Effects of cement type, water/cement ratio and cement content on sea water resistance of concrete

2007 ◽  
Vol 42 (4) ◽  
pp. 1770-1776 ◽  
Author(s):  
Hüseyin Yiğiter ◽  
Halit Yazıcı ◽  
Serdar Aydın
Keyword(s):  
Water Resistance ◽  
Sea Water ◽  
Cement Content ◽  
Cement Type ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Type Water

The Quest for Absolute Concrete Durability Performance Criteria

2016 ◽  
Vol 711 ◽  
pp. 599-606
Author(s):  
Geert de Schutter
Keyword(s):  
Cement Content ◽  
Performance Criteria ◽  
Concrete Durability ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
The Real ◽  
Binder Type ◽  
Maximum Water ◽  
Standard Solution ◽  
Durability Performance

Deemed-to-satisfy durability requirements, as typically provided in code prescriptions (minimum cement content, maximum water cement ratio, minimum strength class) are now approaching their limits of applicability. With the implementation of new tailor-made binder types, including a multitude of powders (reactive and even non-reactive), the prescriptive parameters cement content and water/cement ratio become unclear and do not always correlate well with the real durability performance. While the equivalent concrete performance concept (ECPC) already offers a first way out of this debate, it still fundamentally maintains durability requirements at a deemed-to-satisfy level, as the new binder type needs to be experimentally calibrated relative to a standard solution. A more fundamental solution needs to consider the absolute durability performance of the concrete applied in the real structure. This performance needs to be evaluated in laboratory conditions (potential performance) as well as on the final structure (as-built performance). However, although straightforward in principle, the quest for absolute durability performance criteria is complicated, with remaining fundamental obstacles. This paper intends to give a general overview.

Laboratory Experimental Research on Mix Ratio Test of Cement Soil

2013 ◽  
Vol 438-439 ◽  
pp. 197-201
Author(s):  
Xian Hua Yao ◽  
Peng Li ◽  
Jun Feng Guan
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Unconfined Compressive Strength ◽  
Cement Content ◽  
Ratio Test ◽  
Curing Time ◽  
Curing Conditions ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Cement Soil

Based on the generalization and analysis of laboratory experimental results on mix ratio, the effects of various factors such as cement content, water-cement ratio, curing time, curing conditions and types of cement on the mechanical properties of unconfined compressive strength of cement soil are presented. Results show that the unconfined compressive strength of cement soil increases with the growing curing time, and it is greatly affected by the cement content, water-cement ratio, cement types and curing time, while the effect of curing conditions is weak with a cement content of more than 10%. Moreover, the stress-strain of the cement soil responds with the cement content and curing time, increasing curing time and cement content makes the cement soil to be harder and brittle, and leads to a larger Young's modulus.

scholarly journals Study on the Strength and Micro Characteristics of Grouted Specimens with Different Superfine Cement Contents

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6709
Author(s):  
Dongyue Zhang ◽  
Zhenqian Ma ◽  
Yihuai Zou ◽  
Hongfei Xie ◽  
Ruichong Guan
Keyword(s):  
Compressive Strength ◽  
Fractal Dimension ◽  
Cement Content ◽  
Uniaxial Compression Test ◽  
Injection Test ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Grouting Material ◽  
Comprehensive Performance ◽  
Scanning Electron

To provide the most effective comprehensive performance grouting material ratio, in this experimental investigation, a total of eight grouted specimens with two water-cement ratios (0.45:1, 0.55:1) and four different superfine cement contents (0%, 30%, 70%, 100%) were evaluated. Based on a uniaxial compression test, the fractal dimension of the fragments, a mercury injection test, and scanning electron microscopy, the effects of the superfine cement content on the strength characteristics and microscopic characteristics of the grouted specimens were studied. The results showed that increasing the superfine cement content could enhance the compressive and tensile strength of the grouted specimens and reduce the fractal dimension of the fragments and the porosity of the grouted specimens. The superfine cement content increased from 0% to 70% when the water-cement ratio was 0.45:1. The compressive strength of the grouted specimens increased from 16.7 MPa to 26.3 MPa, and the fractal dimension decreased from 1.8645 to 1.2301. When the water-cement ratio was 0.55:1, the compressive strength of the grouted specimens increased from 10.5 MPa to 20.6 MPa, and the fractal dimension value decreased from 2.2955 to 1.4458. When the superfine cement content increased from 0% to 100%, the water-cement ratio was 0.45:1. The porosity of the grouted specimens was reduced from 28.41% to 21.62%. When the water-cement ratio was 0.55:1, the porosity of the grouted specimens was reduced from 33.33% to 29.46%.

Study on the Coexistence of Porous Ecological Concrete with Plants

2011 ◽  
Vol 311-313 ◽  
pp. 1551-1554 ◽  
Author(s):  
Hong Zhu Quan
Keyword(s):  
Cement Paste ◽  
Cement Content ◽  
Aggregate Gradation ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Concrete Blocks ◽  
Paste Content

The effects of mix proportions on the properties of porous ecological concrete, and its coexistence with plants are discussed in this paper. In conclusion, the strength of porous ecological concrete is governed simultaneously by water cement ratio and cement content. Permeability is increased with any increment in aggregate gradation and any decrease in cement paste content. The thicknesses of concrete blocks and topsoil affect the growth of plants.

Experimental Study on Engineering Performance of Portland Cement Stabilization of Soil-Bentonite

2011 ◽  
Vol 179-180 ◽  
pp. 978-982
Author(s):  
Xiao Yong Li ◽  
Zhi Gang Zhang
Keyword(s):  
Hydraulic Conductivity ◽  
Portland Cement ◽  
Cement Content ◽  
Expansion Ratio ◽  
Wall Material ◽  
Experimental Program ◽  
Compression Tests ◽  
Unconfined Compression ◽  
Cement Ratio ◽  
Water Cement Ratio

Slurry trench cutoff walls, constructed using self-hardening cement-bentonite (SCB) are the most common form of in-ground vertical contaminant barrier in the world, and are increasingly being used in China. As a kind of vertical anti-seepage wall material， SCB slurry is requently used for the containment of contaminated groundwater and other envirofunental Protection Projeets abroad. Domestie applieation of cement-bentonite slurry walls is not extensive. The objective of this study was to evaluate the effect of water-cement ratio and cement content on the hydraulic behavior of SCB and soil–bentonite (SB) mixtures permeated with water. The experimental program included unconfined compression tests, expansion ratio tests and hydraulic conductivity tests. The test results indicated changes in hydraulic conductivity take place due to the variation of the water-cement ratio and permeant fluid. Cement is a main material in effecting the CSB strength of unconfined compression. Cement greatly influenced the CSB permeability coefficient. Addition of Portland cement to the SB mixtures increased their hydraulic conductivity when permeated with water. The hydraulic conductivity of the SCB specimens permeated with water was inversely related to the cement content.

Sulfate attack monitored by microCT and EDXRD: Influence of cement type, water-to-cement ratio, and aggregate

2006 ◽  
Vol 36 (1) ◽  
pp. 144-159 ◽  
Author(s):  
N.N. Naik ◽  
A.C. Jupe ◽  
S.R. Stock ◽  
A.P. Wilkinson ◽  
P.L. Lee ◽  
...  
Keyword(s):  
Sulfate Attack ◽  
Cement Type ◽  
Cement Ratio ◽  
Water To Cement Ratio ◽  
Type Water

scholarly journals Applications of Gene Expression Programming and Regression Techniques for Estimating Compressive Strength of Bagasse Ash based Concrete

Crystals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 737 ◽  
Author(s):  
Muhammad Faisal Javed ◽  
Muhammad Nasir Amin ◽  
Muhammad Izhar Shah ◽  
Kaffayatullah Khan ◽  
Bawar Iftikhar ◽  
...  
Keyword(s):  
Gene Expression ◽  
Compressive Strength ◽  
Linear Regression ◽  
Cement Content ◽  
Gene Expression Programming ◽  
Contributing Factors ◽  
Literature Study ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Using Data

Compressive strength is one of the important property of concrete and depends on many factors. Most of the concrete compressive strength predictive models mainly rely on available literature data, which are too simple to consider all the contributing factors. This study adopted a new approach to predict the compressive strength of sugarcane bagasse ash concrete (SCBAC). A vast amount of data from the literature study and fifteen laboratory tested concrete samples with different dosage of bagasse ash, were respectively used to calibrate and validate the models. The novel Gene Expression Programming, Multiple Linear Regression and Multiple Non-Linear Regression were used to model SCBAC compressive strength. The water cement ratio, bagasse ash percent replacement, quantity of fine and coarse aggregate and cement content were used as an input for models development. Various statistical indicators, i.e., NSE, R2 and RMSE were used to assess the performance of the models. The results indicated a strong correlation between observed and predicted values with NSE and R2 both above 0.8 during calibration and validation for the Gene Expression Programming (GEP). The outcomes from GEP outclassed all the models to predict SCBAC compressive strength. The validity of the model is further verified using data of fifteen tests conducted in the laboratory. Moreover, the cement content in the mix was revealed as the most sensitive parameter followed by water cement ratio form sensitivity analysis. The GEP fulfilled all the criteria for external validity. The simple formulae derived in this study could be used reliably for the prediction of SCBAC compressive strength.

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