An experimental study of the in situ spraying mortar was carried out to determine the compressive strength, flexural strength and interface properties (splitting tensile strength and shear ...
Consequently, in this study, a hydro-mechanical coupling test on shaft lining concrete was conducted under triaxial compression conditions to derive a normalized strength attenuation equation for shaft lining concrete.
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 tensile strength also of standard cement sand mortar cubes.
Fire Bricks – Properties, Types and Uses. A fire brick is a special type of brick made using fire clay and has a good resistance against high temperatures which are used in kilns, lining furnaces, fireplaces and fireboxes. These bricks are manufactured in a way similar to that of normal bricks, except during the burning process- Fire bricks ...
Download scientific diagram | Relationship between P-wave velocity and compressive strength of mortar lining specimen at each curing time from publication: Effect of blast-vibration on the ...
A second-order regression model of compressive strength recovery rate and tensile strength recovery rate of concrete was established. Based on these results, the positive synergistic effect of CCCW and PF in concrete self-healing process was revealed by response surface analysis.
A relationship between the physical and mechanical properties of the modified cement mortars at P/C below 10% is found; that is, the compressive strength and flexural strength of the modified mortars are directly proportional to …
The main goal of the paper is a presentation of structural behaviour and compressive strength of concrete rings strengthened by spraying polyurea coating system.
The factors affecting the properties of the internal HAC mortar lining of ductile CI pipes were investigated. The following optimum conditions were obtained for the highest compressive strength: A water/cement ratio of 0.4, a fineness number of sand of 38 and 0.15% citric acid addition. The effect of adding the latter to cement mortar was …
The mortar compressive strength and the stress-strain curves was determined using cylindrical samples with a height of 100 mm (samples CC). The tensile strength of the mortar was tested on mortar cylinders with a length of 50 mm (samples CT). The samples to double punch testing (sample CD) were cut from cylindrical …
Measurement of the compressive strength showed a reduction of 10 % and 35 % obtained for the LWA-PCM-based mortar and the RHA-PCM-based mortar, respectively. Despite the compressive strength reduction, the material could be used in most construction applications.
The test of the compressive strength of masonry columns with different types of mortars is carried out for modifying the equations. The research is carried out from the perspectives of stress-strain curve, elastic modulus, Poisson's ratio, compressive strength of masonry columns.
The often specified seven-day curing commonly corresponds to approximately 70 percent of the specified compressive strengths. The 70 percent strength level can be reached sooner when concrete cures at higher temperatures or when certain cement/admixture combinations are used.
The compressive strength of test cubes was determined by a standard machine of maximum load of 600 kN applied at a speed of 10 mm/min in conformance with ASTM 109/92 [17].
The present study dealt with the compressive strength, static, and dynamic modulus of elasticity of cement-lime laying mortars that have been widely used over the last decades for construction of structural masonry elements of different types (e.g., concrete, clay, and calcium silicate masonry).
Applicable properties enumerated in this specification will be determined by the following test methods: air content of mortar, chemical analysis, compressive strength, false set, fineness by air permeability, fineness by turbidimeter, heat of hydration, autoclave expansion, time of setting by Gillmore needles, time of setting by Vicat …
The concrete shall be Type I portland cement concrete with 3/4 inch minus coarse aggregate with fiber reinforcement and plasticizer producing a compressive strength of 4,000 psi at full cure.
Relationship between P-wave velocity and compressive strength of mortar lining specimen at each curing time
Both the splitting tensile strength and uniaxial compressive strength decreased after sulfate attack, and the deterioration of the former one was more severe.
This standard describes the material, application, and curing of shop-applied cement–mortar protective linings and coatings for steel water pipe and fittings and field jointing of cement–mortar-lined-and-coated steel water pipe and fittings.
In the present work, the statistical dispersion of the mortar compressive strength as a function of the geometric parameters of the specimens as well as the effect of the mortar workability ...
Compressive Strength of Cement. This test is carried out to determine the compressive strength of cement. Test Procedure for compressive strength of cement: (i) The mortar of cement and sand is prepared. The proportion is 1:3 which means that (X) gm of cement is mixed with 3 (X) gm of sand. (ii) The water is added to the mortar.
This test method covers determination of the compressive strength of hydraulic cement mortar using 50-mm [or 2-in.] cube specimens.
After long-term operation, tunnel lining segments encounter various problems. Aiming at these problems, in this paper, we present a method of strengthening tunnel lining segments by in situ spraying mortar. An experimental study of the in situ spraying mortar was carried out to determine the compressive strength, flexural …
Between 1930 and 1950, gunite/shotcrete gained wide acceptance around the world because, at that time, gunite/shotcrete strength was superior to concrete and permitted the contractor to easily transport a sand cement mixture over …
After the rotational application is complete, the lining is cured to achieve its required compressive strength. Fittings and flanges of any size are lined by hand trowelling, spray gun or combination thereof.
Compressive strength is the most important metric of concrete quality. Various nondestructive and semi-destructive tests can be used to evaluate the compressive strength of concrete. In the present study, a new image-based machine learning method is used to predict concrete compressive strength, including evaluation …
China's drainage pipe trenchless repair standards mainly set requirements for the setting time, compressive and flexural strength, acid resistance, and impermeability of cement mortar materials for spraying ( Table 2 ), and the construction performance requires that the mixed slurry should be suitable for pumping and spraying, …
Topcu [ 9] has examined the physical and mechanical properties of rubberized concretes with initial compressive strength of 20 MPa. The amounts of the rubber used in the rubberized concrete were15%, 30%, and 45% by volume of the total aggregates. This study has concluded that a general reduction in the compressive …
When the concrete lining of a tunnel is exposed to fire, the chemical composition and physical structure change, resulting in a significant reduction in the strength, modulus of elasticity, and ...
Second, the bond strength of ARM made from the optimum mix proportion was compared with that of cement repair mortar (CRM) using a self-design tunnel-lining-crack-treatment platform (TLCTP).
Ren et al. [31] used alternative fuels to design lightweight bauxite-SiC composite refractories as the lining of a rotary cement kiln. Silica sol-coated lightweight mullite-based mullite-SiC bricks could solve the problem of lightweight materials that resist alkali attack and lead to higher compressive strength compared with specimens that ...
