Investigation of strength and hydration characteristics in nano-silica incorporated cement paste

被引：195

作者：

Rupasinghe, Madhuwanthi ^{[1
]}

Nicolas, Rackel San ^{[1
]}

Mendis, Priyan ^{[1
]}

Sofi, Massoud ^{[1
]}

Tuan Ngo ^{[1
]}

机构：

[1] Univ Melbourne, Parkville, Vic 3010, Australia

来源：

CEMENT & CONCRETE COMPOSITES | 2017年 / 80卷

关键词：

Cement paste; Nano-silica; Hydration modelling; Compressive strength modelling; X-ray powder diffraction (XRPD); Thermal gravimetric analysis (TGA); C-S-H; PORTLAND-CEMENT; BACKSCATTERED ELECTRON; CALCIUM-SILICATE; POZZOLANIC REACTIVITY; SECONDARY COMPONENT; MECHANICAL-BEHAVIOR; FLY-ASH; CONCRETE; NANOSILICA;

D O I：

10.1016/j.cemconcomp.2017.02.011

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

A hydration model for Portland cement pastes modified with nano-silica in partial substitution is formulated based on the nucleation growth process from microstructural investigations over time. The model is calibrated against thermogravimetry, X-ray diffraction and calorimetry data for four different substitution rates from 0 to 12 wt% and is validated by backscattered electron microscopy. Finite element based compressive strength predictions using representative volume element analysis of the nano modified cement pastes agreed with the experimental values. The model predictions indicate that a rate of 8 wt% is the optimum replacement level of cement by nano-silica leading to a high density matrix promoting a maximum mechanical strength. (C) 2017 Elsevier Ltd. All rights reserved.

引用

页码：17 / 30

页数：14

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