Значение микрокремнезема как активной минеральной добавки в цементах с низким водопотреблением

Аннотация

This article talks about low water requiring cements, which is practiced in scientific laboratories of leading scientific centers and higher educational institutions engaged in the research of mineral binders and materials based on them in the world, reducing the release of carbon dioxide gas into the environment during cement production, the use of local raw materials and industrial waste in cement production, chemical additives and mechanical a lot of scientific and research work is being carried out on the effective use of activation. In this regard, it is important to develop optimal compositions of energy-efficient building materials, low-water-demanding binders that allow the economy of Portland cement clinker in cement production, using local raw materials and man-made waste, as well as surfactants, in the scientific research conducted in this regard. Аннотация. В данной статье говорится о низкой водопотребности цементов, что практикуется в научных лабораториях ведущих научных центров и высших учебных заведениях мира, занимающихся исследованием минеральных вяжущих веществ и материалов на их основе, снижая выбросы углекислого газа в окружающую среду при Производство цемента, использование местного сырья и промышленных отходов в производстве цемента, химических добавок и механических. Ведется большая научно-исследовательская работа по эффективному использованию активации. В связи с этим актуальна разработка оптимальных составов энергоэффективных строительных материалов, маловодотребовательных вяжущих, позволяющих экономить портландцементный клинкер в производстве цемента, используя местное сырье и техногенные отходы, а также поверхностно-активные вещества. , в научных исследованиях, проводимых в этом отношении. Annotatsiya. Ushbu maqolada dunyoning yetakchi ilmiy markazlari va oliy o‘quv yurtlari ilmiy laboratoriyalarida mineral bog‘lovchi moddalar va ular asosidagi materiallarni tadqiq qilish, atrof-muhitga karbonat angidrid gazining chiqishini kamaytirish bilan shug‘ullanuvchi sementlarning kam suv talab etiladiganligi haqida so‘z boradi. sement ishlab chiqarish, sement ishlab chiqarishda mahalliy xomashyo va sanoat chiqindilaridan foydalanish, kimyoviy qo‘shimchalar va mexanika faollashtirishdan samarali foydalanish bo‘yicha ko‘plab ilmiy-tadqiqot ishlari olib borilmoqda. Shu munosabat bilan mahalliy xomashyo va texnogen chiqindilar, shuningdek sirt faol moddalardan foydalangan holda sement ishlab chiqarishda portlend tsement klinkeri tejamkorligini ta'minlash imkonini beruvchi energiya tejamkor qurilish materiallari, suvni kam talab qiluvchi bog'lovchilarning optimal kompozitsiyalarini ishlab chiqish muhim ahamiyatga ega. , bu borada olib borilgan ilmiy tadqiqotlarda. Keywords: microsilica, low water demanding cement, mechanical character. Ключевые слова: микрокремнезем, вяжущие низкое водопотребности, механик характер. Kalit so’zlar: mikrokremnezyom, kam suv talabchan sement, mexanik xarakter. Introduction. One of the most common methods of changing the structure of cement is the introduction of highly active microadditives based on active amorphous oxides, which are included in composites - microsilica, metakaolin, etc. [1, 768-b]. In the initial research work discussed by Kokubu, partial replacement of cement with high quality fly ash was found to give good results.That is, when pure Portland cement was used to obtain the same 28-day strength concrete, when the large aggregates of cement were replaced with fly ash, the water content per unit volume was reduced relative to the volume of concrete. The increase in long-term durability of fly ash concrete is mainly attributed to its smooth, spherical particles, as well as an increase in the proportion of paste. When Uchikawa reviewed the rheological studies of concrete with fly ash, particles of fly ash larger than 45 μm are unsuitable for mixing, but can be used after grinding it in a mill [2, 349 - b]. Methods. A comparative study of microsilica from 18 sources showed significant variations in material composition and properties. One of the microsilicas studied contains 23% SiO2 and a specific surface area of 7500 cm2/g. The same study showed that most glass-derived microsilica accounts for 98-99.5% of the total diffraction intensity and is located at 0.405 nm, which is considered glassy. The most common crystalline substances are KS1, quartz, metal and iron silicide. [2, 364-b]. The influence of rheotechnological parameters such as the type of low water- demanding cements, the amount of constituent components, the specific surface area, water demand on the bond strength is presented in Table 1. Table 1: Mechanical characteristics and compositions of LWDC. t Composition of z e r e l m e n Heat Compressive strength of mat % er ial u p e r pl a st i c i S o f t n e s s l e v M 2 / k g a t e r r e q ui r e R tr c e , a k t g m /s e m nt 2 t n h a e t u sa ra m l p c k l o g e n / s h d m a it r 2 i d o e n n s e , d R i c n , L W D M S W № % ) ) % )