Mortars with water/cement ratio of 0.4, MLG dosage varying from 0.015 to 0.033% by weight of cement and sand at a proportion of 3× the weight of cement were prepared. 50 × 100 mm cylindrical ...

2.1. Experimental Models. A total of 39 concrete samples were fabricated for laboratory tests (Three samples from each mixture for control). The composition and nomenclature of hybrid concrete samples (combination of different fibers) and an overview of their characteristics and nomenclature were presented in Fig. 1 and Table 1.In this …

This paper investigates the use of alkali-activated mortar for tunnel-lining structure repair. First, the effects of NaOH concentration and ordinary portland cement (OPC) content on the fresh and hardened states of alkali-activated repair mortar (ARM) were studied by investigating its setting time and compressive strength.

The application of artificial neural networks in mapping the mechanical characteristics of the cement-based materials is underlined in previous investigations. However, this machine learning technique includes several major deficiencies highlighted in the literature, such as the overfitting problem and the inability to explain the decisions. …

The compressive strength of cement-based mortars is predicted based on six input parameters, i.e., the age of specimen (AS), the cement grade (CG), the metakaolin-to-total-binder ratio (MK/B), the ...

The most commonly used and accepted mortar strength test for determining the compressive strength of mortar is the astm c109 compressive strength test of …

5 Page 5. Manhole Rehabilitation… B. NOTE 1—this dry, powdered admixture produces a dense cementitious liner with improved compressive and flexural strength, high adhesion to damp surfaces, lower permeability and increased …

A multi-scale experimental study was carried out to investigate the porosity, flexural and compressive strengths of cement-mortar at different cement strength classes (CSCs). Specifically, 54 mix designs (totally 324 specimens) were first defined and then the produced cement-mortar specimens were tested to consider their properties. …

Portland Cement Compressive Strength. The most common strength test, compressive strength, is carried out on a 50 mm (2-inch) cement mortar test specimen. The test …

The results revealed that the electrical resistivity decreased and compressive strength increased with increasing the content of the conductive fillers, and response surface analysis results ...

The compressive strength of concrete varies from 2500 psi (17 MPa) to 4400 psi (30 MPa) for general residential and commercial constructions and several applications also use strengths greater than 10,000 psi (70 MPa) in certain commercial and industrial constructions. ... To provide for a uniform load distribution when testing, cylinders are ...

In addition, the results demonstrated and described the negative effect of shrinkage reducing admixtures on the compressive strength of cement mortar lining. The tested dosages of the used shrinkage reducing admixtures showed that they can reduce the drying shrinkage of a mix by 7.5 and 29.1%, decrease its compressive …

Compressive strength is one of the most important properties of concrete and mortar. The strength of the binder (cement) therefore has a significant effect on the performance characteristics of the mixture and ensures the overall quality of the finished product. The test for compressive strength is generally carried out by crushing cubes …

Type O Mortar: With low compressive strength, this type is used primarily for interior and non-load-bearing applications. ... Step 6: Check the Consistency. The ideal consistency for bricklaying mortar is akin to a thick paste or creamy peanut butter. It should be moist enough to bond to the bricks and trowel but firm enough to hold its shape ...

The compressive strength of concrete with blend containing 59% Cement 15% Metakaolin and 26% Alccofine has achieved maximum packing density and also the flexural strength of the beam has increased ...

Download scientific diagram | Compressive and flexural strength values for cement mortar (MPa). from publication: Compressive and Flexural Strength of High-Volume Fly Ash Mortars Aged with Air ...

The following is the compressive strength of concrete formula, Compressive Strength = Load at failure / Cross-sectional Area of element. IS Code For Concrete Cube Test: Cube Test of Concrete as per IS Code IS 516 (1959): Method of Tests for Strength of Concrete and IS 456 2000: Concrete Strength Acceptance …

See that mixers are free of accumulations of hard concrete or mortar. Check that truck mixers have the required metal plates containing the specified information. ... When concrete has a described 28-day compressive strength greater than 3,600 psi or a minimum concrete compressive strength is specified as a prerequisite to applying …

The slope can represent the increasing rate of compressive strength with age. The slopes of C0, C1, and C2 were 16.753, 13.822, and 14.288, respectively, indicating that the …

Compressive strength testing of mortar specimens, such as that used during the trial-and-error development of the mix and preconstruction and construction evaluations, …

8.3 Compressive strength of cement mortar lining. 8.4 Ring bending test for mortar disbonding check. 8.5 Appearance of lining. Figures. Tables? Redlines ? Foreword. ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is ...

Only mix R2 (10% rice straw ash) was selected in the present investigation because it was concluded in the previous study [16] that the compressive strength of the mortar rises to only 5% ...

The compressive strength of concrete is the most important and useful property. Cement is planned to withstand compressive strength. If it fails then it will ultimately fail the structure. Compressive strength tests give assurance to use. ... Immediately after mixing the mortar in accordance with step 1 & 2, place the mortar in the cube mould ...

Asteris et al. (2021) adopted artificial neural network to predict the compressive strength of cement mortar. Pu et al ... SVR-QPSO, ELM-QPSO, and RF-QPSO) were built for the advanced prediction of the compressive strength of sprayed concrete lining in tunnel engineering. The main conclusions were made as follows: (1) …

Strength is the most important property of cement. The compressive strength test of cement is done because, with an increase in compressive strength of cement strengths such as flexural strength, resistance to abrasion, and so on also increases.With one test we can determine various aspects of cement and can decide the suitable types of …

The aim of the compressive strength test is to find the compressive strength of standard cement sand mortar cubes, and of the tensile test is to find the …

Compressive strength is a test routinely used to measure the end performance of hardened mortar. It is applicable for production control, performance and compliance …

The following will provide the information exist in ASTM C109 on how to determine the compressive strength of mortar cubes having a size of 50 mm × 50 mm × 50 mm. ... (Compressive Strength of Hydraulic Cement Mortars) 500 grams (0.5 kg) of portland cement; 1375 grams (1.375 kg) of sand ... Check the cube surfaces with a …

performed. This Lab manual mainly deals with the common and universal laboratory tests of. different types of construction materials. Normal consistency and initial setting time. …

The common pathology oftenly observed in the water-supplying steel pipes is cracking and delaminating the cement based internal lining [].Thus, the quick in-situ repair of these defects is essential for preventing the possible steel corrosion in pipes [2,3,4].The implemented repair mortar must meet the sanitary norms regarding the chemical …