Determining the water–cement ratio, cement content, water content and degree of hydration of hardened cement paste: Method development and validation on paste samples

2009 ◽  
Vol 39 (10) ◽  
pp. 957-965 ◽  
Author(s):  
H.S. Wong ◽  
N.R. Buenfeld
Keyword(s):  
Water Content ◽  
Cement Paste ◽  
Method Development ◽  
Cement Content ◽  
Hardened Cement ◽  
Hardened Cement Paste ◽  
Cement Ratio ◽  
Degree Of Hydration ◽  
Method Development And Validation ◽  
Development And Validation

Influence of Water Content in the Hardened Cement Paste Mixtures with Different Proportion of Fly Ash on the Material and Mechanical Properties

2013 ◽  
Vol 486 ◽  
pp. 319-322
Author(s):  
Ondřej Zobal ◽  
Pavel Padevět
Keyword(s):  
Fly Ash ◽  
Water Content ◽  
Cement Paste ◽  
Volume Density ◽  
Hardened Cement ◽  
Average Amount ◽  
Hardened Cement Paste ◽  
The Czech Republic ◽  
Influence Of Water ◽  
Current Standards

Above average amount of fly ash production in the Czech Republic compels us to process it. Part of this waste material has some potential for use in various industries. The largest part is used in construction. One option is the use of larger replacement of cement with fly ash than as required by current standards. This paper is dedicated to the cement paste with different fly ash cement replacement. Specifically, are observed properties of hardened mixtures depending on the water content. There are presented the results of measurements of volume density and compressive strength.

Quantitative Characterization of Effective Porosity in Cement-Based Composite Materials

2010 ◽  
Vol 163-167 ◽  
pp. 3174-3179
Author(s):  
Guo Wen Sun ◽  
Jin Yang Jiang ◽  
Yun Sheng Zhang ◽  
Cai Hui Wang
Keyword(s):  
Composite Materials ◽  
Cement Paste ◽  
Pore Diameter ◽  
Effective Porosity ◽  
Hardened Cement ◽  
Hardened Cement Paste ◽  
Pore Characteristics ◽  
Cement Ratio ◽  
Water To Cement Ratio ◽  
Second Peak

The method of the second intrusion mercury in MIP was used to investigate the pore characteristics of hardened cement paste with w/c ratio 0.23, 0.35 and 0.53, respectively, in order to research the quantitative relationship between transport properties and pore characteristics in cement-based composite materials. The results show the second intrusion mercury could well determine the effective pore structure parameters, and effective porosity accounts for 25% to 50% of total porosity in cement paste. At the same time, the existence of the first and second peak in pore size distribution curves is confirmed by MIP, such as, the first peak in hardened cement paste with water to cement ratio 0.53 is very distinct, however, with the decrease of water to cement ratio, the first peak gradually disappears. The pore diameter corresponding to the first and second peak is critical pore diameter of capillary pore and gel pore, respectively.

Electrical Resistivity and Dielectric Properties of Hardened Cement Paste and Mortar

1995 ◽  
Vol 411 ◽  
Author(s):  
D. Buerchler ◽  
B. Elsener ◽  
H. Boehni
Keyword(s):  
Electrical Resistivity ◽  
Dielectric Properties ◽  
Water Content ◽  
Cement Paste ◽  
Pore Solution ◽  
Hardened Cement ◽  
Hardened Cement Paste ◽  
Solution Composition ◽  
Cement Based Materials

ABSTRACTWater content, porosity, pore solution composition, resistivity and dielectric properties of hardened cement paste and mortar samples have been studied as a function of time and relative humidities. A model for the resistivity of cement based materials is presented and an interpretation of the dielectric properties is proposed.

An Experimental Study of Water in Pore System of Hardened Cement Paste by Magnetic Resonance

2013 ◽  
Vol 539 ◽  
pp. 14-18
Author(s):  
An Ming She ◽  
Wu Yao ◽  
Wan Cheng Yuan
Keyword(s):  
Cement Paste ◽  
Water Distribution ◽  
Transverse Relaxation Time ◽  
Bimodal Distribution ◽  
Early Age ◽  
Hardened Cement ◽  
Hardened Cement Paste ◽  
Initial Water ◽  
Cement Ratio ◽  
Water To Cement Ratio

The water distribution in hardened cement paste with different ages, water to cement ratio (w/c) and different cured methods were investigated by low field NMR. The transverse relaxation time, T2, was used as a parameter to describe the water phase constrained in pores. The results show that the T2 distributions of pastes in the early age are bimodal distribution. As the curing time increase, the T2 distribution peaks shift gradually to the short T2 values reflecting the decrease of mean pore dimension as well as the increase of specific surface area resulted from the gel products. In addition, the influences of initial water to cement ratio and cure methods on water distribution are occurred mainly during the early age. When cured to 28 days, the differences of water distribution in various samples are unconspicuous.

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