WUHAN TEXTILE UNIVERSITY | WUHAN UNIVERSITY OF TECHNOLOGY

Effect of nano-SiO2 and curing temperature on the mechanical properties and hydration characteristics of cement systems containing a high volume of fly ash

In the search for an effective way of increasing the early strength of cement systems containing a high volume of fly ash (CHVFA), nano-silica (NS) was used in the CHVFA systems with two curing modes: standard curing (20 ± 2 °C, RH ≥ 95 %) for 3 days and steam curing (65 ± 2 °C, RH ≥ 95 %) for 12 h and then standard curing for 60 h. The effect of NS and curing temperature on the hydration of cement and fly ash and on the pore structure of the paste were studied in the search for the underlying mechanism.

1 Introduction

Chinese cement output has ranked first in the world continuously for 32 years, accounting for over half of the global total with 2,402,950,000 t in 2016 alone [1]. More and more attention has therefore been given to the application of supplementary cementitious materials (SCMs) that could partially replace cement. As a coal-fired country, coal is the main source of energy in China at present and will be for a fairly long period. Fly ash (FA) is the inevitable product of coal-fired power generation and every 4 t of coal consumption produces 1 t of FA. In 2015 alone it is estimated...

Find out more in the current Issue. Order now!

Related articles:

5/2018 WUHAN UNIVERSITY OF TECHNOLOGY | WUHAN TEXTILE UNIVERSITY

Influence of sodium sulfate on hydration and microstructure of cement high volume fly ash system under steam curing

1 Introduction Coal is the main source of energy in China, and in current and coming decades, it will still play the greatest role in the primary energy structure. Fly ash (FA) is the inevitable...

more
7-8/2018 WUHAN TEXTILE UNIVERSITY | WUHAN UNIVERSITY OF TECHNOLOGY

Influence of nano-TiO2 on mechanical property and hydration characteristic of cement high volume of fly ash system

1 Introduction China is a coal-fired country. Both at present and for a rather long time to come, coal is and will remain the country’s main source of energy. Fly ash (FA) is an inevitable product of...

more
3/2015 KAZAN STATE UNIVERSITY OF ARCHITECTURE AND ENGINEERING

Research on the influence of the carbon ­nanotubes injection method on cement composite properties

1 Introduction One of the ways of service properties development for heavy weight concrete is modification with chemical additives and carbon nanotubes (CNT). In the present state of the art, the...

more
7-8/2018 WUHAN UNIVERSITY OF SCIENCE AND TECHNOLOGY

Effect of cupric nitrate on the hydration of remaining slag from titanium-bearing BF slag

1 Introduction Heavy metal-bearing waste generally requires solidification/stabilization (S/S) [1-3] which is a processing method of high efficiency, low cost and low risk causing no secondary...

more
11/2016 WUHAN UNIVERSITY

Effect of nano-TiO2 on the hydration and hardening of fly ash/cement systems

1 Introduction Fly ash (FA) has the advantages of improving the workability [1], decreasing the porosity and increasing the late strength and durability [2-4] of cement-based materials. However,...

more