Comparison of Mercury Intrusion Porosimetry and multi-scale X-ray CT on characterizing the microstructure of heat-treated cement mortar

Xue, Shanfeng; Zhang, Peng; Bao, Jiuwen; He, Linfeng; Hu, Yu; Yang, Shidi

doi:10.1016/j.matchar.2019.110085

Cited by 69 publications

(27 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The hardened CFGPC showed a smooth surface with high stiffness, which contributed by the amorphous products generated from geopolymerization. Besides the hard surface, the amorphous structure of CFGPC also provides it with many outstanding characteristics in resisting acid [12] and sulphate attack [13], as well as chloride penetration resistance [14] and fire resistance [10,15,16] compared with OPCC [17].…”

Section: Of 15mentioning

confidence: 99%

“…In deriving this equation, not only the data obtained from the present tests were used, but also those reported by Hardjito [16], Rajini and Rao [40], Chang [41], Ryu et al [42] and Sofi et al [43]. In total, 40 pairs of f c ' -f t data sets, including a wide range of strength values, constituted the data pool.…”

Section: Correlation Between F T and F C ' In Cfgpcmentioning

confidence: 99%

See 1 more Smart Citation

Experimental and Statistical Study on Mechanical Characteristics of Geopolymer Concrete

2020

Self Cite

View full text Add to dashboard Cite

This paper studies the statistical correlation in mechanical characteristics of class F fly ash based geopolymer concrete (CFGPC). Experimentally measured values of the compressive strength, elastic modulus and indirect tensile strength of CFGPC specimens made from class F fly ash (CFA) were presented and analyzed. The results were compared with those of corresponding ordinary Portland cement concrete (OPCC) using statistical hypothesis tests. Results illustrated that when possessing similar compressive and tensile strength, the elastic modulus for CFGPC is significantly lower than that of OPCC. The corresponding expressions recommended by standards for the case of OPCC is proved to be inaccurate when applied in the case of CFGPC. Statistical regression was used to identify tendencies and correlations within the mechanical characteristics of CFGPC, as well as the empirical equations for predicting tensile strength and elastic modulus of CFGPC from its compressive strength values. In conclusion, CFGPC and OPCC has significant differences in terms of the correlations between mechanical properties. The empirical equations obtained in this study could provide relatively accurate predictions on the mechanical behavior of CFGPC.

show abstract

Section: Of 15mentioning

confidence: 99%

Section: Correlation Between F T and F C ' In Cfgpcmentioning

confidence: 99%

Experimental and Statistical Study on Mechanical Characteristics of Geopolymer Concrete

2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…Two mixtures were selected for the TGA test, that is, TM1 (G/B = 0%, w/b = 0.35, C paste = 420 kg/m 3 ) and TM14 (G/B = 30%, w/b = 0.4, C paste = 480 kg/m 3 , green glass powder). There was a significant loss of weight in different temperature ranges, that is, 120-150 • C for water loss, 440-460 • C for decomposition of Ca(OH) 2 , 700-730 • C for decomposition of CaCO 3 , and 1200-1400 • C for decomposition of sulphate [57], respectively [58][59][60]. The entire process of heating went with the decomposition of calcium-silicate-hydrate (CSH) gel [61,62].…”

Section: Thermogravimetric Analysis (Tga-dtg)mentioning

confidence: 99%

Effective Utilization of Waste Glass as Cementitious Powder and Construction Sand in Mortar

et al. 2020

Self Cite

View full text Add to dashboard Cite

The purpose of this study is to investigate the availability of waste glass as alternative materials in sustainable constructions. Collected waste glass was ground into waste glass powder (WGP) with similar particle size distribution as Portland cement (PC) and waste glass sand (WGS) with similar grade as sand. The compressive strength was investigated through the Taguchi test to evaluate the effect of different parameters on WGP-blended mortar, which include WG-replacement rate (G/B, 0, 10%, 20%, 30%), water/binder ratio (w/b, 0.35. 0.40, 0.50, 0.60), cementitious material dosage (Cpaste, 420, 450, 480, 500 kg/m3), and color of powder (green (G) and colorless (C)). The alkali–silica reaction (ASR) expansion risk of WGS-blended mortar was assessed. The experimental results indicated that WGP after 0.5 h grinding could be used as substituted cement in mortar and help to release potential ASR expansion. The replacement rate played a dominant role on strength at both the early or long-term age. The water/binder ratio of 0.35 was beneficial to the compressive strength at three days and 0.50 was better for strength at 60 and 90 days. An optimal value of cementitious material dosage (450 Kg/m3) exited in view of its strength, while the effect of the color of WG was minor. WGS could be graded as standard construction sand and no ASR expansion risk was found even for 100% replacement of regular sand in mortar. Through the comprehensive reuse of waste glass, this study could provide basic knowledge and a concept for the sustainable development of building materials.

show abstract

“…e macroproperties was closely related to the microproperties of cementitious materials [36][37][38], and thus further microscopic test and analysis should be conducted to achieve a better understanding on the chloride migration mechanism in unsaturated concrete. In addition, considering the wide use of recycled concrete in construction engineering [39][40][41], the chloride penetration into recycled concrete under the coupling effects of internal moisture content and external RH should be investigated in further.…”

Section: Chloride Migration In Concrete With the Coupling Of Watermentioning

confidence: 99%

Chloride Penetration into Concrete under the Coupling Effects of Internal and External Relative Humidity

Fang

Ming-min

2020

Advances in Civil Engineering

View full text Add to dashboard Cite

Chloride penetration frequently happens in an unsaturated concrete; in this case, the chloride migration is under the coupling effects of internal moisture and external relative humidity (RH). Various chloride attack tests were designed in this paper to investigate the effects of internal moisture and external RH (50–100%) on the chloride penetration into an unsaturated concrete, and the chloride content was determined to quantify the chloride migration in concrete. The results highlighted that there was a good correlation between the chloride penetration into concrete and its internal RH. The chloride ion was difficult to penetrate into concrete when its internal RH was below 50%; however, the chloride penetration rate increased when the internal RH of concrete was above 75%, and the chloride migration increased with increasing RH and exposure duration. Water evaporation in concrete increased with decreasing external RH, and an obvious increase in the surface chloride content may be observed when external RH was 50%; however, when external RH was above 75%, the inner chloride content increased and surface chloride content decreased with increasing exposure duration. Simulating the chloride penetration under wet-dry cycling, the water migration resulted in an increase in the surface chloride content and a decrease in the inner chloride content, and the chloride crystal precipitated on the surface of concrete with a high w/c ratio.

show abstract

Comparison of Mercury Intrusion Porosimetry and multi-scale X-ray CT on characterizing the microstructure of heat-treated cement mortar

Cited by 69 publications

References 61 publications

Experimental and Statistical Study on Mechanical Characteristics of Geopolymer Concrete

Experimental and Statistical Study on Mechanical Characteristics of Geopolymer Concrete

Effective Utilization of Waste Glass as Cementitious Powder and Construction Sand in Mortar

Chloride Penetration into Concrete under the Coupling Effects of Internal and External Relative Humidity

Contact Info

Product

Resources

About