Chemical Shrinkage and Compressive Strength of Binary Blended Cement Systems

【Author】

Pipat Termkhajornkit;Jeffrey J.Chen;

【Abstract】

<正>Quantification of the hydration degree of supplementary cementitious materials(SCMs) is key to understand the contribution of SCMs to the compressive strength of blended cement paste.However,due to the chemical and mineralogical complexity of SCMs, measurement of degree of hydration is challenging.In this study,the chemical shrinkage of blended cement paste with slag,fly ash and pozzolan were measured and compared with compressive strength.The results show that,at constant volumetric ratio of water to solids,there is a close relationship between compressive strength and chemical shrinkage for OPC pastes blended with inert quartz,slag,or a natural pozzolan. However,fly-ash followed a different trend.For example,the chemical shrinkage of non-ground fly ash was surprisingly higher than that of ground fly ash,even though the ground fly-ash showed higher strength.This reversed trend is due to the presence of disconnected pores within the non-ground fly ash particle.When these particles react and dissolve,the previously disconnected pores become increasingly accessible to water. The observed chemical shrinkage is thus artificially increased due to the "extra" water that can enter into the previously inaccessible pore space.The effect causes the chemical shrinkage-strength curve to depart from the general trend followed by SCMs lacking occluded pores. Originality The originality of this paper is the separation of the hydration kinetics of SCMs of OPC.It is also give a clear example where chemical shrinkage is useful.The paper also mentions the limit of chemical shrinkage for some SCMs.

【Keywords】

supplementary cementitious materials;;chemical shrinkage and compressive strength

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