Chloride permeability of concrete applied with basalt fiber and nano-SiO2 modified mortar coatings

The influence of nano-SiO2 (NS) and basalt fiber (BF) modified cementitious coatings on chloride permeability in concrete and the influence mechanism explored by differential scanning calorimetry thermogravimetry (DSC-TG), X-ray diffraction (XRD), scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP) was studied. Results show that the chloride penetration resistance was significantly improved in the concrete applied with special mortar coating as compared to the non-coated variety, especially in concrete applied with 5 % NS and 0.5 % BF in a 6 mm modified mortar coating. Moreover, the mechanism analysis reveals that, all together, the heterogeneous nucleus effect, the high pozzolanic activity and micro-aggregate filling effect of NS, the inhibiting effect of BF on connected cracks and pores, and their grading advantage and synergy, improved the ability of concrete to counter chloride diffusion.

1 Introduction

Marine environment can seriously corrode and destroy the concrete structure. Chloride ion erosion, sulfate erosion, carbonation, microbiological corrosion, dry and wet alternation, and wave erosion and abrasion caused by storm are major causes of corrosion damage to marine concrete [1-3]. Among them, corrosion damage caused by chloride ions is especially prominent and seriously harmful to the safety and durability of marine engineering concrete [4-6]. Therefore, the investigation and modification research of the durability of concrete structures in marine environment are a...

Related articles:


Effect of nano-TiO2 on chloride ingress in cementitious material

1 Introduction Severe durability problems caused by chloride ingress into concrete in a marine environment, such as reinforcement corrosion, cracking and peeling, performance degradation and decrease...

Issue 2020-11-12 US 2020/0317568 A1

Method for the production of Portland cement composition with low embodied energy and carbon for abrasion resistant concrete and mortar

(22) 26.03.2020 (43) 08.10.2020 (57) Portland cement has high embodied energy and embodied carbon associated with its manufacture. In many construction applications, the need for concrete and mortar...

Issue 2017-6 Wuhan University of Technology | Wuhan Textile University

Chloride penetration resistance of ­micron-nano materials modified mortar used as a concrete coating

1 Introduction In the field of construction, the 21st century is considered to be the century of the ocean [1]. In recent decades, with the steady development of the marine economy, the construction...

Issue Drymix 2015 MC-BAUCHEMIE

New R2 and R3 repair mortars complete the Nafufill concrete replacement portfolio

The concrete replacement systems Nafufill LM and Nafufill KM 250 have a highly successful track record in the repair of both structural and non-structural concrete components. Now, with ­Nafufill...

Issue 2014-12

Innovative binder based on activated fly ash for products with chemical and corrosive load

1 Conventional systems By using cement in a binder system for dry mortars or concrete the hydration of the different clinker phases provides the strength and the resistance of the matrix. To improve...