Evaluation of rheo-viscoelasticity of magnesium-silicate-hydrate mixes incorporating different superplasticizers

IF 6.2 2区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Developments in the Built Environment Pub Date : 2024-09-15 DOI:10.1016/j.dibe.2024.100544
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Abstract

This study investigated rheo-viscoelastic behaviors of MgO-SiO2 pastes with three phosphate additives (sodium hexametaphosphate (SHMP), sodium trimetaphosphate (STMP), and sodium orthophosphate (SOP)) as superplasticizers. Static yield stress, dynamic yield stress, median differential viscosity, thixotropic loop area, structural recovery rate, and non-destructive structural build-up were analyzed. Furthermore, assessment of hydration and particle dispersion stability was facilitated by employing isothermal calorimetry, XRD, DTG, and zeta potential techniques. SHMP significantly decreased the static and dynamic rheology, thixotropy, and viscoelastic evolution. Samples incorporating 2 wt% SOP exhibited enhanced rheological parameters, particularly static yield stress, owing to increased brucite formation and a denser microstructure in the fresh paste. Adsorption of phosphate additives on MgO surfaces inhibited formation of brucite and improved interparticle electrostatic repulsion, thereby increasing suspension stability. High-efficiency adsorption of SHMP on MgO surfaces, coupled with the retardation of brucite nucleation-and-growth, and enhancement in suspension stability, greatly restrained the rheo-viscoelastic evolution of MgO-SiO2 system.

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掺入不同超塑化剂的硅酸镁水合物流变-粘弹性评估
本研究调查了使用三种磷酸盐添加剂(六偏磷酸钠(SHMP)、三偏磷酸钠(STMP)和正磷酸钠(SOP))作为超塑化剂的氧化镁-二氧化硅浆料的流变-粘弹性行为。对静态屈服应力、动态屈服应力、中值差粘度、触变环面积、结构恢复率和非破坏性结构堆积进行了分析。此外,还采用等温量热法、XRD、DTG 和 zeta 电位技术对水合和颗粒分散稳定性进行了评估。SHMP 明显降低了静态和动态流变性、触变性和粘弹性演变。添加了 2 wt% SOP 的样品表现出更高的流变参数,尤其是静态屈服应力,这是因为新鲜浆料中的青金石形成增多,微观结构更加致密。磷酸盐添加剂在氧化镁表面的吸附抑制了青卤石的形成,改善了颗粒间的静电排斥,从而提高了悬浮液的稳定性。氧化镁表面对 SHMP 的高效吸附,加上对青金石成核和生长的延缓,以及悬浮液稳定性的提高,极大地抑制了氧化镁-二氧化硅体系的流变-粘弹性演变。
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来源期刊
CiteScore
7.40
自引率
1.20%
发文量
31
审稿时长
22 days
期刊介绍: Developments in the Built Environment (DIBE) is a recently established peer-reviewed gold open access journal, ensuring that all accepted articles are permanently and freely accessible. Focused on civil engineering and the built environment, DIBE publishes original papers and short communications. Encompassing topics such as construction materials and building sustainability, the journal adopts a holistic approach with the aim of benefiting the community.
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