Curing of water glass-Portland cement-CaSiO3 system under hydrothermal conditions

1984 ◽  
Vol 3 (6) ◽  
pp. 477-480
Author(s):  
Naohito Uetake ◽  
Hideo Yusa
Keyword(s):  
Portland Cement ◽  
Water Glass ◽  
Hydrothermal Conditions

scholarly journals Lime Treatment of Wastewater from Tunnel Construction Using Water Glass and Portland Cement for Groutinig

1990 ◽  
Vol 13 (3) ◽  
pp. 163-172,161
Author(s):  
Toshiro MARUYAMA ◽  
Masaki MIYANE ◽  
Ryoichi YAMADA ◽  
Fumio TAKASHIMA
Keyword(s):  
Portland Cement ◽  
Water Glass ◽  
Tunnel Construction ◽  
Lime Treatment

scholarly journals Effect of Ordinary Portland Cement and Water Glass on the Properties of Alkali Activated Fly Ash Concrete

Minerals ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 40 ◽  
Author(s):  
Vytautas Bocullo ◽  
Danutė Vaičiukynienė ◽  
Ramūnas Gečys ◽  
Mindaugas Daukšys
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Portland Cement ◽  
Water Glass ◽  
Ordinary Portland Cement ◽  
Reference Sample ◽  
Freeze And Thaw ◽  
Naoh Solution ◽  
Increased Strength ◽  
Alkali Activated

This research presents the influence of ordinary Portland cement (OPC) and/or water glass addition on fly ash alkali-activated mortar and concrete. The results show that fly ash (FA) concrete activated with a NaOH solution and water glass mixture had better resistance to freeze and thaw, carbonation, alkali-silica reaction (ASR) and developed higher compressive strength and static elastic modulus compared with the FA concrete activated only with an NaOH solution. The addition of OPC contributes to the development of a denser microstructure of alkali activated concrete (AAC) samples. In the presence of water glass and OPC, the compressive strength (52.60 MPa) of the samples increased more than two times as compared with the reference sample (21.36 MPa) without OPC and water glass. The combination of OPC and water glass showed the increased strength and enhanced durability of AAC. The samples were more resistant to freeze and thaw, ASR, and carbonation.

Pore Structure Analysis of Portland Cement and Blended Portland Cements Cured under Hydrothermal Conditions

2014 ◽  
Vol 1000 ◽  
pp. 235-238
Author(s):  
Tomáš Ifka ◽  
Martin Palou ◽  
Marta Kuliffayova ◽  
Martin Boháč ◽  
Františka Frajkorová ◽  
...  
Keyword(s):  
Portland Cement ◽  
Pore Structure ◽  
Blast Furnace Slag ◽  
Steam Pressure ◽  
Hydraulic Permeability ◽  
Hydrothermal Conditions ◽  
Cement Pastes ◽  
Hydrothermal Curing ◽  
Hydrate Products ◽  
Furnace Slag

The pore structure of Portland cement pastes cured under different hydrothermal regimes was analyzed. Pore size distribution (PSD), hydraulic permeability coefficient (HK) and porosity (P) were found depending on temperature and steam pressure. With increasing hydrothermal characteristics, the pore structures degraded causing the depletion in compressive strength. Then, blast furnace slag (BFS) and silica fume (SF) were added to PC and cured under similar conditions. It was found that the pore structure was greatly improved. The effect of hydrothermal curing may be interpreted by the intensity and position of the peak, by the length and bimodal characteristic of PSD. The maximum concentration of pores of reference cement paste lies in the range 10 – 103 nm, and changes progressively to the size < 10 nm with increasing addition of BFS and SF. This behavior is attributed mainly to the presence of SF. Microstructure analysis shows hydrate products like needle CSH and CASH, which were stable under hydrothermal curing.

Strength Enhancement of Geopolymer-Based Concretes by Mixed Alkaline Activators

2010 ◽  
Vol 658 ◽  
pp. 292-295 ◽  
Author(s):  
Z. X. Yang ◽  
Kyu Hong Hwang ◽  
M.C. Kim ◽  
J.Y. Yang ◽  
S.K. Lim
Keyword(s):  
Fly Ash ◽  
Portland Cement ◽  
Co2 Emission ◽  
Water Glass ◽  
Bending Strength ◽  
Construction Material ◽  
Recycled Concrete ◽  
Geopolymer Concrete ◽  
New Material ◽  
Main Components

As a relatively new material, geopolymer concrete offers benefits as a construction material for sustainable development. It utilizes waste materials such as recycled concrete sludge, fly ash,etc. To reduce CO2 emission, geopolymer concrete is expected to replace the traditional Portland cement based concrete. It’s reported that geopolymer based concrete releases only 1/6 CO2 compared to those of based Ordinary Portland Cement (OPC). In this study, to obtain a new type of construction material with lower CO2 emission and energy consumption, fly ash, waste concrete sludge and metakaolin were used as the main components. Solution of NaOH/KOH and water glass were applied as alkaline activator. The amount of water glass and the ratio of alkaline/water glass were varied to reach an optimal value. Also, silica fume was added as a bonding matrix to enhance the strength, and the specimens were cured in air and oven, then their mechanical properties such as compressive strength and bending strength were measured and their microstructures were investigated.

scholarly journals Influence of Water Glass Introduction Methods on Selected Properties of Portland Cement

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3257
Author(s):  
Wiktor Szewczenko ◽  
Galyna Kotsay
Keyword(s):  
Portland Cement ◽  
Cement Paste ◽  
Water Glass ◽  
Setting Time ◽  
Solid States ◽  
Effect Of Water ◽  
Modelling Method ◽  
Influence Of Water ◽  
Mixing Water

This article presents a study of the effect of water glass and its introduction on the hydration of Portland cement and its properties in plastic and solid states. The introduction of sodium water glass into the mixing water extends the setting time of Portland cement by 35%, while introduction into the cement paste reduces it by 24.4%; for potassium water glass, the respective values are 10.8% and 10.8%. The introduction of sodium water glass into the mixing water decreases its consistency by 17.6%; its introduction into the cement paste reduces its consistency by 97%. Based on microcalorimetric studies and using the modelling method, mechanisms of the processes occurring in the cement paste, for various methods of introducing water glass admixtures, and their influence on the properties of cement are proposed. The important implications of the obtained results are that, using various methods for introducing admixtures of water glass, it is possible to regulate the setting of cement slurries within significant limits that are important during their transportation.

scholarly journals Phase Composition of Silica Fume—Portland Cement Systems Formed under Hydrothermal Curing Evaluated by FTIR, XRD, and TGA

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2786
Author(s):  
Eva Kuzielová ◽  
Michal Slaný ◽  
Matúš Žemlička ◽  
Jiří Másilko ◽  
Martin Tchingnabé Palou
Keyword(s):  
Portland Cement ◽  
Silica Fume ◽  
High Temperature Phase ◽  
Molecular Water ◽  
Temperature Phase ◽  
Polymerization Degree ◽  
X Ray Diffraction ◽  
Hydrothermal Conditions ◽  
X Ray ◽  
Treatment Regimes

Two substitution levels of Portland cement by silica fume (SF; 30 and 50 mass%) and three hydrothermal treatment regimes (0.5, 1.2, and 2 MPa and 165, 195, and 220 °C for 7 days, respectively) were selected for the investigation of high-temperature phase formation. A combination of thermogravimetric, X-ray diffraction, and Fourier transform infrared analyses in the mid-IR region was used to overcome the shortcomings of individual techniques for the identification of these complex systems. Changes in molecular water amounts, the polymerization degree of silicate chains, or their decomposition due to transformations and crystallization of phases at hydrothermal conditions were observed and discussed concerning composition. Contrary to the calciochondrite, hydrogrossular phases, α-C2SH, and jaffeite detected in the systems without SF, a decrease in CaO/SiO2 ratio resulted in the formation of stable tobermorite in the case of 30 mass% SF, whilst calcium hydrogen silicate, gyrolite, and cowlesite were identified as more thermally stable phases in the samples with 50 mass% SF.

scholarly journals Effect of Water Glass on Early Hardening of Portland Cement

2017 ◽  
Vol 172 ◽  
pp. 977-981 ◽  
Author(s):  
Shevchenko Viktor ◽  
Kotsay Galyna
Keyword(s):  
Portland Cement ◽  
Water Glass ◽  
Effect Of Water

Research on Durability Performance of Novel Double Solution Grouting Material with Metakaolin

2011 ◽  
Vol 250-253 ◽  
pp. 722-727 ◽  
Author(s):  
Chao Yan ◽  
Qing Jun Ding ◽  
Jian Ping Xu ◽  
Hong Xi Wang
Keyword(s):  
Corrosion Resistance ◽  
Portland Cement ◽  
Water Glass ◽  
Structural Model ◽  
Gelation Time ◽  
Aqueous Dispersion ◽  
Cementitious Materials ◽  
Grouting Material ◽  
Grouting Materials ◽  
Resistance Performance

At the present, Portland cement-water glass double solution grouting materials have many problems, such as the instability of gelation time and of products, and poor groundwater-corrosion resistance performance, etc. A way to improve the performances of double solution grouting materials was studied by adding metakaolin into the systems. Based on the rapid gelation performance of Portland cement-water glass and the durability of alkali-activated salic cementitious materials, an ideal structural model of the novel anti-aqueous dispersion and anti-aqueous dissolution grouting material (AAGM) was established. Series of experiments were prepared to verify the Na+ solidification and water-corrosion resistance performance of the metakaolin-water glass double solution grouting materials which combined with cement. The results indicated that the compact structure of AAGM was composed of a dominant ingredient of (Na,Ca)-Si-Al-H zeolite gel and a minor part of C-S-H. Moreover, it was shown that the AAGM had hydrated product of low solubility and compact microstructure tested by Fourier transform infrared spectra (FTIR) and transmission electron microscopy (SEM), which proved the well anti-aqueous dispersion and anti-aqueous dissolution performance.

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