Open porosity of cement pastes and their gas permeability
نویسندگان
چکیده
منابع مشابه
Influence of alkalis on porosity percolation in hydrating cement pastes
Loss-on-ignition (LOI) measurements and low temperature calorimetry (LTC) are used to study the properties of hydrating cement pastes with various quantities of alkalis. In addition to the well-known acceleration of early age hydration and ‘‘retardation’’ of later age hydration, the alkalis are observed to have a significant effect on the percolation of the porosity in the hydrating systems, as...
متن کاملPorosity and Pore Size Distribution of Well Hydrated Cement-Fly Ash-Gypsum Pastes
This research is a part of a wide range investigation on the use of flue gas desulphurisation (FGD) in construction applications. It reports some results on the porosity and pore size distribution of cement paste containing varying amounts of fly ash-gypsum blends as partial replacement of cement. The cement was replaced with 25% of different blends of fly ash and gypsum. The gypsum content ran...
متن کاملCapillary Porosity Depercolation/Repercolation in Hydrating Cement Pastes Via Low-Temperature Calorimetry Measurements and CEMHYD3D Modeling
Capillary porosity percolation in a hydrating cement paste has a large influence on transport properties and durability. Percolation can be examined using low-temperature calorimetry and using microstructure models. In this paper, the two approaches are compared for cement pastes with different water-to-cement ratios and exposed to various curing conditions. The influence of sealed curing is se...
متن کاملEstimating the permeability of cement pastes and mortars using image analysis
8 A method to estimate permeability of cement-based materials using pore areas and perimeters from SEM images 9 is presented. The pore structure is idealised as a cubic lattice having pores of arbitrary size. The hydraulic con10 ductance of each pore is calculated using the hydraulic radius approximation, and a stereological factor is applied 11 to account for the random orientation of the imag...
متن کاملStructural studies on hydrating cement pastes
The development of the mesoscopic material structure during the hydration of ordinary Portland cement paste is studied by small-angle neutron scattering. Results on the time dependence of radii of gyration (Guinier region) and exponents (Porod region) are given and discussed. Introduction Building materials like hardened cement are heterogeneous. Their useful properties (as strength, porosity, ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Bulletin of the Polish Academy of Sciences Technical Sciences
سال: 2016
ISSN: 2300-1917
DOI: 10.1515/bpasts-2016-0086