Variation of Durability and Strength Parameters of Pumice Based Mixtures

Abstract

The numerical modelling of chloride penetration into concrete is very sensitive to the correct description of the input data. In the recent era, high-performance concrete (HPC), which combines Portland cement and other supplementary cementitious materials, has been gaining attraction due to their desirable material properties and durability. The presented results show the application of the modified approach for the evaluation of the suitability of the time-dependent model for the variation of the diffusion coefficient. The 26 various binary and ternary-based concrete mixtures blended with volcanic pumice pozzolan (VPP) as a major supplementary cementitious material (SCM) are compared with the reference Ordinary Portland Cement mixture. Other SCMs namely fly ash, slag, silica fume, and metakaolin were also utilized in ternary-based concrete mixtures. In-depth statistical analysis was carried out to show the variability and effects of the amount of the volcanic pumice as an SCM on the diffusion coefficient. The mean value and regression via linear approximation of the time-dependent coefficient of variation of the diffusion coefficients were used as well as the Root of Mean Squared Error approach. The presented results are suitable as the component of the input parameters for the durability-related probabilistic assessment of the reinforced concrete structures exposed to chlorides. In addition, the time-dependent ultimate limit state-related data was presented.

Durability Improvement of Pumice Lightweight Aggregate Concrete by Incorporating Modified Rubber Powder with Sodium Silicate

“…Pumice concrete is widely used in current civil construction, making it more economical and reasonable for people, but the use of pumice concrete in a large area needs theoretical support and practical verification. Its engineering application value is that it can be added to concrete to play a skeleton role, which is widely used in the production of pumice lightweight aggregate concrete (PLAC) [1]. When the pre-wet pumice replaces the coarse aggregate by 30~40%, the PLAC processed has the advantages of low density, good compressive strength, split tensile strength, and flexural strength, which obviously improves the dynamic performance of the interfacial transition zone (ITZ) [2][3][4][5].…”

Concrete Strength Prediction Using Different Machine Learning Processes: Effect of Slag, Fly Ash and Superplasticizer

“…Although improving cement manufacturing technologies can help to reduce emissions [ 4 ], studies have increasingly shown that using alternative materials might be a more accessible and sustainable approach [ 2 ]. Therefore, with the proposal of the new concept of national green development of China and the increasing focus on simultaneously achieving both healthy living environments and development, green building materials are becoming more widespread in their use, especially solid waste produces such as blast furnace slag (BFS) and fly ash (FA), which are used as partial replacements to Portland cement [ 5 ].…”

The Realization of Clinker-Reduced, Performance-Based Sustainable Concrete by the Micro-Filler, Eco-Filler Concept

“…Such a restriction is also reported for fly ash use in some countries [ 9 , 10 ]. Therefore, the exploration of alternative SCMs and their appropriate use in blended binders is becoming increasingly important, especially those that improve durability properties such as chloride penetration resistance [ 11 ]. However, in the present paper, combinations of CEM I and different, actually available SCMs and fillers are presented in order to achieve a significant CO 2 -reduction in construction practice already today.…”