Abstract
In order to enhance the corrosion resistance of concrete to chloride salt, 5% NaCl solution was used to corrode ordinary concrete (OC) and rubber concrete (RC) with 5%, 10%, and 15% rubber content, respectively. By testing the compressive strength, mass, chloride ion concentration at different depths and relative dynamic elastic modulus, the erosion mechanism was analyzed by means of SEM scanning and EDS patterns, and the mechanical properties and deterioration degree of ordinary concrete (OC) and rubber concrete (RC) under the corrosion environment of chloride salt were studied. The results show that: the quality of rubber mixed into concrete increases first and then decreases, and rubber can increase the compressive strength of concrete, improve its internal structure. At the same time, the mechanical properties of concrete in the corrosion environment of chloride salt are improved to a certain extent, and the deterioration degree is reduced. Considering the comprehensive performance of OC and RC in the dry–wet alternation mechanism under chloride salt corrosion, the best content of rubber is 10%.
Highlights
Zhang et al [8] studied the effect of early carbonation curing on the chloride ion penetration resistance of concrete, and the results show that carbonation curing can effectively reduce the corrosion degree of concrete in the marine environment and delay the occurrence of corrosion to a certain extent
The following can be seen intuitively from Figure 1a: (1) The compressive strength of the four groups of specimens cured for 28 days under standard conditions of 0 times of dry–wet alternation shows a trend of first increasing and decreasing with the increase in rubber content, which shows that rubber can improve the compressive strength of standard cured 28d concrete to a certain extent; (2) rubber concrete (RC) performs better than ordinary concrete (OC) in compressive strength under the action of dry–wet alternation in the corrosion environment of chloride salt; (3) In the corrosion environment of chloride salt, with the dry–wet alternation conditions, the compressive strengths of OC and RC both show a “two-stage” mode that first increases rapidly and decreases
The compressive strength of the concretes of RC-1 and RC-3 groups began to decline after 30 times of dry–wet alternation, while the compressive strength of RC-2 group concretes began to decline after 45 times of dry–wet alternation
Summary
Continuous graded crushed stone with particle size not less than 5 mm is used as coarse aggregate. The fine aggregate is natural river sand, which belongs to medium sand, and the fineness modulus is 2.55. Rubber particle size is 20 mesh and density is 1050 kg/m3. For NaCl, analytical reagent type anhydrous sodium chloride was selected. With a water-reducing rate of 37% is employed to guarantee fluidity and water retention
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