Hydration kinetics of high-strength concrete with untreated coal bottom ash for internal curing

2018 ◽  
Vol 91 ◽  
pp. 67-75 ◽  
Author(s):  
H.K. Kim ◽  
H.K. Lee
Keyword(s):  
High Strength Concrete ◽  
Bottom Ash ◽  
High Strength ◽  
Internal Curing ◽  
Hydration Kinetics ◽  
Coal Bottom Ash ◽  
Strength Concrete ◽  
Kinetics Of

The mechanical properties and heat development behavior of high strength concrete containing high fineness coal bottom ash as a pozzolanic binder

2020 ◽  
Vol 253 ◽  
pp. 119239 ◽  
Author(s):  
Penpichcha Khongpermgoson ◽  
Kamonrat Boonlao ◽  
Natthasing Ananthanet ◽  
Thanaphon Thitithananon ◽  
Chai Jaturapitakkul ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Strength Concrete ◽  
Bottom Ash ◽  
High Strength ◽  
Coal Bottom Ash ◽  
Strength Concrete ◽  
Heat Development

scholarly journals Strength Properties of High-Strength Concrete Containing Coal Bottom Ash as a Replacement of Aggregates

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
In-Hwan Yang ◽  
Jihun Park ◽  
Nhien Dinh Le ◽  
Sanghwa Jung
Keyword(s):  
Compressive Strength ◽  
High Strength Concrete ◽  
Bottom Ash ◽  
High Strength ◽  
Ultrasonic Pulse Velocity ◽  
Strength Properties ◽  
Pulse Velocity ◽  
Coal Bottom Ash ◽  
Strength Concrete ◽  
Fine Aggregates

Most previous studies on the strength properties of coal bottom ash (CBA) concrete have focused on concrete with a normal compressive strength, and thus, studies on the strength properties of high-strength concrete (HSC) containing CBA are limited. Therefore, the effects of replacing fine aggregates with CBA and variations in the curing age on the strength properties of HSC with a compressive strength of greater than 60 MPa were investigated in this study. The different CBA contents included 25, 50, 75, and 100%, and the different curing ages were 28 and 56 days. The mechanical properties of the HSC with CBA incorporated as fine aggregates were examined. The experimental results revealed that CBA could be partially or totally substituted for fine aggregates during HSC production. The test results also showed that the compressive, splitting tensile, and flexural strengths of the HSC containing CBA fine aggregates slightly decreased as the CBA content increased. Moreover, useful relationships between the compressive strength, splitting tensile strength, and flexural strength were suggested, and the predictions reasonably agreed with the measurements. Compared to those of the control specimen, the pulse velocities of the HSC specimens at various CBA contents decreased by less than 3%. In addition, equations for predicting the strength values of CBA concrete by using the ultrasonic pulse velocity were suggested.

scholarly journals Calculation Model for the Mixing Amount of Internal Curing Materials in High-strength Concrete based on Modified MULTIMOORA

2020 ◽  
Vol 27 (1) ◽  
pp. 455-463
Author(s):  
Lixia Guo ◽  
Minghua Wang ◽  
Ling Zhong ◽  
Yanan Zhang
Keyword(s):  
High Strength Concrete ◽  
High Strength ◽  
Calculation Model ◽  
Internal Curing ◽  
Total Water ◽  
Water Release ◽  
Strength Concrete ◽  
Numerical Example ◽  
Comprehensive Performance ◽  
Mixing Method

AbstractThe internal curing technology has been widely applied to high-strength concrete, for it can make the high-strength concrete marked by low shrinkage and durable frost resistance. The key to its extension and application lies in the reasonable mixing amount of internal curing materials. To address this problem, scholars have proposed a method for determining the water demand in internal curing; however, the water release of internal curing materials is difficult to obtain by measurement due to the mixing method. Therefore, this paper proposed a calculation model for the mixing amount of internal curing materials based on the modified MULTIMOORA method (Multi-Objective Optimization on the basis of Ratio Analysis plus full multiplicative form). First, different internal curing materials (super absorbent polymer (SAP), lightweight aggregate (LWA)) and pretreatment methods were selected to calculate their compressive strength, self-shrinkage and frost durability according to a proposed test scheme on the mixing amount of internal curing materials, and in such case, the comprehensive performance evaluation of the above indexes was turned into a multi-attribute decision-making problem. Second, the ordered weighted averaging (OWA) method and the entropy weight method were used to determine the subjective and objective weights of the indexes respectively, to eliminate the impact of outliers in the subjective evaluation values. Finally, the comprehensive performance of each test group was sorted using MULTIMOORA, and based on the sorting results and the calculation model, the mixing amount of internal curing materials was determined. The numerical example application results showed that the mixing amount of SAP curing material calculated based on the model herein was 1.276 kg/m3, and the mixing method adopted the pre-water absorption method with the total water-binder ratio unchanged. The numerical example evaluation results were in good agreement with the test results. The internal curing effect of SAP was better than that of LWA, and reached the best when the mixing amount was calculated at 25 times the water release rate and the requirement for the maximum total water diversion was met. The study may provide new ideas for extension and application of the internal curing technology.

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