SU631483A1 - Surface-active additive to cement - Google Patents

Description

This invention relates to a process for the production of building materials, in particular, to additives for cement. Compositions of surface active additives to cement are known, including technical or enrichment ligno sulfonates ij. Closest to the inventive in composition and effect achieved is a surfactant additive comprising 1-2 weight, h, lignosulfonate, 1 weight, h, calcium acetate and 0/25% triethanolamine by weight of the first two 2. A disadvantage of the known surface-active additives is the low plasticizing ability and adverse negative effects, such as shortening the setting time, fast and false setting, the aim of the invention is to control the grain size distribution of the cement and the high plasticity of the cement mortar. The goal is achieved by the fact that. surface-act1 noQ & BKaf, including lignosulfonates and an amino-containing substance, contains ammonia-rich fatty acids as an amino-containing material; amines of the aromatic series or derivatives of amines and a rum t 1–14 of its number in the following ratio of components B, weight, h: Liginos ulftot u (in terms of dry substance) 5–25 AM and most of all 8 e substance1. The additive is obtained by mixing the lignosulfonates with, it should be introduced into the cement when O is sprayed, O amount, -025-0.25% by weight of the cement. The essence of the invention is as follows. Formed during the hydration of cement containing lignosulfonates, poorly soluble lignosulfonate –Ca complexes (, virtually eliminate for some time the protective film of surfactant on the initial cement particles, which leads to rapid crystallization of calcium hydroaluminate and Ca (OH) 2 in capillaries space in order to shorten the setting time and

When adding basicity amines to lignosulfonates, the sulfo groups of lignosulfonates are coordinated along a lone pair of nitrogen electrons in amines. This leads to a weakening of the ability of lignosulfonates to interact with Ca (OHl2) and reduces the possibility of their complex formation, which, in turn, helps to eliminate the anomalous effect of lignosulfonates on the setting time of cement. At the same time, the additive, including lignosulfonates and an amine-containing substance, contributes to the formation of a homogeneous granulometric composition of cement with a higher content of particles of 5-30 microns in size and has a catalytic effect on

the processes of hydration and hardening, which ensures the required increase in strength and allows us to overcome the retarding effect of lignosulfonates. Effect of additive on setting time, ductility and cement strength

compositions are shown in Table. 1. The effect of a surfactant additive on the granulometric composition of cement (Sebroff cement clinker) S -3000 cm / g ± 100 is shown in

tabl, 2.

The use of the proposed additive reduces the labor intensity of concrete work, reduces the consumption of cement by 1 m of concrete, and improves the construction and technical properties of plasticized cement and concrete.

table 2

lignosulfonates2

calcium acetate

triethanolamine 10% by weight of the first two components

lignosulfonates10

nonylamine 1

lignosulfonates: 25

Claims (2)

quinolin.1. The surface-active additive to cement, including lignosulfonates and amine-containing substances, is characterized in that, in order to control the granulometric composition of the cement and increase the plasticity of the cement slurry, it contains amides of amine-containing amines of a fatty variety of aromatic p yes or aromatic derivatives 42.0 25.5 17.3 15.2 40.0 23.8 15.3 20.9 42.4 22.8 16.6 18.6 25 30 35 r yes in the following ratio of components, weight. including: lignosulfonates (in terms of dry substance) 5-25 Amino substance1. Sources of information taken into account in the examination: 1. Chekhov Yu. V. Reducing the permeability of concrete, M., Energie, 1968, p. 79. 2. US patent number 3094425, CL. 10960, 1963,