## effect of watercement ratio on pore structure and

## The Pore Structure of Phosphoaluminate Cement

The effects of curing time and water-to-cement ratio (W/C) on the pore structure of phosphoaluminate cement (PAC) paste are here presented. Based on the adsorption and condensation theory, the adsorption isotherm of hardened paste was tested using the Brunauer-Emmett-Teller (BET) nitrogen adsorption method. The phase composition and morphology of hydration products cured at

Get Price## The fractal characteristics of pore size distribution in ...

Nov 20, 2019 The pore surface fractal dimensions of the visible pores are larger than those of the micropores, and there is an inverse relationship between the pore

Get Price## Effects of SAP on the properties and pore structure of ...

Abstract Water-to-binder ratio (w/b) directly affects the pore structure and performance of concrete, and drying conditions enhance the influence of water-to-binder ratio. Superabsorbent polymer (SAP) is effective to adjust the water in the concrete. In this paper, the effect of SAP and extra water on drying shrinkage, pore structure and the permeability of high performance cement-based ...

Get Price## Effects of water–cement ratio and curing time on the ...

Mar 01, 2009 The only remaining continuous pores after a long curing time are the pores in the cement gel phase. Since the structure of the gel is independent of the water–cement ratio, the effect of the water–cement ratio on the critical pore width vanishes. The line for the specimens with the age of 365 days is fairly parallel to the x-axis.

Get Price## Effective Absorption Capacity Examined by Isothermal ...

Jun 24, 2020 The second part investigates the effect of the water-to-cement ratio of the paste on the effective water absorption capacity. 2.2.1. Part 1: Investigation into Pore Structure. In the first part of the study, the two materials with different pore structures, ACF and PAC, were used to study the influence of their pore structure on EAC.

Get Price## The fractal characteristics of pore size distribution in ...

Nov 20, 2019 Many factors are closely related to the pore structure of cement-based materials, such as the water-cement ratio 7,8,9, curing conditions 10,11 and mineral admixtures 12,13, and mechanical effects ...

Get Price## Effect of Phenolic Particles on Mechanical and Thermal ...

Foamed concrete materials based on sulpoaluminate cement were prepared by the chemical foaming method. The effects of water-cement ratio, foaming agent, and foaming stabilizer on the mechanical and thermal properties of foamed concrete were studied. Meanwhile, a portion of

Get Price## Microstructure and pore structure of polymer-cement ...

Jan 14, 2021 The effects of cement ratio on the pore structure of joint sealants basically exhibit identical trends. With increase in cement ratio (CR1 → DZ → CR2), the total pore

Get Price## Quantitative Analysis of Relationship Between Pore ...

Mar 19, 2018 The effect of dry density, water-cement ratio, the addition of fly ash, and sand content on the porosity and pore distribution of foamed concrete is investigated. Digital microscopy and Image J software are employed to examine the landscape of pores with different sizes. Based on the Balshin empirical formula, a mathematical model is established to quantitatively predict the relationship ...

Get Price## Water to Cement Ratio Effect on Cement Paste ...

Jul 18, 2021 The effect of the water-to-cement ratio on cement paste microstructural development was investigated using electrical resistivity measurements and computer modelling. Three cement pastes with 0.3, 0.35, and 0.4 w/c ratios were used in this study. The electrical resistivity measurements curve as a function of time for the three pastes shows that the lower the w/c ratio the higher the electrical ...

Get Price## Influence of Water Cement Ratio and Curing on the ...

Curing affects sincerely the durability of concrete especially in surface regions. This is reflected in the pore structure and in the permeability. In a systematic research the structural changes due to water cement ratio and curing have been studied by mercury porosimetry, by nitrogen adsorption, by oxygen diffusion and by oxygen permeability.

Get Price## Effect of dry–wet ratio on pore-structure characteristics ...

Apr 19, 2021 At present, a unified sulfate dry–wet cycle system has not been found, different researchers use various dry–wet cycle methods, and the research results are often difficult to systematize. In this study, dry–wet time ratios of 1:1, 3:1, 5:1, and 7:1 were employed to investigate the effect of sulfate drying–wetting cycles on the pore-structure characteristics of concrete. The wetting ...

Get Price## [PDF] New Strength Model Based on Water-Cement Ratio and ...

This paper presents a new mathematical model that includes the effects of w/c ratios and capillary porosity that was left out in the Abrams formula. Basically, the capillary pores are remnants of water-filled space in between the partially hydrated cement grains, and the gel pores are formed within C-S-H gels, the primary products of hydration. This physiochemical behavior enables us to ...

Get Price## CiteSeerX — Effect of Water-Cement Ratio on Abrasive ...

The water-cement ratio is one of the key factors effecting on concrete properties. Abrasive resistance, porosity, efficiency and like all are directly or indirectly affected by the above parameters. In engineering work the underlying assumption is the fact that the compressive strength of the concrete gained on a specific temperature depends on ...

Get Price## Effect of Water Cement Ratio on Strength of Concrete – we ...

Oct 06, 2017 EFFECT OF WATER CEMENT RATIO ON CONCRETE. A lower ratio leads to higher strength and durability, but may make the mix difficult to work with and form. Work-ability can be resolved with the use of plasticizers or super-plasticizers. However, a mix with a ratio of 0.35 may not mix thoroughly, and may not flow well enough to be placed.

Get Price## The Influence of Water/Binder Ratio on the Mechanical ...

Analysing the w/b ratio used, it could be numerically presented that this ratio is a composition of a water/lime ratio as of the reference specimen (0.875), and a standard water/cement ratio of 0.5. Concerning this and the amount of WPC added to each specimen, the final w/b ratio was as presented in Table 2. Results from Series 2, in regard to ...

Get Price## The Effect of Lightweight Aggregate Water Absorption on ...

The effect of lightweight aggregate water absorption on the ... The water-cement ratio is deemed to be one of the most important factors deciding the strength and durability of hardened structural concrete. It is easy to establish the ratio value as long as the aggregate cannot absorb mixing ... depending on the aggregate pore structure ...

Get Price## Effect of Water-Cement Ratio on the Compressive Strength ...

observed that a water-cement ratio of less than 0.6 shall give better corrosion resistance with increased compressive strength. In their study of the effect of different mix ratios and water cement ratios on sulphate attack on concrete, Ahmad and Shabir (2005) conclude that lean mixes were more affected than the richer ones; that concretes with the

Get Price## The Effect of Pore Structure and Water Absorption on ...

Researched the influence of the pore structure and water absorption on the carbonization property with sulphoaluminate foamed cement as an example. The results showed that: Under the same levels of dry density, the smaller pore size, the higher the carbonation coefficient and the integrity of pore had the same effect. After the surface water-proofing, water absorption decreased by 10% on ...

Get Price## (PDF) Effects of drying and freeze/thaw cycling probed by ...

Capillary pores which originates from excess water not taking direct part in the hydration, i.e. only present at water/cement-ratios (w/c) above about 0.40. Although later work (2) based on mercury intrusion porosimetry (MIP), gas adsorbtion and freeze calorimetry indicate that the pore size distribution is continuous, the model of Powers and ...

Get Price## Effect of Water to Cement Ratio on Autogenous Shrinkage of ...

Jan 02, 2014 Abstract: The autogenous shrinkage of pavement concrete with different water to cement ratios are measured in an experimental setup, and these samples' gradation and pore structure characteristics are analyzed by a mercury intrusion method and an optical microscope with the Image Pro-Plus software package.The autogenous shrinkage model of pavement concrete with 0.38-0.44 water to cement ratio ...

Get Price## Research Article Effect of Water-Cement Ratio on Pore ...

Effect of Water-Cement Ratio on Pore Structure and Strength of Foam Concrete ZhongweiLiu, 1,2 KangZhao, 1 ChiHu, 2 andYufeiTang 1 Department of Materials Science and Engineering, Xi an University of Technology, Xi an , China Sichuan College of Architectural Technology, Deyang , China Correspondence should be addressed to Kang Zhao; [email protected] ...

Get Price## [PDF] Effect of Water-Cement Ratio on Pore Structure and ...

Effects of the water-cement ratio on the relative viscosity of the cement paste, as well as pore structure and strength of the hardened foam concrete, were discussed. Results showed that water-cement ratio can influence the size, distribution, and connectivity of pores in foam concrete.

Get Price## Importance of Water-Cement Ratio in Concrete

Nov 14, 2018 For workability consideration, this water-cement ratio is found as 0.4, but its selection depends on the requirement of workability in different exposure conditions and nature of work. At a water-cement ratio of 0.4, the mix has sufficient water for hydration as well as for providing ease in the concreting process like mixing, placing, transporting and compacting.

Get Price## (PDF) Effect of Water-Cement Ratio on Pore Structure and ...

Effects of the water-cement ratio on the relative viscosity of the cement paste, as well as pore structure and strength of the hardened foam concrete, were discussed.

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