it has been established that fine-milled anthropogenic mineral filler in the form of crushed concrete and ceramic bricks at the ratio of 70:30, respectively, efficiently influences specifications of concrete mixes on their basis significantly increasing resistance of the mix against sedimentation and water gain. It has been established that the developed high-strength concretes based on filled binders with fine-milled anthropogenic mineral filler are characterized by high freeze–thaw resistance (from F400 to F600) and water tightness (W14 and higher), which is a solid base providing high lifecycle of such concretes.

Electrochemical Seismic Design and Artificial Intelligence System Modeling of High-Rise Steel Structure Buildings

“…With the optimization and development of architectural design, the steel structure applied in high-rise buildings is also developed [3]. A mathematical model of the structure of high-rise buildings is established, and the numerical simulation of each structural material under the action of earthquake energy waves is analyzed.…”

A Study on the Cement Gel Formation Process during the Creation of Nanomodified High-Performance Concrete Based on Nanosilica

“…It has been established that the physical and mechanical properties of cement stone and concrete as a whole are affected by the ratio between the crystalline and gel-like phases, as well as the presence of ultrafine filler, including nanoparticles. With the optimal ratio between the gel-like and crystalline components of the composite mass, a denser packing of filler grains is provided [ 52 ].…”

The Investigation of Compacting Cement Systems for Studying the Fundamental Process of Cement Gel Formation

“…Neoplasms first “appear on the surface of cement grains. With an increase in the number of new formations and their packing density, the boundary layer becomes less permeable to water for approximately 2–6 h” [ 37 , 38 ].…”

“…The inner layers of cement grains, reacting with water, tend to expand. As a result, the destruction of the gel shells occurs, the access of water deep into the cement grains is facilitated, and the process of cement hydration is accelerated [ 37 , 38 ].…”