Studies of light backscattering at concrete during its hydration

Abstract

In this work we have studied, both theoretically and experimentally, changes in the integral reflection coefficient of concrete during its hydration. A diffuse approximation method has been used for description of light scattering at concrete during its hydration and the results have been compared with the experimental data obtained. The optical diagnostics technqiue introduced by us allows performing diagnostics of earlier hydration stages in the concrete hardening process and predicting mechanical properties of the concrete produced.

Light absorptions of concrete during its hydration

“…Using particles sizes dependences vs. porosity (19) and formulas (3)- (15), for distribution, showed on Fig.2.b, we received dependences of diffuse reflective coefficient vs. porosity for dry ( Fig. 7.a) and moist ( Fig.…”

Optical correlation technique for cement particle size measurements

“…In the scheme of Fig. 2, transverse displacement ρ is accompanied by longitudinal one, ρ || , determined from the equation: (10) ------------------1…”

“…As is known, optical properties are mathematically calculated only for spherical, cylindrical and spheroid forms [8,9]. For practical use, in calculations of specific cement optical properties, it is convenient to approximate particles by spherical form [10]. This approximation is used in laser radiation diffraction method [5].…”

Cement hydration investigation by method of piezoelectric photoacoustics

“…According to the model [23], U max depends on absorption coefficient. It is easy to measure this using the experimental setup shown in Fig.…”