Experimental Study on Durability Improvement of Fly Ash Concrete with Durability Improving Admixture

Abstract

In order to improve the durability of fly ash concrete, a series of experimental studies are carried out, where durability improving admixture is used to reduce drying shrinkage and improve freezing-thawing resistance. The effects of durability improving admixture, air content, water-binder ratio, and fly ash replacement ratio on the performance of fly ash concrete are discussed in this paper. The results show that by using durability improving admixture in nonair-entraining fly ash concrete, the compressive strength of fly ash concrete can be improved by 10%–20%, and the drying shrinkage is reduced by 60%. Carbonation resistance of concrete is roughly proportional to water-cement ratio regardless of water-binder ratio and fly ash replacement ratio. For the specimens cured in air for 2 weeks, the freezing-thawing resistance is improved. In addition, by making use of durability improving admixture, it is easier to control the air content and make fly ash concrete into nonair-entraining one. The quality of fly ash concrete is thereby optimized.

Neural network based hygrothermal prediction for deterioration risk analysis of surface-protected concrete façade element

“…This parameter can explain the effect of air-entraining admixtures as they heavily controlled it. The finding of air-entraining admixtures as influential descriptor is complemented by earlier researches [145,146]. These researches were made on concrete specimens of different mix compositions exposed to indoor and outdoor environments.…”

“…In fact, there are few studies that demonstrate the effect of different types of plasticizers in improving the carbonation resistance of concrete through their influence on the pore structure and the morphology of the hydrated product [143,144]. Other studies show the impact of air content on carbonation process by conducting experiment on air-entrained concrete [145,146]. According to the studies, air-entraining admixtures increase the carbonation resistance of concrete.…”

Engineering Mathematical Analysis Method for Productivity Rate in Linear Arrangement Serial Structure Automated Flow Assembly Line

“…The final stage of engineering mathematical analysis method is sustainable improvement. This stage presents the meaning of the improvement step or solution that can be applied for long term application and long term improvement [17]. Since there are a lot of parameters causing the losses of productivity rate in final assembly automated line, PACE prioritization matrix is introduced to select which parameters are preferred to be improved and which (parameters) are suggested to be maintained [18].…”

Compressive and flexural behavior of glass fiber-reinforced concrete

“…Using of fly ash reduces the cost of cement, reduces CO2 [3] and develops the compressive strength of concrete [4]. To obtain high strength concrete, silica fume along with fly ash can also be added so that there will be change in the properties of concrete such as workability, curing and strength [5][6][7].…”