In this paper,the unreasonableness in the determination of the amount of blended concrete antifreezing agent has been pointed out,and throughout the study,the scheme of determination of the amount of blended concrete antifreezing agent by taking the concrete desigh strength and curing conditions as the main parameters is also pro- posed.

Establishment and application of the rapid strength formula used antifreeze test;

Discussion on use of antifreeze;

Concrete antifreeze s selection in winter construction;

71 mmol/L+Sodium citrate 67 mmol/L+Yelk 20% +Glycerin 4%),2 types of cryoprotectants(glycerin 4%,DMSO 15%) and difference balance times(30,60,120,180 min) were studied respectively.

The effect of cryoprotectant being removed on the survival rate of frozen thawed day 7 8 bovine blastocysts produced in vitro was investigated.

The recipe of antifreezer was 70% antifreezer Ⅰ and 30% antifreezer Ⅱ.

In order to screen antifreezer of peracetic acid used at low temperature, carrier quantitative germicidal test was used to examine the influence of different antifreezers on germicidal action.

The ice-liquid curve in phase diagram of the antifreezer solution and its formula are deduced from measured value of freezing point.

In order to study the early age behavior at minus temperature of concrete,the research for ordinary concrete specimens,including 2% LJ115 liquid anti-freezing mixture specimens,takes early age frost experiment on them,measures compression strength of the specimens that were at different negative temperature curing condition.

In order to study the durability of concrete resistance to freezing this test of freezing and thawing cycle were conducted to ordinary concrete specimens,and concrete spcimens include 2% and 4% anti-freezing mixture respectively by slow freezing method.