水泥-粉煤灰体系早龄期液相离子浓度与电导率的关系

doi:10.11896/j.issn.1005-023X.2018.12.024

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Abstract Based centrifugation and high-pressure extraction, liquid phase of cement-fly ash system between 0—1 h and 5—24 h were extracted respectively. In order to explore the influence from different dosage of fly ash on the ion concentration and the conductivity in liquid phase of system, the ion concentration and electrical conductivity were analysed by inductively coupled plasma optical emission spectrometry (ICP-OES), pH meter and conductivity meter. The results show that along hydration time, K⁺ concentration present downward trend firstly and then increased gradually, Na⁺ and SiO₄^4- concentration and pH increased gradually, Ca²⁺ and SO₄^2- concentration present on the contrary with K⁺ concentration reaching the peak value around 5 h, AlO₂^- concentration present similarly with Ca²⁺ and SO₄^2- concentration arriving the peak value around 10 h. Ions concentration and conductivity in liquid phase of cement-fly ash system are decreased along with the increasing dosage of fly ash(0%,10%,30% and 50%), and three stages (dissolution, induction, and acceleration) during the early hydration of cement-fly ash system are identified according to the characteristics of the laws of liquid conductivity change. Liquid conductivity are positively correlated with the total ion concentrations, mainly affected by K⁺, Na⁺ and OH^-, and the relationships between single ion and the liquid conductivity are influenced significantly by high dosage(50%) of fly ash.

Key words： cement fly ash early hydration time liquid phase ion concentration conductivity

Published: 20 July 2018

CLC number:

TU528.44

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	Articles by authors
	QIAN Rusheng
	ZHANG Yunsheng
	ZHANG Yu
	YANG Yonggan

Cite this article:

QIAN Rusheng,ZHANG Yunsheng,ZHANG Yu, et al. Relationships Between Liquid Ion Concentration and Electrical Conductivity During the Early Hydration of Cement-Fly Ash System[J]. Materials Reports, 2018, 32(12): 2066-2071.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.12.024 OR http://www.mater-rep.com/EN/Y2018/V32/I12/2066

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