English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

To explore the effect of composite powder material on the frost resistance of concrete to improve the comprehensive performance of concrete, and to improve the stability and safety of the building has an important role. In this study, the influence mechanism of the composite powder material on the frost resistance of concrete is analyzed. The results show that the frost resistance of C30 concrete is the best and the internal structure is more dense, in order to provide reference and reference for the related people. 1. Preface With the rapid pace of urbanization, the construction industry presents a rapid development momentum, the number of construction waste is also increasing, at the present stage, the use of construction waste is mainly concentrated on recycled cementitious materials and cement. The investigation shows that the recycled concrete with building waste composite powder has poor frost resistance, and the anti permeability performance is lower than that of ordinary concrete. Based on this, this study analyzes the influence of construction waste composite powder material on frost resistance of concrete. 2. Experimental Materials and Schemes 2.1 Experimental materials In this study, the common silicic acid cement was used as the main experimental material. The common river sand and gravel of A gravel field were collected as building garbage. The composition of composite powder material of construction waste was shown in Table 1. Through the analysis of the composition of the experimental materials used in this study, it is found that the architectural gravel is mainly composed of SiO2, CaO, Na2O, Al2O3, Fe2O3, MgO, K2O, LOI and SO3. Among them, the content of calcium oxide is relatively low, which is also the main reason for reducing the activity of construction waste dust. The composition of SiO2 is relatively high, considering that there are a lot of glassy slag in construction waste. The composition ratio of Al2O3 is relatively high, which indicates that construction waste has certain hydration activity. Table 2 shows that the particle gradation of building debris is poor and the distribution of texture is uneven. This is also an important reason for reducing the activity of dust in construction waste. The physical properties and chemical composition of building waste materials are shown in Table 2 and table 3 respectively. Table 1 Composition of composite powder material for building waste Constituent elements SiO2 CaO Al2O3 Fe2O3 MgO constituent ratio 50.04 0.94 18.64 3.07 1.67 Constituent elements Na2O K2O LOI SO3 constituent ratio 0.02 3.34 3.69 0.21 2018 International Conference on Medicine, Biology, Materials and Manufacturing (ICMBMM 2018) Copyright © (2018) Francis Academic Press, UK 345 Table 2 physical indicators of composite materials for construction waste Physical index Loss of burning (%) Surface area (m/kg) Density (kg/m) Water consumption of standard consistency (%) Particle size (μ m) measured value 4.58 429 2.91 0.293 7-15 Table 3 chemical composition of composite materials for construction waste Constituent elements Fe2O3 CaO Al2O3 SiO2 constituent ratio 2.56-3.38% 22.64-25.97% 15.28-17.66% 43.69-36.41% 2.2 Experimental scheme The combination of this test, as shown in table 4, shows that the output of the powder material is 35%, 45% and 55%, the sand content is 36%, the weight of the cement is 260kg, the weight of the powder material is 121kg, the weight of the gravel and sand is 1304kg and 652kg, and the weight of the water is 168kg. At the same time, in the process of experiment, the frost resistance of concrete under different salt concentration was investigated by using Sodium Chloride Solution with concentration of 2.5, 3.5 and 4.5% respectively. Table 4 C30 concrete mix ratio Water cement ratio (%) Content of powder material (%) Sand content (%) Material amount (kg/m) water cement Gravel Sand Powder material 0.51 20,30,40, 35 168 26

Study on the Influence of Construction Waste Composite Powder Material on Frost Resistance of Concrete