混凝土外加劑的作用/The role of concrete admixtures

混凝土外加劑是指為改善和調節混凝土的性能而摻加的物質。混凝土外加劑在工程中的應用越來越受到重視，外加劑的添加對改善混凝土的性能起到一定的作用，新密市新海洋新型建材有限公司是一家專業提供混凝土外加劑產品的服務平臺，集研發、生產、銷售為一體的股份制企業。河南混凝土添加劑，減水劑外加劑就找新密市新海洋建材。

一、按主要功能分類

(1) 改善混凝土拌合物流變性能的外加劑，包括普通減水劑、高效減水劑、早強減水劑、緩凝減水劑、

緩凝高效減水劑、引氣劑、引氣減水劑和泵送劑等。

(2) 調節混凝土凝結時間、硬化性能的外加劑，包括緩凝劑、緩凝減水劑、緩凝高效減水劑、早強劑、

早強減水劑和速凝劑等。

(3) 改善混凝土耐久性的外加劑，包括引氣劑、引氣減水劑、防水劑和阻銹劑、礦物外加劑等。

(4) 改善混凝土其他性能的外加劑，包括防凍劑、膨脹劑、養護劑、著色劑、水下澆筑混凝土抗分散劑、

砂漿外加劑、脫模劑、混凝土表面緩凝劑、混凝土界面處理劑、大摻量摻合料專用混凝土外加劑等。

Concrete admixtures are substances added to improve and regulate the properties of concrete. The application of concrete admixtures in engineering has been paid more and more attention, the addition of admixtures plays a certain role in improving the performance of concrete, Xinmi New ocean New building Materials Co., Ltd. is a professional service platform to provide concrete admixtures, research and development, production and sales as one of the joint-stock enterprises. Henan concrete additives, water reducing agent admixtures to find Xinmi new Marine building materials. xhyjc.cn

First, according to the main function classification

(1) Additives to improve the variable performance of concrete mixing, including ordinary water reducing agent, high efficiency water reducing agent, early strength water reducing agent, slow setting water reducing agent,

Retarding superplasticizer, air entrained agent, air entrained water reducing agent and pumping agent, etc.

(2) admixtures that adjust the setting time and hardening properties of concrete, including retarding agents, retarding water reducing agents, retarding high efficiency water reducing agents, early strength agents,

Early strength water reducer and accelerator, etc.

(3) Admixtures to improve the durability of concrete, including air entraining agent, air entraining water reducing agent, water preventing agent and rust inhibitor, mineral admixtures, etc.

(4) Admixtures to improve other properties of concrete, including antifreeze, expansion agent, curing agent, coloring agent, anti-dispersant agent for underwater pouring concrete,

Mortar admixture, release agent, concrete surface retarder, concrete interface treatment agent, special concrete admixture for large amount of admixture, etc.

二、混凝土外加劑的種類及作用

(1) 普通減水劑:混凝土坍落度基本相同的條件下，能減少拌合用水量。 

(2) 高效減水劑:混凝土坍落度基本相同的條件下,能大幅減少拌合用水量，或在用水量相同的條件下，能大幅提高混凝

土流動性的外加劑。

(3) 早強減水劑:兼有早強和減水功能。

(4) 緩凝減水劑:有緩凝和減水功能。

(5) 緩凝高效減水劑：兼有緩凝和大幅減少的功能。

(6) 引氣減水劑:兼有引氣和減水功能。

(7) 防水劑:能提高水泥砂漿、混凝土抗滲性能，降低混凝土在靜水壓力下的透水性。

(8) 膨脹劑:使混凝土產生一定體積膨脹。

(9) 防凍劑:使混凝土在負溫下硬化，并在規定時間內達到足夠防凍、強度。

2. Types and functions of concrete admixtures

(1) Ordinary water reducing agent: under the condition that the slump of concrete is basically the same, it can reduce the water consumption of mixing.

(2) High efficiency water reducing agent: under the condition that the slump of concrete is basically the same, it can greatly reduce the water consumption of mixing, or under the condition of the same water consumption, it can greatly improve coagulation

Admixtures for soil fluidity.

(3) Early strength water reducer: both early strength and water reduction functions.

(4) retarding and water reducing agent: has retarding and water reducing function.

(5) retarding high efficiency water reducing agent: both retarding and greatly reducing the function.

(6) air and water reducing agent: both air and water reducing functions.

(7) waterproofing agent: it can improve the impermeability of cement mortar and concrete and reduce the water permeability of concrete under hydrostatic pressure.

(8) Expansion agent: the concrete produces a certain volume expansion.

(9) Antifreeze: make the concrete harden at negative temperature, and achieve sufficient antifreeze and strength within the specified time.