The development of high-strength mortars with improved thermal and acid resistance

Соболев, Константин; Yeğinobali, Asim

doi:10.1016/j.cemconres.2004.06.016

Cited by 22 publications

(3 citation statements)

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“…However, the beneficial effect of these materials on acidic attack is still under review. While some research works point towards improvement through the use of silica fume or fly ash (Kim et al 2007;Sobolev and Yeginobali 2005;Roy et al 2001;Fattuhi and Hughes 1988 b;Kawai et al 2005), others works report that silica fume and fly ash have only little or no effect on the durability of concrete under acid attack (Pavlik 1996;Grube and Rechenberg 1989;Pavlik and Uncik 1997). Some of the authors attributed this lack of performance of SCM to the reduction of Ca(OH) 2 , which readily reacts with acid, thereby protecting the C-S-H from the adverse affect of acid.…”

Section: Introductionmentioning

confidence: 99%

Resistance of Mineral Admixture Concrete to Acid Attack

Goyal

Kumar

Sidhu

et al. 2009

ACT

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The effect of an aggressive chemical environment on concrete prepared with ordinary Portland cement and silica fume, either as a binary combination or a ternary combination with fly ash, is investigated in the present study. The adverse environmental conditions are simulated by using either 1% sulfuric acid, 1% hydrochloric acid or 1% nitric acid. The corrosion process was monitored by measuring the mass loss and compressive strength for a period of one year. It was found that the course of action of acid attack is dependent on the type of acid and solubility of the calcium salt formed. The presence of mineral admixtures was found to lower the detrimental effect of all types of acids on concrete. Ternary mixes with OPC, silica fume and fly ash performed better than binary mixes containing only silica fume as supplementary cementitious material.

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Section: Introductionmentioning

confidence: 99%

Resistance of Mineral Admixture Concrete to Acid Attack

Goyal

Kumar

Sidhu

et al. 2009

ACT

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“…Many structures lose their serviceability every year due to the acidic environments [5][6][7][8][9]. is has led researchers to explore the deterioration properties of the acid solution of the concrete structure to find out an effective way to protect them [10]. Brown and Clifton [11] studied the mechanism of deterioration in cement-based materials and lime mortar.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Physicochemical and Mechanical Properties of Mortar Subjected to Acid Corrosion

Huo

2018

Advances in Materials Science and Engineering

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e 28 days cured cement mortar samples were soaked in HCl (pH � 1 and 2) and H 2 O (pH � 7) solutions for 90 days. By monitoring the ion concentration of H + and Ca 2+ and measuring the changes in weight loss, longitudinal wave velocity, and uniaxial compressive strength values of the corroded mortar, the physicochemical and mechanical properties of the mortar specimens were studied. Experimental results indicate that the process of the mortar sample subjected to HCL erosion has apparent stage characteristics. In the initial stage of corrosion, the chemical reaction increased the porosity of the specimen, which leads to the decrease of longitudinal wave velocity of the samples. At the same time, the corrosion solution continuously penetrates into the mortar pore system, which leads to the increase of the mass, and it is considered that the diffusion process plays a leading role during this period. Moreover, the colloidal compounds generated by the chemical reaction can not only fill the pore space but also block the continuous reaction, which led to the increase of the longitudinal wave velocity of the specimen. With the prolonging of corrosion time and infiltration path, the pH value and the concentration of Ca 2+ tend to be stable, the diffusion action is weakened, and the chemical reaction is continuous, which led to the decrease of the mass and wave velocity gradually. It is considered that the chemical reaction plays a leading role in this process. Based on the induction and analysis of the test results, a generalized porosity model regarding the increase of the porosity and the decrease of effective bearing area of the mortar sample was proposed. e relation between the uniaxial compressive strength and the corrosion time of the corroded mortar is deduced, and the unknown parameters are determined based on the regression analysis of the test data.

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“…These mortars, in addition to high strength, demonstrate high thermal and acid resistance. [3] The effects of high temperature on the mechanical properties of cement based mortars containing pumice and fly ash were investigated by Serdar Aydın et al Four different mortar mixtures with varying amounts of fly ash were exposed to high temperatures of 300, 600, and 900 °C for 3 h. The residual strength of these specimens was determined after cooling by water soaking or by air cooling. Also, microstructure formations were investigated by X-ray and SEM analyses.…”

Section: Introductionmentioning

confidence: 99%