Evolution of elastic behavior of alite paste at early hydration stages

• DOI: 10.1111/jace.17354
• Publication Date: 2020-07-09T20:35:50Z
• Authors: Tingjie Huang; Qiang Yuan; Shenghao Zuo; Caijun Shi
• Keywords: Calcium silicate hydrate; Elasticity; Volume fraction; Isothermal process

Abstract Elastic behavior is an important aspect of fresh cement‐based materials. In this paper, the elasticity development pure alite paste within 5 hours was monitored in situ by small amplitude oscillation shear. Isothermal microcalorimetry, X‐ray diffraction, scanning electronic microscopy, 1 H nuclear magnetic resonance, zeta potential measurements were used to investigate underlying mechanisms. It found that evolution storage modulus can be characterized three different stages. The first stage stems from compression electrical double layer and slight increase solid volume fraction; second only controlled colloidal interaction; third associated significant growth fraction, enhancement short‐range attraction rigidification calcium silicate hydrate (CSH) network. Moreover, relationship between formation CSH also quantified.