The regularities of the synthesis of calcium hydrosilicates of tobermorite composition in the system "amorphous silica – calcium hydroxide – water" were investigated. The effect of calcium hydrosilicates additive on the hydration processes of Portland cement and the nature of changes in the strength of cement stone at different stages of its hardening was studied.
The article presents the results of studies of the influence of technological factors (clinker factor of cements, grain composition of aggregates, cement consumption in concrete, modifier additives) on technical and environmental indicators of concrete efficiency. It has been shown that in combination, the parameters of clinker and CO2 intensities characterize the clinker efficiency of concrete, which can be improved by replacing part of the clinker in mixed cements with active mineral additives.
Nowadays conventional binding material for the construction sector is Portland cement. Portland cement consists mainly of high-energy intensive with a significant carbon footprint Portland cement clinker. Reduction of clinker content in binding materials becomes the utmost priority for scientists in the field, it is reflected in manufacturers’ Sustainability Road Maps.
Стаття містить матеріали досліджень щодо вирішення проблеми утилізації відходів фосфогіпсу через його використання в шарах основи дорожньої конструкції. З цією метою були приготовані композиційні суміші на основі сирого відвального фосфогіпсу. Склад композиційних сумішей оптимізовано таким чином, щоб вміст фосфогіпсу був максимальним. Фосфогіпс стабілізували доменним гранульованим шлаком і портландцементом.
The influence of vibro-activated lime additive on the hydration processes of Portland cement and the nature of changes in the strength of cement stone at different stages of its hardening were studied. It was established that long-term storage of vibro-activated lime in a wet state does not weaken its properties as a modifying additive.
This article describes the classification of cationic bitumen emulsions according to "reactivity" and breaking behaviour characteristics. The methods of researching the characteristics of breaking behaviour for bitumen emulsions of different "reactivity" in accordance with European and Ukrainian regulatory documents are presented. Available possible emulsifiers in Ukraine for over-stabilised bitumen emulsions are given with a description of road technology where they can be applied.
The article presents the peculiarities of obtaining superplasticized cementitious systems "Portland cement – fly ash - superplasticizer" to find a rational provision of the given construction and technical properties of concrete. It was studied the physico-chemical peculiarities of the hydration processes of superplasticized cementitious systems. There were solved problems of directional formation of the microstructure of cement stone.
The article considers the possibility of using wastepaper sludge ash (WSA) as a soil reinforcement material for the construction of layers of road wear. Loamy sand, sandy loam, silty clay loam, silty clay were chosen as soils for strengthening. The maximum density of the soil skeleton at optimum humidity was established by the method of Proctor. Wastepaper sludge ash and Portland cement grade 400 were used separately for soil strengthening.
Показано, що регулювання процесів гідратації на наноструктурному рівні внаслідок адсорбційного модифікування продуктів гідратації полікарбоксилатом та введення нанорозмірних C S H-частинок сприяє однорідному розподілу твердої фази в структурі цементного каменю на мікро- та нанорівнях, збільшенню кількості контактів між гідратами, забезпечує швидке формування структури та синтез міцності портландцементної системи.
Production of Portland cement is one of the most energy intensive among building materials, it is accompanied by significant CO2 emissions: 0,7 to 1 ton per 1 ton of cement, depending on manufacturing technology. Therefore, replacement of Portland cement clinker with active mineral additives of natural or synthetic origin is environmentally and economically viable, while not causing significant adverse changes in the properties of cement binders.