Waterproof Material Research Articles

Experimental study on the properties of a polymer-modified superfine cementitious composite material for waterproofing and plugging

Long-term waterproofing and water leakage treatment of existing underground structures have become prominent issues in the operation and maintenance of underground structures. The use of single organic or inorganic materials for water leakage treatment is not effective for solving practical engineering problems. Considering the properties of organic and inorganic materials, a novel composite material mixing the waterborne epoxy resin and superfine ordinary Portland cement-sulphoaluminate cement was presented, which was studied as a polymer-modified cementitious composite for waterproofing and plugging. This study investigated the primary physical properties of the raw materials of the polymer-modified cementitious composite. Experimental tests were performed to investigate the effects of waterborne epoxy resin on the impermeability, interface adhesion, and tensile deformation performances of the superfine cementitious waterproof material. The results showed that the average water penetration height of the waterborne epoxy resin-modified material was only 52.2% that of the cementitious materials, indicating better impermeability performance. When 3% waterborne epoxy resin was mixed, the bending bond strength of the polymer-modified composite material was 10.6% higher than that of the cementitious material. The direct tensile bond strength of the polymer-modified composite material with various waterborne epoxy resin content significantly improved, demonstrating a maximum increase of 72.6%. Compared with the original cementitious material, the toughness, tensile deformation capacity, and tensile strength of the polymer-modified superfine cementitious composite material were improved. The maximum tensile amount increased by 48.3% when an appropriate amount of waterborne epoxy resin was mixed, which is the primary performance in long-term waterproofing. Moreover, the bearing capacity increased by 335.2% compared with the cementitious materials when 7% waterborne epoxy resin was mixed. The key contribution of this research is to propose a high performance and effective polymer-modified composite material for the treatment of waterproofing and plugging. The findings from the study also provide industry practitioners with a comprehensive guide regarding the mechanical and impermeability performances of the polymer-modified superfine cementitious composite material.

ISLA DE CALOR Y SU INTENSIFICACIÓN EN LA VIVIENDA PERIFÉRICA DE MÉRIDA HEAT ISLAND AND ITS INTENSIFICATION IN THE PERIPHERAL HOUSING OF MÉRIDA

Extreme temperatures and heat waves trigger considerable problems to the population and the environment, making the inhabitants of urban areas the most vulnerable to this situation. The impacts generated are identified from a general increase in the demand for water and energy, health problems and greater air pollution. In this sense, the influence that cities have on their own climate has long been recognized, which is typically hotter than its nonurban surroundings, this phenomenon is called Urban Heat Island (ICU), and its main causes are due to the urbanization process. One of the mitigation measures is the increase in intraurban vegetation areas; You are filtering the wind currents, decrease the air temperature through evapotranspiration and intercept solar radiation before being absorbed by the waterproof materials of the city. This work explores the intensification of the UHI in the city of Mérida, Yucatán. Its objective is to determine the thermal behavior of the housing areas on the periphery of the city and conurbation. On the one hand, the results obtained show the convenience of the methods used to characterize the problem, on the other, they reveal that the housing sectors located on the periphery have temperature patterns that range between 47 and 55 degrees Celsius. The above reflects the need to establish land use policies and housing development, contributing to the process of adaptation to climate change.

Investigation of Basic Characteristics of Waterproof-Breathable Nonwoven Nano-Fabric Manufactured by Improved Melt-Blowing Method

In recent years, materials with both waterproof and breathability have also been marked with the eye-catching slogan of "waterproof-breathable" on the commodity such as personal protective equipment or sportswear. Regarding the application of nanofiber non-woven fabric as waterproof and breathable materials for functional textile, although there are previous reports regarding conventional micro-fabrics, the relationship between the compositions of the fiber aggregate, waterproof and breathable properties remain unclear regarding nanofabrics. Therefore, this study shows investigation of influence of fiber diameter, bulk density and thickness of the woven nanofabric on waterproof-breathable ability with experiment and CFD (computational fluid dynamics) model. As a result, the average fiber diameters, bulk densities, and thicknesses to achieve waterproofness and air permeability were numerically obtained respectively. From the results, it can be found that, these parameters can be used as a reference for manufacturing high-performance waterproof permeable materials with both high waterproofness and high air permeability.

Experimental study on waterproof performance of assembled station joints of Shenzhen Rail Transit Line

With the development of underground prefabricated building structure, the influence of waterproof performance on underground engineering construction is becoming more and more important. Based on the analysis of the current situation of waterproof technology of prefabricated subway station joints, this paper conducts similar experiments on the waterproof mechanism and construction characteristics of the water-swelling rubber water-stop selected at the joint, and analyzes the waterproof performance of the assembly joint and the overall performance of the structure. It lays the foundation for the selection of waterproof materials, structural size optimization and opening design of the prefabricated subway station structure, and analyzes the waterproof performance of the rubber water-stop. In order to grasp and record the overall stability and waterproof performance of the assembled subway station structure in time, on the basis of field investigation, the model joint specimens of the assembled subway station joints were made according to the similar theoretical model experiment, and the joints of the assembled subway station joints were watered. The internal seepage, development and deformation convergence of the specimen structure were monitored in real time. The monitoring results will provide data support for the operation safety of the assembled subway station.

In-situ grown SiO2 on amino-silane modified polyacrylonitrile nanofibrous membranes and its waterproof-breathable and light-shielding properties

Waterproof and breathable (W&B) materials with light-shielding properties are expected to provide new choices for outdoor clothing. Herein, SiO2@PAN nanofibrous membranes were fabricated by a facile and eco-friendly strategy. Firstly, amino-silane modified polyacrylonitrile (PAN-APS) nanofibrous membranes were prepared by electrospinning. Subsequently, a hierarchical rough structure and robust superhydrophobic surface were formed by a one-step in-situ growing SiO2 and coating with hexadecyltrimethoxysilane (HDTMS). The results showed that SiO2@PAN nanofibrous membranes displayed durable water repellency (the water contact angle above 150° and the sliding angle of about 5.3°), and high breathability (the air permeability of 47.23 mm/s and the moisture permeability of 3.92 kg·m−2·d-1). And SiO2@PAN nanofibrous membranes had a certain durability, which water repellency could maintain even after mechanical abrasion, or after 24 h of immersion in acid-base solutions with pH values of 1, 4, 7, 10 and 13. Moreover, SiO2@PAN nanofibrous membranes showed light-shielding properties. After 10 min exposure to sunlight irradiation, the surface temperature of SiO2@PAN membrane was about 10 °C lower than that of PAN membrane and 20 °C lower than the temperature of the surface without covering membrane. This work provides a promising candidate for protective clothing.

The results of laboratory studies on the composition for roofing and waterproofing mastics

The results of laboratory studies on the composition for roofing and waterproofing mastics

FORMULATION DEVELOPMENT OF A NEW BITUMINOUS BUILDING COMPOUND

The paper presents the results of comparative tests of physical and mechanical properties of experimental samples of construction bitumen composition in laboratory conditions. It is concluded that the experimental sample No11, obtained according to the formulation developed by the author, in comparison with other samples, allows to obtain a high-quality constructionbitumen composition. The developed construction bitumen composition is recommended to be used as a waterproofing material as a coating of foundations and building structures.

STUDY OF WATER INFLUENCE ON WATERPROOFING MATERIAL "POLYISOL-M"

The paper presents the results of experiments to study the properties of water absorption and water resistance of the waterproofing material "Polyisol-M". As a result of experimental analysis the water absorption capacity of the waterproofing material "Polyisol-M" with thickness of 5 mm was 0,59 %, and the value of mass loss was 2,42 %, therefore it was recommended to use it in production.

STUDY OF PHYSICAL AND MECHANICAL PROPERTIES OF PETROLEUM BITUMEN

The article presents the results of scientific research on the use of bitumen compositions developed on the basis of raw materials and wastes of domestic oil, gas and petroleum industry in the production of new types of construction waterproofing materials, as well as on the determination of their physical-mechanical and operational properties.

Research and Development of Self-Waterproofing Concrete for Tunnel Lining Structure and Its Impermeability and Crack Resistance Characteristics.

This research paper systematically investigates the combined influence of fly ash, cementitious capillary crystalline waterproofing (CCCW) materials, and polypropylene fibers on the mechanical properties and impermeability of concrete through comprehensive orthogonal tests. Microscopic morphological changes in the concrete induced by different composite materials are examined via scanning electron microscopy (SEM) and X-ray diffraction (XRD) testing. The objective is to facilitate a beneficial synergetic interaction among these materials to develop highly permeable, crack-resistant concrete. Key findings of this study are: (1) The study unveils the impact of the concentration of three additive materials on the concrete's compressive strength, tensile strength, and penetration height, thereby outlining their significant influence on the mechanical properties and impermeability of the concrete; (2) An integrated scoring method determined the optimal composite dosage of three materials: 15% fly ash, 2% CCCW, and polypropylene fibers at 1.5 kg/m3. This combination increased the concrete's compressive strength by 12.5%, tensile strength by 48.4%, and decreased the average permeability height by 63.6%; (3) The collective introduction of these three materials notably augments the hydration reaction of the cement, resulting in denser concrete microstructure, enhanced bonding between fibers and matrix, and improved concrete strength and durability.

Study on improvement of waterproofing performance of CCCW with silicone waterproof material and waterbased capillary inorganic waterproofer

The silicone waterproof material and waterbased capillary inorganic waterproofer possess the advantages of rapid film formation and significant hydrophobic effect. In this study, the material composition and mixing ratio of the silicone waterproofing material and waterbased capillary inorganic waterproofing were investigated by multiple performance tests. The results indicated that a white coating was formed on the surface when the mixing ratio of isobutyl-triethoxy-silane and isooctyl-triethoxy-silane was more than 69 %. When the content of sodium and potassium methyl silicate exceeded 0.5 %, respectively, there was an upward trend of contact angle while the reduction in water absorption gradually decreased. Meanwhile, the contact angle and water absorption height of silicone waterproof material were tested. The results showed that the coating performance and hydrophobicity were the best when the mixing ratio of isobutyl-triethoxy-silane, isooctyl-triethoxy-silane, sodium methyl silicate, and potassium methyl silicate was 1.5:0.2:1:0.5. When the matrix mortar specimen was made of Cementitious Capillary Crystalline Waterproofing Materials (CCCW), the lowest water absorption height and water absorption of the experimental group consisted of sodium silicate, sodium tetraborate, sodium phosphate, and sodium hydroxyethyl cellulose were 316.7 % and 39%, respectively. The lowest water absorption height and water absorption of the experimental group consisted of sodium silicate, sodium tetraborate, nano-silica, and sodium hydroxyethyl cellulose were 215.4 % and 28 %, respectively. The results showed that CCCW combined with the experimental group consisted of sodium silicate, sodium tetraborate, sodium phosphate, and sodium hydroxyethyl cellulose had better waterproofing effect.

A Study of the Field Test Method for the Adhesive Performance Evaluation of Self-Adhesive Waterproofing Sheets

In the field of waterproofing concrete structures, the use of self-adhesive waterproofing sheets has become a popular technique for ensuring long-term waterproofing performance. One important characteristic of such sheet materials is maintaining their stable adhesion strength over an extended period. Adhesion testing serves as a crucial method for assessing the long-term adhesion performance. However, a standardized test method, including equipment and criteria, for directly measuring the adhesion strength of waterproofing sheets applied to onsite concrete walls has not yet been established. Therefore, reliance on laboratory evaluation results has been the only option thus far. In this study, a field-applicable adhesion measurement device was developed in an effort to provide a quality control method for self-adhesive waterproofing sheets and to demonstrate the validity of a standardized evaluation method utilizing this device. The developed adhesion measurement device was designed based on the principle of the peel-out test in compliance with the requirements outlined KS F 4934, where the test specimen backing plate can slide into a 1:1 ratio at the same distance as the rise of the tension jig when the tension jig is raised at a 45° angle. By utilizing this device, the adhesion strength values of self-adhesive waterproofing materials applied in the field were compared with those obtained using a laboratory universal testing machine (Salem, MA, USA) (UTM) on the test specimens. Comparative analysis yielded that the standard deviation of the results varied for the tested waterproofing materials, and the overall standard deviation for the UTM measurements was 0.17, while it was 0.18 for the portable field measurement equipment. The results of the comparison indicated that when limited to the scope of the KS measurement method specifications, the possibility for a wider scope of usage can be made possible with more data and studies.

QUALITY OF LIFE OF A PATIENT WITH PERSISTENT COMPLICATIONS AFTER SARS-COV-2 INFECTION REQUIRING URGENT SURGICAL INTERVENTION – ENDARTERECTOMY WITH EMERGENCY ANGIOPLASTY OF AN INFLAMED, BLEEDING RIGHT INTERNAL CAROTIDARTERY (RICA) USING THE TRANS-CAROTID ARTERY REVASCULARIZATION(TCAR)

SUMMARY The purpose of this study was to determine the quality of life of a patient with persistent complications of SARS-CoV-2 infection requiring urgens surgical intervention – endarterectomy with emergency angioplasty of an inflamed, bleeding Right Internal Carotid Artery (RICA) by direct access via Right Common Carotid Artery (RCCA), known as Transcarotid Artery Revascularization (TCAR).A patient in her 60s was infected with the SARS-CoV-2 virus and contracted COVID-19 in March 2022, as confirmed by RT PCR antigen test. The infection was followed by short- and long-term complications, many of which can be linked to COVID. These include significant weakness persisting for months after the illness, rapid weight loss of 25 kg, sleep disturbances, chronic fatigue, severe dizziness, onset of diabetes, decrease dimmunity with increased periodontal inflammation (including formation of a periapical abscess of a molar tooth) and secondary suppuration of the submandibular lymphnodes, one of which lying jacent to the right internal carotidartery (RICA). This accumulation of symptoms led the patient to seek medical and neuropsychological help. Test ingusing the Beck Depression Inventory (BDI) confirmed depression, with vegetative disorders being the most predominant. Eight months after undergoing COVID-19, the patient suffered a Transient Ischemic Attack (TIA). The accumulation of diseases (diabetes mellitus, stage III hypertension and TIA) had a dramatic impact on the patient's health, including life-threatening conditions.A vascular surgeon consulted the patient advised immediate surgical treatment: carotid endarterectomy. The urgency of the situation was exacerbated by bleeding during the operation from the operated, secondarily inflamed wall of the RICA (lying adjacent to the suppurated submandibular node).This prompted an emergency decision for an endovascular procedure: the implantation of a stent covered with water-proof material (peripheral stent graft). This was made by a direct access via puncture of the common carotid artery (RCCA) below the endarterectomy level (TCAR).The SF-36 questionnaire was chosen to measure health-related quality of life (HRQOL).The SF-36 results are presented in such a way that higher scores correspond to fewer complaints, indicating better health and higher quality of life. Before revascularization, the patient's HRQOL was found to be lower, which was related to the negative impact of long COVID, while after the procedure, the quality of life gradually improved in subsequent surveys. A significant difference was found in physical function, with a mean score of 66.0 (p<0.001) compared to a score of 94.9 (9.4) for 100 age-matched health subjects. A similar result was found in the physical role (p < 0.001). The patient's overall quality of life score was 331.0 compared to a score of 578.0 (111.9) for age-matched normal healthy people.Better quality of life in patients with long COVID is an important therapeutic goal that can be achieved through comprehensive, multispecialty treatment for both physical and psychological conditions.

Service Life Prediction of Concrete Coated with Surface Protection Materials by Ultrasonic Velocity in Cold Region

Lithium silicate (LS) crack repairing material, working as a crystal waterproof material, could be used to strengthen concrete made from solid waste materials. This paper presents the results of water absorption and rapid freeze–thaw tests with concrete specimens coated with LS. Concrete specimens with different water–binder ratios and air content (0.35–1 and 0.55–4.5) were tested. The moisture uptake and water absorption coefficient were analyzed in the water absorption test. The water absorption coefficient of LS-coated specimens was lower than that of uncoated specimens, resulting in a lower total moisture content. The relative dynamic modulus of elasticity was calculated by the fundamental transverse frequency (Er) and ultrasonic velocity (Ev), respectively. Er and Ev exhibited similar attenuation characteristics, and the attenuation of LS-coated specimens was lower than that of uncoated specimens. A two-segment freeze–thaw damage model based on Er and Ev was employed to predict the service life of concrete. The relative errors of the service life results calculated by Er and Ev were within 10%. The two-segment freeze–thaw model could be used for the service life prediction of concrete structures. The present work provides new insight into using LS to improve the service life of concrete.

Evaluation of Uncertainty in Determination of Soluble Content of Plastic Body Modified Asphalt Waterproof Coil

Plastic body modified asphalt waterproof rolling material should be tested for soluble substance content in accordance with the provisions of 5.3 Material performance clause in GB 18243-2008 Plastic Body Modified Asphalt Waterproof Rolling Material, and the corresponding minimum soluble substance content requirements are given according to the type and thickness of the rolling material. Soluble substance content detection shall be conducted according to the method specified in GB/T 328.26-2007 Test Method for Building Waterproof Roll Part 26 Soluble Substance Content of Asphalt Waterproof Roll (impregnated Material Content). In this assessment, the soluble matter content of APP I PY M PE 3 10 products produced by an enterprise was determined according to the corresponding standards, and the measurement uncertainty of this test was assessed according to the test process and results. The results were calculated as follows: The relative standard uncertainty of soluble content of the plastic body modified asphalt waterproof coil is μ= 34.42g/m2, and the extended uncertainty is U=(2482 ± 69) g/m2. The data is taken as an integer according to the standard, so the extended part certainty is 69g/m2. It can be seen from the process of evaluating measurement uncertainty that its main source is the introduction of weighing mass before and after specimen individual differences.

Study of work of PVC membranes for engineering waterproofing under increased seismic conditions

Objective. At present, increased requirements are imposed on waterproofing materials used in seismic hazard zones. The aim of the study is to assess the possibility of using LOGICBASE™ polymer membranes in regions of increased seismic activity in the Russian Federation.Method. The mechanism of operation of polymeric membranes in foundation structures under conditions of constant displacement and friction is considered. Experiments were carried out to determine the coefficient of friction according to the method of state standards on a tensile testing machine MIRK-1000K. Samples of a round shape made of polymeric membranes were studied on a special multiaxial stretching device in accordance with the requirements of state standards.Result. Multiaxial tensile testing of LOGICBASE™ V-SL polymeric membranes revealed that the maximum tensile strength of the samples was 6948.22 kPa (~ 6.95 MPa), and the elongation of the samples at break was 113.89%. The coefficient of friction in the system "polymer waterproofing material - concrete structure" was determined under conditions of increased seismic activity according to the MSK-64 scale.Conclusion. According to the studies, it was concluded that PVC membranes for engineering waterproofing can be used in construction areas with seismicity up to 9 points inclusive on the MSK-64 scale.

Paper packaging materials: modeling and optimization of hydrooleophobic composition

Introduction. A high level of barrier and protective properties, resistance to moisture penetration (water, steam) and air resistance are the main requirements for packaging paper for food products. Problem. Polyvinyl alcohol-based polymer coatings are widely used for packaging paper; however, such coatings tend to have poor water resistance due to the hydrophilic and water-soluble nature of polyvinyl alcohol. Polyamide-epichlorohydrin resins are used to provide mois­ture resistance of the paper, and glycerol is used for the elasticity of the coating. At the same time, the complex effect of these components in the mixture for surface treatment of paper on the quality of the products has not been sufficiently investigated. Methods. Compositions based on aqueous solutions of polyvinyl alcohol brand 7/18 of the highest grade, polyamideamineepichlorhydrin EKA WS 325 and glycerol brand PK-94 were used to obtain a moisture-resistant, waterproof and fat-proof packaging material. Polyacryla­mide in the amount of 0.25 wt. % was used as a func­tional additive, a viscosity regulator of the com­position, and water was used as a solvent. Model compositions with different ratios of the main components in accordance with the central com­posite rotatable plan of the experiment were app­lied to the tests according to the methods adopted in the pulp and paper industry. STAT-SENS software was used for mathematical processing of the experimental results. A multi-criteria opti­mization method was used to find the optimal range of parameters of the hydrooleophobic composition. Results. The 15 model compositions have been developed. The influencing factors were the content of the polyvinyl alcohol, polyami­deamineepichlorhydrin, glycerol. The quality indi­cators of the treated paper-base were selected as the response functions of mathematical models: oil permeability, air permeability, destructive force, moisture resistance, surface absorption. Conclusions. The developed composition is optimal and makes it possible not to exceed its consumption during application to fibrous mate­rial, in particular paper. The composition pene­trates the thickness of the paper to an optimal depth evenly over the entire surface of the paper, which makes it possible to provide the paper with uniform barrier properties, mechanical strength and wet-strength along the plane of the canvas. In addition, glycerol gives elasticity to the resulting coating and prevents it from cra­cking during repeated bending.

Mitigation of alkali silica reactions in concrete using multi-crystalline intermixed waterproofing materials

Concrete deterioration by Alkali Silica Reactions (ASR) is a severe issue of concrete durability associated with porosity and permeability. Most of the industrial solutions for mitigating ASR rely on controlling the mix design by mineral admixtures or lithium compounds. An innovative approach for mitigating ASR through a secondary role of crystalline waterproofing materials is presented. An aqueous solution of Multi-Crystallization Enhancer (MCE) is intermixed with water or added to the concrete mixture, at a dosage of 2% by weight of cement, then upon curing reduces the permeability under pressure by more than 99%. This study shows that ASR mitigation can be accomplished by incorporating the MCE in the fresh concrete mixture or by prewetting the aggregates. The experiments were made according to the methods of ASTM C1260. The investigated independent experimental variables included water to cement ratio, types of aggregates, method of the MCE addition, and time. The MCE can change the performance of aggregates from reactive to be equivalent to non-reactive. The findings demonstrate that the length expansion from ASR increases with increasing the w/c ratio for all types of aggregates attributed to the increase in the permeability. The MCE addition to mixtures with reactive aggregates enhances the resistivity against ASR by a percentage in the range of 45%-77%. The functionality of the MCE in mitigating the ASR is also confirmed using concrete specimens with long term ASR testing (ASTM C1293).

FATIGUE RESISTANCE OF TOPCOAT OF THE POLYURETHANE WATERPROOFING MEMBRANE

A topcoat is applied to the surface of a polyurethane waterproofing membrane in order to enhance weather resistance. In actual buildings, a crack generated in the topcoat induces a crack in the waterproof material below the topcoat. Therefore, in this study, the fatigue resistance was verified focusing on the crack of the top coat using two kinds of fatigue test methods. As a result, it was shown that the number of repetitions until the crack was generated in the top coat could be explained by the maximum elongation rate of the top coat.

Investigating the Feasibility of Using Concrete Containing Waste Paper Sludge Ash and Pozzolanic Materials to Repair Bridge Stub Columns

In most cases, the bridge columns are underwater, and there is a risk of corrosion. The columns of marine structures and docks also include such problems. In addition to the problem of environmental hazards, the bridge columns may fail due to design problems or increasing needs. The use of waterproof concrete materials as a jacket can have a role in increasing the life of bridges. Studies in recent years show that some waste from paper industries can be used in the construction industry. In the present study, several concrete stub columns were built as bridge columns and retrofitted with concrete jackets containing waste paper sludge ash, silica nanoparticles, aluminium oxide nanoparticles, and acrylic resin. The variables included the geometric shape of the column (square and circular) and the type of nanoparticles used in the jackets (silica and aluminium oxide nanoparticles), and the curing environment of the columns (normal and sulfate environments). The combined use of nanomaterials and waste paper ash is the most important novelty of the present study. The axial loading test was performed on the columns, and the load-deflection diagrams were obtained. The ductility, stiffness, load-bearing capacity, and crack distribution were among the parameters that were used to compare different modes. The proposed jackets increased the carrying capacity by 10 to 38%, depending on the processing curing environment and the type of nanoparticles. The combined use of aluminium oxide nanoparticles and waste paper ash can improve compressive, tensile, and flexural strengths and increase the axial load capacity of bridge columns. The proposed concrete jacket effectively reduces the corrosion of concrete and steel reinforcement and improves the bridge’s useful life.