Effect of Complex Organo-Mineral Modifier on the Properties of Corrosion-Resistant Concrete

Abstract

This paper reports the results of a research study aimed at identifying the compositional features of fly ash (FA) TPP “Pha Lai” (Vietnam), silica fume SF-90 (SF90) and superplasticizer SilkRoad SR 5000F (SR5000) contents that influence the sulfate resistance of corrosion-resistant concrete. The effect of FA, SF90 and SR5000 on the strength of corrosion-resistant concrete is obtained quickly, high early-strength concrete. In details, the compressive strength at the age of 1 and 3 days are respectively 29.6% and 61.13% in comparison to 28 days period. The deformation of corrosion-resistant concrete prisms in 5% sodium sulfate solution after 28 days of testing were determined by Russian standard GOST P 56687-2015. Using the mathematical planning method for four factors and the Matlab computer programs was obtained the mathematical model, which was adequately described the influence ofthe water-binding ratio, FA, SF90 and SR5000 contents on the concrete deformation. It was also noted that the effect of FA content is more pronounced than the water-binding ratio and content SF90. In addition, the effect of SR5000 content on the deformation of concrete is negligible, so it was discarded.

Effect of organo-mineral additives on physical-mechanical properties and corrosion resistance of sand-cement mortars

“…1. X-ray spectrum of sulfate-resistant Portland cement CEM I CC 42.5 N produced by "Tam Diep" • the amount of polycarboxylate super-plasticizer SR 5000F as part of the organo-mineral additive equal to1% of the binder weight, was chosen with reference to [13,14];…”

“…В современном строительстве наиболее технологичным, экономически целесообразным и универсальным способом улучшения свойств бетонов различного назначения является применение комплексных модифицирующих составов, в том числе добавок, содержащих техногенные отходы, с целью получения бетона с высокой прочностью и долговечностью [1][2][3][4][5][6][7][8]. Один из основных показателей долговечности бетонов гидротехнического назначения -их стойкость к сульфатной коррозии [9][10][11][12][13].…”

“…The addition of multi-component modifying compositions, including additives that contain technogenic waste, to concretes in an effort to make them strong and durable, is the most technology-intensive, economically expedient and universal method of improving properties of concretes having different applications in the present-day construction industry [1][2][3][4][5][6][7][8]. Sulfate corrosion resistance is one of the main durability factors demonstrated by hydraulic concretes [9][10][11][12][13].…”

“…• допускалось использование низкокальциевой ЗУ для замены 30 % масс. портландцемента в соответствии с ACI 211.4R-2008 13 ;…”

“…• количество поликарбоксилатного суперпластификатора SR 5000F в составе органоминеральной добавки, равное 1 % от массы вяжущего, было выбрано на основании результатов работ [13,14];…”