Abstract
Nowadays, the application of nano materials is getting attention to enhance the conventional concrete properties. The ultrafine particles of nano material also will help reducing the formation of micro pores by acting as a filler agent, produce a very dense concrete and will reduce the growth of micro pores in the UHPC structures. The introduction of nano materials in concrete is to increase the strength and durability of concrete. One of the most important factor affecting concrete durability is chloride penetrability. The purpose of this study was to evaluate the chloride permeability and chloride penetration depth by using rapid chloride permeability test (RCPT) and colorimetric method, respectively. The study was conducted for normal performance concrete (NPC), high performance concrete (HPC), ultra-high performance concrete (UHPC) and a series of UHPC (nano metaclayed-UHPC) incorporating different replacement levels of nano metaclay. All the tests were performed at ages of concretes from 3 up to 365 days. The results showed that the presence of silica fume in HPC and nano metaclay in UHPC reducing the Coulombs passed on the 56-days up to 365-days. The experimental results also revealed the depth of chloride ion penetration for nano metaclayed-UHPC concretes are much lesser than those concretes. As regards to the results, nano metaclay led to noticeable benefit in term of chloride resistance.
Highlights
The most important characteristic of concrete is believed to be the one that affecting its durability of concrete
As a comparison with previous researches [18, 19], this study aimed to evaluated the chloride penetration profiles in various concrete types which are normal performance concrete (NPC), high performance concrete (HPC), ultra-high performance concrete (UHPC) and a series of UHPC integrating nano metaclay as cement replacement
Based on the experimental results of this research, the following conclusions can be drawn: i) It is deduced that the presence of silica fume and nano metaclay in concrete is effective in reducing Coulombs passed at 56-days up to 365-days
Summary
The most important characteristic of concrete is believed to be the one that affecting its durability of concrete. Concrete with excellent performance in strength has become one of the most important construction materials. A lot of deterioration is reported for marine construction since marine environments are very aggressive as well as sea water consists mainly of chlorides and sulphates [2]. It has become increasingly apparent that attack by aggressive agents such as chloride penetration can significantly affect a structure to deteriorate. Chloride ions can penetrate through the concrete pore network, potentially leading to the corrosion of steel reinforcement in the initiation stage [3]. The corrosion of reinforcing steel in concrete due to chloride penetration in RC structures has received increasing attention in recent years due to its widespread occurrence and the high cost of repair [4, 5]
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