scholarly journals Effects of Electrochemical Chloride Extraction on Hydrated Products of Various Cement Paste Systems

2015 ◽  
Vol 13 (12) ◽  
pp. 564-582 ◽  
Author(s):  
Hai Yen Nguyen Thi ◽  
Hiroshi Yokota ◽  
Katsufumi Hashimoto
Keyword(s):  
Cement Paste ◽  
Hydrated Products ◽  
Electrochemical Chloride Extraction

Prediction of Elastic Modulus of Cement-Based Materials Based on Power’s Volume Model

2012 ◽  
Vol 253-255 ◽  
pp. 474-477 ◽  
Author(s):  
Lang Wu ◽  
Bing Yan ◽  
Bin Lei
Keyword(s):  
Elastic Modulus ◽  
Elastic Properties ◽  
Cement Paste ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Micromechanics Model ◽  
Volume Model ◽  
Cement Based Materials ◽  
Hydrated Products ◽  
Multi Phase

The hydrated products, unhydrated cement and water (capillary pores) in the cement paste are seen as matrix, inclusion, Equivalent medium respectively, We used the micromechanics theories and Power’s Volume model to develop a multi-phase micromechanics model capable of simulating the elastic properties of cement-based materials, and the evolution of elastic properties in the hydration process was calculated at different water-cement ratio. The final experimental results show that this model can be used to predict the elastic properties of cement-based materials.

The Effect of Bond Characteristics between Steel Slag Fine Aggregate and Cement Paste on Mechanical Properties of Concrete and Mortar

1987 ◽  
Vol 114 ◽  
Author(s):  
Wang Yuji
Keyword(s):  
Mechanical Properties ◽  
Cement Paste ◽  
Steel Slag ◽  
Fine Aggregate ◽  
Interfacial Zone ◽  
Curing Time ◽  
Natural Sand ◽  
Concentration Of Ions ◽  
Hydrated Products ◽  
Bond Characteristics

ABSTRACTThe ordinary fine aggregate in concrete has been replaced by ground and sieved steel slag fine aggregate, treated and exposed to air for three months. Compared with concrete made from natural sand, properties such as compressive strength, flexural strength, elastic modulus, permeability and abrasion resistance are considerably improved. The improvement increases with a decrease in w/c ratio, an increase in curing time and an increase in the replacement weight of sand. These results are due to the fact that the steel slag contains some active minerals such as C3S, C2S, C4AF, etc., and shows favorable surface physical characteristics that improve the bond between steel slag particles and cement paste. The results of XRD, SEM and EPM microhardness showed that there are heavier concentration of ions, with finer crystals and a lower degree of CH orientation at the interfacial zone between steel slag particles and cement paste. The study also found small cementitious and fibrous C-S-H crystals growing from the fine aggregate, which are linked with hydrated products from cement paste making the bond and structural characteristic more favorable with cement. The steel slag fine aggregate is an active mineral similar to cement. The bond between the aggregate and cement paste is strengthened both physically and chemically.

The effect of Bond Characteristics Between Steel Slag fine Aggregate and Cement Paste on Mechanical Properties of Concrete and Mortar

1987 ◽  
Vol 113 ◽  
Author(s):  
Wang Yuji
Keyword(s):  
Mechanical Properties ◽  
Cement Paste ◽  
Steel Slag ◽  
Fine Aggregate ◽  
Interfacial Zone ◽  
Curing Time ◽  
Natural Sand ◽  
Concentration Of Ions ◽  
Hydrated Products ◽  
Bond Characteristics

ABSTRACTThe ordinary fine aggregate in concrete has been replaced by ground and sieved steel slag fine aggregate, treated and exposed to air for three months. Compared with concrete made from natural sand, properties such as compressive strength, flexural strength, elastic modulus, permeability and abrasion resistance are considerably improved. The improvement increases with a decrease in w/c ratio, an increase in curing time and an increase in the replacement weight of sand. These results are due to the fact that the steel slag contains some active minerals such as C3S, C2S, C4AF, etc., and shows favorable surface physical characteristics that improve the bond between steel slag particles and cement paste. The results of XRD, SEM and EPM microhardness showed that there are heavier concentration of ions, with finer crystals and a lower degree of CH orientation at the interfacial zone between steel slag particles and cement paste. The study also found small cementitious and fibrous C-S-H crystals growing from the fine aggregate, which are linked with hydrated products from cement paste making the bond and structural characteristic more favorable with cement. The steel slag fine aggregate is an active mineral similar to cement. The bond between the aggregate and cement paste is strengthened both physically and chemically.

scholarly journals Structure, Fractality, Mechanics and Durability of Calcium Silicate Hydrates

2021 ◽  
Vol 5 (2) ◽  
pp. 47
Author(s):  
Shengwen Tang ◽  
Yang Wang ◽  
Zhicheng Geng ◽  
Xiaofei Xu ◽  
Wenzhi Yu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cement Paste ◽  
Calcium Silicate ◽  
Preparation Method ◽  
Point Of View ◽  
Computational Point ◽  
Calcium Silicate Hydrates ◽  
Binding Phase ◽  
Cement Based Materials ◽  
Hydrated Products

Cement-based materials are widely utilized in infrastructure. The main product of hydrated products of cement-based materials is calcium silicate hydrate (C-S-H) gels that are considered as the binding phase of cement paste. C-S-H gels in Portland cement paste account for 60–70% of hydrated products by volume, which has profound influence on the mechanical properties and durability of cement-based materials. The preparation method of C-S-H gels has been well documented, but the quality of the prepared C-S-H affects experimental results; therefore, this review studies the preparation method of C-S-H under different conditions and materials. The progress related to C-S-H microstructure is explored from the theoretical and computational point of view. The fractality of C-S-H is discussed. An evaluation of the mechanical properties of C-S-H has also been included in this review. Finally, there is a discussion of the durability of C-S-H, with special reference to the carbonization and chloride/sulfate attacks.

Effect of an organic additiveon the rheologyof an aluminous cement paste and consequences on thedensificationof the hardened material

2005 ◽  
Vol 123 ◽  
pp. 189-192
Author(s):  
Y. El Hafiane ◽  
A. Smith ◽  
J. P. Bonnet ◽  
B. Tanouti
Keyword(s):  
Cement Paste ◽  
Aluminous Cement
Sign in / Sign up

Export Citation Format

Share Document